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1 | .\" Copyright (c) 2008 Linux Foundation, written by Michael Kerrisk |
2 | .\" <mtk.manpages@gmail.com> | |
3 | .\" | |
93015253 | 4 | .\" %%%LICENSE_START(VERBATIM) |
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5 | .\" Permission is granted to make and distribute verbatim copies of this |
6 | .\" manual provided the copyright notice and this permission notice are | |
7 | .\" preserved on all copies. | |
8 | .\" | |
9 | .\" Permission is granted to copy and distribute modified versions of this | |
10 | .\" manual under the conditions for verbatim copying, provided that the | |
11 | .\" entire resulting derived work is distributed under the terms of a | |
12 | .\" permission notice identical to this one. | |
13 | .\" | |
14 | .\" Since the Linux kernel and libraries are constantly changing, this | |
15 | .\" manual page may be incorrect or out-of-date. The author(s) assume no | |
16 | .\" responsibility for errors or omissions, or for damages resulting from | |
17 | .\" the use of the information contained herein. The author(s) may not | |
18 | .\" have taken the same level of care in the production of this manual, | |
19 | .\" which is licensed free of charge, as they might when working | |
20 | .\" professionally. | |
21 | .\" | |
22 | .\" Formatted or processed versions of this manual, if unaccompanied by | |
23 | .\" the source, must acknowledge the copyright and authors of this work. | |
4b72fb64 | 24 | .\" %%%LICENSE_END |
b326494c | 25 | .\" |
f9293d98 | 26 | .TH PTHREAD_ATTR_SETSCHEDPARAM 3 2013-06-21 "Linux" "Linux Programmer's Manual" |
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27 | .SH NAME |
28 | pthread_attr_setschedparam, pthread_attr_getschedparam \- set/get | |
29 | scheduling parameter attributes in thread attributes object | |
30 | .SH SYNOPSIS | |
31 | .nf | |
32 | .B #include <pthread.h> | |
33 | ||
34 | .BI "int pthread_attr_setschedparam(pthread_attr_t *" attr , | |
35 | .BI " const struct sched_param *" param ); | |
36 | .BI "int pthread_attr_getschedparam(pthread_attr_t *" attr , | |
37 | .BI " struct sched_param *" param ); | |
38 | .sp | |
39 | Compile and link with \fI\-pthread\fP. | |
6030f2d8 | 40 | .fi |
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41 | .SH DESCRIPTION |
42 | The | |
43 | .BR pthread_attr_setschedparam () | |
44 | function sets the scheduling parameter attributes of the | |
45 | thread attributes object referred to by | |
3ab624b6 | 46 | .IR attr |
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47 | to the values specified in the buffer pointed to by |
48 | .IR param . | |
49 | These attributes determine the scheduling parameters of | |
50 | a thread created using the thread attributes object | |
51 | .IR attr . | |
52 | ||
53 | The | |
54 | .BR pthread_attr_getschedparam () | |
55 | returns the scheduling parameter attributes of the thread attributes object | |
56 | .IR attr | |
57 | in the buffer pointed to by | |
58 | .IR param . | |
59 | ||
60 | Scheduling parameters are maintained in the following structure: | |
61 | ||
62 | .in +4n | |
63 | .nf | |
64 | struct sched_param { | |
65 | int sched_priority; /* Scheduling priority */ | |
66 | }; | |
67 | .fi | |
68 | .in | |
69 | ||
4c5f5413 | 70 | As can be seen, only one scheduling parameter is supported. |
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71 | For details of the permitted ranges for scheduling priorities |
72 | in each scheduling policy, see | |
73 | .BR sched_setscheduler (2). | |
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74 | |
75 | In order for the parameter setting made by | |
76 | .BR pthread_attr_setschedparam () | |
77 | to have effect when calling | |
78 | .BR pthread_create (3), | |
79 | the caller must use | |
80 | .BR pthread_attr_setinheritsched (3) | |
81 | to set the inherit-scheduler attribute of the attributes object | |
82 | .I attr | |
83 | to | |
84 | .BR PTHREAD_EXPLICIT_SCHED . | |
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85 | .SH RETURN VALUE |
86 | On success, these functions return 0; | |
c7094399 | 87 | on error, they return a nonzero error number. |
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88 | .SH ERRORS |
89 | POSIX.1 documents | |
90 | .B EINVAL | |
91 | and | |
92 | .B ENOTSUP | |
93 | errors for | |
94 | .BR pthread_attr_setschedparam (). | |
95 | On Linux these functions always succeed | |
96 | (but portable and future-proof applications should nevertheless | |
97 | handle a possible error return). | |
98 | .\" .SH VERSIONS | |
99 | .\" Available since glibc 2.0. | |
100 | .SH CONFORMING TO | |
101 | POSIX.1-2001. | |
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102 | .SH NOTES |
103 | See | |
104 | .BR pthread_attr_setschedpolicy (3) | |
105 | for a list of the thread scheduling policies supported on Linux. | |
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106 | .SH EXAMPLE |
107 | See | |
108 | .BR pthread_setschedparam (3). | |
b326494c | 109 | .SH SEE ALSO |
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110 | .ad l |
111 | .nh | |
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112 | .BR sched_get_priority_min (2), |
113 | .BR sched_setscheduler (2), | |
114 | .BR pthread_attr_init (3), | |
115 | .BR pthread_attr_setinheritsched (3), | |
116 | .BR pthread_attr_setschedpolicy (3), | |
117 | .BR pthread_create (3), | |
118 | .BR pthread_setschedparam (3), | |
119 | .BR pthread_setschedprio (3), | |
120 | .BR pthreads (7) |