Return Values

On successful completion, pthread_mutexattr_setprotocol() returns 0. Any other return value indicates that an error occurred.

If either of the following conditions occurs, pthread_mutexattr_setprotocol() fails and returns the corresponding value.

ENOSYS

Neither of the options _POSIX_THREAD_PRIO_INHERIT and _POSIX_THREAD_PRIO_PROTECT is defined and the implementation does not support the function.

ENOTSUP

The value specified by protocol is an unsupported value.

If either of the following conditions occurs, pthread_mutexattr_setprotocol() might fail and return the corresponding value.

EINVAL

The value specified by attr or protocol is not valid.

EPERM

The caller does not have the privilege to perform the operation.