pthread_attr_getinheritsched(3)

1PTHREAD_ATTR_SETINHERITSCHEDL(i3n)ux Programmer's MaPnTuHaRlEAD_ATTR_SETINHERITSCHED(3)
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NAME

6       pthread_attr_setinheritsched,  pthread_attr_getinheritsched  -  set/get
7       inherit-scheduler attribute in thread attributes object
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SYNOPSIS

10       #include <pthread.h>
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12       int pthread_attr_setinheritsched(pthread_attr_t *attr,
13                                        int inheritsched);
14       int pthread_attr_getinheritsched(const pthread_attr_t *attr,
15                                        int *inheritsched);
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17       Compile and link with -pthread.
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DESCRIPTION

20       The pthread_attr_setinheritsched() function sets the  inherit-scheduler
21       attribute  of  the  thread attributes object referred to by attr to the
22       value  specified  in  inheritsched.   The  inherit-scheduler  attribute
23       determines  whether a thread created using the thread attributes object
24       attr will inherit its scheduling attributes from the calling thread  or
25       whether it will take them from attr.
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27       The  following scheduling attributes are affected by the inherit-sched‐
28       uler  attribute:  scheduling  policy  (pthread_attr_setschedpolicy(3)),
29       scheduling  priority  (pthread_attr_setschedparam(3)),  and  contention
30       scope (pthread_attr_setscope(3)).
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32       The following values may be specified in inheritsched:
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34       PTHREAD_INHERIT_SCHED
35              Threads  that  are  created  using   attr   inherit   scheduling
36              attributes  from  the creating thread; the scheduling attributes
37              in attr are ignored.
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39       PTHREAD_EXPLICIT_SCHED
40              Threads that  are  created  using  attr  take  their  scheduling
41              attributes from the values specified by the attributes object.
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43       The  default setting of the inherit-scheduler attribute in a newly ini‐
44       tialized thread attributes object is PTHREAD_INHERIT_SCHED.
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46       The  pthread_attr_getinheritsched()   returns   the   inherit-scheduler
47       attribute of the thread attributes object attr in the buffer pointed to
48       by inheritsched.
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RETURN VALUE

51       On success, these functions return 0; on error, they return  a  nonzero
52       error number.
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ERRORS

55       pthread_attr_setinheritsched() can fail with the following error:
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57       EINVAL Invalid value in inheritsched.
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59       POSIX.1  also documents an optional ENOTSUP error ("attempt was made to
60       set the attribute to an unsupported value") for  pthread_attr_setinher‐
61       itsched().
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ATTRIBUTES

64       For   an   explanation   of   the  terms  used  in  this  section,  see
65       attributes(7).
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67       ┌────────────────────────────────┬───────────────┬─────────┐
68       │Interface                       │ Attribute     │ Value   │
69       ├────────────────────────────────┼───────────────┼─────────┤
70       │pthread_attr_setinheritsched(), │ Thread safety │ MT-Safe │
71       │pthread_attr_getinheritsched()  │               │         │
72       └────────────────────────────────┴───────────────┴─────────┘

CONFORMING TO

74       POSIX.1-2001, POSIX.1-2008.
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BUGS

77       As  at  glibc  2.8,  if a thread attributes object is initialized using
78       pthread_attr_init(3), then the  scheduling  policy  of  the  attributes
79       object  is  set to SCHED_OTHER and the scheduling priority is set to 0.
80       However,  if  the  inherit-scheduler   attribute   is   then   set   to
81       PTHREAD_EXPLICIT_SCHED,  then  a  thread  created  using  the attribute
82       object wrongly inherits its scheduling  attributes  from  the  creating
83       thread.   This  bug  does  not occur if either the scheduling policy or
84       scheduling  priority  attribute  is  explicitly  set  in   the   thread
85       attributes object before calling pthread_create(3).
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EXAMPLES

88       See pthread_setschedparam(3).
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COLOPHON

97       This page is part of release 5.07 of the Linux man-pages project.  A
98       description of the project, information about reporting bugs, and the
99       latest version of this page, can be found at
100       https://www.kernel.org/doc/man-pages/.
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104Linux                             2020-06-09   PTHREAD_ATTR_SETINHERITSCHED(3)