sched_get_priority_max()
QNX SDP8.0C Library ReferenceAPIDeveloper
Get the maximum priority for the scheduling policy
Synopsis:
#include <sched.h>
int sched_get_priority_max( int policy );
Arguments:
- policy
- The scheduling policy, which must be 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 — similar to SCHED_FIFO, except that 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
pthread_attr_setschedpolicy(),
and
Scheduling policies
in the chapter on the microkernel in the System Architecture guide.
Library:
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
Description:
The sched_get_priority_max() function returns the maximum value for the scheduling policy specified by policy.
Note:
If you query the highest allowable priority for a process, it might result in the denial of
a secpolmonitor ability.
Returns:
The appropriate maximum for success, or -1 (errno is set).
Errors:
- EINVAL
- The value of the policy parameter doesn't represent a defined scheduling policy.
- ENOSYS
- The sched_get_priority_max() function isn't currently supported.
Examples:
See sched_getparam().
Classification:
| Safety: | |
|---|---|
| Cancellation point | No |
| Signal handler | Yes |
| Thread | Yes |
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