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/**
* @file llmutex.h
* @brief Base classes for mutex and condition handling.
*
* $LicenseInfo:firstyear=2004&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2012, 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
* $/LicenseInfo$
*/
#ifndef LL_LLMUTEX_H
#define LL_LLMUTEX_H
#include "llapr.h"
#include "apr_thread_cond.h"
//============================================================================
#define MUTEX_DEBUG (LL_DEBUG || LL_RELEASE_WITH_DEBUG_INFO)
class LL_COMMON_API LLMutex
{
public:
typedef enum
{
NO_THREAD = 0xFFFFFFFF
} e_locking_thread;
LLMutex(apr_pool_t *apr_poolp = NULL); // NULL pool constructs a new pool for the mutex
virtual ~LLMutex();
void lock(); // blocks
void unlock();
bool isLocked(); // non-blocking, but does do a lock/unlock so not free
bool isSelfLocked(); //return true if locked in a same thread
U32 lockingThread() const; //get ID of locking thread
protected:
apr_thread_mutex_t *mAPRMutexp;
mutable U32 mCount;
mutable U32 mLockingThread;
apr_pool_t *mAPRPoolp;
BOOL mIsLocalPool;
#if MUTEX_DEBUG
std::map<U32, BOOL> mIsLocked;
#endif
};
// Actually a condition/mutex pair (since each condition needs to be associated with a mutex).
class LL_COMMON_API LLCondition : public LLMutex
{
public:
LLCondition(apr_pool_t *apr_poolp); // Defaults to global pool, could use the thread pool as well.
~LLCondition();
void wait(); // blocks
void signal();
void broadcast();
protected:
apr_thread_cond_t *mAPRCondp;
};
class LLMutexLock
{
public:
LLMutexLock(LLMutex* mutex)
{
mMutex = mutex;
if(mMutex)
mMutex->lock();
}
~LLMutexLock()
{
if(mMutex)
mMutex->unlock();
}
private:
LLMutex* mMutex;
};
//============================================================================
// see llmemory.h for LLPointer<> definition
class LL_COMMON_API LLThreadSafeRefCount
{
public:
static void initThreadSafeRefCount(); // creates sMutex
static void cleanupThreadSafeRefCount(); // destroys sMutex
private:
static LLMutex* sMutex;
private:
LLThreadSafeRefCount(const LLThreadSafeRefCount&); // not implemented
LLThreadSafeRefCount&operator=(const LLThreadSafeRefCount&); // not implemented
protected:
virtual ~LLThreadSafeRefCount(); // use unref()
public:
LLThreadSafeRefCount();
void ref()
{
if (sMutex) sMutex->lock();
mRef++;
if (sMutex) sMutex->unlock();
}
S32 unref()
{
llassert(mRef >= 1);
if (sMutex) sMutex->lock();
S32 res = --mRef;
if (sMutex) sMutex->unlock();
if (0 == res)
{
delete this;
return 0;
}
return res;
}
S32 getNumRefs() const
{
return mRef;
}
private:
S32 mRef;
};
//============================================================================
// Simple responder for self destructing callbacks
// Pure virtual class
class LL_COMMON_API LLResponder : public LLThreadSafeRefCount
{
protected:
virtual ~LLResponder();
public:
virtual void completed(bool success) = 0;
};
#endif // LL_LLTHREAD_H
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