sched_setparam(3C)					   Standard C Library Functions 					sched_setparam(3C)

NAME

       sched_setparam - set scheduling parameters

SYNOPSIS

       #include <sched.h>

       int sched_setparam(pid_t pid, const struct sched_param *param);

DESCRIPTION

       The  sched_setparam()  function	sets  the scheduling parameters of the process specified by pid to the values specified by the sched_param
       structure pointed to by param. The value of the sched_priority member in the sched_param structure is any integer within the inclusive pri-
       ority  range  for  the current scheduling policy of the process specified by pid. Higher numerical values for the priority represent higher
       priorities. If the value of pid is negative, the behavior of the sched_setparam() function is unspecified.

       If a process specified by pid exists and if the calling process has permission, the scheduling parameters will be set for the process whose
       process	ID  is	equal to pid. The real or effective user ID of the calling process must match the  real or saved (from exec(2)) user ID of
       the target process unless the effective user ID of the calling process is 0. See Intro(2).

       If pid is zero, the scheduling parameters will be set for the calling process.

       The target process, whether it is running or not running, resumes execution after all other runnable processes of equal or greater priority
       have been scheduled to run.

       If  the	priority  of  the  process specified by the pid argument is set higher than that of the lowest priority running process and if the
       specified process is ready to run, the process specified by the pid argument preempts a lowest priority running process. Similarly, if  the
       process	calling sched_setparam() sets its own priority lower than that of one or more other non-empty process lists, then the process that
       is the head of the highest priority list also preempts the calling process. Thus, in either case, the originating process might not receive
       notification of the completion of the requested priority change until the higher priority process has executed.

RETURN VALUES

       If successful, the sched_setparam() function returns 0.

       If the call to sched_setparam() is unsuccessful, the priority remains unchanged, and the function returns -1 and sets errno to indicate the
       error.

ERRORS

       The sched_setparam() function will fail if:

       EINVAL	 One or more of the requested scheduling parameters is outside the range defined for the scheduling policy of the specified pid.

       EPERM	 The requesting process does not have permission to set the scheduling parameters for the specified process, or does not have  the
		 appropriate privilege to invoke sched_setparam().

       ESRCH	 No process can be found corresponding to that specified by pid.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |ATTRIBUTE TYPE		     |ATTRIBUTE VALUE		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+
       |Standard		     |See standards(5). 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       Intro(2),  exec(2),  librt(3LIB),  sched.h(3HEAD), sched_getparam(3C), sched_getscheduler(3C), sched_setscheduler(3C), attributes(5), stan-
       dards(5)

SunOS 5.11							    1 Apr 2008							sched_setparam(3C)