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YouCompleteMe/cpp/BoostParts/boost/thread/future.hpp
Strahinja Val Markovic 0a46a6ec12 Updating to Boost 1.53
2013-02-16 12:25:28 -08:00

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// (C) Copyright 2008-10 Anthony Williams
// (C) Copyright 2011-2012 Vicente J. Botet Escriba
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_THREAD_FUTURE_HPP
#define BOOST_THREAD_FUTURE_HPP
#include <boost/thread/detail/config.hpp>
// boost::thread::future requires exception handling
// due to boost::exception::exception_ptr dependency
#ifndef BOOST_NO_EXCEPTIONS
//#include <boost/thread/detail/log.hpp>
#include <boost/detail/scoped_enum_emulation.hpp>
#include <stdexcept>
#include <boost/thread/detail/move.hpp>
#include <boost/thread/detail/async_func.hpp>
#include <boost/thread/thread_time.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/thread/condition_variable.hpp>
#include <boost/thread/lock_algorithms.hpp>
#include <boost/thread/lock_types.hpp>
#include <boost/exception_ptr.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/scoped_ptr.hpp>
#include <boost/type_traits/is_fundamental.hpp>
#include <boost/thread/detail/is_convertible.hpp>
#include <boost/type_traits/remove_reference.hpp>
#include <boost/type_traits/remove_cv.hpp>
#include <boost/mpl/if.hpp>
#include <boost/config.hpp>
#include <boost/throw_exception.hpp>
#include <algorithm>
#include <boost/function.hpp>
#include <boost/bind.hpp>
#include <boost/ref.hpp>
#include <boost/scoped_array.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <boost/utility/enable_if.hpp>
#include <list>
#include <boost/next_prior.hpp>
#include <vector>
#include <boost/thread/future_error_code.hpp>
#ifdef BOOST_THREAD_USES_CHRONO
#include <boost/chrono/system_clocks.hpp>
#endif
#if defined BOOST_THREAD_PROVIDES_FUTURE_CTOR_ALLOCATORS
#include <boost/thread/detail/memory.hpp>
#endif
#include <boost/utility/result_of.hpp>
#include <boost/thread/thread.hpp>
#if defined BOOST_THREAD_PROVIDES_FUTURE
#define BOOST_THREAD_FUTURE future
#else
#define BOOST_THREAD_FUTURE unique_future
#endif
namespace boost
{
//enum class launch
BOOST_SCOPED_ENUM_DECLARE_BEGIN(launch)
{
none = 0,
async = 1,
deferred = 2,
any = async | deferred
}
BOOST_SCOPED_ENUM_DECLARE_END(launch)
//enum class future_status
BOOST_SCOPED_ENUM_DECLARE_BEGIN(future_status)
{
ready,
timeout,
deferred
}
BOOST_SCOPED_ENUM_DECLARE_END(future_status)
class BOOST_SYMBOL_VISIBLE future_error
: public std::logic_error
{
system::error_code ec_;
public:
future_error(system::error_code ec)
: logic_error(ec.message()),
ec_(ec)
{
}
const system::error_code& code() const BOOST_NOEXCEPT
{
return ec_;
}
const char* what() const BOOST_THREAD_NOEXCEPT_OR_THROW
{
return code().message().c_str();
}
};
class BOOST_SYMBOL_VISIBLE future_uninitialized:
public future_error
{
public:
future_uninitialized() :
future_error(system::make_error_code(future_errc::no_state))
{}
};
class BOOST_SYMBOL_VISIBLE broken_promise:
public future_error
{
public:
broken_promise():
future_error(system::make_error_code(future_errc::broken_promise))
{}
};
class BOOST_SYMBOL_VISIBLE future_already_retrieved:
public future_error
{
public:
future_already_retrieved():
future_error(system::make_error_code(future_errc::future_already_retrieved))
{}
};
class BOOST_SYMBOL_VISIBLE promise_already_satisfied:
public future_error
{
public:
promise_already_satisfied():
future_error(system::make_error_code(future_errc::promise_already_satisfied))
{}
};
class BOOST_SYMBOL_VISIBLE task_already_started:
public future_error
{
public:
task_already_started():
future_error(system::make_error_code(future_errc::promise_already_satisfied))
{}
};
class BOOST_SYMBOL_VISIBLE task_moved:
public future_error
{
public:
task_moved():
future_error(system::make_error_code(future_errc::no_state))
{}
};
class promise_moved:
public future_error
{
public:
promise_moved():
future_error(system::make_error_code(future_errc::no_state))
{}
};
namespace future_state
{
enum state { uninitialized, waiting, ready, moved, deferred };
}
namespace detail
{
#if defined BOOST_THREAD_PROVIDES_FUTURE_CONTINUATION
struct future_continuation_base
{
future_continuation_base() {}
virtual ~future_continuation_base() {}
virtual void do_continuation(boost::unique_lock<boost::mutex>& ) {};
private:
future_continuation_base(future_continuation_base const&);
future_continuation_base& operator=(future_continuation_base const&);
};
template <typename F, typename R, typename C>
struct future_continuation;
#endif
struct relocker
{
boost::unique_lock<boost::mutex>& lock_;
bool unlocked_;
relocker(boost::unique_lock<boost::mutex>& lk):
lock_(lk)
{
lock_.unlock();
unlocked_=true;
}
~relocker()
{
if (unlocked_) {
lock_.lock();
}
}
void lock() {
if (unlocked_) {
lock_.lock();
unlocked_=false;
}
}
private:
relocker& operator=(relocker const&);
};
struct future_object_base : enable_shared_from_this<future_object_base>
{
boost::exception_ptr exception;
bool done;
bool is_deferred_;
launch policy_;
bool is_constructed;
boost::mutex mutex;
boost::condition_variable waiters;
typedef std::list<boost::condition_variable_any*> waiter_list;
waiter_list external_waiters;
boost::function<void()> callback;
//#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
bool thread_was_interrupted;
//#endif
#if defined BOOST_THREAD_PROVIDES_FUTURE_CONTINUATION
shared_ptr<future_continuation_base> continuation_ptr;
#else
shared_ptr<void> continuation_ptr;
#endif
future_object_base():
done(false),
is_deferred_(false),
policy_(launch::none),
is_constructed(false)
//#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
, thread_was_interrupted(false)
//#endif
//#if defined BOOST_THREAD_PROVIDES_FUTURE_CONTINUATION
, continuation_ptr()
//#endif
{}
virtual ~future_object_base()
{}
void set_deferred()
{
is_deferred_ = true;
set_launch_policy(launch::deferred);
}
void set_async()
{
set_launch_policy(launch::async);
}
void set_launch_policy(launch policy)
{
policy_ = policy;
}
waiter_list::iterator register_external_waiter(boost::condition_variable_any& cv)
{
boost::unique_lock<boost::mutex> lock(mutex);
do_callback(lock);
return external_waiters.insert(external_waiters.end(),&cv);
}
void remove_external_waiter(waiter_list::iterator it)
{
boost::lock_guard<boost::mutex> lock(mutex);
external_waiters.erase(it);
}
#if defined BOOST_THREAD_PROVIDES_FUTURE_CONTINUATION
void do_continuation(boost::unique_lock<boost::mutex>& lock)
{
if (continuation_ptr) {
continuation_ptr->do_continuation(lock);
}
}
#else
void do_continuation(boost::unique_lock<boost::mutex>&)
{
}
#endif
#if defined BOOST_THREAD_PROVIDES_FUTURE_CONTINUATION
void set_continuation_ptr(future_continuation_base* continuation, boost::unique_lock<boost::mutex>& lock)
{
continuation_ptr.reset(continuation);
if (done) {
do_continuation(lock);
}
}
#endif
void mark_finished_internal(boost::unique_lock<boost::mutex>& lock)
{
done=true;
waiters.notify_all();
for(waiter_list::const_iterator it=external_waiters.begin(),
end=external_waiters.end();it!=end;++it)
{
(*it)->notify_all();
}
do_continuation(lock);
}
void make_ready()
{
boost::unique_lock<boost::mutex> lock(mutex);
mark_finished_internal(lock);
}
void do_callback(boost::unique_lock<boost::mutex>& lock)
{
if(callback && !done)
{
boost::function<void()> local_callback=callback;
relocker relock(lock);
local_callback();
}
}
void wait_internal(boost::unique_lock<boost::mutex> &lock, bool rethrow=true)
{
do_callback(lock);
//if (!done) // fixme why this doesn't works?
