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// **********************************************************************
//
// Copyright (c) 2003
// ZeroC, Inc.
// Billerica, MA, USA
//
// All Rights Reserved.
//
// Ice is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License version 2 as published by
// the Free Software Foundation.
//
// **********************************************************************
#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);
}
bool
IceUtil::RecMutex::lock() const
{
EnterCriticalSection(&_mutex);
if(++_count > 1)
{
LeaveCriticalSection(&_mutex);
return false;
}
return true;
}
bool
IceUtil::RecMutex::trylock() const
{
if(!TryEnterCriticalSection(&_mutex))
{
throw ThreadLockedException(__FILE__, __LINE__);
}
if(++_count > 1)
{
LeaveCriticalSection(&_mutex);
return false;
}
return true;
}
bool
IceUtil::RecMutex::unlock() const
{
if(--_count == 0)
{
LeaveCriticalSection(&_mutex);
return true;
}
return false;
}
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)
{
pthread_mutexattr_t attr;
int rc = pthread_mutexattr_init(&attr);
if(rc != 0)
{
throw ThreadSyscallException(__FILE__, __LINE__);
}
rc = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
if(rc != 0)
{
throw ThreadSyscallException(__FILE__, __LINE__);
}
rc = pthread_mutex_init(&_mutex, &attr);
if(rc != 0)
{
throw ThreadSyscallException(__FILE__, __LINE__);
}
/*
#ifdef __linux__
const pthread_mutexattr_t attr = { PTHREAD_MUTEX_RECURSIVE_NP };
#else
const pthread_mutexattr_t attr = { PTHREAD_MUTEX_RECURSIVE };
#endif
int rc = pthread_mutex_init(&_mutex, &attr);
if(rc != 0)
{
throw ThreadSyscallException(__FILE__, __LINE__);
}
*/
}
IceUtil::RecMutex::~RecMutex()
{
assert(_count == 0);
int rc = 0;
rc = pthread_mutex_destroy(&_mutex);
assert(rc == 0);
}
bool
IceUtil::RecMutex::lock() const
{
int rc = pthread_mutex_lock(&_mutex);
if(rc != 0)
{
throw ThreadSyscallException(__FILE__, __LINE__);
}
if(++_count > 1)
{
rc = pthread_mutex_unlock(&_mutex);
assert(rc == 0);
return false;
}
return true;
}
bool
IceUtil::RecMutex::trylock() const
{
int rc = pthread_mutex_trylock(&_mutex);
if(rc != 0)
{
if(rc == EBUSY)
{
throw ThreadLockedException(__FILE__, __LINE__);
}
throw ThreadSyscallException(__FILE__, __LINE__);
}
if(++_count > 1)
{
rc = pthread_mutex_unlock(&_mutex);
assert(rc == 0);
return false;
}
return true;
}
bool
IceUtil::RecMutex::unlock() const
{
if(--_count == 0)
{
int rc = 0; // Prevent warnings when NDEBUG is defined.
rc = pthread_mutex_unlock(&_mutex);
assert(rc == 0);
return true;
}
return false;
}
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
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