Return Values

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

If the following condition occurs, pthread_mutexattr_getprotocol() fails and returns the corresponding value.

ENOSYS

Neither of the options, _POSIX_THREAD_PRIO_INHERIT nor _POSIX_THREAD_PRIO_PROTECT is defined and the implementation does not support the function.

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

EINVAL

The value specified by attr is invalid.

EPERM

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