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69 lines
1.5 KiB
C++
69 lines
1.5 KiB
C++
/*
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* Copyright 2012 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkCondVar_DEFINED
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#define SkCondVar_DEFINED
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#ifdef SK_USE_POSIX_THREADS
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#include <pthread.h>
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#elif defined(SK_BUILD_FOR_WIN32)
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#include <windows.h>
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#endif
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/**
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* Condition variable for blocking access to shared data from other threads and
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* controlling which threads are awake.
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*
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* Currently only supported on platforms with posix threads and Windows Vista and
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* above.
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*/
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class SkCondVar {
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public:
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SkCondVar();
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~SkCondVar();
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/**
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* Lock a mutex. Must be done before calling the other functions on this object.
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*/
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void lock();
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/**
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* Unlock the mutex.
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*/
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void unlock();
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/**
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* Pause the calling thread. Will be awoken when signal() or broadcast() is called.
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* Must be called while lock() is held (but gives it up while waiting). Once awoken,
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* the calling thread will hold the lock once again.
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*/
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void wait();
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/**
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* Wake one thread waiting on this condition. Must be called while lock()
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* is held.
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*/
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void signal();
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/**
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* Wake all threads waiting on this condition. Must be called while lock()
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* is held.
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*/
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void broadcast();
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private:
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#ifdef SK_USE_POSIX_THREADS
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pthread_mutex_t fMutex;
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pthread_cond_t fCond;
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#elif defined(SK_BUILD_FOR_WIN32)
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CRITICAL_SECTION fCriticalSection;
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CONDITION_VARIABLE fCondition;
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#endif
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};
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#endif
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