aboutsummaryrefslogtreecommitdiff
path: root/linuxthreads/man/pthread_setschedparam.man
blob: 3992927837111cf87ec294fdf0475cf0dbdd358d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
.TH PTHREAD_SETSCHEDPARAM 3 LinuxThreads

.XREF pthread_getschedparam

.SH NAME
pthread_setschedparam, pthread_getschedparam \- control thread scheduling parameters

.SH SYNOPSIS
#include <pthread.h>

int pthread_setschedparam(pthread_t target_thread, int policy, const struct sched_param *param);

int pthread_getschedparam(pthread_t target_thread, int *policy, struct sched_param *param);

.SH DESCRIPTION

!pthread_setschedparam! sets the scheduling parameters for the thread
|target_thread| as indicated by |policy| and |param|. |policy| can be
either !SCHED_OTHER! (regular, non-realtime scheduling), !SCHED_RR!
(realtime, round-robin) or !SCHED_FIFO! (realtime, first-in
first-out). |param| specifies the scheduling priority for the two
realtime policies.  See !sched_setpolicy!(2) for more information on
scheduling policies.

The realtime scheduling policies !SCHED_RR! and !SCHED_FIFO! are
available only to processes with superuser privileges.

!pthread_getschedparam! retrieves the scheduling policy and scheduling
parameters for the thread |target_thread| and store them in the
locations pointed to by |policy| and |param|, respectively.

.SH "RETURN VALUE"
!pthread_setschedparam! and !pthread_getschedparam! return 0 on
success and a non-zero error code on error.

.SH ERRORS
On error, !pthread_setschedparam! returns the following error codes:
.RS
.TP
!EINVAL!
|policy| is not one of !SCHED_OTHER!, !SCHED_RR!, !SCHED_FIFO!

.TP
!EINVAL!
the priority value specified by |param| is not valid for the specified policy

.TP
!EPERM!
the calling process does not have superuser permissions

.TP
!ESRCH!
the |target_thread| is invalid or has already terminated

.TP
!EFAULT!
|param| points outside the process memory space
.RE

On error, !pthread_getschedparam! returns the following error codes:
.RS
.TP
!ESRCH!
the |target_thread| is invalid or has already terminated

.TP
!EFAULT!
|policy| or |param| point outside the process memory space
.RE

.SH AUTHOR
Xavier Leroy <Xavier.Leroy@inria.fr>

.SH "SEE ALSO"
!sched_setscheduler!(2),
!sched_getscheduler!(2),
!sched_getparam!(2),
!pthread_attr_setschedpolicy!(3),
!pthread_attr_setschedparam!(3).