C++11 非对称协程库(只需要单独一个.h文件)
支持几个必备的协程原语(命名空间coroutine):
创建协程:routine_t create( std::function f );
销毁协程:void destroy( routine_t id );
恢复协程执行:int resume( routine_t id );
放弃协程执行:void yield();
等待异步任务结果:TYPE await(TYPE(*f)());
获取当前协程的ID:routine_t current();
SPSC通信模板类:class Channel:支持push()/pop()操作;
//只需下载include此文件
//SPSC通道,多个生产者或消费者,协程调度行为不好控制 coroutine::Channel channel;
string async_func() { std::this_thread::sleep_for(std::chrono::milliseconds(3000)); return “21”; }
void routine_func1() { //从通道中获取消息,如果没有消息会yield int i = channel.pop(); std::cout << i << std::endl;
i = channel.pop(); std::cout << i << std::endl; }
void routine_func2(int i) { std::cout << “20” << std::endl;
//放弃当前协程的执行,返回恢复点 coroutine::yield();
std::cout << “21” << std::endl; //异步执行任务,如果任务无法立即执行完毕,会yield string str = coroutine::await(async_func); std::cout << str << std::endl; }
void thread_func() { //创建协称,回调函数形式为:std::function coroutine::routine_t rt1 = coroutine::create(routine_func1); coroutine::routine_t rt2 = coroutine::create(std::bind(routine_func2, 2)); std::cout << “00” << std::endl;
//恢复rt1 coroutine::resume(rt1);
std::cout << “01” << std::endl;
//恢复rt2 coroutine::resume(rt2);
std::cout << “02” << std::endl; //向通道推送消息 channel.push(10);
std::cout << “03” << std::endl; coroutine::resume(rt2);
std::cout << “04” << std::endl; channel.push(11);
std::cout << “05” << std::endl;
//销毁协程。 //建议:协程在执行完毕后统一释放,这样协程栈空间中的对象能够安全的被到释放。 coroutine::destroy(rt1); coroutine::destroy(rt2); }
int main() { std::thread t1(thread_func); std::thread t2({ //不支持跨线程的协程调度 }); t1.join(); t2.join(); return 0; }