htl/lockfile.c

   1 /* lockfile - Handle locking and unlocking of streams.  Hurd pthread version.
   2    Copyright (C) 2000-2021 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 <pthread.h>            /* Must come before <stdio.h>! */
  20 #include <stdio.h>
  21
  22 void
  23 _cthreads_flockfile (FILE *fp)
  24 {
  25   _IO_lock_lock (*fp->_lock);
  26 }
  27
  28 void
  29 _cthreads_funlockfile (FILE *fp)
  30 {
  31   _IO_lock_unlock (*fp->_lock);
  32 }
  33
  34 int
  35 _cthreads_ftrylockfile (FILE *fp)
  36 {
  37   return __libc_lock_trylock_recursive (*fp->_lock);
  38 }
  39
  40 #undef  _IO_flockfile
  41 #undef  _IO_funlockfile
  42 #undef  _IO_ftrylockfile
  43 #undef  flockfile
  44 #undef  funlockfile
  45 #undef  ftrylockfile
  46
  47 void _IO_flockfile (FILE *)
  48      __attribute__ ((alias ("_cthreads_flockfile")));
  49 void _IO_funlockfile (FILE *)
  50      __attribute__ ((alias ("_cthreads_funlockfile")));
  51 int _IO_ftrylockfile (FILE *)
  52      __attribute__ ((alias ("_cthreads_ftrylockfile")));
  53
  54 void flockfile (FILE *)
  55      __attribute__ ((weak, alias ("_cthreads_flockfile")));
  56 void funlockfile (FILE *)
  57      __attribute__ ((weak, alias ("_cthreads_funlockfile")));
  58 int ftrylockfile (FILE *)
  59      __attribute__ ((weak, alias ("_cthreads_ftrylockfile")));