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// **********************************************************************
//
// Copyright (c) 2003-2008 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/RecMutex.h>
#include <IceUtil/Exception.h>
using namespace std;
#ifdef _WIN32
IceUtil::RecMutex::RecMutex() :
_count(0)
{
InitializeCriticalSection(&_mutex);
}
IceUtil::RecMutex::~RecMutex()
{
assert(_count == 0);
DeleteCriticalSection(&_mutex);
}
void
IceUtil::RecMutex::lock() const
{
EnterCriticalSection(&_mutex);
if(++_count > 1)
{
LeaveCriticalSection(&_mutex);
}
}
bool
IceUtil::RecMutex::tryLock() const
{
if(!TryEnterCriticalSection(&_mutex))
{
return false;
}
if(++_count > 1)
{
LeaveCriticalSection(&_mutex);
}
return true;
}
void
IceUtil::RecMutex::unlock() const
{
if(--_count == 0)
{
LeaveCriticalSection(&_mutex);
}
}
void
IceUtil::RecMutex::unlock(LockState& state) const
{
state.count = _count;
_count = 0;
LeaveCriticalSection(&_mutex);
}
void
IceUtil::RecMutex::lock(LockState& state) const
{
EnterCriticalSection(&_mutex);
_count = state.count;
}
#else
IceUtil::RecMutex::RecMutex() :
_count(0)
{
int rc;
#if defined(__linux) && !defined(__USE_UNIX98)
const pthread_mutexattr_t attr = { PTHREAD_MUTEX_RECURSIVE_NP };
#else
pthread_mutexattr_t attr;
rc = pthread_mutexattr_init(&attr);
if(rc != 0)
{
throw ThreadSyscallException(__FILE__, __LINE__, rc);
}
rc = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
if(rc != 0)
{
throw ThreadSyscallException(__FILE__, __LINE__, rc);
}
#endif
rc = pthread_mutex_init(&_mutex, &attr);
if(rc != 0)
{
throw ThreadSyscallException(__FILE__, __LINE__, rc);
}
#if defined(__linux) && !defined(__USE_UNIX98)
// Nothing to do
#else
rc = pthread_mutexattr_destroy(&attr);
if(rc != 0)
{
throw ThreadSyscallException(__FILE__, __LINE__, rc);
}
#endif
}
IceUtil::RecMutex::~RecMutex()
{
assert(_count == 0);
int rc = 0;
rc = pthread_mutex_destroy(&_mutex);
assert(rc == 0);
}
void
IceUtil::RecMutex::lock() const
{
int rc = pthread_mutex_lock(&_mutex);
if(rc != 0)
{
throw ThreadSyscallException(__FILE__, __LINE__, rc);
}
if(++_count > 1)
{
rc = pthread_mutex_unlock(&_mutex);
assert(rc == 0);
}
}
bool
IceUtil::RecMutex::tryLock() const
{
int rc = pthread_mutex_trylock(&_mutex);
bool result = (rc == 0);
if(!result)
{
if(rc != EBUSY)
{
throw ThreadSyscallException(__FILE__, __LINE__, rc);
}
}
else if(++_count > 1)
{
rc = pthread_mutex_unlock(&_mutex);
if(rc != 0)
{
throw ThreadSyscallException(__FILE__, __LINE__, rc);
}
}
return result;
}
void
IceUtil::RecMutex::unlock() const
{
if(--_count == 0)
{
int rc = 0; // Prevent warnings when NDEBUG is defined.
rc = pthread_mutex_unlock(&_mutex);
assert(rc == 0);
}
}
void
IceUtil::RecMutex::unlock(LockState& state) const
{
state.mutex = &_mutex;
state.count = _count;
_count = 0;
}
void
IceUtil::RecMutex::lock(LockState& state) const
{
_count = state.count;
}
#endif
bool
IceUtil::RecMutex::willUnlock() const
{
return _count == 1;
}
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