pthread_setschedparam()
QNX SDP8.0C Library ReferenceAPIDeveloper
Set thread scheduling parameters
Synopsis:
#include <pthread.h>
int pthread_setschedparam(
pthread_t thread,
int policy,
const struct sched_param *param );
Arguments:
- thread
- The ID of the thread that you want to set the scheduling parameters for. You can get a thread ID by calling pthread_create() or pthread_self().
- policy
- The new scheduling policy; one of:
- SCHED_FIFO — a fixed-priority scheduler in which the highest priority, ready thread runs until it blocks or is preempted by a higher priority thread.
- SCHED_RR — the same as SCHED_FIFO, except threads at the same priority level timeslice (round robin) every 4 × the clock period (see ClockPeriod()).
- SCHED_OTHER — currently the same as SCHED_RR.
- SCHED_SPORADIC — sporadic scheduling.
For more information, see
Thread scheduling
in the IDE Microkernel chapter of the System Architecture guide. - param
- A pointer to a sched_param structure that specifies the scheduling parameters that you want to use.
Library:
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
Description:
The pthread_setschedparam() function sets the scheduling policy and associated scheduling parameters of thread thread to the values specified in policy and param.
Note:
In order to change the thread's priority 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().
Returns:
- EOK
- Success.
- EINVAL
- Invalid scheduling policy policy or parameters param.
- ENOTSUP
- Unsupported scheduling policy policy or parameters param.
- EPERM
- The calling process doesn't have the required permission; see procmgr_ability().
- ESRCH
- Invalid thread ID thread.
Classification:
| Safety: | |
|---|---|
| Cancellation point | No |
| Signal handler | Yes |
| Thread | Yes |
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