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      1 
      2 /*
      3  * Copyright 2006 The Android Open Source Project
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 
      9 
     10 #ifndef SkThread_DEFINED
     11 #define SkThread_DEFINED
     12 
     13 #include "SkTypes.h"
     14 #include "SkThread_platform.h"
     15 
     16 /****** SkThread_platform needs to define the following...
     17 
     18 int32_t sk_atomic_inc(int32_t*);
     19 int32_t sk_atomic_add(int32_t*, int32_t);
     20 int32_t sk_atomic_dec(int32_t*);
     21 int32_t sk_atomic_conditional_inc(int32_t*);
     22 
     23 class SkMutex {
     24 public:
     25     SkMutex();
     26     ~SkMutex();
     27 
     28     void    acquire();
     29     void    release();
     30 };
     31 
     32 ****************/
     33 
     34 class SkAutoMutexAcquire : SkNoncopyable {
     35 public:
     36     explicit SkAutoMutexAcquire(SkBaseMutex& mutex) : fMutex(&mutex) {
     37         SkASSERT(fMutex != NULL);
     38         mutex.acquire();
     39     }
     40 
     41     SkAutoMutexAcquire(SkBaseMutex* mutex) : fMutex(mutex) {
     42         if (mutex) {
     43             mutex->acquire();
     44         }
     45     }
     46 
     47     /** If the mutex has not been release, release it now.
     48     */
     49     ~SkAutoMutexAcquire() {
     50         if (fMutex) {
     51             fMutex->release();
     52         }
     53     }
     54 
     55     /** If the mutex has not been release, release it now.
     56     */
     57     void release() {
     58         if (fMutex) {
     59             fMutex->release();
     60             fMutex = NULL;
     61         }
     62     }
     63 
     64 private:
     65     SkBaseMutex* fMutex;
     66 };
     67 #define SkAutoMutexAcquire(...) SK_REQUIRE_LOCAL_VAR(SkAutoMutexAcquire)
     68 
     69 #endif
     70