linuxthreads/lockfile.c

   1 /* lockfile - Handle locking and unlocking of stream.
   2    Copyright (C) 1996, 1998 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 Library General Public License as
   7    published by the Free Software Foundation; either version 2 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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library 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
  24 #ifdef USE_IN_LIBIO
  25 #include "../libio/libioP.h"
  26 #endif
  27
  28 void
  29 __flockfile (FILE *stream)
  30 {
  31 #ifdef USE_IN_LIBIO
  32   __pthread_mutex_lock (stream->_lock);
  33 #else
  34 #endif
  35 }
  36 #ifdef USE_IN_LIBIO
  37 #undef _IO_flockfile
  38 strong_alias (__flockfile, _IO_flockfile)
  39 #endif
  40 weak_alias (__flockfile, flockfile);
  41
  42
  43 void
  44 __funlockfile (FILE *stream)
  45 {
  46 #ifdef USE_IN_LIBIO
  47   __pthread_mutex_unlock (stream->_lock);
  48 #else
  49 #endif
  50 }
  51 #ifdef USE_IN_LIBIO
  52 #undef _IO_funlockfile
  53 strong_alias (__funlockfile, _IO_funlockfile)
  54 #endif
  55 weak_alias (__funlockfile, funlockfile);
  56
  57
  58 int
  59 __ftrylockfile (FILE *stream)
  60 {
  61 #ifdef USE_IN_LIBIO
  62   return __pthread_mutex_trylock (stream->_lock);
  63 #else
  64 #endif
  65 }
  66 #ifdef USE_IN_LIBIO
  67 strong_alias (__ftrylockfile, _IO_ftrylockfile)
  68 #endif
  69 weak_alias (__ftrylockfile, ftrylockfile);
  70
  71
  72 void
  73 __fresetlockfiles (void)
  74 {
  75 #ifdef USE_IN_LIBIO
  76   _IO_FILE *fp;
  77   pthread_mutexattr_t attr;
  78
  79   __pthread_mutexattr_init (&attr);
  80   __pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE_NP);
  81
  82   for (fp = _IO_list_all; fp != NULL; fp = fp->_chain)
  83     __pthread_mutex_init (fp->_lock, &attr);
  84
  85   __pthread_mutexattr_destroy (&attr);
  86 #endif
  87 }