PTHREAD_ATTR_SETINHERITSCHED(3)                     Linux Programmer's Manual                    PTHREAD_ATTR_SETINHERITSCHED(3)



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

SYNOPSIS
       #include <pthread.h>

       int pthread_attr_setinheritsched(pthread_attr_t *attr,
                                        int inheritsched);
       int pthread_attr_getinheritsched(pthread_attr_t *attr,
                                        int *inheritsched);

       Compile and link with -pthread.

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 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.1-2001  also  documents an optional ENOTSUP error ("attempt was made to set the attribute to an unsupported value")
       for pthread_attr_setinheritsched().

CONFORMING TO
       POSIX.1-2001.

EXAMPLE
       See pthread_setschedparam(3).

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).

SEE ALSO
       sched_setscheduler(2), pthread_attr_init(3), pthread_attr_setschedparam(3), pthread_attr_setschedpolicy(3),  pthread_cre-
       ate(3), pthread_setschedparam(3), pthread_setschedprio(3), pthreads(7)

COLOPHON
       This  page  is  part of release 3.25 of the Linux man-pages project.  A description of the project, and information about
       reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                                                      2008-11-10                            PTHREAD_ATTR_SETINHERITSCHED(3)