개요

• 솔라나라에 설명된 어플리케이션에 대해 맨 페이지를 찾아 출력한다.
• MAN 페이지에 대한 설명은 윈디하나의 솔라나라: MAN 페이지을 참고하자.
• svcadm(1M)을 검색하려면 섹션에서 1M 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.

pthread_mutex_getprioceiling(3c)

Standard C Library Functions
                                              pthread_mutex_getprioceiling(3C)



NAME
       pthread_mutex_getprioceiling,   pthread_mutex_setprioceiling  -  change
       priority ceiling of a mutex

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 returns the current  prior‐
       ity 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 ceil‐
       ing  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  prior‐
       ity 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 ceil‐
       ing 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  unde‐
       fined. 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(3C)) when called on the version  of  Solaris  on
       which the ceiling value is being utilized.

RETURN VALUES
       Upon  successful  completion,  the  pthread_mutex_getprioceiling()  and
       pthread_mutex_setprioceiling() functions return 0. Otherwise, an  error
       number is returned to indicate the error.

ERRORS
       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.



       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.


       EINVAL    The priority requested by prioceiling is out of range.


       EPERM     The caller does not have the privilege to perform the  opera‐
                 tion.


ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:


       tab()  box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
       TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelMT-Safe _  Stan‐
       dardSee standards(7).


SEE ALSO
       pthread_mutex_init(3C),     pthread_mutex_lock(3C),    sched_get_prior‐
       ity_min(3C), attributes(7), standards(7)



Oracle Solaris 11.4               16 May 2014
                                              pthread_mutex_getprioceiling(3C)