Atomics overhaul.

include/core/SkThread.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_DEFINED
 #define SkThread_DEFINED
 
-#include "SkTypes.h"
-
-// SkAtomics.h must provide inline implementations for the following declarations.
-
-/** Atomically adds one to the int referenced by addr and returns the previous value.
- *  No additional memory barrier is required; this must act as a compiler barrier.
- */
-static int32_t sk_atomic_inc(int32_t* addr);
-static int64_t sk_atomic_inc(int64_t* addr);
-
-/** Atomically adds inc to the int referenced by addr and returns the previous value.
- *  No additional memory barrier is required; this must act as a compiler barrier.
- */
-static int32_t sk_atomic_add(int32_t* addr, int32_t inc);
-
-/** Atomically subtracts one from the int referenced by addr and returns the previous value.
- *  This must act as a release (SL/S) memory barrier and as a compiler barrier.
- */
-static int32_t sk_atomic_dec(int32_t* addr);
-
-/** Atomic compare and set.
- *  If *addr == before, set *addr to after and return true, otherwise return false.
- *  This must act as a release (SL/S) memory barrier and as a compiler barrier.
- */
-static bool sk_atomic_cas(int32_t* addr, int32_t before, int32_t after);
-
-/** If sk_atomic_dec does not act as an acquire (L/SL) barrier,
- *  this must act as an acquire (L/SL) memory barrier and as a compiler barrier.
- */
-static void sk_membar_acquire__after_atomic_dec();
-
-/** If sk_atomic_conditional_inc does not act as an acquire (L/SL) barrier,
- *  this must act as an acquire (L/SL) memory barrier and as a compiler barrier.
- */
-static void sk_membar_acquire__after_atomic_conditional_inc();
+// TODO: delete this file, or maybe move the definition of SkThread here.
 
 #include "SkAtomics.h"
-
-/** Atomically adds one to the int referenced by addr iff the referenced int was not 0
- *  and returns the previous value.
- *  No additional memory barrier is required; this must act as a compiler barrier.
- */
-template<typename INT_TYPE> static inline INT_TYPE sk_atomic_conditional_inc(INT_TYPE* addr) {
-    INT_TYPE prev;
-    do {
-        prev = *addr;
-        if (0 == prev) {
-            break;
-        }
-    } while (!sk_atomic_cas(addr, prev, prev+1));
-    return prev;
-}
-
-// SkBarriers.h must provide implementations for the following declarations:
-
-/** Prevent the compiler from reordering across this barrier. */
-static void sk_compiler_barrier();
-
-/** Read T*, with at least an acquire barrier.
- *
- *  Only needs to be implemented for T which can be atomically read.
- */
-template <typename T> T sk_acquire_load(T*);
-
-/** Write T*, with at least a release barrier.
- *
- *  Only needs to be implemented for T which can be atomically written.
- */
-template <typename T> void sk_release_store(T*, T);
-
-#include "SkBarriers.h"
-
-/** SkMutex.h must provide the following (or equivalent) declarations.
-
-class SkBaseMutex {
-public:
-    void acquire();     // Block until this thread owns the mutex.
-    void release();     // Assuming this thread owns the mutex, release it.
-    void assertHeld();  // If SK_DEBUG, assert this thread owns the mutex.
-};
-
-class SkMutex : SkBaseMutex {
-public:
-    SkMutex();
-    ~SkMutex();
-};
-
-#define SK_DECLARE_STATIC_MUTEX(name) static SkBaseMutex name = ...
-*/
-
 #include "SkMutex.h"
 
-class SkAutoMutexAcquire : SkNoncopyable {
-public:
-    explicit SkAutoMutexAcquire(SkBaseMutex& mutex) : fMutex(&mutex) {
-        SkASSERT(fMutex != NULL);
-        mutex.acquire();
-    }
-
-    explicit SkAutoMutexAcquire(SkBaseMutex* mutex) : fMutex(mutex) {
-        if (mutex) {
-            mutex->acquire();
-        }
-    }
-
-    /** If the mutex has not been released, release it now. */
-    ~SkAutoMutexAcquire() {
-        if (fMutex) {
-            fMutex->release();
-        }
-    }
-
-    /** If the mutex has not been released, release it now. */
-    void release() {
-        if (fMutex) {
-            fMutex->release();
-            fMutex = NULL;
-        }
-    }
-
-    /** Assert that we're holding the mutex. */
-    void assertHeld() {
-        SkASSERT(fMutex);
-        fMutex->assertHeld();
-    }
-
-private:
-    SkBaseMutex* fMutex;
-};
-#define SkAutoMutexAcquire(...) SK_REQUIRE_LOCAL_VAR(SkAutoMutexAcquire)
-
 #endif