[NaCl SDK] gtest_ppapi library.

native_client_sdk/src/libraries/c_salt/threading/thread_condition.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 THREAD_CONDITION_H_
-#define THREAD_CONDITION_H_
-
-#include "c_salt/threading/pthread_ext.h"
-
-struct timespec;
-
-namespace c_salt {
-namespace threading {
-// A wrapper class for condition signaling.  Contains a mutex and condition
-// pair.
-class ThreadCondition {
- public:
-  // Initialize the mutex and the condition.
-  ThreadCondition() {
-    pthread_mutex_init(&cond_mutex_, NULL);
-    pthread_cond_init(&condition_, NULL);
-  }
-
-  virtual ~ThreadCondition() {
-    pthread_cond_destroy(&condition_);
-    pthread_mutex_destroy(&cond_mutex_);
-  }
-
-  // Lock the mutex, do this before signalling the condition.
-  void Lock() {
-    pthread_mutex_lock(&cond_mutex_);
-  }
-
-  // Unlock the mutex, do this after raising a signal or after returning from
-  // Wait().
-  void Unlock() {
-    pthread_mutex_unlock(&cond_mutex_);
-  }
-
-  // Signal the condition.  This will cause Wait() to return.
-  void Signal() {
-    pthread_cond_broadcast(&condition_);
-  }
-
-  // Wait for a Signal().  Note that this can spuriously return, so you should
-  // have a guard bool to see if the condtion is really true.  E.g., in the
-  // calling thread:
-  //   cond_lock->Lock();
-  //   cond_true = true;
-  //   cond_lock->Signal();
-  //   cond_lock->Unlock();
-  // In the worker thread:
-  //   cond_lock->Lock();
-  //   while (!cond_true) {
-  //     cond_lock->Wait();
-  //   }
-  //   cond_lock->Unlock();
-  void Wait() {
-    pthread_cond_wait(&condition_, &cond_mutex_);
-  }
-
-  // Same as Wait, but wait at most until abs_time. Returns false if the system
-  // time exceeds abs_time before the condition is signaled.
-  bool TimedWait(struct timespec *abs_time) {
-    return (pthread_cond_timedwait(&condition_, &cond_mutex_, abs_time) == 0);
-  }
-
- private:
-  pthread_mutex_t cond_mutex_;
-  pthread_cond_t condition_;
-};
-}  // namespace threading
-}  // namespace c_salt
-
-#endif  // THREAD_CONDITION_H_
-