linuxthreads/lockfile.c

   1 /* lockfile - Handle locking and unlocking of stream.
   2    Copyright (C) 1996, 1998, 2000 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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 License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    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; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <bits/libc-lock.h>
  21 #include <stdio.h>
  22 #include <pthread.h>
  23 #include "internals.h"
  24 #include "../libio/libioP.h"
  25
  26 void
  27 __flockfile (FILE *stream)
  28 {
  29   __pthread_mutex_lock (stream->_lock);
  30 }
  31 #undef _IO_flockfile
  32 strong_alias (__flockfile, _IO_flockfile)
  33 weak_alias (__flockfile, flockfile);
  34
  35
  36 void
  37 __funlockfile (FILE *stream)
  38 {
  39   __pthread_mutex_unlock (stream->_lock);
  40 }
  41 #undef _IO_funlockfile
  42 strong_alias (__funlockfile, _IO_funlockfile)
  43 weak_alias (__funlockfile, funlockfile);
  44
  45
  46 int
  47 __ftrylockfile (FILE *stream)
  48 {
  49   return __pthread_mutex_trylock (stream->_lock);
  50 }
  51 strong_alias (__ftrylockfile, _IO_ftrylockfile)
  52 weak_alias (__ftrylockfile, ftrylockfile);
  53
  54 void
  55 __flockfilelist(void)
  56 {
  57   _IO_list_lock();
  58 }
  59
  60 void
  61 __funlockfilelist(void)
  62 {
  63   _IO_list_unlock();
  64 }
  65
  66 void
  67 __fresetlockfiles (void)
  68 {
  69   _IO_ITER i;
  70
  71   pthread_mutexattr_t attr;
  72
  73   __pthread_mutexattr_init (&attr);
  74   __pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE_NP);
  75
  76   for (i = _IO_iter_begin(); i != _IO_iter_end(); i = _IO_iter_next(i))
  77     __pthread_mutex_init (_IO_iter_file(i)->_lock, &attr);
  78
  79   __pthread_mutexattr_destroy (&attr);
  80
  81   _IO_list_resetlock();
  82 }