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pthread_setschedparam()

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 get 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 QNX Neutrino 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.

Returns:

EOK

Success.

EINVAL

Invalid scheduling policy policy or parameters param.

ENOTSUP

Unsupported scheduling policy policy or parameters param.

EPERM

Insufficient privilege to modify scheduling policy policy or parameters param.

ESRCH

Invalid thread ID thread.

Classification:

POSIX 1003.1 THR TPS

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	Yes
Thread	Yes

See also:

pthread_getschedparam(), sched_param

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