{
if (is_deferred_)
{
is_deferred_=false;
execute(lock);
//lock.unlock();
}
else
{
while(!done)
{
waiters.wait(lock);
}
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
if(rethrow && thread_was_interrupted)
{
throw boost::thread_interrupted();
}
#endif
if(rethrow && exception)
{
boost::rethrow_exception(exception);
}
}
}
}
void wait(bool rethrow=true)
{
boost::unique_lock<boost::mutex> lock(mutex);
wait_internal(lock, rethrow);
}
#if defined BOOST_THREAD_USES_DATETIME
bool timed_wait_until(boost::system_time const& target_time)
{
boost::unique_lock<boost::mutex> lock(mutex);
if (is_deferred_)
return false;
do_callback(lock);
while(!done)
{
bool const success=waiters.timed_wait(lock,target_time);
if(!success && !done)
{
return false;
}
}
return true;
}
#endif
#ifdef BOOST_THREAD_USES_CHRONO
template <class Clock, class Duration>
future_status
wait_until(const chrono::time_point<Clock, Duration>& abs_time)
{
boost::unique_lock<boost::mutex> lock(mutex);
if (is_deferred_)
return future_status::deferred;
do_callback(lock);
while(!done)
{
cv_status const st=waiters.wait_until(lock,abs_time);
if(st==cv_status::timeout && !done)
{
return future_status::timeout;
}
}
return future_status::ready;
}
#endif
void mark_exceptional_finish_internal(boost::exception_ptr const& e, boost::unique_lock<boost::mutex>& lock)
{
exception=e;
mark_finished_internal(lock);
}
void mark_exceptional_finish()
{
boost::unique_lock<boost::mutex> lock(mutex);
mark_exceptional_finish_internal(boost::current_exception(), lock);
}
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
void mark_interrupted_finish()
{
boost::unique_lock<boost::mutex> lock(mutex);
thread_was_interrupted=true;
mark_finished_internal(lock);
}
void set_interrupted_at_thread_exit()
{
unique_lock<boost::mutex> lk(mutex);
thread_was_interrupted=true;
if (has_value(lk))
{
throw_exception(promise_already_satisfied());
}
get_current_thread_data()->make_ready_at_thread_exit(shared_from_this());
}
#endif
void set_exception_at_thread_exit(exception_ptr e)
{
unique_lock<boost::mutex> lk(mutex);
if (has_value(lk))
{
throw_exception(promise_already_satisfied());
}
exception=e;
get_current_thread_data()->make_ready_at_thread_exit(shared_from_this());
}
bool has_value()
{
boost::lock_guard<boost::mutex> lock(mutex);
return done && !(exception
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
|| thread_was_interrupted
#endif
);
}
bool has_value(unique_lock<boost::mutex>& )
{
return done && !(exception
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
|| thread_was_interrupted
#endif
);
}
bool has_exception()
{
boost::lock_guard<boost::mutex> lock(mutex);
return done && (exception
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
|| thread_was_interrupted
#endif
);
}
bool has_exception(unique_lock<boost::mutex>&)
{
return done && (exception
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
|| thread_was_interrupted
#endif
);
}
bool is_deferred() const BOOST_NOEXCEPT {
return is_deferred_ == true;
}
launch launch_policy() const BOOST_NOEXCEPT
{
return policy_;
}
template<typename F,typename U>
void set_wait_callback(F f,U* u)
{
boost::lock_guard<boost::mutex> lock(mutex);
callback=boost::bind(f,boost::ref(*u));
}
virtual void execute(boost::unique_lock<boost::mutex>&) {}
private:
future_object_base(future_object_base const&);
future_object_base& operator=(future_object_base const&);
};
template<typename T>
struct future_traits
{
typedef boost::scoped_ptr<T> storage_type;
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
typedef T const& source_reference_type;
struct dummy;
typedef typename boost::mpl::if_<boost::is_fundamental<T>,dummy&,BOOST_THREAD_RV_REF(T)>::type rvalue_source_type;
typedef typename boost::mpl::if_<boost::is_fundamental<T>,T,BOOST_THREAD_RV_REF(T)>::type move_dest_type;
#elif defined BOOST_THREAD_USES_MOVE
typedef T& source_reference_type;
typedef typename boost::mpl::if_<boost::has_move_emulation_enabled<T>,BOOST_THREAD_RV_REF(T),T const&>::type rvalue_source_type;
typedef typename boost::mpl::if_<boost::has_move_emulation_enabled<T>,BOOST_THREAD_RV_REF(T),T>::type move_dest_type;
#else
typedef T& source_reference_type;
typedef typename boost::mpl::if_<boost::thread_detail::is_convertible<T&,BOOST_THREAD_RV_REF(T) >,BOOST_THREAD_RV_REF(T),T const&>::type rvalue_source_type;
typedef typename boost::mpl::if_<boost::thread_detail::is_convertible<T&,BOOST_THREAD_RV_REF(T) >,BOOST_THREAD_RV_REF(T),T>::type move_dest_type;
#endif
typedef const T& shared_future_get_result_type;
static void init(storage_type& storage,source_reference_type t)
{
storage.reset(new T(t));
}
static void init(storage_type& storage,rvalue_source_type t)
{
storage.reset(new T(static_cast<rvalue_source_type>(t)));
}
static void cleanup(storage_type& storage)
{
storage.reset();
}
};
template<typename T>
struct future_traits<T&>
{
typedef T* storage_type;
typedef T& source_reference_type;
struct rvalue_source_type
{};
typedef T& move_dest_type;
typedef T& shared_future_get_result_type;
static void init(storage_type& storage,T& t)
{
storage=&t;
}
static void cleanup(storage_type& storage)
{
storage=0;
}
};
template<>
struct future_traits<void>
{
typedef bool storage_type;
typedef void move_dest_type;
typedef void shared_future_get_result_type;
static void init(storage_type& storage)
{
storage=true;
}
static void cleanup(storage_type& storage)
{
storage=false;
}
};
// Used to create stand-alone futures
template<typename T>
struct future_object:
detail::future_object_base
{
typedef typename future_traits<T>::storage_type storage_type;
typedef typename future_traits<T>::source_reference_type source_reference_type;
typedef typename future_traits<T>::rvalue_source_type rvalue_source_type;
typedef typename future_traits<T>::move_dest_type move_dest_type;
typedef typename future_traits<T>::shared_future_get_result_type shared_future_get_result_type;
storage_type result;
future_object():
result(0)
{}
~future_object()
{
}
void mark_finished_with_result_internal(source_reference_type result_, boost::unique_lock<boost::mutex>& lock)
{
future_traits<T>::init(result,result_);
mark_finished_internal(lock);
}
void mark_finished_with_result_internal(rvalue_source_type result_, boost::unique_lock<boost::mutex>& lock)
{
future_traits<T>::init(result,static_cast<rvalue_source_type>(result_));
mark_finished_internal(lock);
}
void mark_finished_with_result(source_reference_type result_)
{
boost::unique_lock<boost::mutex> lock(mutex);
mark_finished_with_result_internal(result_, lock);
}
void mark_finished_with_result(rvalue_source_type result_)
{
boost::unique_lock<boost::mutex> lock(mutex);
mark_finished_with_result_internal(static_cast<rvalue_source_type>(result_), lock);
}
move_dest_type get()
{
wait();
return static_cast<move_dest_type>(*result);
}
shared_future_get_result_type get_sh()
{
wait();
return static_cast<shared_future_get_result_type>(*result);
}
// todo move this to detail::future_object_base
future_state::state get_state()
{
boost::lock_guard<boost::mutex> guard(mutex);
if(!done)
{
return future_state::waiting;
}
else
{
return future_state::ready;
}
}
void set_value_at_thread_exit(const T & result_)
{
unique_lock<boost::mutex> lk(this->mutex);
if (this->has_value(lk))
{
throw_exception(promise_already_satisfied());
}
future_traits<T>::init(result,result_);
this->is_constructed = true;
get_current_thread_data()->make_ready_at_thread_exit(shared_from_this());
}
void set_value_at_thread_exit(BOOST_THREAD_RV_REF(T) result_)
{
unique_lock<boost::mutex> lk(this->mutex);
if (this->has_value(lk))
throw_exception(promise_already_satisfied());
result.reset(new T(boost::move(result_)));
//future_traits<T>::init(result,static_cast<rvalue_source_type>(result_));
this->is_constructed = true;
get_current_thread_data()->make_ready_at_thread_exit(shared_from_this());
}
private:
future_object(future_object const&);
future_object& operator=(future_object const&);
};
template<typename T>
struct future_object<T&>:
detail::future_object_base
{
typedef typename future_traits<T>::storage_type storage_type;
typedef typename future_traits<T>::source_reference_type source_reference_type;
typedef typename future_traits<T>::rvalue_source_type rvalue_source_type;
typedef typename future_traits<T>::move_dest_type move_dest_type;
typedef typename future_traits<T>::shared_future_get_result_type shared_future_get_result_type;
T* result;
future_object():
result(0)
{}
~future_object()
{
}
void mark_finished_with_result_internal(T& result_, boost::unique_lock<boost::mutex>& lock)
{
//future_traits<T>::init(result,result_);
result= &result_;
mark_finished_internal(lock);
}
// void mark_finished_with_result_internal(rvalue_source_type result_, boost::unique_lock<boost::mutex>& lock)
// {
// future_traits<T>::init(result,static_cast<rvalue_source_type>(result_));
// mark_finished_internal(lock);
// }
void mark_finished_with_result(T& result_)
{
boost::unique_lock<boost::mutex> lock(mutex);
mark_finished_with_result_internal(result_, lock);
}
// void mark_finished_with_result(rvalue_source_type result_)
// {
// boost::unique_lock<boost::mutex> lock(mutex);
// mark_finished_with_result_internal(static_cast<rvalue_source_type>(result_), lock);
// }
T& get()
{
wait();
//return static_cast<T&>(*result);
return *result;
}
T& get_sh()
{
wait();
//return static_cast<shared_future_get_result_type>(*result);
return *result;
}
// todo move this to detail::future_object_base
future_state::state get_state()
{
boost::lock_guard<boost::mutex> guard(mutex);
if(!done)
{
return future_state::waiting;
}
else
{
return future_state::ready;
}
}
void set_value_at_thread_exit(T& result_)
{
unique_lock<boost::mutex> lk(this->mutex);
if (this->has_value(lk))
throw_exception(promise_already_satisfied());
//future_traits<T>::init(result,result_);
result= &result_;
this->is_constructed = true;
get_current_thread_data()->make_ready_at_thread_exit(shared_from_this());
}
// void set_value_at_thread_exit(rvalue_source_type result_)
// {
// unique_lock<boost::mutex> lk(this->mutex);
// if (this->has_value())
// throw_exception(promise_already_satisfied());
// future_traits<T>::init(result,static_cast<rvalue_source_type>(result_));
// this->is_constructed = true;
// get_current_thread_data()->make_ready_at_thread_exit(shared_from_this());
// }
private:
future_object(future_object const&);
future_object& operator=(future_object const&);
};
template<>
struct future_object<void>:
detail::future_object_base
{
typedef void shared_future_get_result_type;
future_object()
{}
void mark_finished_with_result_internal(boost::unique_lock<boost::mutex>& lock)
{
mark_finished_internal(lock);
}
void mark_finished_with_result()
{
boost::unique_lock<boost::mutex> lock(mutex);
mark_finished_with_result_internal(lock);
}
void get()
{
this->wait();
}
void get_sh()
{
wait();
}
// todo move this to detail::future_object_base
future_state::state get_state()
{
boost::lock_guard<boost::mutex> guard(mutex);
if(!done)
{
return future_state::waiting;
}
else
{
return future_state::ready;
}
}
void set_value_at_thread_exit()
{
unique_lock<boost::mutex> lk(this->mutex);
if (this->has_value(lk))
{
throw_exception(promise_already_satisfied());
}
this->is_constructed = true;
get_current_thread_data()->make_ready_at_thread_exit(shared_from_this());
}
private:
future_object(future_object const&);
future_object& operator=(future_object const&);
};
/////////////////////////
/// future_async_object
/////////////////////////
template<typename Rp, typename Fp>
struct future_async_object: future_object<Rp>
{
typedef future_object<Rp> base_type;
typedef typename base_type::move_dest_type move_dest_type;
boost::thread thr_;
public:
explicit future_async_object(BOOST_THREAD_FWD_REF(Fp) f) :
thr_(&future_async_object::run, this, boost::forward<Fp>(f))
{
this->set_async();
}
~future_async_object()
{
if (thr_.joinable()) thr_.join();
}
move_dest_type get()
{
if (thr_.joinable()) thr_.join();
// fixme Is the lock needed during the whole scope?
