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SunOS 5.10 - man page for pthread_mutex_getprioceiling (sunos section 3c)

pthread_mutex_getprioceiling(3C)										  pthread_mutex_getprioceiling(3C)

NAME
pthread_mutex_getprioceiling, pthread_mutex_setprioceiling - change priority ceiling of a mutex
SYNOPSIS
cc -mt [ flag... ] file... -lpthread [ library... ] #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); The pthread_mutex_getprioceiling() function returns the current priority ceiling of the mutex. The pthread_mutex_setprioceiling() function either locks the mutex if it is unlocked, or blocks until it can successfully lock the mutex, then it changes the mutex's priority ceiling and releases the mutex. When the change is successful, the previous value of the priority ceiling is 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 is not changed. The ceiling value should be drawn from the range of priorities for the SCHED_FIFO policy. When a thread acquires such a mutex, the policy of the thread at mutex acquisition should match that from which the ceiling value was derived (SCHED_FIFO, in this case). If a thread changes its scheduling policy while holding a ceiling mutex, the behavior of pthread_mutex_lock() and pthread_mutex_unlock() on this mutex is undefined. See pthread_mutex_lock(3C). The ceiling value should not be treated as a persistent value resident in a pthread_mutex_t that is valid across upgrades of Solaris. The semantics of the actual ceiling value are determined by the existing priority range for the SCHED_FIFO policy, as returned by the sched_get_priority_min() and sched_get_priority_max() functions (see sched_get_priority_min(3RT)) when called on the version of Solaris on which the ceiling value is being utilized. Upon successful completion, the pthread_mutex_getprioceiling() and pthread_mutex_setprioceiling() functions return 0. Otherwise, an error number is returned to indicate the error. The pthread_mutex_getprioceiling() and pthread_mutex_setprioceiling() functions will fail if: ENOSYS The option _POSIX_THREAD_PRIO_PROTECT is not defined and the system does not support the function. Since _POSIX_THREAD_PRIO_PROTECT is defined, this condition is not reported. The pthread_mutex_setprioceiling() function will fail if: EINVAL The mutex was not initialized with its protocol attribute having the value of PTHREAD_PRIO_PROTECT. The pthread_mutex_getprioceiling() and pthread_mutex_setprioceiling() functions may fail if: EINVAL The value specified by mutex does not refer to a currently existing mutex. ENOSYS The system does not support the priority ceiling protocol for mutexes. EPERM The caller does not have the privilege to perform the operation. The pthread_mutex_getprioceiling() function may fail if: EINVAL The priority requested by prioceiling is out of range. The pthread_mutex_setprioceiling() function may fail if: EINVAL The priority requested by prioceiling is out of range. See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ pthread_mutex_init(3C), pthread_mutex_lock(3C), sched_get_priority_min(3RT), attributes(5), standards(5) 23 Mar 2005 pthread_mutex_getprioceiling(3C)

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