#include <sched.h> int sched_yield(void);
The sched_yield() function forces the running thread to relinquish the processor until the process again becomes the head of its process list. It takes no arguments.
If successful, sched_yield() returns 0, otherwise, it returns −1, and sets errno to indicate the error condition.
No errors are defined.
See attributes(5) for descriptions of the following attributes: