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https://github.com/kidfromjupiter/nearby.git
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69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
// Copyright 2021 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_WINDOWS_CONDITION_VARIABLE_H_
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#define PLATFORM_IMPL_WINDOWS_CONDITION_VARIABLE_H_
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#include <windows.h>
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#include <stdio.h>
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#include <synchapi.h>
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#include <mutex> // NOLINT
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#include "platform/api/condition_variable.h"
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#include "platform/impl/windows/mutex.h"
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namespace location {
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namespace nearby {
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namespace windows {
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// The ConditionVariable class is a synchronization primitive that can be used
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// to block a thread, or multiple threads at the same time, until another thread
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// both modifies a shared variable (the condition), and notifies the
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// ConditionVariable.
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class ConditionVariable : public api::ConditionVariable {
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public:
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ConditionVariable(api::Mutex* mutex);
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~ConditionVariable() override = default;
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// Notifies all the waiters that condition state has changed.
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void Notify() override;
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// Waits indefinitely for Notify to be called.
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// May return prematurely in case of interrupt, if supported by platform.
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// Returns kSuccess, or kInterrupted on interrupt.
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Exception Wait() override;
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// Waits while timeout has not expired for Notify to be called.
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// May return prematurely in case of interrupt, if supported by platform.
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// Returns kSuccess, or kInterrupted on interrupt.
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Exception Wait(absl::Duration timeout) override;
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private:
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location::nearby::windows::Mutex& mutex_;
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std::condition_variable condition_variable_actual_;
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std::condition_variable& condition_variable_ = condition_variable_actual_;
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std::unique_lock<std::mutex> lock;
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CRITICAL_SECTION critical_section_;
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};
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} // namespace windows
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} // namespace nearby
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} // namespace location
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#endif // PLATFORM_IMPL_WINDOWS_CONDITION_VARIABLE_H_
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