Set thread scheduling parameters
#include <pthread.h> int pthread_setschedparam( pthread_t thread, int policy, const struct sched_param *param );
- 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() .
- 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.
- A pointer to a sched_param structure that specifies the scheduling parameters that you want to use.
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The pthread_setschedparam() function sets the scheduling policy and associated scheduling parameters of thread thread to the values specified in policy and param.
In order to set the scheduling policy policy for a process whose real or saved user ID is different from the calling process's real or effective user ID, your process must have the PROCMGR_AID_SCHEDULE ability enabled. In order to change its 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() .
- Invalid scheduling policy policy or parameters param.
- Unsupported scheduling policy policy or parameters param.
- The calling process doesn't have the required permission; see procmgr_ability() .
- Invalid thread ID thread.
Last modified: 2013-12-23