280 lines
9.8 KiB
Plaintext
280 lines
9.8 KiB
Plaintext
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#ifndef BOOST_BASIC_TIMED_MUTEX_WIN32_HPP
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#define BOOST_BASIC_TIMED_MUTEX_WIN32_HPP
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// basic_timed_mutex_win32.hpp
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//
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// (C) Copyright 2006-8 Anthony Williams
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// (C) Copyright 2011-2012 Vicente J. Botet Escriba
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//
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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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#include <boost/assert.hpp>
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#include <boost/thread/win32/thread_primitives.hpp>
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#include <boost/thread/win32/interlocked_read.hpp>
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#include <boost/thread/thread_time.hpp>
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#if defined BOOST_THREAD_USES_DATETIME
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#include <boost/thread/xtime.hpp>
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#endif
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#include <boost/detail/interlocked.hpp>
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#ifdef BOOST_THREAD_USES_CHRONO
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#include <boost/chrono/system_clocks.hpp>
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#include <boost/chrono/ceil.hpp>
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#endif
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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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struct basic_timed_mutex
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{
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BOOST_STATIC_CONSTANT(unsigned char,lock_flag_bit=31);
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BOOST_STATIC_CONSTANT(unsigned char,event_set_flag_bit=30);
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BOOST_STATIC_CONSTANT(long,lock_flag_value=1<<lock_flag_bit);
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BOOST_STATIC_CONSTANT(long,event_set_flag_value=1<<event_set_flag_bit);
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long active_count;
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void* event;
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void initialize()
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{
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active_count=0;
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event=0;
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}
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void destroy()
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{
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#ifdef BOOST_MSVC
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#pragma warning(push)
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#pragma warning(disable:4312)
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#endif
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void* const old_event=BOOST_INTERLOCKED_EXCHANGE_POINTER(&event,0);
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#ifdef BOOST_MSVC
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#pragma warning(pop)
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#endif
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if(old_event)
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{
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win32::CloseHandle(old_event);
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}
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}
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bool try_lock() BOOST_NOEXCEPT
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{
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return !win32::interlocked_bit_test_and_set(&active_count,lock_flag_bit);
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}
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void lock()
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{
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if(try_lock())
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{
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return;
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}
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long old_count=active_count;
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mark_waiting_and_try_lock(old_count);
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if(old_count&lock_flag_value)
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{
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bool lock_acquired=false;
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void* const sem=get_event();
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do
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{
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unsigned const retval(win32::WaitForSingleObjectEx(sem, ::boost::detail::win32::infinite,0));
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BOOST_VERIFY(0 == retval || ::boost::detail::win32::wait_abandoned == retval);
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// BOOST_VERIFY(win32::WaitForSingleObject(
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// sem,::boost::detail::win32::infinite)==0);
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clear_waiting_and_try_lock(old_count);
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lock_acquired=!(old_count&lock_flag_value);
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}
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while(!lock_acquired);
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}
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}
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void mark_waiting_and_try_lock(long& old_count)
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{
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for(;;)
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{
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bool const was_locked=(old_count&lock_flag_value) ? true : false;
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long const new_count=was_locked?(old_count+1):(old_count|lock_flag_value);
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long const current=BOOST_INTERLOCKED_COMPARE_EXCHANGE(&active_count,new_count,old_count);
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if(current==old_count)
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{
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if(was_locked)
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old_count=new_count;
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break;
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}
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old_count=current;
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}
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}
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void clear_waiting_and_try_lock(long& old_count)
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{
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old_count&=~lock_flag_value;
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old_count|=event_set_flag_value;
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for(;;)
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{
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long const new_count=((old_count&lock_flag_value)?old_count:((old_count-1)|lock_flag_value))&~event_set_flag_value;
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long const current=BOOST_INTERLOCKED_COMPARE_EXCHANGE(&active_count,new_count,old_count);
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if(current==old_count)
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{
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break;
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}
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old_count=current;
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}
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}
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#if defined BOOST_THREAD_USES_DATETIME
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bool timed_lock(::boost::system_time const& wait_until)
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{
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if(try_lock())
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{
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return true;
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}
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long old_count=active_count;
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mark_waiting_and_try_lock(old_count);
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if(old_count&lock_flag_value)
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{
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bool lock_acquired=false;
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void* const sem=get_event();
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do
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{
