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74 lines
2.2 KiB
C++
74 lines
2.2 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_WINDOWS_THREAD_POOL_H_
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#define PLATFORM_IMPL_WINDOWS_THREAD_POOL_H_
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#include <windows.h>
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#include <queue>
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#include <utility>
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#include "absl/synchronization/mutex.h"
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#include "internal/platform/runnable.h"
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namespace nearby {
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namespace windows {
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class ThreadPool {
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public:
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virtual ~ThreadPool();
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static std::unique_ptr<ThreadPool> Create(int max_pool_size);
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// Runs a task on thread pool. The result indicates whether the task is put
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// into the thread pool.
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bool Run(Runnable task);
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// The thread pool is closed immediately if there are no outstanding work,
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// I/O, timer, or wait objects that are bound to the pool; otherwise, the
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// thread pool is released asynchronously after the outstanding objects are
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// freed.
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void ShutDown();
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private:
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ThreadPool(PTP_POOL thread_pool, TP_CALLBACK_ENVIRON thread_pool_environ,
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int max_pool_size);
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void RunNextTask();
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// Protects the access to tasks of the thread pool.
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mutable absl::Mutex mutex_;
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// The task queue of the thread pool. Thread pool will pick up task to run
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// when it is idle.
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std::queue<Runnable> tasks_ ABSL_GUARDED_BY(mutex_);
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// Keeps the pointer of the thread pool. It is created when constructing the
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// thread pool.
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PTP_POOL thread_pool_ = nullptr;
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// Keeps the environment of the thread pool.
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TP_CALLBACK_ENVIRON thread_pool_environ_;
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// The maximum thread count in the thread pool
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int max_pool_size_ = 0;
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friend VOID CALLBACK WorkCallback(PTP_CALLBACK_INSTANCE instance,
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PVOID parameter, PTP_WORK work);
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};
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} // namespace windows
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} // namespace nearby
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#endif // PLATFORM_IMPL_WINDOWS_THREAD_POOL_H_
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