sysdeps/generic/stdio-lock.h

   1 /* Thread package specific definitions of stream lock type.  Generic version.
   2    Copyright (C) 2000-2017 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _STDIO_LOCK_H
  20 #define _STDIO_LOCK_H 1
  21
  22 #include <libc-lock.h>
  23
  24 __libc_lock_define_recursive (typedef, _IO_lock_t)
  25 #define _IO_lock_t_defined 1
  26
  27 /* We need recursive (counting) mutexes.  */
  28 #ifdef _LIBC_LOCK_RECURSIVE_INITIALIZER
  29 # define _IO_lock_initializer _LIBC_LOCK_RECURSIVE_INITIALIZER
  30 #elif _IO_MTSAFE_IO
  31  #error libio needs recursive mutexes for _IO_MTSAFE_IO
  32 #endif
  33
  34 #define _IO_lock_init(_name)    __libc_lock_init_recursive (_name)
  35 #define _IO_lock_fini(_name)    __libc_lock_fini_recursive (_name)
  36 #define _IO_lock_lock(_name)    __libc_lock_lock_recursive (_name)
  37 #define _IO_lock_trylock(_name) __libc_lock_trylock_recursive (_name)
  38 #define _IO_lock_unlock(_name)  __libc_lock_unlock_recursive (_name)
  39
  40
  41 #define _IO_cleanup_region_start(_fct, _fp) \
  42   __libc_cleanup_region_start (((_fp)->_flags & _IO_USER_LOCK) == 0, _fct, _fp)
  43 #define _IO_cleanup_region_start_noarg(_fct) \
  44   __libc_cleanup_region_start (1, _fct, NULL)
  45 #define _IO_cleanup_region_end(_doit) \
  46   __libc_cleanup_region_end (_doit)
  47
  48 #if defined _LIBC && IS_IN (libc)
  49
  50 # ifdef __EXCEPTIONS
  51 # define _IO_acquire_lock(_fp) \
  52   do {                                                                        \
  53     _IO_FILE *_IO_acquire_lock_file                                           \
  54         __attribute__((cleanup (_IO_acquire_lock_fct)))                       \
  55         = (_fp);                                                              \
  56     _IO_flockfile (_IO_acquire_lock_file);
  57 #  define _IO_acquire_lock_clear_flags2(_fp) \
  58   do {                                                                        \
  59     _IO_FILE *_IO_acquire_lock_file                                           \
  60         __attribute__((cleanup (_IO_acquire_lock_clear_flags2_fct)))          \
  61         = (_fp);                                                              \
  62     _IO_flockfile (_IO_acquire_lock_file);
  63 # else
  64 #  define _IO_acquire_lock(_fp) _IO_acquire_lock_needs_exceptions_enabled
  65 #  define _IO_acquire_lock_clear_flags2(_fp) _IO_acquire_lock (_fp)
  66 # endif
  67 # define _IO_release_lock(_fp) ; } while (0)
  68
  69 #endif
  70
  71 #endif /* stdio-lock.h */