e63793a2c8
Review URL: https://codereview.appspot.com/5752055 git-svn-id: http://skia.googlecode.com/svn/trunk@3449 2bbb7eff-a529-9590-31e7-b0007b416f81
116 lines
3.2 KiB
C++
116 lines
3.2 KiB
C++
|
|
/*
|
|
* 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
|