blob: 2e4d1f34b955f9f231d23a843d25a611df7bfd63 [file] [log] [blame]
// Copyright 2013 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.
//
// This file contains helper classes for video accelerator unittests.
#ifndef MEDIA_GPU_TEST_VIDEO_ACCELERATOR_UNITTEST_HELPERS_H_
#define MEDIA_GPU_TEST_VIDEO_ACCELERATOR_UNITTEST_HELPERS_H_
#include "base/containers/queue.h"
#include "base/synchronization/condition_variable.h"
#include "base/synchronization/lock.h"
namespace media {
namespace test {
// Helper class allowing one thread to wait on a notification from another.
// If notifications come in faster than they are Wait()'d for, they are
// accumulated (so exactly as many Wait() calls will unblock as Notify() calls
// were made, regardless of order).
template <typename StateEnum>
class ClientStateNotification {
public:
ClientStateNotification();
~ClientStateNotification();
// Used to notify a single waiter of a ClientState.
void Notify(StateEnum state);
// Used by waiters to wait for the next ClientState Notification.
StateEnum Wait();
private:
base::Lock lock_;
base::ConditionVariable cv_;
base::queue<StateEnum> pending_states_for_notification_;
};
template <typename StateEnum>
ClientStateNotification<StateEnum>::ClientStateNotification() : cv_(&lock_) {}
template <typename StateEnum>
ClientStateNotification<StateEnum>::~ClientStateNotification() {}
template <typename StateEnum>
void ClientStateNotification<StateEnum>::Notify(StateEnum state) {
base::AutoLock auto_lock(lock_);
pending_states_for_notification_.push(state);
cv_.Signal();
}
template <typename StateEnum>
StateEnum ClientStateNotification<StateEnum>::Wait() {
base::AutoLock auto_lock(lock_);
while (pending_states_for_notification_.empty())
cv_.Wait();
StateEnum ret = pending_states_for_notification_.front();
pending_states_for_notification_.pop();
return ret;
}
} // namespace test
} // namespace media
#endif // MEDIA_GPU_TEST_VIDEO_ACCELERATOR_UNITTEST_HELPERS_H_