nptl/sysdeps/unix/sysv/linux/msync.c

   1 /* Copyright (C) 2002 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <stdlib.h>
  22 #include <sysdep.h>
  23 #include <sys/mman.h>
  24 #include <nptl/pthreadP.h>
  25 #include <tls.h>
  26
  27
  28 int
  29 __libc_msync (void *start, size_t length, int flags)
  30 {
  31 #ifndef NOT_IN_libc
  32   if (__builtin_expect (THREAD_GETMEM (THREAD_SELF,
  33                                        header.data.multiple_threads) == 0, 1))
  34     return INLINE_SYSCALL (msync, 3, start, length, flags);
  35
  36   int oldtype = LIBC_CANCEL_ASYNC ();
  37 #endif
  38
  39   int result = INLINE_SYSCALL (msync, 3, start, length, flags);
  40
  41 #ifndef NOT_IN_libc
  42   LIBC_CANCEL_RESET (oldtype);
  43 #endif
  44
  45   return result;
  46 }
  47 weak_alias (__libc_msync, msync)