pthread_setschedprio Return Values

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

EINVAL

Description:

The value of prio is invalid for the scheduling policy of the specified thread.

ENOTSUP

Description:

An attempt was made to set the priority to an unsupported value.

EPERM

Description:

The caller does not have the appropriate permission to set the scheduling priority of the specified thread.

ESRCH

Description:

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