419 lines
13 KiB
C++
419 lines
13 KiB
C++
#ifndef BOOST_THREAD_CONDITION_VARIABLE_WIN32_HPP
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#define BOOST_THREAD_CONDITION_VARIABLE_WIN32_HPP
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// (C) Copyright 2007-8 Anthony Williams
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#include <boost/thread/mutex.hpp>
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#include <boost/thread/win32/thread_primitives.hpp>
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#include <limits.h>
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#include <boost/assert.hpp>
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#include <algorithm>
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#include <boost/thread/thread.hpp>
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#include <boost/thread/thread_time.hpp>
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#include <boost/thread/win32/interlocked_read.hpp>
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#include <boost/thread/xtime.hpp>
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#include <vector>
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#include <boost/intrusive_ptr.hpp>
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#include <boost/config/abi_prefix.hpp>
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namespace boost
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{
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namespace detail
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{
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class basic_cv_list_entry;
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void intrusive_ptr_add_ref(basic_cv_list_entry * p);
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void intrusive_ptr_release(basic_cv_list_entry * p);
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class basic_cv_list_entry
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{
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private:
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detail::win32::handle_manager semaphore;
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detail::win32::handle_manager wake_sem;
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long waiters;
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bool notified;
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long references;
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basic_cv_list_entry(basic_cv_list_entry&);
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void operator=(basic_cv_list_entry&);
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public:
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explicit basic_cv_list_entry(detail::win32::handle_manager const& wake_sem_):
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semaphore(detail::win32::create_anonymous_semaphore(0,LONG_MAX)),
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wake_sem(wake_sem_.duplicate()),
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waiters(1),notified(false),references(0)
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{}
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static bool no_waiters(boost::intrusive_ptr<basic_cv_list_entry> const& entry)
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{
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return !detail::interlocked_read_acquire(&entry->waiters);
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}
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void add_waiter()
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{
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BOOST_INTERLOCKED_INCREMENT(&waiters);
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}
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void remove_waiter()
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{
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BOOST_INTERLOCKED_DECREMENT(&waiters);
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}
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void release(unsigned count_to_release)
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{
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notified=true;
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detail::win32::ReleaseSemaphore(semaphore,count_to_release,0);
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}
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void release_waiters()
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{
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release(detail::interlocked_read_acquire(&waiters));
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}
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bool is_notified() const
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{
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return notified;
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}
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bool wait(timeout wait_until)
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{
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return this_thread::interruptible_wait(semaphore,wait_until);
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}
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bool woken()
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{
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unsigned long const woken_result=detail::win32::WaitForSingleObject(wake_sem,0);
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BOOST_ASSERT((woken_result==detail::win32::timeout) || (woken_result==0));
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return woken_result==0;
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}
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friend void intrusive_ptr_add_ref(basic_cv_list_entry * p);
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friend void intrusive_ptr_release(basic_cv_list_entry * p);
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};
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inline void intrusive_ptr_add_ref(basic_cv_list_entry * p)
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{
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BOOST_INTERLOCKED_INCREMENT(&p->references);
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}
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inline void intrusive_ptr_release(basic_cv_list_entry * p)
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{
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if(!BOOST_INTERLOCKED_DECREMENT(&p->references))
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{
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delete p;
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}
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}
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class basic_condition_variable
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{
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boost::mutex internal_mutex;
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long total_count;
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unsigned active_generation_count;
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typedef basic_cv_list_entry list_entry;
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typedef boost::intrusive_ptr<list_entry> entry_ptr;
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typedef std::vector<entry_ptr> generation_list;
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generation_list generations;
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detail::win32::handle_manager wake_sem;
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void wake_waiters(long count_to_wake)
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{
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detail::interlocked_write_release(&total_count,total_count-count_to_wake);
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detail::win32::ReleaseSemaphore(wake_sem,count_to_wake,0);
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}
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template<typename lock_type>
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struct relocker
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{
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lock_type& lock;
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bool unlocked;
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relocker(lock_type& lock_):
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lock(lock_),unlocked(false)
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{}
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void unlock()
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{
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lock.unlock();
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unlocked=true;
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}
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~relocker()
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{
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if(unlocked)
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{
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lock.lock();
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}
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}
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private:
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relocker(relocker&);
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void operator=(relocker&);
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};
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entry_ptr get_wait_entry()
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{
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boost::lock_guard<boost::mutex> internal_lock(internal_mutex);
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if(!wake_sem)
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{
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wake_sem=detail::win32::create_anonymous_semaphore(0,LONG_MAX);
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BOOST_ASSERT(wake_sem);
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}
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detail::interlocked_write_release(&total_count,total_count+1);
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if(generations.empty() || generations.back()->is_notified())
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{
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entry_ptr new_entry(new list_entry(wake_sem));
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generations.push_back(new_entry);
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return new_entry;
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}
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else
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{
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generations.back()->add_waiter();
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return generations.back();
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}
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}
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struct entry_manager
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{
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entry_ptr const entry;
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entry_manager(entry_ptr const& entry_):
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entry(entry_)
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{}
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~entry_manager()
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{
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entry->remove_waiter();
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}
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list_entry* operator->()
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{
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return entry.get();
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}
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private:
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void operator=(entry_manager&);
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entry_manager(entry_manager&);
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};
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protected:
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template<typename lock_type>
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bool do_wait(lock_type& lock,timeout wait_until)
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{
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relocker<lock_type> locker(lock);
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entry_manager entry(get_wait_entry());
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locker.unlock();
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bool woken=false;
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while(!woken)
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{
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if(!entry->wait(wait_until))
