pthread_attr_setinheritsched(3) - Linux manual page (original) (raw)
pthreada...eritsched(3) Library Functions Manual_pthreada...eritsched_(3)
NAME top
pthread_attr_setinheritsched, pthread_attr_getinheritsched -
set/get inherit-scheduler attribute in thread attributes objectLIBRARY top
POSIX threads library (_libpthread_, _-lpthread_)SYNOPSIS top
**#include <pthread.h>**
**int pthread_attr_setinheritsched(pthread_attr_t ***_attr_**,**
**int** _inheritsched_**);**
**int pthread_attr_getinheritsched(const pthread_attr_t *restrict** _attr_**,**
**int *restrict** _inheritsched_**);**DESCRIPTION top
The **pthread_attr_setinheritsched**() function sets the inherit-
scheduler attribute of the thread attributes object referred to by
_attr_ to the value specified in _inheritsched_. The inherit-
scheduler attribute determines whether a thread created using the
thread attributes object _attr_ will inherit its scheduling
attributes from the calling thread or whether it will take them
from _attr_.
The following scheduling attributes are affected by the inherit-
scheduler attribute: scheduling policy
([pthread_attr_setschedpolicy(3)](../man3/pthread%5Fattr%5Fsetschedpolicy.3.html)), scheduling priority
([pthread_attr_setschedparam(3)](../man3/pthread%5Fattr%5Fsetschedparam.3.html)), and contention scope
([pthread_attr_setscope(3)](../man3/pthread%5Fattr%5Fsetscope.3.html)).
The following values may be specified in _inheritsched_:
**PTHREAD_INHERIT_SCHED**
Threads that are created using _attr_ inherit scheduling
attributes from the creating thread; the scheduling
attributes in _attr_ are ignored.
**PTHREAD_EXPLICIT_SCHED**
Threads that are created using _attr_ take their scheduling
attributes from the values specified by the attributes
object.
The default setting of the inherit-scheduler attribute in a newly
initialized thread attributes object is **PTHREAD_INHERIT_SCHED**.
The **pthread_attr_getinheritsched**() returns the inherit-scheduler
attribute of the thread attributes object _attr_ in the buffer
pointed to by _inheritsched_.RETURN VALUE top
On success, these functions return 0; on error, they return a
nonzero error number.ERRORS top
**pthread_attr_setinheritsched**() can fail with the following error:
**EINVAL** Invalid value in _inheritsched_.
POSIX.1 also documents an optional **ENOTSUP** error ("attempt was
made to set the attribute to an unsupported value") for
**pthread_attr_setinheritsched**().ATTRIBUTES top
For an explanation of the terms used in this section, see
[attributes(7)](../man7/attributes.7.html).
┌──────────────────────────────────────┬───────────────┬─────────┐
│ **Interface** │ **Attribute** │ **Value** │
├──────────────────────────────────────┼───────────────┼─────────┤
│ **pthread_attr_setinheritsched**(), │ Thread safety │ MT-Safe │
│ **pthread_attr_getinheritsched**() │ │ │
└──────────────────────────────────────┴───────────────┴─────────┘STANDARDS top
POSIX.1-2008.HISTORY top
glibc 2.0. POSIX.1-2001.BUGS top
As at glibc 2.8, if a thread attributes object is initialized
using [pthread_attr_init(3)](../man3/pthread%5Fattr%5Finit.3.html), then the scheduling policy of the
attributes object is set to **SCHED_OTHER** and the scheduling
priority is set to 0. However, if the inherit-scheduler attribute
is then set to **PTHREAD_EXPLICIT_SCHED**, then a thread created using
the attribute object wrongly inherits its scheduling attributes
from the creating thread. This bug does not occur if either the
scheduling policy or scheduling priority attribute is explicitly
set in the thread attributes object before calling
[pthread_create(3)](../man3/pthread%5Fcreate.3.html).EXAMPLES top
See [pthread_setschedparam(3)](../man3/pthread%5Fsetschedparam.3.html).SEE ALSO top
[pthread_attr_init(3)](../man3/pthread%5Fattr%5Finit.3.html), [pthread_attr_setschedparam(3)](../man3/pthread%5Fattr%5Fsetschedparam.3.html),
[pthread_attr_setschedpolicy(3)](../man3/pthread%5Fattr%5Fsetschedpolicy.3.html), [pthread_attr_setscope(3)](../man3/pthread%5Fattr%5Fsetscope.3.html),
[pthread_create(3)](../man3/pthread%5Fcreate.3.html), [pthread_setschedparam(3)](../man3/pthread%5Fsetschedparam.3.html),
[pthread_setschedprio(3)](../man3/pthread%5Fsetschedprio.3.html), [pthreads(7)](../man7/pthreads.7.html), [sched(7)](../man7/sched.7.html)COLOPHON top
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man-pages@man7.orgLinux man-pages 6.10 2024-07-23 pthreada...eritsched(3)
Pages that refer to this page:pthread_attr_init(3), pthread_attr_setschedparam(3), pthread_attr_setschedpolicy(3), pthread_attr_setscope(3), pthread_getattr_default_np(3), pthread_getattr_np(3), pthread_setschedparam(3), pthread_setschedprio(3)