std::this_thread::yield
From cppreference.com
C++
Feature test macros (C++20)
Concepts library (C++20)
Metaprogramming library (C++11)
Ranges library (C++20)
Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
Concurrency support library
(C++11)
(C++20)
(C++11)
yield
(C++11)
(C++11)
(C++11)
(C++20)
(C++26)
(C++26)
(C++20)
(C++26)
(C++20)
(C++26)
(C++26)
(C++26)
(C++26)
(C++26)
(C++26)
(C++11)
(C++11)
(C++17)
(C++11)
(C++14)
(C++11)
(C++11)
(C++11)
(C++11)(C++11)(C++11)(C++11)(C++11)(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++20)(C++20)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++26)
(C++26)
(C++26)
(C++11)
(C++20)
(C++11)
(C++11)(deprecated in C++20)
(C++11)(deprecated in C++20)
(C++11)
(C++11)
(C++11)(deprecated in C++26)
(C++11)
(C++11)
(C++11)(C++11)
(C++11)(C++11)
(C++11)(C++11)
(C++11)(C++11)
(C++11)(C++11)
(C++11)(C++11)
(C++11)(C++11)
(C++11)(C++11)
(C++26)(C++26)
(C++26)(C++26)
(C++11)
(C++20)(C++20)
(C++20)
(C++20)
(C++11)(C++11)
(C++11)(C++11)
(C++20)(C++20)
(C++20)(C++20)
(C++20)
(C++20)
Defined in header
<thread>
void yield() noexcept;
(since C++11)
Provides a hint to the implementation to reschedule the execution of threads, allowing other threads to run.
Contents
[edit] Parameters
(none)
[edit] Return value
(none)
[edit] Notes
The exact behavior of this function depends on the implementation, in particular on the mechanics of the OS scheduler in use and the state of the system. For example, a first-in-first-out realtime scheduler (SCHED_FIFO in Linux) would suspend the current thread and put it on the back of the queue of the same-priority threads that are ready to run, and if there are no other threads at the same priority, yield has no effect.
[edit] Example
Run this code
#include <chrono> #include <iostream> #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
[edit] See also
C documentation for thrd_yield