//this->wait();
boost::unique_lock<boost::mutex> lock(this->mutex);
this->wait_internal(lock);
return static_cast<move_dest_type>(*(this->result));
}
static void run(future_async_object* that, BOOST_THREAD_FWD_REF(Fp) f)
{
try
{
that->mark_finished_with_result(f());
}
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
catch(thread_interrupted& )
{
that->mark_interrupted_finish();
}
#endif
catch(...)
{
that->mark_exceptional_finish();
}
}
};
template<typename Fp>
struct future_async_object<void, Fp>: public future_object<void>
{
typedef future_object<void> base_type;
boost::thread thr_;
public:
explicit future_async_object(BOOST_THREAD_FWD_REF(Fp) f) :
thr_(&future_async_object::run, this, boost::forward<Fp>(f))
{
this->set_async();
}
~future_async_object()
{
if (thr_.joinable()) thr_.join();
}
static void run(future_async_object* that, BOOST_THREAD_FWD_REF(Fp) f)
{
try
{
f();
that->mark_finished_with_result();
}
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
catch(thread_interrupted& )
{
that->mark_interrupted_finish();
}
#endif
catch(...)
{
that->mark_exceptional_finish();
}
}
};
//////////////////////////
/// future_deferred_object
//////////////////////////
template<typename Rp, typename Fp>
struct future_deferred_object: future_object<Rp>
{
typedef future_object<Rp> base_type;
Fp func_;
public:
explicit future_deferred_object(BOOST_THREAD_FWD_REF(Fp) f)
: func_(boost::forward<Fp>(f))
{
this->set_deferred();
}
virtual void execute(boost::unique_lock<boost::mutex>& lck) {
try
{
this->mark_finished_with_result_internal(func_(), lck);
}
catch (...)
{
this->mark_exceptional_finish_internal(current_exception(), lck);
}
}
};
template<typename Fp>
struct future_deferred_object<void,Fp>: future_object<void>
{
typedef future_object<void> base_type;
Fp func_;
public:
explicit future_deferred_object(BOOST_THREAD_FWD_REF(Fp) f)
: func_(boost::forward<Fp>(f))
{
this->set_deferred();
}
virtual void execute(boost::unique_lock<boost::mutex>& lck) {
try
{
func_();
this->mark_finished_with_result_internal(lck);
}
catch (...)
{
this->mark_exceptional_finish_internal(current_exception(), lck);
}
}
};
// template<typename T, typename Allocator>
// struct future_object_alloc: public future_object<T>
// {
// typedef future_object<T> base;
// Allocator alloc_;
//
// public:
// explicit future_object_alloc(const Allocator& a)
// : alloc_(a) {}
//
// };
class future_waiter
{
struct registered_waiter;
typedef std::vector<int>::size_type count_type;
struct registered_waiter
{
boost::shared_ptr<detail::future_object_base> future_;
detail::future_object_base::waiter_list::iterator wait_iterator;
count_type index;
registered_waiter(boost::shared_ptr<detail::future_object_base> const& a_future,
detail::future_object_base::waiter_list::iterator wait_iterator_,
count_type index_):
future_(a_future),wait_iterator(wait_iterator_),index(index_)
{}
};
struct all_futures_lock
{
#ifdef _MANAGED
typedef std::ptrdiff_t count_type_portable;
#else
typedef count_type count_type_portable;
#endif
count_type_portable count;
boost::scoped_array<boost::unique_lock<boost::mutex> > locks;
all_futures_lock(std::vector<registered_waiter>& futures):
count(futures.size()),locks(new boost::unique_lock<boost::mutex>[count])
{
for(count_type_portable i=0;i<count;++i)
{
#if defined __DECCXX || defined __SUNPRO_CC || defined __hpux
locks[i]=boost::unique_lock<boost::mutex>(futures[i].future_->mutex).move();
#else
locks[i]=boost::unique_lock<boost::mutex>(futures[i].future_->mutex); // TODO shouldn't be moved explicitly
#endif
}
}
void lock()
{
boost::lock(locks.get(),locks.get()+count);
}
void unlock()
{
for(count_type_portable i=0;i<count;++i)
{
locks[i].unlock();
}
}
};
boost::condition_variable_any cv;
std::vector<registered_waiter> futures;
count_type future_count;
public:
future_waiter():
future_count(0)
{}
template<typename F>
void add(F& f)
{
if(f.future_)
{
futures.push_back(registered_waiter(f.future_,f.future_->register_external_waiter(cv),future_count));
}
++future_count;
}
count_type wait()
{
all_futures_lock lk(futures);
for(;;)
{
for(count_type i=0;i<futures.size();++i)
{
if(futures[i].future_->done)
{
return futures[i].index;
}
}
cv.wait(lk);
}
}
~future_waiter()
{
for(count_type i=0;i<futures.size();++i)
{
futures[i].future_->remove_external_waiter(futures[i].wait_iterator);
}
}
};
}
template <typename R>
class BOOST_THREAD_FUTURE;
template <typename R>
class shared_future;
template<typename T>
struct is_future_type
{
BOOST_STATIC_CONSTANT(bool, value=false);
};
template<typename T>
struct is_future_type<BOOST_THREAD_FUTURE<T> >
{
BOOST_STATIC_CONSTANT(bool, value=true);
};
template<typename T>
struct is_future_type<shared_future<T> >
{
BOOST_STATIC_CONSTANT(bool, value=true);
};
template<typename Iterator>
typename boost::disable_if<is_future_type<Iterator>,void>::type wait_for_all(Iterator begin,Iterator end)
{
for(Iterator current=begin;current!=end;++current)
{
current->wait();
}
}
template<typename F1,typename F2>
typename boost::enable_if<is_future_type<F1>,void>::type wait_for_all(F1& f1,F2& f2)
{
f1.wait();
f2.wait();
}
template<typename F1,typename F2,typename F3>
void wait_for_all(F1& f1,F2& f2,F3& f3)
{
f1.wait();
f2.wait();
f3.wait();
}
template<typename F1,typename F2,typename F3,typename F4>
void wait_for_all(F1& f1,F2& f2,F3& f3,F4& f4)
{
f1.wait();
f2.wait();
f3.wait();
f4.wait();
}
template<typename F1,typename F2,typename F3,typename F4,typename F5>
void wait_for_all(F1& f1,F2& f2,F3& f3,F4& f4,F5& f5)
{
f1.wait();
f2.wait();
f3.wait();
f4.wait();
f5.wait();
}
template<typename Iterator>
typename boost::disable_if<is_future_type<Iterator>,Iterator>::type wait_for_any(Iterator begin,Iterator end)
{
if(begin==end)
return end;
detail::future_waiter waiter;
for(Iterator current=begin;current!=end;++current)
{
waiter.add(*current);
}
return boost::next(begin,waiter.wait());
}
template<typename F1,typename F2>
typename boost::enable_if<is_future_type<F1>,unsigned>::type wait_for_any(F1& f1,F2& f2)
{
detail::future_waiter waiter;
waiter.add(f1);
waiter.add(f2);
return waiter.wait();
}
template<typename F1,typename F2,typename F3>
unsigned wait_for_any(F1& f1,F2& f2,F3& f3)
{
detail::future_waiter waiter;
waiter.add(f1);
waiter.add(f2);
waiter.add(f3);
return waiter.wait();
}
template<typename F1,typename F2,typename F3,typename F4>
unsigned wait_for_any(F1& f1,F2& f2,F3& f3,F4& f4)
{
detail::future_waiter waiter;
waiter.add(f1);
waiter.add(f2);
waiter.add(f3);
waiter.add(f4);
return waiter.wait();
}
template<typename F1,typename F2,typename F3,typename F4,typename F5>
unsigned wait_for_any(F1& f1,F2& f2,F3& f3,F4& f4,F5& f5)
{
detail::future_waiter waiter;
waiter.add(f1);
waiter.add(f2);
waiter.add(f3);
waiter.add(f4);
waiter.add(f5);
return waiter.wait();
}
template <typename R>
class promise;
template <typename R>
class packaged_task;
namespace detail
{
/// Common implementation for all the futures independently of the return type
class base_future
{
//BOOST_THREAD_MOVABLE(base_future)
};
/// Common implementation for future and shared_future.
