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