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1 perry 1 SCHED_SETPARAM
2 !!!SCHED_SETPARAM
3 NAME
4 SYNOPSIS
5 DESCRIPTION
6 RETURN VALUE
7 ERRORS
8 CONFORMING TO
9 SEE ALSO
10 ----
11 !!NAME
12
13
14 sched_setparam, sched_getparam - set and get scheduling parameters
15 !!SYNOPSIS
16
17
18 __#include __
19
20
21 __int sched_setparam(pid_t__ ''pid''__, const struct
22 sched_param *__''p''__);__
23
24
25 __int sched_getparam(pid_t__ ''pid''__, struct
26 sched_param *__''p''__);__
27
28
29 struct sched_param {
30 ...
31 int ''sched_priority''__;
32 ...
33 };
34 __
35 !!DESCRIPTION
36
37
38 __sched_setparam__ sets the scheduling parameters
39 associated with the scheduling policy for the process
40 identified by ''pid''. If ''pid'' is zero, then the
41 parameters of the current process are set. The
42 interpretation of the parameter ''p'' depends on the
43 selected policy. Currently, the following three scheduling
44 policies are supported under Linux: ''SCHED_FIFO'',
45 ''SCHED_RR'', and ''SCHED_OTHER.''
46
47
48 __sched_getparam__ retrieves the scheduling parameters
49 for the process identified by ''pid''. If ''pid'' is
50 zero, then the parameters of the current process are
51 retrieved.
52
53
54 __sched_setparam__ checks the validity of ''p'' for
55 the scheduling policy of the process. The parameter
56 ''p-'' must lie within the range given
57 by __sched_get_priority_min__ and
58 __sched_get_priority_max__.
59
60
61 POSIX systems on which __sched_setparam__ and
62 __sched_getparam__ are available define
63 ''_POSIX_PRIORITY_SCHEDULING'' in
64 ''
65 !!RETURN VALUE
66
67
68 On success, __sched_setparam__ and __sched_getparam__
69 return 0. On error, -1 is returned, ''errno'' is set
70 appropriately.
71 !!ERRORS
72
73
74 __ESRCH__
75
76
77 The process whose ID is ''pid'' could not be
78 found.
79
80
81 __EPERM__
82
83
84 The calling process does not have appropriate privileges.
85 The process calling __sched_setparam__ needs an effective
86 uid equal to the euid or uid of the process identified by
87 ''pid'', or it must be a superuser process.
88
89
90 __EINVAL__
91
92
93 The parameter ''p'' does not make sense for the current
94 scheduling policy.
95 !!CONFORMING TO
96
97
98 POSIX.1b (formerly POSIX.4)
99 !!SEE ALSO
100
101
4 perry 102 sched_setscheduler(2), __sched_getscheduler__(2),
103 sched_get_priority_max(2),
104 sched_get_priority_min(2), nice(2),
1 perry 105 setpriority(2), getpriority(2),
106
107
4 perry 108 sched_setscheduler(2) has a description of the Linux
1 perry 109 scheduling scheme.
110
111
112 ''Programming for the real world - POSIX.4'' by Bill O.
113 Gallmeister, O'Reilly
114 ''
115 IEEE Std 1003.1b-1993'' (POSIX.1b standard)''
116 ISO/IEC 9945-1:1996''
117 ----
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