htl/lockfile.c

   1 /* lockfile - Handle locking and unlocking of streams.  Hurd pthread version.
   2    Copyright (C) 2000-2020 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
   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, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <cthreads.h>
  20 #include <pthread.h>            /* Must come before <stdio.h>! */
  21 #include <stdio.h>
  22
  23 void
  24 _cthreads_flockfile (FILE *fp)
  25 {
  26   _IO_lock_lock (*fp->_lock);
  27 }
  28
  29 void
  30 _cthreads_funlockfile (FILE *fp)
  31 {
  32   _IO_lock_unlock (*fp->_lock);
  33 }
  34
  35 int
  36 _cthreads_ftrylockfile (FILE *fp)
  37 {
  38   return __libc_lock_trylock_recursive (*fp->_lock);
  39 }
  40
  41 #undef  _IO_flockfile
  42 #undef  _IO_funlockfile
  43 #undef  _IO_ftrylockfile
  44 #undef  flockfile
  45 #undef  funlockfile
  46 #undef  ftrylockfile
  47
  48 void _IO_flockfile (FILE *)
  49      __attribute__ ((alias ("_cthreads_flockfile")));
  50 void _IO_funlockfile (FILE *)
  51      __attribute__ ((alias ("_cthreads_funlockfile")));
  52 int _IO_ftrylockfile (FILE *)
  53      __attribute__ ((alias ("_cthreads_ftrylockfile")));
  54
  55 void flockfile (FILE *)
  56      __attribute__ ((weak, alias ("_cthreads_flockfile")));
  57 void funlockfile (FILE *)
  58      __attribute__ ((weak, alias ("_cthreads_funlockfile")));
  59 int ftrylockfile (FILE *)
  60      __attribute__ ((weak, alias ("_cthreads_ftrylockfile")));