pthread_getschedparam man page on Archlinux

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       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.

       pthread_getschedparam, pthread_setschedparam — dynamic thread  schedul‐
       ing parameters access (REALTIME THREADS)

       #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);

       The   pthread_getschedparam()   and  pthread_setschedparam()  functions
       shall, respectively, get and set the scheduling policy  and  parameters
       of  individual  threads within a multi-threaded process to be retrieved
       and set. For SCHED_FIFO and SCHED_RR, the only required member  of  the
       sched_param structure is the priority sched_priority.  For SCHED_OTHER,
       the affected scheduling parameters are implementation-defined.

       The pthread_getschedparam() function shall retrieve the scheduling pol‐
       icy  and	 scheduling parameters for the thread whose thread ID is given
       by thread and shall store those values in  policy  and  param,  respec‐
       tively.	The priority value returned from pthread_getschedparam() shall
       be the value specified  by  the	most  recent  pthread_setschedparam(),
       pthread_setschedprio(),	or  pthread_create() call affecting the target
       thread. It shall not reflect any temporary adjustments to its  priority
       as  a  result  of  any  priority	 inheritance or ceiling functions. The
       pthread_setschedparam() function shall set 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.

       The  policy  parameter  may  have the value SCHED_OTHER, SCHED_FIFO, or
       SCHED_RR. The scheduling parameters  for	 the  SCHED_OTHER  policy  are
       implementation-defined. The SCHED_FIFO and SCHED_RR policies shall have
       a single scheduling parameter, priority.

       If _POSIX_THREAD_SPORADIC_SERVER is defined, then the  policy  argument
       may   have  the	value  SCHED_SPORADIC,	with  the  exception  for  the
       pthread_setschedparam() function that if the scheduling policy was  not
       SCHED_SPORADIC  at  the	time of the call, it is implementation-defined
       whether the function is supported; in other words,  the	implementation
       need  not  allow	 the  application to dynamically change the scheduling
       policy to SCHED_SPORADIC. The sporadic server scheduling policy has the
       associated   parameters	 sched_ss_low_priority,	 sched_ss_repl_period,
       sched_ss_init_budget, sched_priority, and sched_ss_max_repl.  The spec‐
       ified sched_ss_repl_period shall be greater than or equal to the speci‐
       fied 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  suc‐
       ceed;  if  not, the function shall fail.	 It is unspecified whether the
       sched_ss_repl_period and sched_ss_init_budget values are stored as pro‐
       vided  by  this function or are rounded to align with the resolution of
       the clock being used.

       If the pthread_setschedparam() function fails, the  scheduling  parame‐
       ters shall not be changed for the target thread.

       If  successful, the pthread_getschedparam() and pthread_setschedparam()
       functions shall return  zero;  otherwise,  an  error  number  shall  be
       returned to indicate the error.

       The pthread_setschedparam() function shall fail if:

	      An  attempt  was made to set the policy or scheduling parameters
	      to an unsupported value.

	      An attempt was made to dynamically change the scheduling	policy
	      to  SCHED_SPORADIC, and the implementation does not support this

       The pthread_setschedparam() function may fail if:

       EINVAL The value specified by policy or one of the  scheduling  parame‐
	      ters associated with the scheduling policy policy is invalid.

       EPERM  The  caller  does	 not have appropriate privileges to set either
	      the scheduling parameters or the scheduling policy of the speci‐
	      fied thread.

       EPERM  The  implementation does not allow the application to modify one
	      of the parameters to the value specified.

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

       The following sections are informative.



       If an implementation detects use of a thread ID after the  end  of  its
       lifetime, it is recommended that the function should fail and report an
       [ESRCH] error.


       pthread_setschedprio(), sched_getparam(), sched_getscheduler()

       The Base Definitions volume of POSIX.1‐2008, <pthread.h>, <sched.h>

       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 Electri‐
       cal 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 https://www.ker‐ .

IEEE/The Open Group		     2013	     PTHREAD_GETSCHEDPARAM(3P)

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