template <typename R>
class basic_future : public base_future
{
protected:
typedef boost::shared_ptr<detail::future_object<R> > future_ptr;
future_ptr future_;
basic_future(future_ptr a_future):
future_(a_future)
{
}
// Copy construction from a shared_future
explicit basic_future(const shared_future<R>&) BOOST_NOEXCEPT;
public:
typedef future_state::state state;
BOOST_THREAD_MOVABLE(basic_future)
basic_future(): future_() {}
~basic_future() {}
basic_future(BOOST_THREAD_RV_REF(basic_future) other) BOOST_NOEXCEPT:
future_(BOOST_THREAD_RV(other).future_)
{
BOOST_THREAD_RV(other).future_.reset();
}
basic_future& operator=(BOOST_THREAD_RV_REF(basic_future) other) BOOST_NOEXCEPT
{
future_=BOOST_THREAD_RV(other).future_;
BOOST_THREAD_RV(other).future_.reset();
return *this;
}
void swap(basic_future& that) BOOST_NOEXCEPT
{
future_.swap(that.future_);
}
// functions to check state, and wait for ready
state get_state() const BOOST_NOEXCEPT
{
if(!future_)
{
return future_state::uninitialized;
}
return future_->get_state();
}
bool is_ready() const BOOST_NOEXCEPT
{
return get_state()==future_state::ready;
}
bool has_exception() const BOOST_NOEXCEPT
{
return future_ && future_->has_exception();
}
bool has_value() const BOOST_NOEXCEPT
{
return future_ && future_->has_value();
}
launch launch_policy() const BOOST_NOEXCEPT
{
if ( future_ ) return future_->launch_policy();
else return launch(launch::none);
}
bool valid() const BOOST_NOEXCEPT
{
return future_ != 0;
}
void wait() const
{
if(!future_)
{
boost::throw_exception(future_uninitialized());
}
future_->wait(false);
}
#if defined BOOST_THREAD_USES_DATETIME
template<typename Duration>
bool timed_wait(Duration const& rel_time) const
{
return timed_wait_until(boost::get_system_time()+rel_time);
}
bool timed_wait_until(boost::system_time const& abs_time) const
{
if(!future_)
{
boost::throw_exception(future_uninitialized());
}
return future_->timed_wait_until(abs_time);
}
#endif
#ifdef BOOST_THREAD_USES_CHRONO
template <class Rep, class Period>
future_status
wait_for(const chrono::duration<Rep, Period>& rel_time) const
{
return wait_until(chrono::steady_clock::now() + rel_time);
}
template <class Clock, class Duration>
future_status
wait_until(const chrono::time_point<Clock, Duration>& abs_time) const
{
if(!future_)
{
boost::throw_exception(future_uninitialized());
}
return future_->wait_until(abs_time);
}
#endif
};
} // detail
BOOST_THREAD_DCL_MOVABLE_BEG(R) detail::basic_future<R> BOOST_THREAD_DCL_MOVABLE_END
namespace detail
{
template <class Rp, class Fp>
BOOST_THREAD_FUTURE<Rp>
make_future_async_object(BOOST_THREAD_FWD_REF(Fp) f);
template <class Rp, class Fp>
BOOST_THREAD_FUTURE<Rp>
make_future_deferred_object(BOOST_THREAD_FWD_REF(Fp) f);
}
template <typename R>
class BOOST_THREAD_FUTURE : public detail::basic_future<R>
{
private:
typedef detail::basic_future<R> base_type;
typedef typename base_type::future_ptr future_ptr;
friend class shared_future<R>;
friend class promise<R>;
#if defined BOOST_THREAD_PROVIDES_FUTURE_CONTINUATION
template <typename, typename, typename>
friend struct detail::future_continuation;
#endif
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK
template <class> friend class packaged_task; // todo check if this works in windows
#else
friend class packaged_task<R>;
#endif
friend class detail::future_waiter;
template <class Rp, class Fp>
friend BOOST_THREAD_FUTURE<Rp>
detail::make_future_async_object(BOOST_THREAD_FWD_REF(Fp) f);
template <class Rp, class Fp>
friend BOOST_THREAD_FUTURE<Rp>
detail::make_future_deferred_object(BOOST_THREAD_FWD_REF(Fp) f);
typedef typename detail::future_traits<R>::move_dest_type move_dest_type;
BOOST_THREAD_FUTURE(future_ptr a_future):
base_type(a_future)
{
}
public:
BOOST_THREAD_MOVABLE_ONLY(BOOST_THREAD_FUTURE)
typedef future_state::state state;
BOOST_THREAD_FUTURE() {}
~BOOST_THREAD_FUTURE() {}
BOOST_THREAD_FUTURE(BOOST_THREAD_RV_REF(BOOST_THREAD_FUTURE) other) BOOST_NOEXCEPT:
base_type(boost::move(static_cast<base_type&>(BOOST_THREAD_RV(other))))
{
}
BOOST_THREAD_FUTURE& operator=(BOOST_THREAD_RV_REF(BOOST_THREAD_FUTURE) other) BOOST_NOEXCEPT
{
base_type::operator=(boost::move(static_cast<base_type&>(BOOST_THREAD_RV(other))));
return *this;
}
shared_future<R> share()
{
return shared_future<R>(::boost::move(*this));
}
void swap(BOOST_THREAD_FUTURE& other)
{
static_cast<base_type*>(this)->swap(other);
}
// retrieving the value
move_dest_type get()
{
if(!this->future_)
{
boost::throw_exception(future_uninitialized());
}
#ifdef BOOST_THREAD_PROVIDES_FUTURE_INVALID_AFTER_GET
future_ptr fut_=this->future_;
this->future_.reset();
return fut_->get();
#else
return this->future_->get();
#endif
}
#if defined BOOST_THREAD_PROVIDES_FUTURE_CONTINUATION
// template<typename F>
// auto then(F&& func) -> BOOST_THREAD_FUTURE<decltype(func(*this))>;
#if defined(BOOST_THREAD_RVALUE_REFERENCES_DONT_MATCH_FUNTION_PTR)
template<typename RF>
inline BOOST_THREAD_FUTURE<RF> then(RF(*func)(BOOST_THREAD_FUTURE&));
template<typename RF>
inline BOOST_THREAD_FUTURE<RF> then(launch policy, RF(*func)(BOOST_THREAD_FUTURE&));
#endif
template<typename F>
inline BOOST_THREAD_FUTURE<typename boost::result_of<F(BOOST_THREAD_FUTURE&)>::type>
then(BOOST_THREAD_RV_REF(F) func);
template<typename F>
inline BOOST_THREAD_FUTURE<typename boost::result_of<F(BOOST_THREAD_FUTURE&)>::type>
then(launch policy, BOOST_THREAD_RV_REF(F) func);
#endif
};
BOOST_THREAD_DCL_MOVABLE_BEG(T) BOOST_THREAD_FUTURE<T> BOOST_THREAD_DCL_MOVABLE_END
template <typename R>
class shared_future : public detail::basic_future<R>
{
typedef detail::basic_future<R> base_type;
typedef typename base_type::future_ptr future_ptr;
friend class detail::future_waiter;
friend class promise<R>;
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK
template <class> friend class packaged_task;// todo check if this works in windows
#else
friend class packaged_task<R>;
#endif
shared_future(future_ptr a_future):
base_type(a_future)
{}
public:
BOOST_THREAD_MOVABLE(shared_future)
shared_future(shared_future const& other):
base_type(other)
{}
typedef future_state::state state;
shared_future()
{}
~shared_future()
{}
shared_future& operator=(shared_future const& other)
{
shared_future(other).swap(*this);
return *this;
}
shared_future(BOOST_THREAD_RV_REF(shared_future) other) BOOST_NOEXCEPT :
base_type(boost::move(static_cast<base_type&>(BOOST_THREAD_RV(other))))
{
BOOST_THREAD_RV(other).future_.reset();
}
shared_future(BOOST_THREAD_RV_REF( BOOST_THREAD_FUTURE<R> ) other) BOOST_NOEXCEPT :
base_type(boost::move(static_cast<base_type&>(BOOST_THREAD_RV(other))))
{
}
shared_future& operator=(BOOST_THREAD_RV_REF(shared_future) other) BOOST_NOEXCEPT
{
base_type::operator=(boost::move(static_cast<base_type&>(BOOST_THREAD_RV(other))));
return *this;
}
shared_future& operator=(BOOST_THREAD_RV_REF( BOOST_THREAD_FUTURE<R> ) other) BOOST_NOEXCEPT
{
base_type::operator=(boost::move(static_cast<base_type&>(BOOST_THREAD_RV(other))));
//shared_future(boost::move(other)).swap(*this);
//this->future_.swap(BOOST_THREAD_RV(other).future_);
//BOOST_THREAD_RV(other).future_.reset();
return *this;
}
void swap(shared_future& other) BOOST_NOEXCEPT
{
static_cast<base_type*>(this)->swap(other);
}
// retrieving the value
typename detail::future_object<R>::shared_future_get_result_type get()
{
if(!this->future_)
{
boost::throw_exception(future_uninitialized());
}
return this->future_->get_sh();
}
};
BOOST_THREAD_DCL_MOVABLE_BEG(T) shared_future<T> BOOST_THREAD_DCL_MOVABLE_END
namespace detail
{
/// Copy construction from a shared_future
template <typename R>
inline basic_future<R>::basic_future(const shared_future<R>& other) BOOST_NOEXCEPT
: future_(other.future_)
{
}
}
template <typename R>
class promise
{
typedef boost::shared_ptr<detail::future_object<R> > future_ptr;
future_ptr future_;
bool future_obtained;
void lazy_init()
{
#if defined BOOST_THREAD_PROVIDES_PROMISE_LAZY
if(!atomic_load(&future_))
{
future_ptr blank;
atomic_compare_exchange(&future_,&blank,future_ptr(new detail::future_object<R>));
}
#endif
}
public:
BOOST_THREAD_MOVABLE_ONLY(promise)
#if defined BOOST_THREAD_PROVIDES_FUTURE_CTOR_ALLOCATORS
template <class Allocator>
promise(boost::allocator_arg_t, Allocator a)
{
typedef typename Allocator::template rebind<detail::future_object<R> >::other A2;
A2 a2(a);
typedef thread_detail::allocator_destructor<A2> D;
future_ = future_ptr(::new(a2.allocate(1)) detail::future_object<R>(), D(a2, 1) );
future_obtained = false;
}
#endif
promise():
#if defined BOOST_THREAD_PROVIDES_PROMISE_LAZY
future_(),
#else
future_(new detail::future_object<R>()),
#endif
future_obtained(false)
{}
~promise()
{
if(future_)
{
boost::unique_lock<boost::mutex> lock(future_->mutex);
if(!future_->done)
{
future_->mark_exceptional_finish_internal(boost::copy_exception(broken_promise()), lock);
}
}
}
// Assignment
promise(BOOST_THREAD_RV_REF(promise) rhs) BOOST_NOEXCEPT :
future_(BOOST_THREAD_RV(rhs).future_),future_obtained(BOOST_THREAD_RV(rhs).future_obtained)
{
BOOST_THREAD_RV(rhs).future_.reset();
BOOST_THREAD_RV(rhs).future_obtained=false;
}
promise & operator=(BOOST_THREAD_RV_REF(promise) rhs) BOOST_NOEXCEPT
{
future_=BOOST_THREAD_RV(rhs).future_;
future_obtained=BOOST_THREAD_RV(rhs).future_obtained;
BOOST_THREAD_RV(rhs).future_.reset();
BOOST_THREAD_RV(rhs).future_obtained=false;
return *this;
}
void swap(promise& other)
{
future_.swap(other.future_);
std::swap(future_obtained,other.future_obtained);
}
// Result retrieval
BOOST_THREAD_FUTURE<R> get_future()
{
lazy_init();
if (future_.get()==0)
{
boost::throw_exception(promise_moved());
}
if (future_obtained)
{
boost::throw_exception(future_already_retrieved());
}
future_obtained=true;
return BOOST_THREAD_FUTURE<R>(future_);
}
void set_value(typename detail::future_traits<R>::source_reference_type r)
{
lazy_init();
boost::unique_lock<boost::mutex> lock(future_->mutex);
if(future_->done)
{
boost::throw_exception(promise_already_satisfied());
}
future_->mark_finished_with_result_internal(r, lock);
}
// void set_value(R && r);
void set_value(typename detail::future_traits<R>::rvalue_source_type r)
{
lazy_init();
boost::unique_lock<boost::mutex> lock(future_->mutex);
if(future_->done)
{
boost::throw_exception(promise_already_satisfied());
}
