[Bug nptl/7013] New: Policies permitted by pthread_attr_setschedpolicy() inconsistent with pthread_setschedparam()

["mtk dot manpages at gmail dot com" <sourceware-bugzilla@sourceware.org>]

In nptl/pthread_attr_setschedpolicy.c there are the lines

  /* Catch invalid values.  */
  if (policy != SCHED_OTHER && policy != SCHED_FIFO && policy != SCHED_RR)
    return EINVAL;

In pthread_setschedparam(), there is not an analogous check.

This means that one can set, for example, a SCHED_BATCH policy with 
pthread_setschedparam(), but one can't initialize a thread attributes object
that can be used to create a thread running under the SCHED_BATCH policy.  

This seems rather inconsistent.  Either pthread_setschedparam() should place the
same restriction as pthread_attr_setschedpolicy(), or the restriction should be
removed from pthread_attr_setschedpolicy().  Given that the POSIX.1
specification of pthread_attr_setschedpolicy() says:

    The  supported  values  of  policy  shall  include  SCHED_FIFO,
    SCHED_RR, and SCHED_OTHER, which are defined in  the  <sched.h>
    header.

removing the restriction from pthread_attr_setschedpolicy() seems the more
reasonable course, so that applications can take advantage of the additional
scheduling policies provided by Linux.

-- 
           Summary: Policies permitted by pthread_attr_setschedpolicy()
                    inconsistent with pthread_setschedparam()
           Product: glibc
           Version: 2.8
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nptl
        AssignedTo: drepper at redhat dot com
        ReportedBy: mtk dot manpages at gmail dot com
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=7013

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