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 pri-
ority specified by priority. By default, threads contend for synchronization 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 synchro-
nization 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 synchronization 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 ALSO
priocntl(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)