| /* |
| * Copyright 2015-2017 ARM Limited |
| * |
| * 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 |
| * |
| * http://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. |
| */ |
| |
| #ifndef SPIRV_CROSS_THREAD_GROUP_HPP |
| #define SPIRV_CROSS_THREAD_GROUP_HPP |
| |
| #include <condition_variable> |
| #include <mutex> |
| #include <thread> |
| |
| namespace spirv_cross |
| { |
| template <typename T, unsigned Size> |
| class ThreadGroup |
| { |
| public: |
| ThreadGroup(T *impl) |
| { |
| for (unsigned i = 0; i < Size; i++) |
| workers[i].start(&impl[i]); |
| } |
| |
| void run() |
| { |
| for (auto &worker : workers) |
| worker.run(); |
| } |
| |
| void wait() |
| { |
| for (auto &worker : workers) |
| worker.wait(); |
| } |
| |
| private: |
| struct Thread |
| { |
| enum State |
| { |
| Idle, |
| Running, |
| Dying |
| }; |
| State state = Idle; |
| |
| void start(T *impl) |
| { |
| worker = std::thread([impl, this] { |
| for (;;) |
| { |
| { |
| std::unique_lock<std::mutex> l{ lock }; |
| cond.wait(l, [this] { return state != Idle; }); |
| if (state == Dying) |
| break; |
| } |
| |
| impl->main(); |
| |
| std::lock_guard<std::mutex> l{ lock }; |
| state = Idle; |
| cond.notify_one(); |
| } |
| }); |
| } |
| |
| void wait() |
| { |
| std::unique_lock<std::mutex> l{ lock }; |
| cond.wait(l, [this] { return state == Idle; }); |
| } |
| |
| void run() |
| { |
| std::lock_guard<std::mutex> l{ lock }; |
| state = Running; |
| cond.notify_one(); |
| } |
| |
| ~Thread() |
| { |
| if (worker.joinable()) |
| { |
| { |
| std::lock_guard<std::mutex> l{ lock }; |
| state = Dying; |
| cond.notify_one(); |
| } |
| worker.join(); |
| } |
| } |
| std::thread worker; |
| std::condition_variable cond; |
| std::mutex lock; |
| }; |
| Thread workers[Size]; |
| }; |
| } |
| |
| #endif |