C++11this_threadyeild(12)

2016-02-24

字数统计: 379字 | 阅读时长≈ 1分

原文地址：http://www.cplusplus.com/reference/thread/this\_thread/yield/

function

std::this_thread::yield

void yield() noexcept;

Yield to other threads

The calling thread yields, offering the implementation the opportunity to reschedule.
挂起当前线程的运行，给其他线程运行的机会。

This function shall be called when a thread waits for other threads to advance without blocking.

该方法应该在一个线程等待其他线程资源的时候不阻塞地调用。（即等待其他资源的时候，应该挂起该线程）

Parameters

none

Return value

none

Example

// this_thread::yield example
#include <iostream>       // std::cout
#include <thread>         // std::thread, std::this_thread::yield
#include <atomic>         // std::atomic

std::atomic<bool> ready (false);

void count1m(int id) {
  while (!ready) {             // wait until main() sets ready...
    std::this_thread::yield();
  }
  for (volatile int i=0; i<1000000; ++i) {}
  std::cout << id;
}

int main ()
{
  std::thread threads[10];
  std::cout << "race of 10 threads that count to 1 million:\n";
  for (int i=0; i<10; ++i) threads[i]=std::thread(count1m,i);
  ready = true;               // go!
  for (auto& th : threads) th.join();
  std::cout << '\n';

  return 0;
}