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// **********************************************************************
//
// Copyright (c) 2003-present ZeroC, Inc. All rights reserved.
//
// **********************************************************************
#include <IceUtil/RecMutex.h>
#include <IceUtil/Exception.h>
using namespace std;
IceUtil::RecMutex::RecMutex() :
_count(0)
{
#ifdef _WIN32
init(PrioNone);
#else
init(getDefaultMutexProtocol());
#endif
}
IceUtil::RecMutex::RecMutex(const IceUtil::MutexProtocol protocol) :
_count(0)
{
init(protocol);
}
#ifdef _WIN32
void
IceUtil::RecMutex::init(const MutexProtocol)
{
# ifdef ICE_OS_UWP
InitializeCriticalSectionEx(&_mutex, 0, 0);
# else
InitializeCriticalSection(&_mutex);
# endif
}
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);
}
}
# ifdef ICE_HAS_WIN32_CONDVAR
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;
}
# else
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;
}
# endif
#else
void
IceUtil::RecMutex::init(ICE_MAYBE_UNUSED const MutexProtocol protocol)
{
int rc;
pthread_mutexattr_t attr;
rc = pthread_mutexattr_init(&attr);
assert(rc == 0);
if(rc != 0)
{
pthread_mutexattr_destroy(&attr);
throw ThreadSyscallException(__FILE__, __LINE__, rc);
}
rc = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
assert(rc == 0);
if(rc != 0)
{
pthread_mutexattr_destroy(&attr);
throw ThreadSyscallException(__FILE__, __LINE__, rc);
}
#if defined(_POSIX_THREAD_PRIO_INHERIT) && _POSIX_THREAD_PRIO_INHERIT > 0
if(PrioInherit == protocol)
{
rc = pthread_mutexattr_setprotocol(&attr, PTHREAD_PRIO_INHERIT);
assert(rc == 0);
if(rc != 0)
{
throw ThreadSyscallException(__FILE__, __LINE__, rc);
}
}
#endif
rc = pthread_mutex_init(&_mutex, &attr);
assert(rc == 0);
if(rc != 0)
{
pthread_mutexattr_destroy(&attr);
throw ThreadSyscallException(__FILE__, __LINE__, rc);
}
rc = pthread_mutexattr_destroy(&attr);
assert(rc == 0);
if(rc != 0)
{
throw ThreadSyscallException(__FILE__, __LINE__, rc);
}
}
IceUtil::RecMutex::~RecMutex()
{
assert(_count == 0);
#ifndef NDEBUG
int rc = pthread_mutex_destroy(&_mutex);
assert(rc == 0);
#else
pthread_mutex_destroy(&_mutex);
#endif
}
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)
{
#ifndef NDEBUG
int rc = pthread_mutex_unlock(&_mutex);
assert(rc == 0);
#else
pthread_mutex_unlock(&_mutex);
#endif
}
}
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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