1 .\" Copyright (C) Tom Bjorkholm & Markus Kuhn, 1996
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24 .\" 1996-04-01 Tom Bjorkholm <tomb@mydata.se>
25 .\" First version written
26 .\" 1996-04-10 Markus Kuhn <mskuhn@cip.informatik.uni-erlangen.de>
29 .TH SCHED_GET_PRIORITY_MAX 2 2021-03-22 "Linux" "Linux Programmer's Manual"
31 sched_get_priority_max, sched_get_priority_min \- get static priority range
36 .BI "int sched_get_priority_max(int " policy );
37 .BI "int sched_get_priority_min(int " policy );
40 .BR sched_get_priority_max ()
41 returns the maximum priority value that can be used with the
42 scheduling algorithm identified by
44 .BR sched_get_priority_min ()
45 returns the minimum priority value that can be used with the
46 scheduling algorithm identified by
58 Further details about these policies can be found in
61 Processes with numerically higher priority values are scheduled before
62 processes with numerically lower priority values.
65 .BR sched_get_priority_max ()
66 will be greater than the
68 .BR sched_get_priority_min ().
70 Linux allows the static priority range 1 to 99 for the
74 policies, and the priority 0 for the remaining policies.
75 Scheduling priority ranges for the various policies
78 The range of scheduling priorities may vary on other POSIX systems,
79 thus it is a good idea for portable applications to use a virtual
80 priority range and map it to the interval given by
81 .BR sched_get_priority_max ()
83 .BR sched_get_priority_min
85 .\" POSIX.1-2001, POSIX.1-2008 (XBD 2.8.4)
86 a spread of at least 32 between the maximum and the minimum values for
91 POSIX systems on which
92 .BR sched_get_priority_max ()
94 .BR sched_get_priority_min ()
96 .B _POSIX_PRIORITY_SCHEDULING
101 .BR sched_get_priority_max ()
103 .BR sched_get_priority_min ()
104 return the maximum/minimum priority value for the named scheduling
106 On error, \-1 is returned, and
108 is set to indicate the error.
114 does not identify a defined scheduling policy.
116 POSIX.1-2001, POSIX.1-2008.
120 .BR sched_getaffinity (2),
121 .BR sched_getparam (2),
122 .BR sched_getscheduler (2),
123 .BR sched_setaffinity (2),
124 .BR sched_setparam (2),
125 .BR sched_setscheduler (2),