[NaCl SDK] gtest_ppapi library.

native_client_sdk/src/libraries/c_salt/threading/ref_count.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-#ifndef REF_COUNT_H_
-#define REF_COUNT_H_
-
-#include "c_salt/threading/pthread_ext.h"
-
-namespace threading {
-
-// A thread-safe reference counter for class CompletionCallbackFactory.
-class RefCount {
- public:
-  RefCount() : ref_(0) {
-    pthread_mutex_init(&mutex_, NULL);
-  }
-  ~RefCount() {
-    pthread_mutex_destroy(&mutex_);
-  }
-
-  int32_t AddRef() {
-    int32_t ret_val = 0;
-    if (pthread_mutex_lock(&mutex_) == PTHREAD_MUTEX_SUCCESS) {
-      ret_val = ++ref_;
-      pthread_mutex_unlock(&mutex_);
-    }
-    return ret_val;
-  }
-
-  int32_t Release() {
-    int32_t ret_val = -1;
-    if (pthread_mutex_lock(&mutex_) == PTHREAD_MUTEX_SUCCESS) {
-      ret_val = --ref_;
-      pthread_mutex_unlock(&mutex_);
-    }
-    return ret_val;
-  }
-
- private:
-  int32_t ref_;
-  pthread_mutex_t mutex_;
-};
-
-}  // namespace threading
-#endif  // REF_COUNT_H_
-