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// **********************************************************************
//
// Copyright (c) 2003-2010 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
#include <IceUtil/CountDownLatch.h>
#include <IceUtil/ThreadException.h>
IceUtilInternal::CountDownLatch::CountDownLatch(int count) :
_count(count)
{
if(count < 0)
{
throw IceUtil::Exception(__FILE__, __LINE__);
}
#ifdef _WIN32
_event = CreateEvent(0, TRUE, FALSE, 0);
if(_event == 0)
{
throw IceUtil::ThreadSyscallException(__FILE__, __LINE__, GetLastError());
}
#else
int rc = pthread_mutex_init(&_mutex, 0);
if(rc != 0)
{
throw IceUtil::ThreadSyscallException(__FILE__, __LINE__, rc);
}
rc = pthread_cond_init(&_cond, 0);
if(rc != 0)
{
throw IceUtil::ThreadSyscallException(__FILE__, __LINE__, rc);
}
#endif
}
IceUtilInternal::CountDownLatch::~CountDownLatch()
{
#ifdef _WIN32
CloseHandle(_event);
#else
int rc = 0;
rc = pthread_mutex_destroy(&_mutex);
assert(rc == 0);
rc = pthread_cond_destroy(&_cond);
assert(rc == 0);
#endif
}
void
IceUtilInternal::CountDownLatch::await() const
{
#ifdef _WIN32
while(InterlockedExchangeAdd(&_count, 0) > 0)
{
DWORD rc = WaitForSingleObject(_event, INFINITE);
assert(rc == WAIT_OBJECT_0 || rc == WAIT_FAILED);
if(rc == WAIT_FAILED)
{
throw IceUtil::ThreadSyscallException(__FILE__, __LINE__, GetLastError());
}
}
#else
lock();
while(_count > 0)
{
int rc = pthread_cond_wait(&_cond, &_mutex);
if(rc != 0)
{
pthread_mutex_unlock(&_mutex);
throw IceUtil::ThreadSyscallException(__FILE__, __LINE__, rc);
}
}
unlock();
#endif
}
void
IceUtilInternal::CountDownLatch::countDown()
{
#ifdef _WIN32
if(InterlockedDecrement(&_count) == 0)
{
if(SetEvent(_event) == 0)
{
throw IceUtil::ThreadSyscallException(__FILE__, __LINE__, GetLastError());
}
}
#else
bool broadcast = false;
lock();
if(_count > 0 && --_count == 0)
{
broadcast = true;
}
#if defined(__APPLE__)
//
// On MacOS X we do the broadcast with the mutex held. This seems to be necessary to prevent the
// broadcast call to hang (spinning in an infinite loop).
//
if(broadcast)
{
int rc = pthread_cond_broadcast(&_cond);
if(rc != 0)
{
pthread_mutex_unlock(&_mutex);
throw IceUtil::ThreadSyscallException(__FILE__, __LINE__, rc);
}
}
unlock();
#else
unlock();
if(broadcast)
{
int rc = pthread_cond_broadcast(&_cond);
if(rc != 0)
{
throw IceUtil::ThreadSyscallException(__FILE__, __LINE__, rc);
}
}
#endif
#endif
}
int
IceUtilInternal::CountDownLatch::getCount() const
{
#ifdef _WIN32
int count = InterlockedExchangeAdd(&_count, 0);
return count > 0 ? count : 0;
#else
lock();
int result = _count;
unlock();
return result;
#endif
}
#ifndef _WIN32
void
IceUtilInternal::CountDownLatch::lock() const
{
int rc = pthread_mutex_lock(&_mutex);
if(rc != 0)
{
throw IceUtil::ThreadSyscallException(__FILE__, __LINE__, rc);
}
}
void
IceUtilInternal::CountDownLatch::unlock() const
{
int rc = pthread_mutex_unlock(&_mutex);
if(rc != 0)
{
throw IceUtil::ThreadSyscallException(__FILE__, __LINE__, rc);
}
}
#endif
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