2008-10-25 03:29:28 +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 notice identical to this one.
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.TH PTHREAD_ATTR_SETSTACK 3 2008-10-24 "Linux" "Linux Programmer's Manual"
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.SH NAME
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pthread_attr_setstack, pthread_attr_getstack \- set/get stack
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attributes 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_setstack(pthread_attr_t *" attr ,
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.BI " void *" stackaddr ", size_t " stacksize );
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.BI "int pthread_attr_getstack(pthread_attr_t *" attr ,
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.BI " void **" stackaddr ", size_t *" stacksize );
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.sp
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Compile and link with \fI\-pthread\fP.
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.fi
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.sp
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.in -4n
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.in
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.sp
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.ad l
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.BR pthread_attr_getstack (),
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.BR pthread_attr_setstack ():
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2010-09-19 05:39:11 +00:00
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.RS 4
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2008-10-25 03:29:28 +00:00
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_POSIX_C_SOURCE\ >=\ 200112L || _XOPEN_SOURCE\ >=\ 600
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2010-09-19 05:39:11 +00:00
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.RE
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2008-10-25 03:29:28 +00:00
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.ad b
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.SH DESCRIPTION
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The
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2008-10-27 15:47:57 +00:00
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.BR pthread_attr_setstack ()
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2008-10-25 03:30:53 +00:00
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function sets the stack address and stack size attributes of the
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2008-10-25 03:29:28 +00:00
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thread attributes object referred to by
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.I attr
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to the values specified in
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.IR stackaddr
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and
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.IR stacksize ,
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respectively.
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These attributes specify the location and size of the stack that should
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be used by a thread that is created using the thread attributes object
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.IR attr .
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.I stackaddr
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should point to the lowest addressable byte of a buffer of
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.I stacksize
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bytes that was allocated by the caller.
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The pages of the allocated buffer should be both readable and writable.
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The
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.BR pthread_attr_getstack ()
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function returns the stack address and stack size attributes of the
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thread attributes object referred to by
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.I attr
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in the buffers pointed to by
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.IR stackaddr
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and
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.IR stacksize ,
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respectively.
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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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2008-10-25 03:29:28 +00:00
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.SH ERRORS
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2009-09-27 07:26:25 +00:00
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.BR pthread_attr_setstack ()
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2008-10-25 03:29:28 +00:00
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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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2009-09-27 07:26:25 +00:00
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.I stacksize
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2008-10-25 03:29:28 +00:00
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is less than
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.BR PTHREAD_STACK_MIN
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(16384) bytes.
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On some systems, this error may also occur if
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.IR stackaddr
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or
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.IR "stackaddr\ +\ stacksize"
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is not suitably aligned.
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.PP
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POSIX.1-2001 also documents an
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.BR EACCES
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error if the stack area described by
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.I stackaddr
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and
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.I stacksize
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is not both readable and writable by the caller.
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.SH VERSIONS
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These functions are provided by glibc since version 2.2.
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.SH CONFORMING TO
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POSIX.1-2001.
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.SH NOTES
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These functions are provided for applications that must ensure that
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a thread's stack is placed in a particular location.
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For most applications, this is not necessary,
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and the use of these functions should be avoided.
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(Use
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.BR pthread_attr_setstacksize (3)
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if an application simply requires a stack size other than the default.)
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When an application employs
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.BR pthread_attr_setstack (),
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it takes over the responsibility of allocating the stack.
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Any guard size value that was set using
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.BR pthread_attr_setguardsize (3)
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is ignored.
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If deemed necessary,
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it is the application's responsibility to allocate a guard area
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(one or more pages protected against reading and writing)
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to handle the possibility of stack overflow.
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The address specified in
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.I stackaddr
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should be suitably aligned:
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for full portability, align it on a page boundary
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.RI ( sysconf(_SC_PAGESIZE) ).
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.BR posix_memalign (3)
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may be useful for allocation.
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Probably,
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.IR stacksize
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should also be a multiple of the system page size.
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If
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.I attr
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is used to create multiple threads, then the caller must change the
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stack address attribute between calls to
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.BR pthread_create (3);
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otherwise, the threads will attempt to use the same memory area
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for their stacks, and chaos will ensue.
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.BR
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.SH EXAMPLE
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See
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.BR pthread_attr_init (3).
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.SH SEE ALSO
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.BR mmap (2),
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.BR mprotect (2),
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.BR posix_memalign (3),
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.BR pthread_attr_init (3),
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.BR pthread_attr_setguardsize (3),
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.BR pthread_attr_setstackaddr (3),
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.BR pthread_attr_setstacksize (3),
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.BR pthread_create (3),
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.BR pthreads (7)
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