2008-11-10 17:17:19 +00:00
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.\" Copyright (c) 2008 Linux Foundation, written by Michael Kerrisk
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.\" <mtk.manpages@gmail.com>
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.TH PTHREAD_ATTR_SETINHERITSCHED 3 2008-11-10 "Linux" "Linux Programmer's Manual"
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.SH NAME
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pthread_attr_setinheritsched, pthread_attr_getinheritsched \- set/get
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inherit scheduler attribute in thread attributes object
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.SH SYNOPSIS
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.nf
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.B #include <pthread.h>
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.BI "int pthread_attr_setinheritsched(pthread_attr_t *" attr ,
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.BI " int " inheritsched );
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.BI "int pthread_attr_getinheritsched(pthread_attr_t *" attr ,
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.BI " int *" inheritsched );
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.sp
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Compile and link with \fI\-pthread\fP.
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.SH DESCRIPTION
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The
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.BR pthread_attr_setinheritsched ()
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function sets the inherit scheduler attribute of the
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thread attributes object referred to by
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2008-11-18 02:13:23 +00:00
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.IR attr
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2008-11-10 17:17:19 +00:00
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to the value specified in
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.IR inheritsched .
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The inherit scheduler attribute determines whether a thread created using
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the thread attributes object
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.I attr
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will inherit its scheduling attributes from the calling thread
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or whether it will take them from
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.IR attr .
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The following values may be specified in
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.IR inheritsched :
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.TP
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.B PTHREAD_INHERIT_SCHED
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Threads that are created using
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.I attr
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inherit scheduling attributes from the creating thread;
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the scheduling attributes in
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.I attr
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are ignored.
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.TP
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.B PTHREAD_EXPLICIT_SCHED
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Threads that are created using
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.I attr
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take their scheduling attributes from the values specified
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by the attributes object.
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.\" FIXME what are the defaults for scheduler settings?
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.PP
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The default setting of the inherit scheduler attribute in
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a newly initialized thread attributes object is
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.BR PTHREAD_INHERIT_SCHED .
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The
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.BR pthread_attr_getinheritsched ()
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returns the inherit scheduler attribute of the thread attributes object
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.IR attr
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in the buffer pointed to by
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.IR inheritsched .
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.SH RETURN VALUE
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On success, these functions return 0;
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intro.1, time.1, adjtimex.2, capget.2, eventfd.2, fcntl.2, getrlimit.2, getsockopt.2, gettimeofday.2, intro.2, ioctl_list.2, ioperm.2, mlock.2, pivot_root.2, poll.2, prctl.2, ptrace.2, sched_setscheduler.2, select_tut.2, semget.2, sigaltstack.2, signalfd.2, sysctl.2, timer_settime.2, timerfd_create.2, wait.2, CPU_SET.3, argz_add.3, assert_perror.3, atexit.3, backtrace.3, bcmp.3, clearenv.3, ctime.3, dl_iterate_phdr.3, dlopen.3, ecvt.3, errno.3, error.3, ether_aton.3, exit.3, fenv.3, ferror.3, finite.3, flockfile.3, fnmatch.3, fpathconf.3, fpclassify.3, ftime.3, ftok.3, ftw.3, fwide.3, getaddrinfo.3, gethostbyname.3, getlogin.3, getnameinfo.3, getnetent.3, getopt.3, getprotoent.3, getrpcent.3, getservent.3, glob.3, hsearch.3, inet.3, isalpha.3, iswalnum.3, iswalpha.3, iswblank.3, iswcntrl.3, iswctype.3, iswdigit.3, iswgraph.3, iswlower.3, iswprint.3, iswpunct.3, iswspace.3, iswupper.3, iswxdigit.3, longjmp.3, lsearch.3, malloc.3, matherr.3, mblen.3, mbsinit.3, mbtowc.3, on_exit.3, printf.3, pthread_attr_init.3, pthread_attr_setaffinity_np.3, pthread_attr_setdetachstate.3, pthread_attr_setguardsize.3, pthread_attr_setinheritsched.3, pthread_attr_setschedparam.3, pthread_attr_setschedpolicy.3, pthread_attr_setscope.3, pthread_attr_setstack.3, pthread_attr_setstackaddr.3, pthread_attr_setstacksize.3, pthread_cancel.3, pthread_cleanup_push.3, pthread_equal.3, pthread_getattr_np.3, pthread_getcpuclockid.3, pthread_setaffinity_np.3, pthread_setcancelstate.3, pthread_setconcurrency.3, pthread_setschedparam.3, pthread_setschedprio.3, ptsname.3, putenv.3, putgrent.3, raise.3, rcmd.3, regex.3, rexec.3, rpc.3, rpmatch.3, rtnetlink.3, scandir.3, sem_init.3, setaliasent.3, setbuf.3, setenv.3, setjmp.3, signbit.3, stdio_ext.3, strtod.3, strtol.3, strtoul.3, system.3, termios.3, timeradd.3, tzset.3, ualarm.3, wctomb.3, xdr.3, st.4, tty_ioctl.4, core.5, elf.5, proc.5, bootparam.7, capabilities.7, icmp.7, ip.7, ipv6.7, math_error.7, mdoc.samples.7, mq_overview.7, pthreads.7, raw.7, regex.7, socket.7, tcp.7, tzselect.8: Global fix: s/non-zero/nonzero/
The tendency in English, as prescribed in style guides like
Chicago MoS, is towards removing hyphens after prefixes
like "non-" etc.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2010-01-16 16:40:55 +00:00
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on error, they return a nonzero error number.
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2008-11-10 17:17:19 +00:00
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.SH ERRORS
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.BR pthread_attr_setinheritsched ()
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can fail with the following error:
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.TP
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.B EINVAL
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Invalid value in
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.IR inheritsched .
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.PP
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POSIX.1-2001 also documents an optional
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.B ENOTSUP
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error ("attempt was made to set the attribute to an unsupported value") for
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.BR pthread_attr_setinheritsched ().
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.\" .SH VERSIONS
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.\" Available since glibc 2.0.
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.SH CONFORMING TO
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POSIX.1-2001.
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.SH EXAMPLE
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See
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.BR pthread_setschedparam (3).
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.SH BUGS
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As at glibc 2.8, if a thread attributes object is initialized using
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.BR pthread_attr_init (3),
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then the scheduling policy of the attributes object is set to
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.BR SCHED_OTHER
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and the scheduling priority is set to 0.
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However, if the inherit scheduler attribute is then set to
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.BR PTHREAD_EXPLICIT_SCHED ,
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then a thread created using the attribute object
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wrongly inherits its scheduling attributes from the creating thread.
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This bug does not occur if either the scheduling policy or
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scheduling priority attribute is explicitly set
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in the thread attributes object before calling
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.BR pthread_create (3).
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.\" FIXME . Track status of the following bug:
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.\" http://sourceware.org/bugzilla/show_bug.cgi?id=7007
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.SH SEE ALSO
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.BR sched_setscheduler (2),
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.BR pthread_attr_init (3),
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.BR pthread_attr_setschedparam (3),
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.BR pthread_attr_setschedpolicy (3),
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.BR pthread_create (3),
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.BR pthread_setschedparam (3),
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.BR pthread_setschedprio (3),
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.BR pthreads (7)
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