thr_getprio(3C) Standard C Library Functions thr_getprio(3C)NAME
thr_getprio, thr_setprio - access dynamic thread scheduling
SYNOPSIS
cc -mt [ flag... ] file...[ library... ]
#include <thread.h>
int thr_setprio(thread_t target_thread, int priority);
int thr_getprio(thread_t target_thread, int *priority);
DESCRIPTION
The thr_setprio() function dynamically changes the priority of the
thread specified by target_thread within the current process to the
priority specified by priority. By default, threads contend for syn‐
chronization objects based on fixed priorities that range from 0, the
least significant, to 127. The target_thread will receive precedence
by libthread over lower priority threads with respect to synchroniza‐
tion object contention.
The thr_getprio() function stores the current priority for the thread
specified by target_thread in the location pointed to by priority.
Thread priorities regulate the order in which threads unblock from syn‐
chronization objects and are different from realtime priorities, which
regulate and enforce access to CPU resources. Programs that need
access to "real" priorities should use bound threads in the realtime
class (see priocntl(2)).
RETURN VALUES
If successful, the thr_getprio() and thr_setprio() return 0. Otherwise,
an error number is returned to indicate the error.
ERRORS
For each of the following conditions, these functions return an error
number if the condition is detected.
ESRCH The value specified by target_thread does not refer to
an existing thread.
The thr_getprio() and thr_setprio() functions may fail if:
EINVAL The value of priority makes no sense for the scheduling
class associated with the target_thread.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │MT-Safe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOpriocntl(2), sched_setparam(3RT), thr_create(3C), thr_suspend(3C),
thr_yield(3C), attributes(5), standards(5)SunOS 5.10 22 Mar 2001 thr_getprio(3C)