future_->mark_finished_with_result_internal(static_cast<typename detail::future_traits<R>::rvalue_source_type>(r), lock);
}
void set_exception(boost::exception_ptr p)
{
lazy_init();
boost::unique_lock<boost::mutex> lock(future_->mutex);
if(future_->done)
{
boost::throw_exception(promise_already_satisfied());
}
future_->mark_exceptional_finish_internal(p, lock);
}
// setting the result with deferred notification
void set_value_at_thread_exit(const R& r)
{
if (future_.get()==0)
{
boost::throw_exception(promise_moved());
}
future_->set_value_at_thread_exit(r);
}
void set_value_at_thread_exit(BOOST_THREAD_RV_REF(R) r)
{
if (future_.get()==0)
{
boost::throw_exception(promise_moved());
}
future_->set_value_at_thread_exit(boost::move(r));
}
void set_exception_at_thread_exit(exception_ptr e)
{
if (future_.get()==0)
{
boost::throw_exception(promise_moved());
}
future_->set_exception_at_thread_exit(e);
}
template<typename F>
void set_wait_callback(F f)
{
lazy_init();
future_->set_wait_callback(f,this);
}
};
template <typename R>
class promise<R&>
{
typedef boost::shared_ptr<detail::future_object<R&> > future_ptr;
future_ptr future_;
bool future_obtained;
void lazy_init()
{
#if defined BOOST_THREAD_PROVIDES_PROMISE_LAZY
if(!atomic_load(&future_))
{
future_ptr blank;
atomic_compare_exchange(&future_,&blank,future_ptr(new detail::future_object<R&>));
}
#endif
}
public:
BOOST_THREAD_MOVABLE_ONLY(promise)
#if defined BOOST_THREAD_PROVIDES_FUTURE_CTOR_ALLOCATORS
template <class Allocator>
promise(boost::allocator_arg_t, Allocator a)
{
typedef typename Allocator::template rebind<detail::future_object<R&> >::other A2;
A2 a2(a);
typedef thread_detail::allocator_destructor<A2> D;
future_ = future_ptr(::new(a2.allocate(1)) detail::future_object<R&>(), D(a2, 1) );
future_obtained = false;
}
#endif
promise():
#if defined BOOST_THREAD_PROVIDES_PROMISE_LAZY
future_(),
#else
future_(new detail::future_object<R&>()),
#endif
future_obtained(false)
{}
~promise()
{
if(future_)
{
boost::unique_lock<boost::mutex> lock(future_->mutex);
if(!future_->done)
{
future_->mark_exceptional_finish_internal(boost::copy_exception(broken_promise()), lock);
}
}
}
// Assignment
promise(BOOST_THREAD_RV_REF(promise) rhs) BOOST_NOEXCEPT :
future_(BOOST_THREAD_RV(rhs).future_),future_obtained(BOOST_THREAD_RV(rhs).future_obtained)
{
BOOST_THREAD_RV(rhs).future_.reset();
BOOST_THREAD_RV(rhs).future_obtained=false;
}
promise & operator=(BOOST_THREAD_RV_REF(promise) rhs) BOOST_NOEXCEPT
{
future_=BOOST_THREAD_RV(rhs).future_;
future_obtained=BOOST_THREAD_RV(rhs).future_obtained;
BOOST_THREAD_RV(rhs).future_.reset();
BOOST_THREAD_RV(rhs).future_obtained=false;
return *this;
}
void swap(promise& other)
{
future_.swap(other.future_);
std::swap(future_obtained,other.future_obtained);
}
// Result retrieval
BOOST_THREAD_FUTURE<R&> get_future()
{
lazy_init();
if (future_.get()==0)
{
boost::throw_exception(promise_moved());
}
if (future_obtained)
{
boost::throw_exception(future_already_retrieved());
}
future_obtained=true;
return BOOST_THREAD_FUTURE<R&>(future_);
}
void set_value(R& r)
{
lazy_init();
boost::unique_lock<boost::mutex> lock(future_->mutex);
if(future_->done)
{
boost::throw_exception(promise_already_satisfied());
}
future_->mark_finished_with_result_internal(r, lock);
}
void set_exception(boost::exception_ptr p)
{
lazy_init();
boost::unique_lock<boost::mutex> lock(future_->mutex);
if(future_->done)
{
boost::throw_exception(promise_already_satisfied());
}
future_->mark_exceptional_finish_internal(p, lock);
}
// setting the result with deferred notification
void set_value_at_thread_exit(R& r)
{
if (future_.get()==0)
{
boost::throw_exception(promise_moved());
}
future_->set_value_at_thread_exit(r);
}
void set_exception_at_thread_exit(exception_ptr e)
{
if (future_.get()==0)
{
boost::throw_exception(promise_moved());
}
future_->set_exception_at_thread_exit(e);
}
template<typename F>
void set_wait_callback(F f)
{
lazy_init();
future_->set_wait_callback(f,this);
}
};
template <>
class promise<void>
{
typedef boost::shared_ptr<detail::future_object<void> > future_ptr;
future_ptr future_;
bool future_obtained;
void lazy_init()
{
#if defined BOOST_THREAD_PROVIDES_PROMISE_LAZY
if(!atomic_load(&future_))
{
future_ptr blank;
atomic_compare_exchange(&future_,&blank,future_ptr(new detail::future_object<void>));
}
#endif
}
public:
BOOST_THREAD_MOVABLE_ONLY(promise)
#if defined BOOST_THREAD_PROVIDES_FUTURE_CTOR_ALLOCATORS
template <class Allocator>
promise(boost::allocator_arg_t, Allocator a)
{
typedef typename Allocator::template rebind<detail::future_object<void> >::other A2;
A2 a2(a);
typedef thread_detail::allocator_destructor<A2> D;
future_ = future_ptr(::new(a2.allocate(1)) detail::future_object<void>(), D(a2, 1) );
future_obtained = false;
}
#endif
promise():
#if defined BOOST_THREAD_PROVIDES_PROMISE_LAZY
future_(),
#else
future_(new detail::future_object<void>),
#endif
future_obtained(false)
{}
~promise()
{
if(future_)
{
boost::unique_lock<boost::mutex> lock(future_->mutex);
if(!future_->done)
{
future_->mark_exceptional_finish_internal(boost::copy_exception(broken_promise()), lock);
}
}
}
// Assignment
promise(BOOST_THREAD_RV_REF(promise) rhs) BOOST_NOEXCEPT :
future_(BOOST_THREAD_RV(rhs).future_),future_obtained(BOOST_THREAD_RV(rhs).future_obtained)
{
// we need to release the future as shared_ptr doesn't implements move semantics
BOOST_THREAD_RV(rhs).future_.reset();
BOOST_THREAD_RV(rhs).future_obtained=false;
}
promise & operator=(BOOST_THREAD_RV_REF(promise) rhs) BOOST_NOEXCEPT
{
future_=BOOST_THREAD_RV(rhs).future_;
future_obtained=BOOST_THREAD_RV(rhs).future_obtained;
BOOST_THREAD_RV(rhs).future_.reset();
BOOST_THREAD_RV(rhs).future_obtained=false;
return *this;
}
void swap(promise& other)
{
future_.swap(other.future_);
std::swap(future_obtained,other.future_obtained);
}
// Result retrieval
BOOST_THREAD_FUTURE<void> get_future()
{
lazy_init();
if (future_.get()==0)
{
boost::throw_exception(promise_moved());
}
if(future_obtained)
{
boost::throw_exception(future_already_retrieved());
}
future_obtained=true;
return BOOST_THREAD_FUTURE<void>(future_);
}
void set_value()
{
lazy_init();
boost::unique_lock<boost::mutex> lock(future_->mutex);
if(future_->done)
{
boost::throw_exception(promise_already_satisfied());
}
future_->mark_finished_with_result_internal(lock);
}
void set_exception(boost::exception_ptr p)
{
lazy_init();
boost::unique_lock<boost::mutex> lock(future_->mutex);
if(future_->done)
{
boost::throw_exception(promise_already_satisfied());
}
future_->mark_exceptional_finish_internal(p,lock);
}
// setting the result with deferred notification
void set_value_at_thread_exit()
{
if (future_.get()==0)
{
boost::throw_exception(promise_moved());
}
future_->set_value_at_thread_exit();
}
void set_exception_at_thread_exit(exception_ptr e)
{
if (future_.get()==0)
{
boost::throw_exception(promise_moved());
}
future_->set_exception_at_thread_exit(e);
}
template<typename F>
void set_wait_callback(F f)
{
lazy_init();
future_->set_wait_callback(f,this);
}
};
#if defined BOOST_THREAD_PROVIDES_FUTURE_CTOR_ALLOCATORS
namespace container
{
template <class R, class Alloc>
struct uses_allocator<promise<R> , Alloc> : true_type
{
};
}
#endif
BOOST_THREAD_DCL_MOVABLE_BEG(T) promise<T> BOOST_THREAD_DCL_MOVABLE_END
namespace detail
{
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK
template<typename R>
struct task_base;
#if defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
template<typename R, typename ...ArgTypes>
struct task_base<R(ArgTypes...)>:
#else
template<typename R>
struct task_base<R()>:
#endif
#else
template<typename R>
struct task_base:
#endif
detail::future_object<R>
{
bool started;
task_base():
started(false)
{}
void reset()
{
started=false;
}
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK && defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
virtual void do_run(BOOST_THREAD_RV_REF(ArgTypes) ... args)=0;
void run(BOOST_THREAD_RV_REF(ArgTypes) ... args)
#else
virtual void do_run()=0;
void run()
#endif
{
{
boost::lock_guard<boost::mutex> lk(this->mutex);
if(started)
{
boost::throw_exception(task_already_started());
}
started=true;
}
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK && defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
do_run(boost::forward<ArgTypes>(args)...);
#else
do_run();
#endif
}
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK && defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
virtual void do_apply(BOOST_THREAD_RV_REF(ArgTypes) ... args)=0;
void apply(BOOST_THREAD_RV_REF(ArgTypes) ... args)
#else
virtual void do_apply()=0;
void apply()
#endif
{
{
boost::lock_guard<boost::mutex> lk(this->mutex);
if(started)
{
boost::throw_exception(task_already_started());
}
started=true;
}
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK && defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
do_apply(boost::forward<ArgTypes>(args)...);
#else
do_apply();
#endif
}
void owner_destroyed()
{
boost::unique_lock<boost::mutex> lk(this->mutex);
if(!started)
{
started=true;
this->mark_exceptional_finish_internal(boost::copy_exception(boost::broken_promise()), lk);
}
}
};
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK
template<typename F, typename R>
struct task_object;
#if defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
template<typename F, typename R, typename ...ArgTypes>
struct task_object<F, R(ArgTypes...)>:
task_base<R(ArgTypes...)>
#else
template<typename F, typename R>
struct task_object<F, R()>:
task_base<R()>
#endif
#else
template<typename F, typename R>
struct task_object:
task_base<R>
#endif
{
private:
task_object(task_object&);
public:
F f;
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
task_object(BOOST_THREAD_RV_REF(F) f_):
f(boost::forward<F>(f_))
{}
#else
task_object(F const& f_):
f(f_)
{}
task_object(BOOST_THREAD_RV_REF(F) f_):
f(boost::move(f_)) // TODO forward
{}
#endif
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK && defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
void do_apply(BOOST_THREAD_RV_REF(ArgTypes) ... args)
{
try
{
this->set_value_at_thread_exit(f(boost::forward<ArgTypes>(args)...));
}
#else
void do_apply()
{
try
{
this->set_value_at_thread_exit(f());
}
#endif
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
catch(thread_interrupted& )
{
this->set_interrupted_at_thread_exit();
}
#endif
catch(...)
