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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. | |
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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15 | .\" manual page may be incorrect or out-of-date.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 | .\" |
6d322d5f | 26 | .TH PTHREAD_ATTR_SETSCHEDPARAM 3 2015-02-21 "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 ); | |
e59f5f58 | 36 | .BI "int pthread_attr_getschedparam(const pthread_attr_t *" attr , |
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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 | |
25ac8173 | 73 | .BR sched (7). |
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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. |
b326494c | 88 | .SH ERRORS |
3f6dadab TH |
89 | .BR pthread_attr_setschedparam () |
90 | can fail with the following error: | |
91 | .TP | |
b326494c | 92 | .B EINVAL |
ca126346 | 93 | The priority specified in |
3f6dadab TH |
94 | .I param |
95 | does not make sense for the current scheduling policy of | |
96 | .IR attr . | |
97 | .PP | |
98 | POSIX.1 also documents an | |
b326494c | 99 | .B ENOTSUP |
3f6dadab | 100 | error for |
b326494c | 101 | .BR pthread_attr_setschedparam (). |
3f6dadab | 102 | This value is never returned on Linux |
b326494c | 103 | (but portable and future-proof applications should nevertheless |
3f6dadab | 104 | handle this error return value). |
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105 | .\" .SH VERSIONS |
106 | .\" Available since glibc 2.0. | |
6fea3867 PH |
107 | .SH ATTRIBUTES |
108 | .SS Multithreading (see pthreads(7)) | |
109 | The | |
110 | .BR pthread_attr_setschedparam () | |
111 | and | |
112 | .BR pthread_attr_getschedparam () | |
113 | functions are thread-safe. | |
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114 | .SH CONFORMING TO |
115 | POSIX.1-2001. | |
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116 | .SH NOTES |
117 | See | |
118 | .BR pthread_attr_setschedpolicy (3) | |
119 | for a list of the thread scheduling policies supported on Linux. | |
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120 | .SH EXAMPLE |
121 | See | |
122 | .BR pthread_setschedparam (3). | |
b326494c | 123 | .SH SEE ALSO |
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124 | .ad l |
125 | .nh | |
b326494c | 126 | .BR sched_get_priority_min (2), |
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127 | .BR pthread_attr_init (3), |
128 | .BR pthread_attr_setinheritsched (3), | |
129 | .BR pthread_attr_setschedpolicy (3), | |
130 | .BR pthread_create (3), | |
131 | .BR pthread_setschedparam (3), | |
132 | .BR pthread_setschedprio (3), | |
298f72af | 133 | .BR pthreads (7), |
25ac8173 | 134 | .BR sched (7) |