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PTHREAD_MUTEX_GETP... DragonFly Library Functions Manual PTHREAD_MUTEX_GETP...

NAME
     pthread_mutex_getprioceiling, pthread_mutex_setprioceiling -- get or set
     the priority ceiling of a mutex

LIBRARY
     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS
     #include <pthread.h>

     int
     pthread_mutex_getprioceiling(const pthread_mutex_t * restrict mutex,
         int * restrict prioceiling);

     int
     pthread_mutex_setprioceiling(pthread_mutex_t * restrict mutex,
         int prioceiling, int * restrict old_ceiling);

DESCRIPTION
     The pthread_mutex_getprioceiling() function shall return the current
     priority ceiling of the mutex.

     The pthread_mutex_setprioceiling() function shall either lock the mutex
     if it is unlocked, or block until it can successfully lock the mutex,
     then it shall change the mutex's priority ceiling and release the mutex.
     When the change is successful, the previous value of the priority ceiling
     shall be returned in old_ceiling.  The process of locking the mutex need
     not adhere to the priority protect protocol.  If the
     pthread_mutex_setprioceiling() function fails, the mutex priority ceiling
     shall not be changed.

RETURN VALUES
     If successful, these functions return 0.  Otherwise, an error number is
     returned to indicate the error.

ERRORS
     The pthread_mutex_getprioceiling() and pthread_mutex_setprioceiling()
     functions will fail if:

     [EINVAL]           The priority requested by prioceiling is out of range;
                        or the value specified by mutex does not refer to a
                        currently existing mutex.

     [EPERM]            The caller does not have the privilege to perform the
                        operation.

SEE ALSO
     pthread_mutex_destroy(3), pthread_mutex_init(3), pthread_mutex_lock(3),
     pthread_mutex_timedlock(3), pthread_mutex_trylock(3),
     pthread_mutex_unlock(3)

DragonFly 5.5                  November 30, 2017                 DragonFly 5.5