{
this->set_exception_at_thread_exit(current_exception());
}
}
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK && defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
void do_run(BOOST_THREAD_RV_REF(ArgTypes) ... args)
{
try
{
this->mark_finished_with_result(f(boost::forward<ArgTypes>(args)...));
}
#else
void do_run()
{
try
{
this->mark_finished_with_result(f());
}
#endif
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
catch(thread_interrupted& )
{
this->mark_interrupted_finish();
}
#endif
catch(...)
{
this->mark_exceptional_finish();
}
}
};
#if defined(BOOST_THREAD_RVALUE_REFERENCES_DONT_MATCH_FUNTION_PTR)
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK
#if defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
template<typename R, typename ...ArgTypes>
struct task_object<R (*)(ArgTypes...), R(ArgTypes...)>:
task_base<R(ArgTypes...)>
#else
template<typename R>
struct task_object<R (*)(), R()>:
task_base<R()>
#endif
#else
template<typename R>
struct task_object<R (*)(), R> :
task_base<R>
#endif
{
private:
task_object(task_object&);
public:
R (*f)();
task_object(R (*f_)()):
f(f_)
{}
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK && defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
void do_apply(BOOST_THREAD_RV_REF(ArgTypes) ... args)
{
try
{
this->set_value_at_thread_exit(f(boost::forward<ArgTypes>(args)...));
}
#else
void do_apply()
{
try
{
this->set_value_at_thread_exit(f());
}
#endif
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
catch(thread_interrupted& )
{
this->set_interrupted_at_thread_exit();
}
#endif
catch(...)
{
this->set_exception_at_thread_exit(current_exception());
}
}
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK && defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
void do_run(BOOST_THREAD_RV_REF(ArgTypes) ... args)
{
try
{
this->mark_finished_with_result(f(boost::forward<ArgTypes>(args)...));
}
#else
void do_run()
{
try
{
this->mark_finished_with_result(f());
}
#endif
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
catch(thread_interrupted& )
{
this->mark_interrupted_finish();
}
#endif
catch(...)
{
this->mark_exceptional_finish();
}
}
};
#endif
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK
#if defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
template<typename F, typename ...ArgTypes>
struct task_object<F, void(ArgTypes...)>:
task_base<void(ArgTypes...)>
#else
template<typename F>
struct task_object<F, void()>:
task_base<void()>
#endif
#else
template<typename F>
struct task_object<F,void>:
task_base<void>
#endif
{
private:
task_object(task_object&);
public:
F f;
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
task_object(BOOST_THREAD_RV_REF(F) f_):
f(boost::forward<F>(f_))
{}
#else
task_object(F const& f_):
f(f_)
{}
task_object(BOOST_THREAD_RV_REF(F) f_):
f(boost::move(f_)) // TODO forward
{}
#endif
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK && defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
void do_apply(BOOST_THREAD_RV_REF(ArgTypes) ... args)
{
try
{
f(boost::forward<ArgTypes>(args)...);
#else
void do_apply()
{
try
{
f();
#endif
this->set_value_at_thread_exit();
}
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
catch(thread_interrupted& )
{
this->set_interrupted_at_thread_exit();
}
#endif
catch(...)
{
this->set_exception_at_thread_exit(current_exception());
}
}
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK && defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
void do_run(BOOST_THREAD_RV_REF(ArgTypes) ... args)
{
try
{
f(boost::forward<ArgTypes>(args)...);
#else
void do_run()
{
try
{
f();
#endif
this->mark_finished_with_result();
}
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
catch(thread_interrupted& )
{
this->mark_interrupted_finish();
}
#endif
catch(...)
{
this->mark_exceptional_finish();
}
}
};
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK
#if defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
template<typename ...ArgTypes>
struct task_object<void (*)(ArgTypes...), void(ArgTypes...)>:
task_base<void(ArgTypes...)>
#else
template<>
struct task_object<void (*)(), void()>:
task_base<void()>
#endif
#else
template<>
struct task_object<void (*)(),void>:
task_base<void>
#endif
{
private:
task_object(task_object&);
public:
void (*f)();
task_object(void (*f_)()):
f(f_)
{}
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK && defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
void do_apply(BOOST_THREAD_RV_REF(ArgTypes) ... args)
{
try
{
f(boost::forward<ArgTypes>(args)...);
#else
void do_apply()
{
try
{
f();
#endif
this->set_value_at_thread_exit();
}
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
catch(thread_interrupted& )
{
this->set_interrupted_at_thread_exit();
}
#endif
catch(...)
{
this->set_exception_at_thread_exit(current_exception());
}
}
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK && defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
void do_run(BOOST_THREAD_RV_REF(ArgTypes) ... args)
{
try
{
f(boost::forward<ArgTypes>(args)...);
#else
void do_run()
{
try
{
f();
#endif
this->mark_finished_with_result();
}
#if defined BOOST_THREAD_PROVIDES_INTERRUPTIONS
catch(thread_interrupted& )
{
this->mark_interrupted_finish();
}
#endif
catch(...)
{
this->mark_exceptional_finish();
}
}
};
}
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK
#if defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
template<typename R, typename ...ArgTypes>
class packaged_task<R(ArgTypes...)>
{
typedef boost::shared_ptr<detail::task_base<R(ArgTypes...)> > task_ptr;
boost::shared_ptr<detail::task_base<R(ArgTypes...)> > task;
#else
template<typename R>
class packaged_task<R()>
{
typedef boost::shared_ptr<detail::task_base<R()> > task_ptr;
boost::shared_ptr<detail::task_base<R()> > task;
#endif
#else
template<typename R>
class packaged_task
{
typedef boost::shared_ptr<detail::task_base<R> > task_ptr;
boost::shared_ptr<detail::task_base<R> > task;
#endif
bool future_obtained;
struct dummy;
public:
typedef R result_type;
BOOST_THREAD_MOVABLE_ONLY(packaged_task)
packaged_task():
future_obtained(false)
{}
// construction and destruction
#if defined(BOOST_THREAD_RVALUE_REFERENCES_DONT_MATCH_FUNTION_PTR)
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK
#if defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
explicit packaged_task(R(*f)(), BOOST_THREAD_FWD_REF(ArgTypes)... args)
{
typedef R(*FR)(BOOST_THREAD_FWD_REF(ArgTypes)...);
typedef detail::task_object<FR,R(ArgTypes...)> task_object_type;
task= task_ptr(new task_object_type(f, boost::forward<ArgTypes>(args)...));
future_obtained=false;
}
#else
explicit packaged_task(R(*f)())
{
typedef R(*FR)();
typedef detail::task_object<FR,R()> task_object_type;
task= task_ptr(new task_object_type(f));
future_obtained=false;
}
#endif
#else
explicit packaged_task(R(*f)())
{
typedef R(*FR)();
typedef detail::task_object<FR,R> task_object_type;
task= task_ptr(new task_object_type(f));
future_obtained=false;
}
#endif
#endif
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
template <class F>
explicit packaged_task(BOOST_THREAD_RV_REF(F) f
, typename disable_if<is_same<typename decay<F>::type, packaged_task>, dummy* >::type=0
)
{
//typedef typename remove_cv<typename remove_reference<F>::type>::type FR;
typedef F FR;
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK
#if defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
typedef detail::task_object<FR,R(ArgTypes...)> task_object_type;
#else
typedef detail::task_object<FR,R()> task_object_type;
#endif
#else
typedef detail::task_object<FR,R> task_object_type;
#endif
task = task_ptr(new task_object_type(boost::forward<F>(f)));
future_obtained = false;
}
#else
template <class F>
explicit packaged_task(F const& f
, typename disable_if<is_same<typename decay<F>::type, packaged_task>, dummy* >::type=0
)
{
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK
#if defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
typedef detail::task_object<F,R(ArgTypes...)> task_object_type;
#else
typedef detail::task_object<F,R()> task_object_type;
#endif
#else
typedef detail::task_object<F,R> task_object_type;
#endif
task = task_ptr(new task_object_type(f));
future_obtained=false;
}
template <class F>
explicit packaged_task(BOOST_THREAD_RV_REF(F) f)
{
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK
#if defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
typedef detail::task_object<F,R(ArgTypes...)> task_object_type;
task = task_ptr(new task_object_type(boost::forward<F>(f)));
#else
typedef detail::task_object<F,R()> task_object_type;
task = task_ptr(new task_object_type(boost::move<F>(f))); // TODO forward
