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https://github.com/kidfromjupiter/nearby.git
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48 lines
1.5 KiB
C++
48 lines
1.5 KiB
C++
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef PLATFORM_IMPL_APPLE_COUNT_DOWN_LATCH_H_
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#define PLATFORM_IMPL_APPLE_COUNT_DOWN_LATCH_H_
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#include "absl/synchronization/mutex.h"
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#include "internal/platform/implementation/count_down_latch.h"
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namespace nearby {
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namespace apple {
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// Concrete CountDownLatch implementation.
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class CountDownLatch : public api::CountDownLatch {
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public:
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explicit CountDownLatch(int count) : count_(count) {}
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~CountDownLatch() override = default;
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CountDownLatch(const CountDownLatch&) = delete;
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CountDownLatch& operator=(const CountDownLatch&) = delete;
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Exception Await() override;
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ExceptionOr<bool> Await(absl::Duration timeout) override;
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void CountDown() override;
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private:
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static bool IsZeroOrNegative(int* count) { return 0 >= *count; }
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absl::Mutex mutex_;
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int count_ ABSL_GUARDED_BY(mutex_);
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};
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} // namespace apple
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} // namespace nearby
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#endif // PLATFORM_IMPL_APPLE_COUNT_DOWN_LATCH_H_
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