1PTHREAD_ATTR_GETSCHEDPARAM(PP)OSIX Programmer's ManuPaTlHREAD_ATTR_GETSCHEDPARAM(P)
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NAME

6       pthread_attr_getschedparam,  pthread_attr_setschedparam  -  get and set
7       the schedparam attribute
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SYNOPSIS

10       #include <pthread.h>
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12       int pthread_attr_getschedparam(const pthread_attr_t *restrict attr,
13              struct sched_param *restrict param);
14       int pthread_attr_setschedparam(pthread_attr_t *restrict attr,
15              const struct sched_param *restrict param);
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DESCRIPTION

19       The  pthread_attr_getschedparam(),   and   pthread_attr_setschedparam()
20       functions,  respectively,  shall  get  and set the scheduling parameter
21       attributes in the attr argument. The contents of  the  param  structure
22       are  defined  in the <sched.h> header.  For the SCHED_FIFO and SCHED_RR
23       policies, the only required member of param is sched_priority.
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25       For the SCHED_SPORADIC policy, the required members of the param struc‐
26       ture  are  sched_priority, sched_ss_low_priority, sched_ss_repl_period,
27       sched_ss_init_budget,    and    sched_ss_max_repl.    The     specified
28       sched_ss_repl_period  must  be  greater  than or equal to the specified
29       sched_ss_init_budget for the function to succeed; if it  is  not,  then
30       the function shall fail. The value of sched_ss_max_repl shall be within
31       the inclusive range [1, {SS_REPL_MAX}] for the function to succeed;  if
32       not, the function shall fail.
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RETURN VALUE

35       If      successful,      the      pthread_attr_getschedparam()      and
36       pthread_attr_setschedparam() functions shall return zero; otherwise, an
37       error number shall be returned to indicate the error.
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ERRORS

40       The pthread_attr_setschedparam() function may fail if:
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42       EINVAL The value of param is not valid.
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44       ENOTSUP
45              An  attempt  was  made  to  set  the attribute to an unsupported
46              value.
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49       These functions shall not return an error code of [EINTR].
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51       The following sections are informative.
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EXAMPLES

54       None.
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APPLICATION USAGE

57       After these attributes have been set, a thread can be created with  the
58       specified  attributes using pthread_create(). Using these routines does
59       not affect the current running thread.
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RATIONALE

62       None.
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FUTURE DIRECTIONS

65       None.
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SEE ALSO

68       pthread_attr_destroy() ,  pthread_attr_getscope()  ,  pthread_attr_get‐
69       inheritsched() , pthread_attr_getschedpolicy() , pthread_create() , the
70       Base Definitions volume of IEEE Std 1003.1-2001, <pthread.h>, <sched.h>
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73       Portions of this text are reprinted and reproduced in  electronic  form
74       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
75       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
76       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
77       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
78       event of any discrepancy between this version and the original IEEE and
79       The Open Group Standard, the original IEEE and The Open Group  Standard
80       is  the  referee document. The original Standard can be obtained online
81       at http://www.opengroup.org/unix/online.html .
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85IEEE/The Open Group                  2003        PTHREAD_ATTR_GETSCHEDPARAM(P)
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