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Linux 2.6 - man page for pthread_setschedparam (linux section 3posix)


       pthread_getschedparam, pthread_setschedparam - dynamic thread scheduling parameters access

       #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 policy  and  scheduling
       parameters  for the thread whose thread ID is given by thread and shall store those values
       in policy and param, respectively. The  priority  value	returned  from	pthread_getsched-
       param()	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 schedul-
       ing  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
       specified   sched_ss_repl_period   shall  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.

       If the pthread_setschedparam() function fails, the  scheduling  parameters  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_getschedparam() function may fail if:

       ESRCH  The value specified by thread does not refer to an existing thread.

       The pthread_setschedparam() function may fail if:

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

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

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

       EPERM  The  caller  does  not have the appropriate permission to set either the scheduling
	      parameters or the scheduling policy of the specified thread.

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

       ESRCH  The value specified by thread does not refer to a existing thread.

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

       The following sections are informative.





       pthread_setschedprio()  ,  sched_getparam()  , sched_getscheduler() , the Base Definitions
       volume of IEEE Std 1003.1-2001, <pthread.h>, <sched.h>

       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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003			 PTHREAD_GETSCHEDPARAM(P)

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