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 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 #include "internals.h"
  24
  25 #ifdef USE_IN_LIBIO
  26 #include "../libio/libioP.h"
  27 #endif
  28
  29 void
  30 __flockfile (FILE *stream)
  31 {
  32 #ifdef USE_IN_LIBIO
  33   __pthread_mutex_lock (stream->_lock);
  34 #else
  35 #endif
  36 }
  37 #ifdef USE_IN_LIBIO
  38 #undef _IO_flockfile
  39 strong_alias (__flockfile, _IO_flockfile)
  40 #endif
  41 weak_alias (__flockfile, flockfile);
  42
  43
  44 void
  45 __funlockfile (FILE *stream)
  46 {
  47 #ifdef USE_IN_LIBIO
  48   __pthread_mutex_unlock (stream->_lock);
  49 #else
  50 #endif
  51 }
  52 #ifdef USE_IN_LIBIO
  53 #undef _IO_funlockfile
  54 strong_alias (__funlockfile, _IO_funlockfile)
  55 #endif
  56 weak_alias (__funlockfile, funlockfile);
  57
  58
  59 int
  60 __ftrylockfile (FILE *stream)
  61 {
  62 #ifdef USE_IN_LIBIO
  63   return __pthread_mutex_trylock (stream->_lock);
  64 #else
  65 #endif
  66 }
  67 #ifdef USE_IN_LIBIO
  68 strong_alias (__ftrylockfile, _IO_ftrylockfile)
  69 #endif
  70 weak_alias (__ftrylockfile, ftrylockfile);
  71
  72 void
  73 __flockfilelist(void)
  74 {
  75 #ifdef USE_IN_LIBIO
  76   _IO_list_lock();
  77 #endif
  78 }
  79
  80 void
  81 __funlockfilelist(void)
  82 {
  83 #ifdef USE_IN_LIBIO
  84   _IO_list_unlock();
  85 #endif
  86 }
  87
  88 void
  89 __fresetlockfiles (void)
  90 {
  91 #ifdef USE_IN_LIBIO
  92   _IO_ITER i;
  93
  94   pthread_mutexattr_t attr;
  95
  96   __pthread_mutexattr_init (&attr);
  97   __pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE_NP);
  98
  99   for (i = _IO_iter_begin(); i != _IO_iter_end(); i = _IO_iter_next(i))
 100     __pthread_mutex_init (_IO_iter_file(i)->_lock, &attr);
 101
 102   __pthread_mutexattr_destroy (&attr);
 103
 104   _IO_list_resetlock();
 105 #endif
 106 }