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-//
-// Copyright 2017 The Abseil 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
-//
-//      https://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.
-//
-// -----------------------------------------------------------------------------
-// blocking_counter.h
-// -----------------------------------------------------------------------------
-
-#ifndef ABSL_SYNCHRONIZATION_BLOCKING_COUNTER_H_
-#define ABSL_SYNCHRONIZATION_BLOCKING_COUNTER_H_
-
-#include "absl/base/thread_annotations.h"
-#include "absl/synchronization/mutex.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-
-// BlockingCounter
-//
-// This class allows a thread to block for a pre-specified number of actions.
-// `BlockingCounter` maintains a single non-negative abstract integer "count"
-// with an initial value `initial_count`. A thread can then call `Wait()` on
-// this blocking counter to block until the specified number of events occur;
-// worker threads then call 'DecrementCount()` on the counter upon completion of
-// their work. Once the counter's internal "count" reaches zero, the blocked
-// thread unblocks.
-//
-// A `BlockingCounter` requires the following:
-//     - its `initial_count` is non-negative.
-//     - the number of calls to `DecrementCount()` on it is at most
-//       `initial_count`.
-//     - `Wait()` is called at most once on it.
-//
-// Given the above requirements, a `BlockingCounter` provides the following
-// guarantees:
-//     - Once its internal "count" reaches zero, no legal action on the object
-//       can further change the value of "count".
-//     - When `Wait()` returns, it is legal to destroy the `BlockingCounter`.
-//     - When `Wait()` returns, the number of calls to `DecrementCount()` on
-//       this blocking counter exactly equals `initial_count`.
-//
-// Example:
-//     BlockingCounter bcount(N);         // there are N items of work
-//     ... Allow worker threads to start.
-//     ... On completing each work item, workers do:
-//     ... bcount.DecrementCount();      // an item of work has been completed
-//
-//     bcount.Wait();                    // wait for all work to be complete
-//
-class BlockingCounter {
- public:
-  explicit BlockingCounter(int initial_count)
-      : count_(initial_count), num_waiting_(0) {}
-
-  BlockingCounter(const BlockingCounter&) = delete;
-  BlockingCounter& operator=(const BlockingCounter&) = delete;
-
-  // BlockingCounter::DecrementCount()
-  //
-  // Decrements the counter's "count" by one, and return "count == 0". This
-  // function requires that "count != 0" when it is called.
-  //
-  // Memory ordering: For any threads X and Y, any action taken by X
-  // before it calls `DecrementCount()` is visible to thread Y after
-  // Y's call to `DecrementCount()`, provided Y's call returns `true`.
-  bool DecrementCount();
-
-  // BlockingCounter::Wait()
-  //
-  // Blocks until the counter reaches zero. This function may be called at most
-  // once. On return, `DecrementCount()` will have been called "initial_count"
-  // times and the blocking counter may be destroyed.
-  //
-  // Memory ordering: For any threads X and Y, any action taken by X
-  // before X calls `DecrementCount()` is visible to Y after Y returns
-  // from `Wait()`.
-  void Wait();
-
- private:
-  Mutex lock_;
-  int count_ ABSL_GUARDED_BY(lock_);
-  int num_waiting_ ABSL_GUARDED_BY(lock_);
-};
-
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_SYNCHRONIZATION_BLOCKING_COUNTER_H_