void thrd_yield(void);
(since C11)Provides a hint to the implementation to reschedule the execution of threads, allowing other threads to run.
[edit] Parameters(none)
[edit] Return value(none)
[edit] NotesThe 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.
The POSIX equivalent of this function is sched_yield.
#include <stdio.h>
#include <time.h>
#include <threads.h>
// utility function: difference between timespecs in microseconds
double usdiff(struct timespec s, struct timespec e)
{
double sdiff = difftime(e.tv_sec, s.tv_sec);
long nsdiff = e.tv_nsec - s.tv_nsec;
if(nsdiff < 0) return 1000000*(sdiff-1) + (1000000000L+nsdiff)/1000.0;
else return 1000000*(sdiff) + nsdiff/1000.0;
}
// busy wait while yielding
void sleep_100us()
{
struct timespec start, end;
timespec_get(&start, TIME_UTC);
do {
thrd_yield();
timespec_get(&end, TIME_UTC);
} while(usdiff(start, end) < 100.0);
}
int main()
{
struct timespec start, end;
timespec_get(&start, TIME_UTC);
sleep_100us();
timespec_get(&end, TIME_UTC);
printf("Waited for %.3f us\n", usdiff(start, end));
}
Possible output:
[edit] ReferencesRetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4