#endif
#else
typedef detail::task_object<F,R> task_object_type;
task = task_ptr(new task_object_type(boost::forward<F>(f)));
#endif
future_obtained=false;
}
#endif
#if defined BOOST_THREAD_PROVIDES_FUTURE_CTOR_ALLOCATORS
#if defined(BOOST_THREAD_RVALUE_REFERENCES_DONT_MATCH_FUNTION_PTR)
template <class Allocator>
packaged_task(boost::allocator_arg_t, Allocator a, R(*f)())
{
typedef R(*FR)();
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK
#if defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
typedef detail::task_object<FR,R(ArgTypes...)> task_object_type;
#else
typedef detail::task_object<FR,R()> task_object_type;
#endif
#else
typedef detail::task_object<FR,R> task_object_type;
#endif
typedef typename Allocator::template rebind<task_object_type>::other A2;
A2 a2(a);
typedef thread_detail::allocator_destructor<A2> D;
task = task_ptr(::new(a2.allocate(1)) task_object_type(f), D(a2, 1) );
future_obtained = false;
}
#endif // BOOST_THREAD_RVALUE_REFERENCES_DONT_MATCH_FUNTION_PTR
#if ! defined BOOST_NO_CXX11_RVALUE_REFERENCES
template <class F, class Allocator>
packaged_task(boost::allocator_arg_t, Allocator a, BOOST_THREAD_RV_REF(F) f)
{
//typedef typename remove_cv<typename remove_reference<F>::type>::type FR;
typedef F FR;
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK
#if defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
typedef detail::task_object<FR,R(ArgTypes...)> task_object_type;
#else
typedef detail::task_object<FR,R()> task_object_type;
#endif
#else
typedef detail::task_object<FR,R> task_object_type;
#endif
typedef typename Allocator::template rebind<task_object_type>::other A2;
A2 a2(a);
typedef thread_detail::allocator_destructor<A2> D;
task = task_ptr(::new(a2.allocate(1)) task_object_type(boost::forward<F>(f)), D(a2, 1) );
future_obtained = false;
}
#else // ! defined BOOST_NO_CXX11_RVALUE_REFERENCES
template <class F, class Allocator>
packaged_task(boost::allocator_arg_t, Allocator a, const F& f)
{
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK
#if defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
typedef detail::task_object<F,R(ArgTypes...)> task_object_type;
#else
typedef detail::task_object<F,R()> task_object_type;
#endif
#else
typedef detail::task_object<F,R> task_object_type;
#endif
typedef typename Allocator::template rebind<task_object_type>::other A2;
A2 a2(a);
typedef thread_detail::allocator_destructor<A2> D;
task = task_ptr(::new(a2.allocate(1)) task_object_type(f), D(a2, 1) );
future_obtained = false;
}
template <class F, class Allocator>
packaged_task(boost::allocator_arg_t, Allocator a, BOOST_THREAD_RV_REF(F) f)
{
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK
#if defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
typedef detail::task_object<F,R(ArgTypes...)> task_object_type;
#else
typedef detail::task_object<F,R()> task_object_type;
#endif
#else
typedef detail::task_object<F,R> task_object_type;
#endif
typedef typename Allocator::template rebind<task_object_type>::other A2;
A2 a2(a);
typedef thread_detail::allocator_destructor<A2> D;
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK && defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
task = task_ptr(::new(a2.allocate(1)) task_object_type(boost::forward<F>(f)), D(a2, 1) );
#else
task = task_ptr(::new(a2.allocate(1)) task_object_type(boost::move(f)), D(a2, 1) ); // TODO forward
#endif
future_obtained = false;
}
#endif //BOOST_NO_CXX11_RVALUE_REFERENCES
#endif // BOOST_THREAD_PROVIDES_FUTURE_CTOR_ALLOCATORS
~packaged_task()
{
if(task)
{
task->owner_destroyed();
}
}
// assignment
packaged_task(BOOST_THREAD_RV_REF(packaged_task) other) BOOST_NOEXCEPT :
future_obtained(BOOST_THREAD_RV(other).future_obtained)
{
task.swap(BOOST_THREAD_RV(other).task);
BOOST_THREAD_RV(other).future_obtained=false;
}
packaged_task& operator=(BOOST_THREAD_RV_REF(packaged_task) other) BOOST_NOEXCEPT
{
// todo use forward
packaged_task temp(static_cast<BOOST_THREAD_RV_REF(packaged_task)>(other));
swap(temp);
return *this;
}
void reset()
{
if (!valid())
throw future_error(system::make_error_code(future_errc::no_state));
task->reset();
future_obtained=false;
}
void swap(packaged_task& other) BOOST_NOEXCEPT
{
task.swap(other.task);
std::swap(future_obtained,other.future_obtained);
}
bool valid() const BOOST_NOEXCEPT
{
return task.get()!=0;
}
// result retrieval
BOOST_THREAD_FUTURE<R> get_future()
{
if(!task)
{
boost::throw_exception(task_moved());
}
else if(!future_obtained)
{
future_obtained=true;
return BOOST_THREAD_FUTURE<R>(task);
}
else
{
boost::throw_exception(future_already_retrieved());
}
//return BOOST_THREAD_FUTURE<R>();
}
// execution
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK && defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
void operator()(BOOST_THREAD_RV_REF(ArgTypes)... args)
{
if(!task)
{
boost::throw_exception(task_moved());
}
task->run(boost::forward<ArgTypes>(args)...);
}
void make_ready_at_thread_exit(ArgTypes... args)
{
if(!task)
{
boost::throw_exception(task_moved());
}
if (task->has_value())
{
boost::throw_exception(promise_already_satisfied());
}
task->apply(boost::forward<ArgTypes>(args)...);
}
#else
void operator()()
{
if(!task)
{
boost::throw_exception(task_moved());
}
task->run();
}
void make_ready_at_thread_exit()
{
if(!task)
{
boost::throw_exception(task_moved());
}
if (task->has_value())
boost::throw_exception(promise_already_satisfied());
task->apply();
}
#endif
template<typename F>
void set_wait_callback(F f)
{
task->set_wait_callback(f,this);
}
};
#if defined BOOST_THREAD_PROVIDES_FUTURE_CTOR_ALLOCATORS
namespace container
{
template <class R, class Alloc>
struct uses_allocator<packaged_task<R>, Alloc>
: public true_type {};
}
#endif
BOOST_THREAD_DCL_MOVABLE_BEG(T) packaged_task<T> BOOST_THREAD_DCL_MOVABLE_END
namespace detail
{
////////////////////////////////
// make_future_deferred_object
////////////////////////////////
template <class Rp, class Fp>
BOOST_THREAD_FUTURE<Rp>
make_future_deferred_object(BOOST_THREAD_FWD_REF(Fp) f)
{
shared_ptr<future_deferred_object<Rp, Fp> >
h(new future_deferred_object<Rp, Fp>(boost::forward<Fp>(f)));
return BOOST_THREAD_FUTURE<Rp>(h);
}
////////////////////////////////
// make_future_async_object
////////////////////////////////
template <class Rp, class Fp>
BOOST_THREAD_FUTURE<Rp>
make_future_async_object(BOOST_THREAD_FWD_REF(Fp) f)
{
shared_ptr<future_async_object<Rp, Fp> >
h(new future_async_object<Rp, Fp>(boost::forward<Fp>(f)));
return BOOST_THREAD_FUTURE<Rp>(h);
}
}
////////////////////////////////
// template <class F, class... ArgTypes>
// future<R> async(F&&, ArgTypes&&...);
////////////////////////////////
#if defined BOOST_THREAD_RVALUE_REFERENCES_DONT_MATCH_FUNTION_PTR
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK
#if defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
template <class R, class... ArgTypes>
BOOST_THREAD_FUTURE<R>
async(launch policy, R(*f)(BOOST_THREAD_FWD_REF(ArgTypes)...), BOOST_THREAD_FWD_REF(ArgTypes)... args)
{
//typedef packaged_task<R(BOOST_THREAD_FWD_REF(ArgTypes)...)> packaged_task_type;
typedef packaged_task<R(ArgTypes...)> packaged_task_type;
#else
template <class R>
BOOST_THREAD_FUTURE<R>
async(launch policy, R(*f)())
{
typedef packaged_task<R()> packaged_task_type;
#endif
#else
template <class R>
BOOST_THREAD_FUTURE<R>
async(launch policy, R(*f)())
{
typedef packaged_task<R> packaged_task_type;
#endif
if (int(policy) & int(launch::async))
{
packaged_task_type pt( f );
BOOST_THREAD_FUTURE<R> ret = pt.get_future();
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK && defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
boost::thread( boost::move(pt), boost::forward<ArgTypes>(args)... ).detach();
#else
boost::thread( boost::move(pt) ).detach();
#endif
return ::boost::move(ret);
}
else if (int(policy) & int(launch::deferred))
{
packaged_task_type pt( f );
BOOST_THREAD_FUTURE<R> ret = pt.get_future();
return ::boost::move(ret);
} else {
BOOST_THREAD_FUTURE<R> ret;
return ::boost::move(ret);
}
}
template <class R>
BOOST_THREAD_FUTURE<R>
async(R(*f)())
{
return BOOST_THREAD_MAKE_RV_REF(async(launch(launch::any), f));
}
#endif
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK
#if defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
template <class F, class ...ArgTypes>
BOOST_THREAD_FUTURE<typename boost::result_of<typename decay<F>::type(
typename decay<ArgTypes>::type...
)>::type>
async(launch policy, BOOST_THREAD_FWD_REF(F) f, BOOST_THREAD_FWD_REF(ArgTypes)... args)
{
typedef typename boost::result_of<typename decay<F>::type(
typename decay<ArgTypes>::type...
