PTHREAD_ATTR_GETSCHEDPARAM(POSIX Programmer's ManPTHREAD_ATTR_GETSCHEDPARAM(P)NAME
pthread_attr_getschedparam, pthread_attr_setschedparam - get and set
the schedparam attribute
SYNOPSIS
#include <pthread.h>
int pthread_attr_getschedparam(const pthread_attr_t *restrict attr,
struct sched_param *restrict param);
int pthread_attr_setschedparam(pthread_attr_t *restrict attr,
const struct sched_param *restrict param);
DESCRIPTION
The pthread_attr_getschedparam(), and pthread_attr_setschedparam()
functions, respectively, shall get and set the scheduling parameter
attributes in the attr argument. The contents of the param structure
are defined in the <sched.h> header. For the SCHED_FIFO and SCHED_RR
policies, the only required member of param is sched_priority.
For the SCHED_SPORADIC policy, the required members of the param struc‐
ture are sched_priority, sched_ss_low_priority, sched_ss_repl_period,
sched_ss_init_budget, and sched_ss_max_repl. The specified
sched_ss_repl_period must be greater than or equal to the specified
sched_ss_init_budget for the function to succeed; if it is not, then
the function shall fail. The value of sched_ss_max_repl shall be within
the inclusive range [1, {SS_REPL_MAX}] for the function to succeed; if
not, the function shall fail.
RETURN VALUE
If successful, the pthread_attr_getschedparam() and
pthread_attr_setschedparam() functions shall return zero; otherwise, an
error number shall be returned to indicate the error.
ERRORS
The pthread_attr_setschedparam() function may fail if:
EINVAL The value of param is not valid.
ENOTSUP
An attempt was made to set the attribute to an unsupported
value.
These functions shall not return an error code of [EINTR].
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
After these attributes have been set, a thread can be created with the
specified attributes using pthread_create(). Using these routines does
not affect the current running thread.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSOpthread_attr_destroy() , pthread_attr_getscope() , pthread_attr_get‐
inheritsched() , pthread_attr_getschedpolicy() , pthread_create() , the
Base Definitions volume of IEEE Std 1003.1-2001, <pthread.h>, <sched.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online
at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 PTHREAD_ATTR_GETSCHEDPARAM(P)