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{
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return false;
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}
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woken=entry->woken();
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}
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return woken;
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}
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template<typename lock_type,typename predicate_type>
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bool do_wait(lock_type& m,timeout const& wait_until,predicate_type pred)
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{
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while (!pred())
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{
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if(!do_wait(m, wait_until))
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return pred();
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}
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return true;
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}
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basic_condition_variable(const basic_condition_variable& other);
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basic_condition_variable& operator=(const basic_condition_variable& other);
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public:
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basic_condition_variable():
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total_count(0),active_generation_count(0),wake_sem(0)
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{}
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~basic_condition_variable()
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{}
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void notify_one()
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{
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if(detail::interlocked_read_acquire(&total_count))
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{
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boost::lock_guard<boost::mutex> internal_lock(internal_mutex);
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if(!total_count)
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{
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return;
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}
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wake_waiters(1);
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for(generation_list::iterator it=generations.begin(),
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end=generations.end();
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it!=end;++it)
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{
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(*it)->release(1);
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}
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generations.erase(std::remove_if(generations.begin(),generations.end(),&basic_cv_list_entry::no_waiters),generations.end());
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}
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}
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void notify_all()
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{
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if(detail::interlocked_read_acquire(&total_count))
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{
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boost::lock_guard<boost::mutex> internal_lock(internal_mutex);
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if(!total_count)
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{
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return;
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}
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wake_waiters(total_count);
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for(generation_list::iterator it=generations.begin(),
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end=generations.end();
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it!=end;++it)
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{
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(*it)->release_waiters();
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}
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generations.clear();
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wake_sem=detail::win32::handle(0);
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}
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}
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};
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}
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class condition_variable:
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private detail::basic_condition_variable
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{
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private:
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condition_variable(condition_variable&);
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void operator=(condition_variable&);
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public:
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condition_variable()
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{}
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using detail::basic_condition_variable::notify_one;
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using detail::basic_condition_variable::notify_all;
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void wait(unique_lock<mutex>& m)
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{
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do_wait(m,detail::timeout::sentinel());
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}
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template<typename predicate_type>
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void wait(unique_lock<mutex>& m,predicate_type pred)
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{
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while(!pred()) wait(m);
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}
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bool timed_wait(unique_lock<mutex>& m,boost::system_time const& wait_until)
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{
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return do_wait(m,wait_until);
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}
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bool timed_wait(unique_lock<mutex>& m,boost::xtime const& wait_until)
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{
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return do_wait(m,system_time(wait_until));
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}
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template<typename duration_type>
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bool timed_wait(unique_lock<mutex>& m,duration_type const& wait_duration)
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{
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return do_wait(m,wait_duration.total_milliseconds());
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}
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template<typename predicate_type>
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bool timed_wait(unique_lock<mutex>& m,boost::system_time const& wait_until,predicate_type pred)
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{
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return do_wait(m,wait_until,pred);
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}
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template<typename predicate_type>
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bool timed_wait(unique_lock<mutex>& m,boost::xtime const& wait_until,predicate_type pred)
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{
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return do_wait(m,system_time(wait_until),pred);
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}
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template<typename duration_type,typename predicate_type>
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bool timed_wait(unique_lock<mutex>& m,duration_type const& wait_duration,predicate_type pred)
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{
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return do_wait(m,wait_duration.total_milliseconds(),pred);
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}
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};
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class condition_variable_any:
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private detail::basic_condition_variable
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{
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private:
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condition_variable_any(condition_variable_any&);
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void operator=(condition_variable_any&);
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public:
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condition_variable_any()
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{}
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using detail::basic_condition_variable::notify_one;
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using detail::basic_condition_variable::notify_all;
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template<typename lock_type>
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void wait(lock_type& m)
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{
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do_wait(m,detail::timeout::sentinel());
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}
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template<typename lock_type,typename predicate_type>
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void wait(lock_type& m,predicate_type pred)
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{
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while(!pred()) wait(m);
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}
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template<typename lock_type>
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bool timed_wait(lock_type& m,boost::system_time const& wait_until)
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{
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return do_wait(m,wait_until);
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}
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template<typename lock_type>
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bool timed_wait(lock_type& m,boost::xtime const& wait_until)
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{
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return do_wait(m,system_time(wait_until));
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}
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template<typename lock_type,typename duration_type>
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bool timed_wait(lock_type& m,duration_type const& wait_duration)
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{
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return do_wait(m,wait_duration.total_milliseconds());
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}
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template<typename lock_type,typename predicate_type>
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bool timed_wait(lock_type& m,boost::system_time const& wait_until,predicate_type pred)
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{
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return do_wait(m,wait_until,pred);
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}
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template<typename lock_type,typename predicate_type>
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bool timed_wait(lock_type& m,boost::xtime const& wait_until,predicate_type pred)
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{
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return do_wait(m,system_time(wait_until),pred);
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}
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template<typename lock_type,typename duration_type,typename predicate_type>
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bool timed_wait(lock_type& m,duration_type const& wait_duration,predicate_type pred)
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{
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return do_wait(m,wait_duration.total_milliseconds(),pred);
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}
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};
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}
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#include <boost/config/abi_suffix.hpp>
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#endif
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