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

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_getschedpolicy(3p), pthread_create(3p)

       The Base Definitions volume of POSIX.1‐2017, pthread.h(0p),

COPYRIGHT         top

       Portions of this text are reprinted and reproduced in electronic
       form from IEEE Std 1003.1-2017, Standard for Information
       Technology -- Portable Operating System Interface (POSIX), The
       Open Group Base Specifications Issue 7, 2018 Edition, Copyright
       (C) 2018 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 .

       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               2017    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)