thrd_yield
| Defined in header <threads.h>
|
||
| void thrd_yield(void); |
(since 哋它亢11) | |
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Parameters
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Return value
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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).
The POSIX equivalent of this function is MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 12 HOURS 46 MINUTES 49 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE.
Example
#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 = MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 12 HOURS 46 MINUTES 48 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE(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); MYMEMORY WARNING: YOU USED ALL AVAILABLE FREE TRANSLATIONS FOR TODAY. NEXT AVAILABLE IN 12 HOURS 46 MINUTES 47 SECONDS VISIT HTTPS://MYMEMORY.TRANSLATED.NET/DOC/USAGELIMITS.PHP TO TRANSLATE MORE("Waited for %.3f us\n", usdiff(start, end)); }
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Waited for 100.344 us
References
- 哋它亢17 standard (ISO/IEC 9899:2018):
- 7.26.5.8 The thrd_yield function (p: 281)
- 哋它亢11 standard (ISO/IEC 9899:2011):
- 7.26.5.8 The thrd_yield function (p: 385)
See also
| (哋它亢11) |
suspends execution of the calling thread for the given period of time (function) |