pthread_attr_getschedparam(3p) — Linux manual page



PROLOG         top

       This manual page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the
       corresponding Linux manual page for details of Linux behavior), or
       the interface may not be implemented on Linux.

NAME         top

       pthread_attr_getschedparam, pthread_attr_setschedparam — get and set
       the schedparam attribute

SYNOPSIS         top

       #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         top

       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
       structure 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.  It is
       unspecified whether the sched_ss_repl_period and sched_ss_init_budget
       values are stored as provided by this function or are rounded to
       align with the resolution of the clock being used.

       The behavior is undefined if the value specified by the attr argument
       to pthread_attr_getschedparam() or pthread_attr_setschedparam() does
       not refer to an initialized thread attributes object.

RETURN VALUE         top

       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         top

       The pthread_attr_setschedparam() function shall fail if:

              An attempt was made to set the attribute to an unsupported

       The pthread_attr_setschedparam() function may fail if:

       EINVAL The value of param is not valid.

       These functions shall not return an error code of [EINTR].

       The following sections are informative.

EXAMPLES         top



       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         top

       If an implementation detects that the value specified by the attr
       argument to pthread_attr_getschedparam() or
       pthread_attr_setschedparam() does not refer to an initialized thread
       attributes object, it is recommended that the function should fail
       and report an [EINVAL] error.



SEE ALSO         top

       pthread_attr_destroy(3p), pthread_attr_getscope(3p),
       pthread_attr_getinheritsched(3p), pthread_attr_getschedpolicy(3p),

       The  Base  Definitions   volume   of   POSIX.1‐2008,   pthread.h(0p),

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The Open
       Group Base Specifications Issue 7, Copyright (C) 2013 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
       applied.) 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 .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the
       source files to man page format. To report such errors, see .

IEEE/The Open Group                 2013      PTHREAD_ATTR_GETSCHEDPARAM(3P)

Pages that refer to this page: pthread.h(0p)pthread_attr_getinheritsched(3p)pthread_attr_getschedpolicy(3p)pthread_attr_getscope(3p)pthread_attr_setschedparam(3p)