[EINVAL] mutex invalid, or prioceiling out of range.
[EPERM] no privilege to set prioceiling. Hint:
also creates and controls all threads that might lock the mutex.
pthread_mutexattr_getprioceiling............................................. [_POSIX_THREAD_PRIO_PROTECT ]
int pthread_mutexattr_getprioceiling (
const pthread_mutexattr_t *attr,
int *prioceiling);
Determine the priority ceiling at which threads will run while owning a mutex created with attr.
References: 3.2, 5.2.1, 5.5.5 Headers: <pthread.h>
Errors: [ENOSYS] priority scheduling is not supported.
[EINVAL] attr invalid. Hint:
also creates and controls all threads that might lock the mutex.
pthread_mutexattr_getprotocol... [_POSIX_THREAD_PRIO_INHERIT_POSIX_THREAD_PRIO_PROTECT]
int pthread_mutexattr_getprotocol (
const pthread_mutexattr_t *attr,
int *protocol);
Determine whether mutexes created with attr have priority ceiling protocol
protocol
PTHREAD_PRIO_NONE No priority inheritance
protocol.
PTHREAD_PRIO_INHERIT While owning mutex, thread
inherits highest priority of any thread waiting for the mutex.
PTHREAD_PRIO_PROTECT While owning mutex, thread
inherits mutex priority ceiling.
References: 3.2,5.2.1,5.5.5 Headers: <pthread.h>
Errors: [ENOSYS] priority scheduling is not supported.
[EINVAL] attr invalid. Hint:
unless the creator of the mutex also creates and controls all threads
that might lock the mutex.
pthread_mutexattr_setprioceiling............................................... [_POSIX_THREAD_PRIO_PROTECT ]
int pthread_mutexattr_setprioceiling ( pthread_mutexattr_t *attr,
int prioceiling);
Specify the priority ceiling at which threads will run while owning a mutex created with attr. The value of prioceiling must be a valid priority parameter for the
SCHED_FIFO policy.
References: 3.2,5.2.1,5.5.5 Headers: <pthread.h>
Errors: [ENOSYS] priority scheduling is not supported.
[EINVAL] attr or prioceiling invalid.
[EPERM] no permission to set prioceiling. Hint:
also creates and controls all threads that might lock the mutex.
pthread_mutexattr_setprotocol .... [_POSIX_THREAD_PRIO_INHERIT_POSIX_THREAD_PRIO_PROTECT]
int pthread_mutexattr_setprotocol (
pthread_mutexattr_t *attr,
int protocol);
Specify whether mutexes created with attr have priority ceiling protocol
protocol
PTHREAD_PRIO_NONE No priority inheritance
protocol.
PTHREAD_PRIO_INHERIT While owning mutex, thread
inherits highest priority of any thread waiting for the mutex.
PTHREAD_PRIO_PROTECT While owning mutex, thread
inherits mutex priority ceiling.
References: 3.2,5.2.1,5.5.5 Headers: <pthread.h>
Errors: [ENOSYS] priority scheduling is not supported.
[EINVAL] attr or protocol invalid.
[ENOTSUP] protocol value is not supported. Hint:
unless the creator of the mutex also creates and controls all threads
that might lock the mutex.
pthread_setschedparam..............................................[_POSIX_THREAD_PRIORITY_SCHEDULING]
int pthread_setschedparam (
pthread_t thread,
int policy
const struct sched_param *param);
Specify the scheduling policy and parameters (param) to be used by thread.
policy
SCHED_FIFO
SCHED_RR
Run thread until it blocks; preempt lower-priority threads when ready.
Like SCHED_FIFO, but subject to periodic timeslicing.
SCHED_OTHER
Implementation defined (may be SCHED_FIFO, SCHED_RR, or something else).
References:
Headers:
Errors:
Hint:
5.5
<pthread.h>
[ENOSYS] priority scheduling is not supported.
[ESRCH] thread does not refer to an existing thread.
[EINVAL] policy or param is invalid.
[ENOTSUP] policy or param is unsupported value.
[EPERM] no permission to set policy or param.
Try to avoid dynamically modifying thread scheduling policy and
parameters, if possible.
sched_get_priority_max.............................................................. [_POSIX_PRIORITY_SCHEDULING]
