1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/include/utils/SkCondVar.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,68 @@
1.4 +/*
1.5 + * Copyright 2012 Google Inc.
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license that can be
1.8 + * found in the LICENSE file.
1.9 + */
1.10 +
1.11 +#ifndef SkCondVar_DEFINED
1.12 +#define SkCondVar_DEFINED
1.13 +
1.14 +#ifdef SK_USE_POSIX_THREADS
1.15 +#include <pthread.h>
1.16 +#elif defined(SK_BUILD_FOR_WIN32)
1.17 +#include <windows.h>
1.18 +#endif
1.19 +
1.20 +/**
1.21 + * Condition variable for blocking access to shared data from other threads and
1.22 + * controlling which threads are awake.
1.23 + *
1.24 + * Currently only supported on platforms with posix threads and Windows Vista and
1.25 + * above.
1.26 + */
1.27 +class SkCondVar {
1.28 +public:
1.29 + SkCondVar();
1.30 + ~SkCondVar();
1.31 +
1.32 + /**
1.33 + * Lock a mutex. Must be done before calling the other functions on this object.
1.34 + */
1.35 + void lock();
1.36 +
1.37 + /**
1.38 + * Unlock the mutex.
1.39 + */
1.40 + void unlock();
1.41 +
1.42 + /**
1.43 + * Pause the calling thread. Will be awoken when signal() or broadcast() is called.
1.44 + * Must be called while lock() is held (but gives it up while waiting). Once awoken,
1.45 + * the calling thread will hold the lock once again.
1.46 + */
1.47 + void wait();
1.48 +
1.49 + /**
1.50 + * Wake one thread waiting on this condition. Must be called while lock()
1.51 + * is held.
1.52 + */
1.53 + void signal();
1.54 +
1.55 + /**
1.56 + * Wake all threads waiting on this condition. Must be called while lock()
1.57 + * is held.
1.58 + */
1.59 + void broadcast();
1.60 +
1.61 +private:
1.62 +#ifdef SK_USE_POSIX_THREADS
1.63 + pthread_mutex_t fMutex;
1.64 + pthread_cond_t fCond;
1.65 +#elif defined(SK_BUILD_FOR_WIN32)
1.66 + CRITICAL_SECTION fCriticalSection;
1.67 + CONDITION_VARIABLE fCondition;
1.68 +#endif
1.69 +};
1.70 +
1.71 +#endif
