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1 perry 1 GET_PRIORITY_MAX
2 !!!GET_PRIORITY_MAX
3 NAME
4 SYNOPSIS
5 DESCRIPTION
6 RETURN VALUE
7 ERRORS
8 CONFORMING TO
9 SEE ALSO
10 ----
11 !!NAME
12
13
14 sched_get_priority_max, sched_get_priority_min - get static priority range
15 !!SYNOPSIS
16
17
18 __#include __
19
20
21 __int sched_get_priority_max(int__
22 ''policy''__);__
23
24
25 __int sched_get_priority_min(int__
26 ''policy''__);__
27 !!DESCRIPTION
28
29
30 __sched_get_priority_max__ returns the maximum priority
31 value that can be used with the scheduling algorithm
32 identified by ''policy''. __sched_get_priority_min__
33 returns the minimum priority value that can be used with the
34 scheduling algorithm identified by ''policy''. Supported
35 ''policy'' values are ''SCHED_FIFO'', ''SCHED_RR'',
36 and ''SCHED_OTHER''.
37
38
39 Processes with numerically higher priority values are
40 scheduled before processes with numerically lower priority
41 values. Thus, the value returned by
42 __sched_get_priority_max__ will be greater than the value
43 returned by __sched_get_priority_min__.
44
45
46 Linux allows the static priority value range 1 to 99 for
47 ''SCHED_FIFO'' and ''SCHED_RR'' and the priority 0 for
48 ''SCHED_OTHER''. Scheduling priority ranges for the
49 various policies are not alterable.
50
51
52 The range of scheduling priorities may vary on other POSIX
53 systems, thus it is a good idea for portable applications to
54 use a virtual priority range and map it to the interval
55 given by __sched_get_priority_max__ and
56 __sched_get_priority_min__. POSIX.1b requires a spread of
57 at least 32 between the maximum and the minimum values for
58 ''SCHED_FIFO'' and ''SCHED_RR''.
59
60
61 POSIX systems on which __sched_get_priority_max__ and
62 __sched_get_priority_min__ are available define
63 ''_POSIX_PRIORITY_SCHEDULING'' in
64 ''
65 !!RETURN VALUE
66
67
68 On success, __sched_get_priority_max__ and
69 __sched_get_priority_min__ return the maximum/minimum
70 priority value for the named scheduling policy. On error, -1
71 is returned, ''errno'' is set appropriately.
72 !!ERRORS
73
74
75 __EINVAL__
76
77
78 The parameter ''policy'' does not identify a defined
79 scheduling policy.
80 !!CONFORMING TO
81
82
83 POSIX.1b (formerly POSIX.4)
84 !!SEE ALSO
85
86
4 perry 87 sched_setscheduler(2), __sched_getscheduler__(2),
88 sched_setparam(2),
89 sched_getparam(2)
1 perry 90
91
4 perry 92 sched_setscheduler(2) has a description of the Linux
1 perry 93 scheduling scheme.
94
95
96 ''Programming for the real world - POSIX.4'' by Bill O.
97 Gallmeister, O'Reilly
98 ''
99 IEEE Std 1003.1b-1993'' (POSIX.1b standard)''
100 ISO/IEC 9945-1:1996''
101 ----
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