105 lines
2.5 KiB
C++
105 lines
2.5 KiB
C++
/**
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* @file llmutex.h
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* @brief Base classes for mutex and condition handling.
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*
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* $LicenseInfo:firstyear=2004&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2012, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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#ifndef LL_LLMUTEX_H
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#define LL_LLMUTEX_H
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#include "stdtypes.h"
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//============================================================================
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#define MUTEX_DEBUG (LL_DEBUG || LL_RELEASE_WITH_DEBUG_INFO)
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struct apr_thread_mutex_t;
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struct apr_pool_t;
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struct apr_thread_cond_t;
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class LL_COMMON_API LLMutex
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{
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public:
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typedef enum
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{
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NO_THREAD = 0xFFFFFFFF
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} e_locking_thread;
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LLMutex(apr_pool_t *apr_poolp = NULL); // NULL pool constructs a new pool for the mutex
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virtual ~LLMutex();
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void lock(); // blocks
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void unlock();
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bool isLocked(); // non-blocking, but does do a lock/unlock so not free
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bool isSelfLocked(); //return true if locked in a same thread
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U32 lockingThread() const; //get ID of locking thread
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protected:
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apr_thread_mutex_t* mAPRMutexp;
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mutable U32 mCount;
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mutable U32 mLockingThread;
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apr_pool_t* mAPRPoolp;
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BOOL mIsLocalPool;
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#if MUTEX_DEBUG
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std::map<U32, BOOL> mIsLocked;
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#endif
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};
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// Actually a condition/mutex pair (since each condition needs to be associated with a mutex).
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class LL_COMMON_API LLCondition : public LLMutex
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{
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public:
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LLCondition(apr_pool_t* apr_poolp); // Defaults to global pool, could use the thread pool as well.
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~LLCondition();
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void wait(); // blocks
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void signal();
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void broadcast();
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protected:
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apr_thread_cond_t* mAPRCondp;
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};
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class LLMutexLock
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{
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public:
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LLMutexLock(LLMutex* mutex)
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{
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mMutex = mutex;
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if(mMutex)
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mMutex->lock();
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}
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~LLMutexLock()
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{
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if(mMutex)
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mMutex->unlock();
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}
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private:
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LLMutex* mMutex;
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};
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#endif // LL_LLTHREAD_H
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