pthread_getschedparam(3C)Standard C Library Functionspthread_getschedparam(3C)NAME
pthread_getschedparam, pthread_setschedparam - access dynamic thread
scheduling parameters
SYNOPSIS
cc -mt [ flag... ] file... -lpthread [ library... ]
#include <pthread.h>
int pthread_getschedparam(pthread_t thread, int *restrict policy,
struct sched_param *restrict param);
int pthread_setschedparam(pthread_t thread, int policy, const struct
sched_param *param);
DESCRIPTION
The pthread_getschedparam() and pthread_setschedparam() functions allow
the scheduling policy and scheduling parameters of individual threads
within a multithreaded process to be retrieved and set. Supported poli‐
cies are SCHED_FIFO, SCHED_RR, and SCHED_OTHER. See pthreads(5). For
SCHED_FIFO, SCHED_RR, and SCHED_OTHER, the affected scheduling parame‐
ter is the sched_priority member of the sched_param structure.
The pthread_getschedparam() function retrieves the scheduling policy
and scheduling parameters for the thread whose thread ID is given by
thread and stores those values in policy and param, respectively. The
priority value returned from pthread_getschedparam() is the value spec‐
ified by the most recent pthread_setschedparam() or pthread_create()
call affecting the target thread, and reflects any temporary adjust‐
ments to its priority as a result of any priority inheritance or ceil‐
ing functions. The pthread_setschedparam() function sets the scheduling
policy and associated scheduling parameters for the thread whose thread
ID is given by thread to the policy and associated parameters provided
in policy and param, respectively.
If the pthread_setschedparam() function fails, no scheduling parameters
will be changed for the target thread.
RETURN VALUES
If successful, the pthread_getschedparam() and pthread_setschedparam()
functions return 0. Otherwise, an error number is returned to indicate
the error.
ERRORS
The pthread_getschedparam() function may fail if:
ESRCH The value specified by thread does not refer to a
existing thread.
The pthread_setschedparam() function may fail if:
EINVAL The value specified by policy or one of the scheduling
parameters associated with the scheduling policy policy
is invalid.
EPERM The caller does not have the appropriate permission to
set either the scheduling parameters or the scheduling
policy of the specified thread.
ESRCH The value specified by thread does not refer to a
existing thread.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Standard │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │MT-Safe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOpthread_attr_init(3C), sched_getparam(3RT), sched_setparam(3RT),
sched_getscheduler(3RT), sched_setscheduler(3RT), attributes(5),
pthreads(5), standards(5)SunOS 5.10 23 Nov 2005 pthread_getschedparam(3C)
