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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 19:40:15 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 19:40:15 +0000 |
commit | 399644e47874bff147afb19c89228901ac39340e (patch) | |
tree | 1c4c0b733f4c16b5783b41bebb19194a9ef62ad1 /man2/sched_get_priority_max.2 | |
parent | Initial commit. (diff) | |
download | manpages-399644e47874bff147afb19c89228901ac39340e.tar.xz manpages-399644e47874bff147afb19c89228901ac39340e.zip |
Adding upstream version 6.05.01.upstream/6.05.01
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'man2/sched_get_priority_max.2')
-rw-r--r-- | man2/sched_get_priority_max.2 | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/man2/sched_get_priority_max.2 b/man2/sched_get_priority_max.2 new file mode 100644 index 0000000..491e134 --- /dev/null +++ b/man2/sched_get_priority_max.2 @@ -0,0 +1,112 @@ +.\" Copyright (C) Tom Bjorkholm & Markus Kuhn, 1996 +.\" +.\" SPDX-License-Identifier: GPL-2.0-or-later +.\" +.\" 1996-04-01 Tom Bjorkholm <tomb@mydata.se> +.\" First version written +.\" 1996-04-10 Markus Kuhn <mskuhn@cip.informatik.uni-erlangen.de> +.\" revision +.\" +.TH sched_get_priority_max 2 2023-03-30 "Linux man-pages 6.05.01" +.SH NAME +sched_get_priority_max, sched_get_priority_min \- get static priority range +.SH LIBRARY +Standard C library +.RI ( libc ", " \-lc ) +.SH SYNOPSIS +.nf +.B #include <sched.h> +.PP +.BI "int sched_get_priority_max(int " policy ); +.BI "int sched_get_priority_min(int " policy ); +.fi +.SH DESCRIPTION +.BR sched_get_priority_max () +returns the maximum priority value that can be used with the +scheduling algorithm identified by +.IR policy . +.BR sched_get_priority_min () +returns the minimum priority value that can be used with the +scheduling algorithm identified by +.IR policy . +Supported +.I policy +values are +.BR SCHED_FIFO , +.BR SCHED_RR , +.BR SCHED_OTHER , +.BR SCHED_BATCH , +.BR SCHED_IDLE , +and +.BR SCHED_DEADLINE . +Further details about these policies can be found in +.BR sched (7). +.PP +Processes with numerically higher priority values are scheduled before +processes with numerically lower priority values. +Thus, the value +returned by +.BR sched_get_priority_max () +will be greater than the +value returned by +.BR sched_get_priority_min (). +.PP +Linux allows the static priority range 1 to 99 for the +.B SCHED_FIFO +and +.B SCHED_RR +policies, and the priority 0 for the remaining policies. +Scheduling priority ranges for the various policies +are not alterable. +.PP +The range of scheduling priorities may vary on other POSIX systems, +thus it is a good idea for portable applications to use a virtual +priority range and map it to the interval given by +.BR sched_get_priority_max () +and +.BR sched_get_priority_min () +POSIX.1 requires +.\" POSIX.1-2001, POSIX.1-2008 (XBD 2.8.4) +a spread of at least 32 between the maximum and the minimum values for +.B SCHED_FIFO +and +.BR SCHED_RR . +.PP +POSIX systems on which +.BR sched_get_priority_max () +and +.BR sched_get_priority_min () +are available define +.B _POSIX_PRIORITY_SCHEDULING +in +.IR <unistd.h> . +.SH RETURN VALUE +On success, +.BR sched_get_priority_max () +and +.BR sched_get_priority_min () +return the maximum/minimum priority value for the named scheduling +policy. +On error, \-1 is returned, and +.I errno +is set to indicate the error. +.SH ERRORS +.TP +.B EINVAL +The argument +.I policy +does not identify a defined scheduling policy. +.SH STANDARDS +POSIX.1-2008. +.SH HISTORY +POSIX.1-2001. +.SH SEE ALSO +.ad l +.nh +.BR sched_getaffinity (2), +.BR sched_getparam (2), +.BR sched_getscheduler (2), +.BR sched_setaffinity (2), +.BR sched_setparam (2), +.BR sched_setscheduler (2), +.BR sched (7) |