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/**
* @file llmutex.cpp
*
* $LicenseInfo:firstyear=2004&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#include "linden_common.h"
#include "llapr.h"
#include "apr_portable.h"
#include "llmutex.h"
#include "llthread.h"
//============================================================================
LLMutex::LLMutex(apr_pool_t *poolp) :
mAPRMutexp(NULL), mCount(0), mLockingThread(NO_THREAD)
{
//if (poolp)
//{
// mIsLocalPool = FALSE;
// mAPRPoolp = poolp;
//}
//else
{
mIsLocalPool = TRUE;
apr_pool_create(&mAPRPoolp, NULL); // Create a subpool for this thread
}
apr_thread_mutex_create(&mAPRMutexp, APR_THREAD_MUTEX_UNNESTED, mAPRPoolp);
}
LLMutex::~LLMutex()
{
#if MUTEX_DEBUG
//bad assertion, the subclass LLSignal might be "locked", and that's OK
//llassert_always(!isLocked()); // better not be locked!
#endif
if (ll_apr_is_initialized())
{
apr_thread_mutex_destroy(mAPRMutexp);
if (mIsLocalPool)
{
apr_pool_destroy(mAPRPoolp);
}
}
mAPRMutexp = NULL;
}
void LLMutex::lock()
{
if(isSelfLocked())
{ //redundant lock
mCount++;
return;
}
apr_thread_mutex_lock(mAPRMutexp);
#if MUTEX_DEBUG
// Have to have the lock before we can access the debug info
U32 id = LLThread::currentID();
if (mIsLocked[id] != FALSE)
LL_ERRS() << "Already locked in Thread: " << id << LL_ENDL;
mIsLocked[id] = TRUE;
#endif
mLockingThread = LLThread::currentID();
}
void LLMutex::unlock()
{
if (mCount > 0)
{ //not the root unlock
mCount--;
return;
}
#if MUTEX_DEBUG
// Access the debug info while we have the lock
U32 id = LLThread::currentID();
if (mIsLocked[id] != TRUE)
LL_ERRS() << "Not locked in Thread: " << id << LL_ENDL;
mIsLocked[id] = FALSE;
#endif
mLockingThread = NO_THREAD;
apr_thread_mutex_unlock(mAPRMutexp);
}
bool LLMutex::isLocked()
{
apr_status_t status = apr_thread_mutex_trylock(mAPRMutexp);
if (APR_STATUS_IS_EBUSY(status))
{
return true;
}
else
{
apr_thread_mutex_unlock(mAPRMutexp);
return false;
}
}
bool LLMutex::isSelfLocked()
{
return mLockingThread == LLThread::currentID();
}
U32 LLMutex::lockingThread() const
{
return mLockingThread;
}
bool LLMutex::trylock()
{
if(isSelfLocked())
{ //redundant lock
mCount++;
return true;
}
apr_status_t status(apr_thread_mutex_trylock(mAPRMutexp));
if (APR_STATUS_IS_EBUSY(status))
{
return false;
}
#if MUTEX_DEBUG
// Have to have the lock before we can access the debug info
U32 id = LLThread::currentID();
if (mIsLocked[id] != FALSE)
LL_ERRS() << "Already locked in Thread: " << id << LL_ENDL;
mIsLocked[id] = TRUE;
#endif
mLockingThread = LLThread::currentID();
return true;
}
//============================================================================
LLCondition::LLCondition(apr_pool_t *poolp) :
LLMutex(poolp)
{
// base class (LLMutex) has already ensured that mAPRPoolp is set up.
apr_thread_cond_create(&mAPRCondp, mAPRPoolp);
}
LLCondition::~LLCondition()
{
apr_thread_cond_destroy(mAPRCondp);
mAPRCondp = NULL;
}
void LLCondition::wait()
{
if (!isLocked())
{ //mAPRMutexp MUST be locked before calling apr_thread_cond_wait
apr_thread_mutex_lock(mAPRMutexp);
#if MUTEX_DEBUG
// avoid asserts on destruction in non-release builds
U32 id = LLThread::currentID();
mIsLocked[id] = TRUE;
#endif
}
apr_thread_cond_wait(mAPRCondp, mAPRMutexp);
}
void LLCondition::signal()
{
apr_thread_cond_signal(mAPRCondp);
}
void LLCondition::broadcast()
{
apr_thread_cond_broadcast(mAPRCondp);
}
//============================================================================
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