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/*
*
* Copyright (c) 2004
* John Maddock
*
* Use, modification and distribution are subject to 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)
*
*/
/*
* LOCATION: see http://www.boost.org for most recent version.
* FILE static_mutex.cpp
* VERSION see <boost/version.hpp>
* DESCRIPTION: Declares static_mutex lock type.
*/
#define BOOST_REGEX_SOURCE
#include <boost/config.hpp>
#include <boost/assert.hpp>
#ifdef BOOST_HAS_THREADS
#include <boost/regex/pending/static_mutex.hpp>
#if defined(BOOST_HAS_WINTHREADS)
#ifndef NOMINMAX
# define NOMINMAX
#endif
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <boost/static_assert.hpp>
#endif
namespace boost{
#if defined(BOOST_HAS_PTHREADS) && defined(PTHREAD_MUTEX_INITIALIZER)
scoped_static_mutex_lock::scoped_static_mutex_lock(static_mutex& m, bool lk)
: m_mutex(m), m_have_lock(false)
{
if(lk)
lock();
}
scoped_static_mutex_lock::~scoped_static_mutex_lock()
{
if(m_have_lock)
unlock();
}
void scoped_static_mutex_lock::lock()
{
if(0 == m_have_lock)
{
// Client code will throw if this fails:
m_have_lock = (pthread_mutex_lock(&(m_mutex.m_mutex)) == 0);
}
}
void scoped_static_mutex_lock::unlock()
{
if(m_have_lock)
{
// If this fails there's nothing we can do except assert,
// exceptions are out of the question as this code is called
// from the lock's destructor:
BOOST_VERIFY(pthread_mutex_unlock(&(m_mutex.m_mutex)) == 0);
m_have_lock = false;
}
}
#elif defined(BOOST_HAS_WINTHREADS)
BOOST_STATIC_ASSERT(sizeof(LONG) == sizeof(boost::int32_t));
scoped_static_mutex_lock::scoped_static_mutex_lock(static_mutex& m, bool lk)
: m_mutex(m), m_have_lock(false)
{
if(lk)
lock();
}
scoped_static_mutex_lock::~scoped_static_mutex_lock()
{
if(m_have_lock)
unlock();
}
void scoped_static_mutex_lock::lock()
{
if(0 == m_have_lock)
{
#if !defined(InterlockedCompareExchangePointer)
while(0 != InterlockedCompareExchange(reinterpret_cast<void**>((boost::uint_least16_t*)&(m_mutex.m_mutex)), (void*)1, 0))
#else
while(0 != InterlockedCompareExchange(reinterpret_cast<LONG*>(&(m_mutex.m_mutex)), 1, 0))
#endif
{
Sleep(0);
}
m_have_lock = true;
}
}
void scoped_static_mutex_lock::unlock()
{
if(m_have_lock)
{
#if !defined(InterlockedCompareExchangePointer)
InterlockedExchange((LONG*)&(m_mutex.m_mutex), 0);
#else
InterlockedExchange(reinterpret_cast<LONG*>(&(m_mutex.m_mutex)), 0);
#endif
m_have_lock = false;
}
}
#else
//
// Portable version of a static mutex based on Boost.Thread library:
//
#include <stdlib.h>
#include <boost/assert.hpp>
boost::recursive_mutex* static_mutex::m_pmutex = 0;
boost::once_flag static_mutex::m_once = BOOST_ONCE_INIT;
extern "C" BOOST_REGEX_DECL void boost_regex_free_static_mutex()
{
delete static_mutex::m_pmutex;
static_mutex::m_pmutex = 0;
}
void static_mutex::init()
{
m_pmutex = new boost::recursive_mutex();
int r = atexit(boost_regex_free_static_mutex);
BOOST_ASSERT(0 == r);
}
scoped_static_mutex_lock::scoped_static_mutex_lock(static_mutex& , bool lk)
: m_plock(0), m_have_lock(false)
{
if(lk)
lock();
}
scoped_static_mutex_lock::~scoped_static_mutex_lock()
{
if(m_have_lock)
unlock();
delete m_plock;
}
void scoped_static_mutex_lock::lock()
{
if(0 == m_have_lock)
{
boost::call_once(static_mutex::m_once,&static_mutex::init);
if(0 == m_plock)
m_plock = new boost::unique_lock<boost::recursive_mutex>(*static_mutex::m_pmutex, boost::defer_lock);
m_plock->lock();
m_have_lock = true;
}
}
void scoped_static_mutex_lock::unlock()
{
if(m_have_lock)
{
m_plock->unlock();
m_have_lock = false;
}
}
#endif
}
#endif // BOOST_HAS_THREADS
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