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// Copyright 2017 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef STARBOARD_SHARED_WIN32_ATOMIC_QUEUE_H_
#define STARBOARD_SHARED_WIN32_ATOMIC_QUEUE_H_
#include <deque>
#include "starboard/common/mutex.h"
namespace starboard {
namespace shared {
namespace win32 {
// A simple thread-safe producer / consumer queue. Elements are added via
// PopBack() and removed via PopFront().
template <typename Data>
class AtomicQueue {
public:
size_t PushBack(Data data_ptr) {
ScopedLock lock(mutex_);
data_queue_.push_back(data_ptr);
return data_queue_.size();
}
Data PopFront() {
ScopedLock lock(mutex_);
if (data_queue_.empty()) {
Data empty = Data();
return empty;
}
Data data_ptr = data_queue_.front();
data_queue_.pop_front();
return data_ptr;
}
bool IsEmpty() const {
ScopedLock lock(mutex_);
return data_queue_.empty();
}
size_t Size() const {
ScopedLock lock(mutex_);
return data_queue_.size();
}
void Clear() {
ScopedLock lock(mutex_);
std::deque<Data> empty;
data_queue_.swap(empty);
}
private:
using Mutex = ::starboard::Mutex;
using ScopedLock = ::starboard::ScopedLock;
std::deque<Data> data_queue_;
::starboard::Mutex mutex_;
};
} // namespace win32
} // namespace shared
} // namespace starboard
#endif // STARBOARD_SHARED_WIN32_ATOMIC_QUEUE_H_