sched_get_priority_max()

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 algorithms” in the chapter on the Neutrino 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.

Returns:

The appropriate minimum 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:

POSIX 1003.1 PS

See also:

sched_getparam(), sched_get_priority_min(), sched_setparam(), sched_getscheduler(), sched_setscheduler()

Processes and Threads chapter of Getting Started with QNX Neutrino