Split atomic and mutex implementations and make inlinable.

include/core/SkThread_platform.h

-
-/*
- * 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_FRAMEWORK)
-
-#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 inline __attribute__((always_inline)) int32_t sk_atomic_inc(int32_t *addr) {
-    return __sync_fetch_and_add(addr, 1);
-}
-
-static inline __attribute__((always_inline)) int32_t sk_atomic_add(int32_t *addr, int32_t inc) {
-    return __sync_fetch_and_add(addr, inc);
-}
-
-static inline __attribute__((always_inline)) int32_t sk_atomic_dec(int32_t *addr) {
-    return __sync_fetch_and_add(addr, -1);
-}
-static inline __attribute__((always_inline)) void sk_membar_aquire__after_atomic_dec() { }
-
-static inline __attribute__((always_inline)) int32_t sk_atomic_conditional_inc(int32_t* addr) {
-    int32_t value = *addr;
-
-    while (true) {
-        if (value == 0) {
-            return 0;
-        }
-
-        int32_t before = __sync_val_compare_and_swap(addr, value, value + 1);
-
-        if (before == value) {
-            return value;
-        } else {
-            value = before;
-        }
-    }
-}
-static inline __attribute__((always_inline)) void sk_membar_aquire__after_atomic_conditional_inc() { }
-
-#else // SK_BUILD_FOR_ANDROID_FRAMEWORK
-
-/* 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_add(addr, inc)    android_atomic_add(inc, addr)
-#define sk_atomic_dec(addr)         android_atomic_dec(addr)
-
-static inline __attribute__((always_inline)) void sk_membar_aquire__after_atomic_dec() {
-    //HACK: Android is actually using full memory barriers.
-    //      Should this change, uncomment below.
-    //int dummy;
-    //android_atomic_aquire_store(0, &dummy);
-}
-static inline __attribute__((always_inline)) int32_t sk_atomic_conditional_inc(int32_t* addr) {
-    while (true) {
-        int32_t value = *addr;
-        if (value == 0) {
-            return 0;
-        }
-        if (0 == android_atomic_release_cas(value, value + 1, addr)) {
-            return value;
-        }
-    }
-}
-static inline __attribute__((always_inline)) void sk_membar_aquire__after_atomic_conditional_inc() {
-    //HACK: Android is actually using full memory barriers.
-    //      Should this change, uncomment below.
-    //int dummy;
-    //android_atomic_aquire_store(0, &dummy);
-}
-
-#endif // SK_BUILD_FOR_ANDROID_FRAMEWORK
-
-#else  // !SK_BUILD_FOR_ANDROID
-
-/** Implemented by the porting layer, this function adds one to the int
-    specified by the address (in a thread-safe manner), and returns the
-    previous value.
-    No additional memory barrier is required.
-    This must act as a compiler barrier.
-*/
-SK_API int32_t sk_atomic_inc(int32_t* addr);
-
-/** Implemented by the porting layer, this function adds inc to the int
-    specified by the address (in a thread-safe manner), and returns the
-    previous value.
-    No additional memory barrier is required.
-    This must act as a compiler barrier.
- */
-SK_API int32_t sk_atomic_add(int32_t* addr, int32_t inc);
-
-/** Implemented by the porting layer, this function subtracts one from the int
-    specified by the address (in a thread-safe manner), and returns the
-    previous value.
-    Expected to act as a release (SL/S) memory barrier and a compiler barrier.
-*/
-SK_API int32_t sk_atomic_dec(int32_t* addr);
-/** If sk_atomic_dec does not act as an aquire (L/SL) barrier, this is expected
-    to act as an aquire (L/SL) memory barrier and as a compiler barrier.
-*/
-SK_API void sk_membar_aquire__after_atomic_dec();
-
-/** Implemented by the porting layer, this function adds one to the int
-    specified by the address iff the int specified by the address is not zero
-    (in a thread-safe manner), and returns the previous value.
-    No additional memory barrier is required.
-    This must act as a compiler barrier.
-*/
-SK_API int32_t sk_atomic_conditional_inc(int32_t*);
-/** If sk_atomic_conditional_inc does not act as an aquire (L/SL) barrier, this
-    is expected to act as an aquire (L/SL) memory barrier and as a compiler
-    barrier.
-*/
-SK_API void sk_membar_aquire__after_atomic_conditional_inc();
-
-#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 SK_API 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 SK_API 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