pthread_setschedparam Return Values

pthread_setschedparam() returns zero after completing successfully. Any other return value indicates that an error occurred. When either of the following conditions occurs, the pthread_setschedparam() function fails and returns the corresponding value.

EINVAL

Description:

The value of the attribute being set is not valid.

EPERM

Description:

The caller does not have the appropriate permission to set either the scheduling parameters or the scheduling policy of the specified thread.

ESRCH

Description:

The value specified by tid does not refer to an existing thread.