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/*
* Copyright 2006 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkThread_platform_DEFINED
#define SkThread_platform_DEFINED
#if defined(SK_BUILD_FOR_ANDROID)
#if defined(SK_BUILD_FOR_ANDROID_NDK)
#include <stdint.h>
/* Just use the GCC atomic intrinsics. They're supported by the NDK toolchain,
* have reasonable performance, and provide full memory barriers
*/
static __attribute__((always_inline)) int32_t sk_atomic_inc(int32_t *addr) {
return __sync_fetch_and_add(addr, 1);
}
static __attribute__((always_inline)) int32_t sk_atomic_dec(int32_t *addr) {
return __sync_fetch_and_add(addr, -1);
}
#else // !SK_BUILD_FOR_ANDROID_NDK
/* The platform atomics operations are slightly more efficient than the
* GCC built-ins, so use them.
*/
#include <utils/Atomic.h>
#define sk_atomic_inc(addr) android_atomic_inc(addr)
#define sk_atomic_dec(addr) android_atomic_dec(addr)
#endif // !SK_BUILD_FOR_ANDROID_NDK
#else // !SK_BUILD_FOR_ANDROID
/** Implemented by the porting layer, this function adds 1 to the int specified
by the address (in a thread-safe manner), and returns the previous value.
*/
SK_API int32_t sk_atomic_inc(int32_t* addr);
/** Implemented by the porting layer, this function subtracts 1 to the int
specified by the address (in a thread-safe manner), and returns the previous
value.
*/
SK_API int32_t sk_atomic_dec(int32_t* addr);
#endif // !SK_BUILD_FOR_ANDROID
#ifdef SK_USE_POSIX_THREADS
#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;
};
// Using POD-style initialization prevents the generation of a static initializer
// and keeps the acquire() implementation small and fast.
#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 }
// 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, SkNoncopyable {
public:
SkMutex();
~SkMutex();
};
#else // !SK_USE_POSIX_THREADS
// In the generic case, SkBaseMutex and SkMutex are the same thing, and we
// can't easily get rid of static initializers.
//
class SkMutex : SkNoncopyable {
public:
SkMutex();
~SkMutex();
void acquire();
void release();
private:
bool fIsGlobal;
enum {
kStorageIntCount = 64
};
uint32_t fStorage[kStorageIntCount];
};
typedef SkMutex SkBaseMutex;
#define SK_DECLARE_STATIC_MUTEX(name) static SkBaseMutex name
#define SK_DECLARE_GLOBAL_MUTEX(name) SkBaseMutex name
#endif // !SK_USE_POSIX_THREADS
#endif
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