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PTHREAD_YIELD(3) Library Functions Manual PTHREAD_YIELD(3)

pthread_yield
yield control of the current thread

#include <pthread.h>
void
pthread_yield(void);

The pthread_yield() function resets the accumulated time slice of the current thread and then enters the thread scheduler, which resumes execution of the next thread ready to run. If no other thread is ready to run, control returns to the current thread.

pthreads(3)

pthread_yield() is a non-portable (but quite common) extension to IEEE Std 1003.1-2001 (“POSIX.1”).
June 5, 2013 OpenBSD-current