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101 lines
3.0 KiB
101 lines
3.0 KiB
/*
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* Copyright (c) 2010-2012 OTClient <https://github.com/edubart/otclient>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef COROUTINE_H
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#define COROUTINE_H
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#include "thread.h"
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#include <functional>
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#include <cassert>
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namespace stdext {
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class coroutine
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{
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struct codata : public stdext::shared_object {
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std::unique_ptr<std::thread> thread;
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std::condition_variable conditionVar;
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std::mutex mutex;
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std::function<void()> func;
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};
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stdext::shared_object_ptr<codata> m;
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void run() {
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assert(m->func);
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m->func();
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std::lock_guard<std::mutex> lock(m->mutex);
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m->func = nullptr;
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m->conditionVar.notify_all();
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}
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public:
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coroutine() : m(stdext::make_shared_object<codata>()) { }
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coroutine(const coroutine& other) : m(other.m) { }
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coroutine& operator=(const coroutine& other) { m = other.m; return *this; }
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~coroutine() {
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if(m.is_unique()) {
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m->conditionVar.notify_all();
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m->thread->join();
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assert(!m->func);
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}
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}
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void create(const std::function<void()>& func) {
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assert(!!func && !m->func);
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m->func = func;
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}
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void yield() const {
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std::unique_lock<std::mutex> lock(m->mutex);
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m->conditionVar.notify_all();
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m->conditionVar.wait(lock);
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}
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void resume() {
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if(!m->thread) {
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std::unique_lock<std::mutex> lock(m->mutex);
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m->thread.reset(new std::thread(std::bind(&coroutine::run, this)));
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m->conditionVar.wait(lock); // wait for the thread to start
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} else {
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std::unique_lock<std::mutex> lock(m->mutex);
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assert(m->func);
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m->conditionVar.notify_all();
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m->conditionVar.wait(lock);
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}
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}
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void join() {
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while(!is_finished())
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resume();
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}
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bool is_suspended() { return !!m->func; }
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bool is_finished() { return !m->func; }
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};
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};
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#endif
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