1PTHREAD_ATTR_GETSCHEDPARAM(PP)OSIX Programmer's ManuPaTlHREAD_ATTR_GETSCHEDPARAM(P)
2
3
4
6 pthread_attr_getschedparam, pthread_attr_setschedparam - get and set
7 the schedparam attribute
8
10 #include <pthread.h>
11
12 int pthread_attr_getschedparam(const pthread_attr_t *restrict attr,
13 struct sched_param *restrict param);
14 int pthread_attr_setschedparam(pthread_attr_t *restrict attr,
15 const struct sched_param *restrict param);
16
17
19 The pthread_attr_getschedparam(), and pthread_attr_setschedparam()
20 functions, respectively, shall get and set the scheduling parameter
21 attributes in the attr argument. The contents of the param structure
22 are defined in the <sched.h> header. For the SCHED_FIFO and SCHED_RR
23 policies, the only required member of param is sched_priority.
24
25 For the SCHED_SPORADIC policy, the required members of the param struc‐
26 ture are sched_priority, sched_ss_low_priority, sched_ss_repl_period,
27 sched_ss_init_budget, and sched_ss_max_repl. The specified
28 sched_ss_repl_period must be greater than or equal to the specified
29 sched_ss_init_budget for the function to succeed; if it is not, then
30 the function shall fail. The value of sched_ss_max_repl shall be within
31 the inclusive range [1, {SS_REPL_MAX}] for the function to succeed; if
32 not, the function shall fail.
33
35 If successful, the pthread_attr_getschedparam() and
36 pthread_attr_setschedparam() functions shall return zero; otherwise, an
37 error number shall be returned to indicate the error.
38
40 The pthread_attr_setschedparam() function may fail if:
41
42 EINVAL The value of param is not valid.
43
44 ENOTSUP
45 An attempt was made to set the attribute to an unsupported
46 value.
47
48
49 These functions shall not return an error code of [EINTR].
50
51 The following sections are informative.
52
54 None.
55
57 After these attributes have been set, a thread can be created with the
58 specified attributes using pthread_create(). Using these routines does
59 not affect the current running thread.
60
62 None.
63
65 None.
66
68 pthread_attr_destroy() , pthread_attr_getscope() , pthread_attr_get‐
69 inheritsched() , pthread_attr_getschedpolicy() , pthread_create() , the
70 Base Definitions volume of IEEE Std 1003.1-2001, <pthread.h>, <sched.h>
71
73 Portions of this text are reprinted and reproduced in electronic form
74 from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
75 -- Portable Operating System Interface (POSIX), The Open Group Base
76 Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
77 Electrical and Electronics Engineers, Inc and The Open Group. In the
78 event of any discrepancy between this version and the original IEEE and
79 The Open Group Standard, the original IEEE and The Open Group Standard
80 is the referee document. The original Standard can be obtained online
81 at http://www.opengroup.org/unix/online.html .
82
83
84
85IEEE/The Open Group 2003 PTHREAD_ATTR_GETSCHEDPARAM(P)