1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/ports/SkMutex_pthread.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,87 @@
1.4 +/*
1.5 + * Copyright 2013 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 SkMutex_pthread_DEFINED
1.12 +#define SkMutex_pthread_DEFINED
1.13 +
1.14 +/** Posix pthread_mutex based mutex. */
1.15 +
1.16 +#ifdef SK_DEBUG_PTHREAD_MUTEX
1.17 +#include "SkTypes.h"
1.18 +#define SkDEBUGCODE_PTHREAD_MUTEX(code) code
1.19 +#else
1.20 +#define SkDEBUGCODE_PTHREAD_MUTEX(code)
1.21 +#ifndef SkDebugf
1.22 + void SkDebugf(const char format[], ...);
1.23 +#endif
1.24 +#endif
1.25 +
1.26 +#include <errno.h>
1.27 +#include <pthread.h>
1.28 +
1.29 +// A SkBaseMutex is a POD structure that can be directly initialized
1.30 +// at declaration time with SK_DECLARE_STATIC/GLOBAL_MUTEX. This avoids the
1.31 +// generation of a static initializer in the final machine code (and
1.32 +// a corresponding static finalizer).
1.33 +struct SkBaseMutex {
1.34 + void acquire() { pthread_mutex_lock(&fMutex); }
1.35 + void release() { pthread_mutex_unlock(&fMutex); }
1.36 + pthread_mutex_t fMutex;
1.37 +};
1.38 +
1.39 +// A normal mutex that requires to be initialized through normal C++ construction,
1.40 +// i.e. when it's a member of another class, or allocated on the heap.
1.41 +class SkMutex : public SkBaseMutex {
1.42 +public:
1.43 + SkMutex() {
1.44 + SkDEBUGCODE_PTHREAD_MUTEX(int status = )pthread_mutex_init(&fMutex, NULL);
1.45 + SkDEBUGCODE_PTHREAD_MUTEX(
1.46 + if (status != 0) {
1.47 + print_pthread_error(status);
1.48 + SkASSERT(0 == status);
1.49 + }
1.50 + )
1.51 + }
1.52 +
1.53 + ~SkMutex() {
1.54 + SkDEBUGCODE_PTHREAD_MUTEX(int status = )pthread_mutex_destroy(&fMutex);
1.55 + SkDEBUGCODE_PTHREAD_MUTEX(
1.56 + if (status != 0) {
1.57 + print_pthread_error(status);
1.58 + SkASSERT(0 == status);
1.59 + }
1.60 + )
1.61 + }
1.62 +
1.63 +private:
1.64 + SkMutex(const SkMutex&);
1.65 + SkMutex& operator=(const SkMutex&);
1.66 +
1.67 + static void print_pthread_error(int status) {
1.68 + switch (status) {
1.69 + case 0: // success
1.70 + break;
1.71 + case EINVAL:
1.72 + SkDebugf("pthread error [%d] EINVAL\n", status);
1.73 + break;
1.74 + case EBUSY:
1.75 + SkDebugf("pthread error [%d] EBUSY\n", status);
1.76 + break;
1.77 + default:
1.78 + SkDebugf("pthread error [%d] unknown\n", status);
1.79 + break;
1.80 + }
1.81 + }
1.82 +};
1.83 +
1.84 +// Using POD-style initialization prevents the generation of a static initializer.
1.85 +#define SK_DECLARE_STATIC_MUTEX(name) static SkBaseMutex name = { PTHREAD_MUTEX_INITIALIZER }
1.86 +
1.87 +// Special case used when the static mutex must be available globally.
1.88 +#define SK_DECLARE_GLOBAL_MUTEX(name) SkBaseMutex name = { PTHREAD_MUTEX_INITIALIZER }
1.89 +
1.90 +#endif
