Set the priority ceiling of a mutex attribute object
Synopsis:
#include <pthread.h>
int pthread_mutexattr_setprioceiling(
pthread_mutexattr_t* attr,
int prioceiling );
Arguments:
- attr
- A pointer to the pthread_mutexattr_t object that you
want to set the attribute in.
- prioceiling
- The new value for the priority ceiling.
Library:
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
Description:
The pthread_mutexattr_setprioceiling() function sets the mutex
attribute attr's scheduling priority ceiling to
prioceiling. Note that attr must have been previously
created with pthread_mutexattr_init().
Note:
-
In order to change the priority ceiling to a value above the maximum permitted for unprivileged processes,
your process must have the PROCMGR_AID_PRIORITY ability enabled.
For more information, see
procmgr_ability().
- Robust mutexes, mutexes with priority ceilings, and those using
SyncMutexEvent()
use more system resources than other mutexes.
Returns:
- EOK
- Success.
- EINVAL
- Invalid value specified by attr or prioceiling.
- EPERM
- The calling process doesn't have the required permission; see
procmgr_ability().
Classification:
POSIX 1003.1 RPP TPP
| Safety: |
|
|---|
| Cancellation point |
No |
| Interrupt handler |
No |
| Signal handler |
Yes |
| Thread |
Yes |