pthread_attr_setinheritsched(3) — Linux manual page

pthread_...ritsched(3)  Library Functions Manual  pthread_...ritsched(3)

NAME

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

LIBRARY

       POSIX threads library (libpthread, -lpthread)

SYNOPSIS

       #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

       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)), scheduling priority
       (pthread_attr_setschedparam(3)), and contention scope
       (pthread_attr_setscope(3)).

       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

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

ERRORS

       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

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

STANDARDS

       POSIX.1-2008.

HISTORY

       glibc 2.0.  POSIX.1-2001.

BUGS

       As at glibc 2.8, if a thread attributes object is initialized
       using pthread_attr_init(3), 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).

EXAMPLES

       See pthread_setschedparam(3).

SEE ALSO

       pthread_attr_init(3), pthread_attr_setschedparam(3),
       pthread_attr_setschedpolicy(3), pthread_attr_setscope(3),
       pthread_create(3), pthread_setschedparam(3),
       pthread_setschedprio(3), pthreads(7), sched(7)

COLOPHON

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Linux man-pages 6.9.1          2024-05-02         pthread_...ritsched(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)

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