sched_get_priority_max(3POSIX)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES

NAME

sched_get_priority_max, sched_get_priority_min, sched_rr_get_interval- get priority and time quantum information for scheduling policy

SYNOPSIS

#include <sched.h>
#include <time.h>

int sched_get_priority_max(int policy);
int sched_get_priority_min(int policy);
int sched_rr_get_interval(int id, struct timespec * interval);

DESCRIPTION

The sched_get_priority_max and sched_get_priority_min functions respectively return the maximum and minimum priority values in the range defined for the scheduling policy specified by policy . One of the policies defined in <sched.h> must be specified.

The sched_rr_get_interval function stores, in the location referenced by interval , the time quantum currently in effect under the SCHED_RR policy. The time quantum is defined as the execution time limit after which a rescheduling decision may be made if another thread at the same priority is ready to execute. The id field must be set to zero.

RETURN VALUE

Upon successful completion, sched_get_priority_max and sched_get_priority_min return the appropriate maximum or minimum values, respectively. Otherwise, they return a value of -1 and set errno to indicate the error condition.

Upon successful completion, sched_rr_get_interval returns zero. Otherwise, it returns a value of -1 and sets errno to indicate the error condition.

ERRORS

[EINVAL]

The policy argument does not identify a defined scheduling policy ( sched_get_priority_max and sched_get_priority_min only).

[ESRCH]

The id argument is not zero ( sched_rr_get_interval only).

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Interface Stability	Evolving

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES