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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkMutex_pthread_DEFINED
#define SkMutex_pthread_DEFINED
/** Posix pthread_mutex based mutex. */
#ifdef SK_DEBUG_PTHREAD_MUTEX
#include "SkTypes.h"
#define SkDEBUGCODE_PTHREAD_MUTEX(code) code
#else
#define SkDEBUGCODE_PTHREAD_MUTEX(code)
#ifndef SkDebugf
void SkDebugf(const char format[], ...);
#endif
#endif
#include <errno.h>
#include <pthread.h>
// A SkBaseMutex is a POD structure that can be directly initialized
// at declaration time with SK_DECLARE_STATIC/GLOBAL_MUTEX. This avoids the
// generation of a static initializer in the final machine code (and
// a corresponding static finalizer).
struct SkBaseMutex {
void acquire() { pthread_mutex_lock(&fMutex); }
void release() { pthread_mutex_unlock(&fMutex); }
pthread_mutex_t fMutex;
};
// A normal mutex that requires to be initialized through normal C++ construction,
// i.e. when it's a member of another class, or allocated on the heap.
class SkMutex : public SkBaseMutex {
public:
SkMutex() {
SkDEBUGCODE_PTHREAD_MUTEX(int status = )pthread_mutex_init(&fMutex, NULL);
SkDEBUGCODE_PTHREAD_MUTEX(
if (status != 0) {
print_pthread_error(status);
SkASSERT(0 == status);
}
)
}
~SkMutex() {
SkDEBUGCODE_PTHREAD_MUTEX(int status = )pthread_mutex_destroy(&fMutex);
SkDEBUGCODE_PTHREAD_MUTEX(
if (status != 0) {
print_pthread_error(status);
SkASSERT(0 == status);
}
)
}
private:
SkMutex(const SkMutex&);
SkMutex& operator=(const SkMutex&);
static void print_pthread_error(int status) {
switch (status) {
case 0: // success
break;
case EINVAL:
SkDebugf("pthread error [%d] EINVAL\n", status);
break;
case EBUSY:
SkDebugf("pthread error [%d] EBUSY\n", status);
break;
default:
SkDebugf("pthread error [%d] unknown\n", status);
break;
}
}
};
// Using POD-style initialization prevents the generation of a static initializer.
#define SK_DECLARE_STATIC_MUTEX(name) static SkBaseMutex name = { PTHREAD_MUTEX_INITIALIZER }
// Special case used when the static mutex must be available globally.
#define SK_DECLARE_GLOBAL_MUTEX(name) SkBaseMutex name = { PTHREAD_MUTEX_INITIALIZER }
#endif
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