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if(win32::WaitForSingleObjectEx(sem,::boost::detail::get_milliseconds_until(wait_until),0)!=0)
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{
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BOOST_INTERLOCKED_DECREMENT(&active_count);
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return false;
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}
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clear_waiting_and_try_lock(old_count);
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lock_acquired=!(old_count&lock_flag_value);
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}
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while(!lock_acquired);
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}
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return true;
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}
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template<typename Duration>
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bool timed_lock(Duration const& timeout)
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{
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return timed_lock(get_system_time()+timeout);
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}
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bool timed_lock(boost::xtime const& timeout)
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{
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return timed_lock(system_time(timeout));
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}
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#endif
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#ifdef BOOST_THREAD_USES_CHRONO
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template <class Rep, class Period>
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bool try_lock_for(const chrono::duration<Rep, Period>& rel_time)
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{
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return try_lock_until(chrono::steady_clock::now() + rel_time);
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}
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template <class Clock, class Duration>
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bool try_lock_until(const chrono::time_point<Clock, Duration>& t)
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{
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using namespace chrono;
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system_clock::time_point s_now = system_clock::now();
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typename Clock::time_point c_now = Clock::now();
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return try_lock_until(s_now + ceil<system_clock::duration>(t - c_now));
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}
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template <class Duration>
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bool try_lock_until(const chrono::time_point<chrono::system_clock, Duration>& t)
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{
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using namespace chrono;
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typedef time_point<chrono::system_clock, chrono::system_clock::duration> sys_tmpt;
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return try_lock_until(sys_tmpt(chrono::ceil<chrono::system_clock::duration>(t.time_since_epoch())));
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}
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bool try_lock_until(const chrono::time_point<chrono::system_clock, chrono::system_clock::duration>& tp)
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{
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if(try_lock())
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{
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return true;
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}
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long old_count=active_count;
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mark_waiting_and_try_lock(old_count);
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if(old_count&lock_flag_value)
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{
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bool lock_acquired=false;
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void* const sem=get_event();
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do
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{
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chrono::time_point<chrono::system_clock, chrono::system_clock::duration> now = chrono::system_clock::now();
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if (tp<=now) {
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BOOST_INTERLOCKED_DECREMENT(&active_count);
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return false;
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}
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chrono::milliseconds rel_time= chrono::ceil<chrono::milliseconds>(tp-now);
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if(win32::WaitForSingleObjectEx(sem,static_cast<unsigned long>(rel_time.count()),0)!=0)
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{
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BOOST_INTERLOCKED_DECREMENT(&active_count);
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return false;
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}
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clear_waiting_and_try_lock(old_count);
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lock_acquired=!(old_count&lock_flag_value);
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}
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while(!lock_acquired);
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}
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return true;
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}
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#endif
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void unlock()
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{
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long const offset=lock_flag_value;
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long const old_count=BOOST_INTERLOCKED_EXCHANGE_ADD(&active_count,lock_flag_value);
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if(!(old_count&event_set_flag_value) && (old_count>offset))
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{
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if(!win32::interlocked_bit_test_and_set(&active_count,event_set_flag_bit))
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{
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win32::SetEvent(get_event());
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}
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}
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}
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private:
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void* get_event()
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{
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void* current_event=::boost::detail::interlocked_read_acquire(&event);
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if(!current_event)
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{
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void* const new_event=win32::create_anonymous_event(win32::auto_reset_event,win32::event_initially_reset);
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#ifdef BOOST_MSVC
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#pragma warning(push)
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#pragma warning(disable:4311)
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#pragma warning(disable:4312)
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#endif
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void* const old_event=BOOST_INTERLOCKED_COMPARE_EXCHANGE_POINTER(&event,new_event,0);
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#ifdef BOOST_MSVC
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#pragma warning(pop)
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#endif
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if(old_event!=0)
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{
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win32::CloseHandle(new_event);
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return old_event;
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}
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else
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{
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return new_event;
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}
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}
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return current_event;
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}
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};
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}
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}
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#define BOOST_BASIC_TIMED_MUTEX_INITIALIZER {0}
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#include <boost/config/abi_suffix.hpp>
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#endif
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