sched_getparam(2) [redhat man page]
SCHED_SETPARAM(2) Linux Programmer's Manual SCHED_SETPARAM(2) NAME
sched_setparam, sched_getparam - set and get scheduling parameters SYNOPSIS
#include <sched.h> int sched_setparam(pid_t pid, const struct sched_param *p); int sched_getparam(pid_t pid, struct sched_param *p); struct sched_param { ... int sched_priority; ... }; DESCRIPTION
sched_setparam sets the scheduling parameters associated with the scheduling policy for the process identified by pid. If pid is zero, then the parameters of the current process are set. The interpretation of the parameter p depends on the selected policy. Currently, the follow- ing three scheduling policies are supported under Linux: SCHED_FIFO, SCHED_RR, and SCHED_OTHER. sched_getparam retrieves the scheduling parameters for the process identified by pid. If pid is zero, then the parameters of the current process are retrieved. sched_setparam checks the validity of p for the scheduling policy of the process. The parameter p->sched_priority must lie within the range given by sched_get_priority_min and sched_get_priority_max. POSIX systems on which sched_setparam and sched_getparam are available define _POSIX_PRIORITY_SCHEDULING in <unistd.h>. RETURN VALUE
On success, sched_setparam and sched_getparam return 0. On error, -1 is returned, errno is set appropriately. ERRORS
ESRCH The process whose ID is pid could not be found. EPERM The calling process does not have appropriate privileges. The process calling sched_setparam needs an effective uid equal to the euid or uid of the process identified by pid, or it must be a superuser process. EINVAL The parameter p does not make sense for the current scheduling policy. CONFORMING TO
POSIX.1b (formerly POSIX.4) SEE ALSO
sched_setscheduler(2), sched_getscheduler(2), sched_get_priority_max(2), sched_get_priority_min(2), nice(2), setpriority(2), getprior- ity(2), sched_setscheduler(2) has a description of the Linux scheduling scheme. Programming for the real world - POSIX.4 by Bill O. Gallmeister, O'Reilly & Associates, Inc., ISBN 1-56592-074-0 IEEE Std 1003.1b-1993 (POSIX.1b standard) ISO/IEC 9945-1:1996 Linux 1.3.81 1996-04-10 SCHED_SETPARAM(2)
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SCHED_SETPARAM(2) Linux Programmer's Manual SCHED_SETPARAM(2) NAME
sched_setparam, sched_getparam - set and get scheduling parameters SYNOPSIS
#include <sched.h> int sched_setparam(pid_t pid, const struct sched_param *param); int sched_getparam(pid_t pid, struct sched_param *param); struct sched_param { ... int sched_priority; ... }; DESCRIPTION
sched_setparam() sets the scheduling parameters associated with the scheduling policy for the process identified by pid. If pid is zero, then the parameters of the calling process are set. The interpretation of the argument param depends on the scheduling policy of the process identified by pid. See sched_setscheduler(2) for a description of the scheduling policies supported under Linux. sched_getparam() retrieves the scheduling parameters for the process identified by pid. If pid is zero, then the parameters of the calling process are retrieved. sched_setparam() checks the validity of param for the scheduling policy of the process. The value param->sched_priority must lie within the range given by sched_get_priority_min(2) and sched_get_priority_max(2). For a discussion of the privileges and resource limits related to scheduling priority and policy, see sched_setscheduler(2). POSIX systems on which sched_setparam() and sched_getparam() are available define _POSIX_PRIORITY_SCHEDULING in <unistd.h>. RETURN VALUE
On success, sched_setparam() and sched_getparam() return 0. On error, -1 is returned, and errno is set appropriately. ERRORS
EINVAL The argument param does not make sense for the current scheduling policy. EPERM The calling process does not have appropriate privileges (Linux: does not have the CAP_SYS_NICE capability). ESRCH The process whose ID is pid could not be found. CONFORMING TO
POSIX.1-2001. SEE ALSO
getpriority(2), nice(2), sched_get_priority_max(2), sched_get_priority_min(2), sched_getaffinity(2), sched_getscheduler(2), sched_setaffin- ity(2), sched_setscheduler(2), setpriority(2), capabilities(7) Programming for the real world - POSIX.4 by Bill O. Gallmeister, O'Reilly & Associates, Inc., ISBN 1-56592-074-0 COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. Linux 2006-03-23 SCHED_SETPARAM(2)