| Standards / Extensions | C or C++ | Dependencies |
|---|---|---|
| Single UNIX Specification, version 3 | both | z/OS V1R7 |
#define _UNIX03_SOURCE
#include <sched.h>
int sched_yield(void);The sched_yield() function allows a thread to give up control of a processor so that another thread can have the opportunity to run. It takes no arguments.
The speed at which the sched_yield() function releases a processor can be configured by using the _EDC_PTHREAD_YIELD and _EDC_PTHREAD_YIELD_MAX environment variables. The _EDC_PTHREAD_YIELD environment variable is used to configure the sched_yield() function to release the processor immediately, or to release the processor after a delay. The _EDC_PTHREAD_YIELD_MAX environment variable is used to change the maximum delay to a value less than the default (32 milliseconds).
For more information about the _EDC_PTHREAD_YIELD and _EDC_PTHREAD_YIELD_MAX environment variables, see “Using Environment Variables” in z/OS XL C/C++ Programming Guide.
sched_yield() always returns 0.
There are no documented errno values. Use perror() or strerror() to determine the cause of the error.