chromium/third_party/libgav1/src/src/utils/blocking_counter.h

/*
 * Copyright 2019 The libgav1 Authors
 *
 * 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 LIBGAV1_SRC_UTILS_BLOCKING_COUNTER_H_
#define LIBGAV1_SRC_UTILS_BLOCKING_COUNTER_H_

#include <cassert>
#include <condition_variable>  // NOLINT (unapproved c++11 header)
#include <mutex>               // NOLINT (unapproved c++11 header)

#include "src/utils/compiler_attributes.h"

namespace libgav1 {

// Implementation of a Blocking Counter that is used for the "fork-join"
// use case. Typical usage would be as follows:
//   BlockingCounter counter(num_jobs);
//     - spawn the jobs.
//     - call counter.Wait() on the master thread.
//     - worker threads will call counter.Decrement().
//     - master thread will return from counter.Wait() when all workers are
//     complete.
template <bool has_failure_status>
class BlockingCounterImpl { … };

BlockingCounterWithStatus;
BlockingCounter;

}  // namespace libgav1

#endif  // LIBGAV1_SRC_UTILS_BLOCKING_COUNTER_H_