sysdeps/mach/hurd/bits/stdio-lock.h

   1 /* Thread package specific definitions of stream lock type.  Hurd version.
   2    Copyright (C) 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 #ifndef _BITS_STDIO_LOCK_H
  21 #define _BITS_STDIO_LOCK_H 1
  22
  23 /* We need recursive (counting) mutexes.  Since cthreads doesn't really
  24    have them, we implement them just for libio.  The implementation is
  25    partially here and partially in Hurd's version of cthreads (i.e. the
  26    libthreads library, libthreads/lockfile.c).  */
  27
  28 #if (_LIBC - 0) || (_CTHREADS_ - 0)
  29 #include <cthreads.h>
  30
  31 struct _IO_cthreads_lock
  32 {
  33   struct mutex mutex;
  34   cthread_t owner;
  35   unsigned int count;
  36 };
  37 #else
  38 struct _IO_cthreads_lock;
  39 #endif
  40 typedef struct _IO_cthreads_lock _IO_lock_t;
  41
  42 #define _IO_lock_initializer    { MUTEX_INITIALIZER, 0, 0 }
  43
  44 #define _IO_lock_init(_name) ({ (_name) = (_IO_lock_t) _IO_lock_initializer; })
  45 #define _IO_lock_fini(_name) ((void) 0) /* nothing to do */
  46
  47 /* These are in fact only used for `list_all_lock' (libio/genops.c),
  48    which does not need a recursive lock.  The per-FILE locks are only
  49    accessed through _IO_flockfile et al, which Hurd's libthreads overrides.  */
  50 #define _IO_lock_lock(_name) __libc_lock_lock ((_name).mutex)
  51 #define _IO_lock_unlock(_name) __libc_lock_unlock ((_name).mutex)
  52
  53 #ifdef _LIBC
  54 #include <bits/libc-lock.h>
  55
  56 #define _IO_cleanup_region_start(_fct, _fp) \
  57      __libc_cleanup_region_start (_fct, _fp)
  58 #define _IO_cleanup_region_end(_doit) \
  59      __libc_cleanup_region_end (_doit)
  60 #endif
  61
  62
  63 #endif /* bits/stdio-lock.h */