114 lines
2.0 KiB
C++
114 lines
2.0 KiB
C++
/*
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* Copyright 2015-2016 ARM Limited
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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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* http://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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*/
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#ifndef SPIRV_CROSS_THREAD_GROUP_HPP
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#define SPIRV_CROSS_THREAD_GROUP_HPP
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#include <condition_variable>
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#include <mutex>
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#include <thread>
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namespace spirv_cross
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{
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template <typename T, unsigned Size>
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class ThreadGroup
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{
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public:
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ThreadGroup(T *impl)
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{
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for (unsigned i = 0; i < Size; i++)
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workers[i].start(&impl[i]);
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}
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void run()
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{
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for (auto &worker : workers)
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worker.run();
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}
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void wait()
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{
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for (auto &worker : workers)
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worker.wait();
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}
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private:
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struct Thread
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{
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enum State
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{
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Idle,
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Running,
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Dying
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};
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State state = Idle;
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void start(T *impl)
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{
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worker = std::thread([impl, this] {
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for (;;)
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{
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{
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std::unique_lock<std::mutex> l{ lock };
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cond.wait(l, [this] { return state != Idle; });
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if (state == Dying)
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break;
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}
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impl->main();
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std::lock_guard<std::mutex> l{ lock };
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state = Idle;
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cond.notify_one();
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}
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});
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}
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void wait()
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{
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std::unique_lock<std::mutex> l{ lock };
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cond.wait(l, [this] { return state == Idle; });
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}
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void run()
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{
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std::lock_guard<std::mutex> l{ lock };
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state = Running;
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cond.notify_one();
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}
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~Thread()
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{
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if (worker.joinable())
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{
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{
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std::lock_guard<std::mutex> l{ lock };
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state = Dying;
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cond.notify_one();
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}
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worker.join();
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}
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}
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std::thread worker;
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std::condition_variable cond;
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std::mutex lock;
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};
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Thread workers[Size];
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};
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}
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#endif
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