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std::this_thread::yield

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< cpp‎ | thread
Revision as of 18:33, 9 July 2013 by P12bot (Talk | contribs)

Defined in header <thread>
void yield();
(since C++11)

Provides a hint to the implementation to reschedule the execution of threads, allowing other threads to run.

Parameters

(none)

Return value

(none)

Example

#include <iostream>
#include <chrono>
#include <thread>
 
// "busy sleep" while suggesting that other threads run 
// for a small amount of time
void little_sleep(std::chrono::microseconds us)
{
    auto start = std::chrono::high_resolution_clock::now();
    auto end = start + us;
    do {
        std::this_thread::yield();
    } while (std::chrono::high_resolution_clock::now() < end);
}
 
int main()
{
    auto start = std::chrono::high_resolution_clock::now();
 
    little_sleep(std::chrono::microseconds(100));
 
    auto elapsed = std::chrono::high_resolution_clock::now() - start;
    std::cout << "waited for "
              << std::chrono::duration_cast<std::chrono::microseconds>(elapsed).count()
              << " microseconds\n";
}

Possible output:

waited for 128 microseconds