)>::type R;
typedef packaged_task<R(ArgTypes...)> packaged_task_type;
typedef detail::async_func<typename decay<F>::type, typename decay<ArgTypes>::type...> BF;
typedef typename BF::result_type Rp;
#else
template <class F>
BOOST_THREAD_FUTURE<typename boost::result_of<typename decay<F>::type()>::type>
async(launch policy, BOOST_THREAD_FWD_REF(F) f)
{
typedef typename boost::result_of<typename decay<F>::type()>::type R;
typedef packaged_task<R()> packaged_task_type;
typedef detail::async_func<typename decay<F>::type> BF;
typedef typename BF::result_type Rp;
#endif
#else
template <class F>
BOOST_THREAD_FUTURE<typename boost::result_of<typename decay<F>::type()>::type>
async(launch policy, BOOST_THREAD_FWD_REF(F) f)
{
typedef typename boost::result_of<typename decay<F>::type()>::type R;
typedef packaged_task<R> packaged_task_type;
typedef detail::async_func<typename decay<F>::type> BF;
typedef typename BF::result_type Rp;
#endif
if (int(policy) & int(launch::async))
{
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK && defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
return boost::detail::make_future_async_object<Rp>(
BF(
thread_detail::decay_copy(boost::forward<F>(f))
, thread_detail::decay_copy(boost::forward<ArgTypes>(args))...
)
);
#else
packaged_task_type pt( boost::forward<F>(f) );
BOOST_THREAD_FUTURE<R> ret = pt.get_future();
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK && defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
boost::thread( boost::move(pt), boost::forward<ArgTypes>(args)... ).detach(); // todo forward
#else
boost::thread( boost::move(pt) ).detach();
#endif
return ::boost::move(ret);
#endif
}
else if (int(policy) & int(launch::deferred))
{
#if defined BOOST_THREAD_PROVIDES_SIGNATURE_PACKAGED_TASK && defined(BOOST_THREAD_PROVIDES_VARIADIC_THREAD)
return boost::detail::make_future_deferred_object<Rp>(
BF(
thread_detail::decay_copy(boost::forward<F>(f))
, thread_detail::decay_copy(boost::forward<ArgTypes>(args))...
)
);
#else
BOOST_THREAD_FUTURE<R> ret;
return ::boost::move(ret);
// return boost::detail::make_future_deferred_object<Rp>(
// BF(
// thread_detail::decay_copy(boost::forward<F>(f))
// )
// );
#endif
} else {
BOOST_THREAD_FUTURE<R> ret;
return ::boost::move(ret);
}
}
template <class F>
BOOST_THREAD_FUTURE<typename boost::result_of<F()>::type>
async(BOOST_THREAD_RV_REF(F) f)
{
return async(launch(launch::any), boost::forward<F>(f));
}
////////////////////////////////
// make_future
////////////////////////////////
template <typename T>
BOOST_THREAD_FUTURE<typename decay<T>::type> make_future(BOOST_THREAD_FWD_REF(T) value)
{
typedef typename decay<T>::type future_type;
promise<future_type> p;
p.set_value(boost::forward<T>(value));
return p.get_future();
}
inline BOOST_THREAD_FUTURE<void> make_future()
{
promise<void> p;
return p.get_future();
}
////////////////////////////////
// make_shared_future
////////////////////////////////
template <typename T>
shared_future<typename decay<T>::type> make_shared_future(BOOST_THREAD_FWD_REF(T) value)
{
typedef typename decay<T>::type future_type;
promise<future_type> p;
p.set_value(boost::forward<T>(value));
return p.get_future().share();
}
inline shared_future<void> make_shared_future()
{
promise<void> p;
return p.get_future().share();
}
////////////////////////////////
// detail::future_continuation
////////////////////////////////
#if defined BOOST_THREAD_PROVIDES_FUTURE_CONTINUATION
namespace detail
{
template <typename F, typename R, typename C>
struct future_continuation : future_continuation_base
{
F& parent;
C continuation;
launch policy_;
promise<R> next;
future_continuation(F& f, BOOST_THREAD_FWD_REF(C) c) :
parent(f),
continuation(boost::forward<C>(c)),
policy_(f.launch_policy()),
next()
{}
future_continuation(F& f, BOOST_THREAD_FWD_REF(C) c, launch policy) :
parent(f),
continuation(boost::forward<C>(c)),
policy_(policy),
next()
{}
~future_continuation()
{}
void do_continuation(boost::unique_lock<boost::mutex>& lk)
{
try
{
lk.unlock();
// fixme what to do depending on inherits_launch_policy_ and policy_?
// if (int(policy_) & int(launch::deferred))
{
R val = continuation(parent);
next.set_value(boost::move(val));
}
// else
// {
// BOOST_THREAD_FUTURE<R> f = async(policy_, continuation, boost::ref(parent));
// R val = f.get();
// next.set_value(boost::move(val));
// }
}
catch (...)
{
next.set_exception(boost::current_exception());
}
}
private:
future_continuation(future_continuation const&);
future_continuation& operator=(future_continuation const&);
};
#if defined(BOOST_THREAD_RVALUE_REFERENCES_DONT_MATCH_FUNTION_PTR)
template <typename F, typename R, typename CR>
struct future_continuation<F,R,CR(*)(F&)> : future_continuation_base
{
F& parent;
CR(*continuation)(F&) ;
launch policy_;
promise<R> next;
future_continuation(F& f, CR(*c)(F&)) :
parent(f),
continuation(c),
policy_(f.launch_policy()),
next()
{}
future_continuation(F& f, CR(*c)(F&), launch policy) :
parent(f),
continuation(c),
policy_(policy),
next()
{}
~future_continuation()
{}
void do_continuation(boost::unique_lock<boost::mutex>& lk)
{
try
{
lk.unlock();
// fixme what to do depending on inherits_launch_policy_ and policy_?
// if (int(policy_) & int(launch::deferred))
{
R val = continuation(parent);
next.set_value(boost::move(val));
}
// else
// {
// BOOST_THREAD_FUTURE<R> f = async(policy_, continuation, boost::ref(parent));
// R val = f.get();
// next.set_value(boost::move(val));
// }
}
catch (...)
{
next.set_exception(boost::current_exception());
}
}
private:
future_continuation(future_continuation const&);
future_continuation& operator=(future_continuation const&);
};
#endif
}
////////////////////////////////
// template<typename F>
// auto future<R>::then(F&& func) -> BOOST_THREAD_FUTURE<decltype(func(*this))>;
////////////////////////////////
template <typename R>
template <typename F>
inline BOOST_THREAD_FUTURE<typename boost::result_of<F(BOOST_THREAD_FUTURE<R>&)>::type>
BOOST_THREAD_FUTURE<R>::then(launch policy, BOOST_THREAD_RV_REF(F) func)
{
typedef typename boost::result_of<F(BOOST_THREAD_FUTURE<R>&)>::type future_type;
if (this->future_)
{
boost::unique_lock<boost::mutex> lock(this->future_->mutex);
detail::future_continuation<BOOST_THREAD_FUTURE<R>, future_type, F > *ptr =
new detail::future_continuation<BOOST_THREAD_FUTURE<R>, future_type, F>(*this, boost::forward<F>(func), policy);
if (ptr==0)
{
return BOOST_THREAD_FUTURE<future_type>();
}
this->future_->set_continuation_ptr(ptr, lock);
return ptr->next.get_future();
}
else
{
// fixme what to do when the future has no associated state?
return BOOST_THREAD_FUTURE<future_type>();
}
}
template <typename R>
template <typename F>
inline BOOST_THREAD_FUTURE<typename boost::result_of<F(BOOST_THREAD_FUTURE<R>&)>::type>
BOOST_THREAD_FUTURE<R>::then(BOOST_THREAD_RV_REF(F) func)
{
typedef typename boost::result_of<F(BOOST_THREAD_FUTURE<R>&)>::type future_type;
if (this->future_)
{
boost::unique_lock<boost::mutex> lock(this->future_->mutex);
detail::future_continuation<BOOST_THREAD_FUTURE<R>, future_type, F > *ptr =
new detail::future_continuation<BOOST_THREAD_FUTURE<R>, future_type, F>(*this, boost::forward<F>(func));
if (ptr==0)
{
return BOOST_THREAD_FUTURE<future_type>();
}
this->future_->set_continuation_ptr(ptr, lock);
return ptr->next.get_future();
} else {
// fixme what to do when the future has no associated state?
return BOOST_THREAD_FUTURE<future_type>();
}
}
#if defined(BOOST_THREAD_RVALUE_REFERENCES_DONT_MATCH_FUNTION_PTR)
template <typename R>
template<typename RF>
BOOST_THREAD_FUTURE<RF>
BOOST_THREAD_FUTURE<R>::then(RF(*func)(BOOST_THREAD_FUTURE<R>&))
{
typedef RF future_type;
if (this->future_)
{
boost::unique_lock<boost::mutex> lock(this->future_->mutex);
detail::future_continuation<BOOST_THREAD_FUTURE<R>, future_type, RF(*)(BOOST_THREAD_FUTURE&) > *ptr =
new detail::future_continuation<BOOST_THREAD_FUTURE<R>, future_type, RF(*)(BOOST_THREAD_FUTURE&)>(*this, func);
if (ptr==0)
{
return BOOST_THREAD_FUTURE<future_type>();
}
this->future_->set_continuation_ptr(ptr, lock);
return ptr->next.get_future();
} else {
// fixme what to do when the future has no associated state?
return BOOST_THREAD_FUTURE<future_type>();
}
}
template <typename R>
template<typename RF>
BOOST_THREAD_FUTURE<RF>
BOOST_THREAD_FUTURE<R>::then(launch policy, RF(*func)(BOOST_THREAD_FUTURE<R>&))
{
typedef RF future_type;
if (this->future_)
{
boost::unique_lock<boost::mutex> lock(this->future_->mutex);
detail::future_continuation<BOOST_THREAD_FUTURE<R>, future_type, RF(*)(BOOST_THREAD_FUTURE&) > *ptr =
new detail::future_continuation<BOOST_THREAD_FUTURE<R>, future_type, RF(*)(BOOST_THREAD_FUTURE&)>(*this, func, policy);
if (ptr==0)
{
return BOOST_THREAD_FUTURE<future_type>();
}
this->future_->set_continuation_ptr(ptr, lock);
return ptr->next.get_future();
} else {
// fixme what to do when the future has no associated state?
return BOOST_THREAD_FUTURE<future_type>();
}
}
#endif
#endif
}
#endif // BOOST_NO_EXCEPTION
#endif // header
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