sysdeps/generic/stdio-lock.h

   1 /* Thread package specific definitions of stream lock type.  Generic version.
   2    Copyright (C) 2000-2016 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
  26 /* We need recursive (counting) mutexes.  */
  27 #ifdef _LIBC_LOCK_RECURSIVE_INITIALIZER
  28 # define _IO_lock_initializer _LIBC_LOCK_RECURSIVE_INITIALIZER
  29 #elif _IO_MTSAFE_IO
  30  #error libio needs recursive mutexes for _IO_MTSAFE_IO
  31 #endif
  32
  33 #define _IO_lock_init(_name)    __libc_lock_init_recursive (_name)
  34 #define _IO_lock_fini(_name)    __libc_lock_fini_recursive (_name)
  35 #define _IO_lock_lock(_name)    __libc_lock_lock_recursive (_name)
  36 #define _IO_lock_trylock(_name) __libc_lock_trylock_recursive (_name)
  37 #define _IO_lock_unlock(_name)  __libc_lock_unlock_recursive (_name)
  38
  39
  40 #define _IO_cleanup_region_start(_fct, _fp) \
  41   __libc_cleanup_region_start (((_fp)->_flags & _IO_USER_LOCK) == 0, _fct, _fp)
  42 #define _IO_cleanup_region_start_noarg(_fct) \
  43   __libc_cleanup_region_start (1, _fct, NULL)
  44 #define _IO_cleanup_region_end(_doit) \
  45   __libc_cleanup_region_end (_doit)
  46
  47 #if defined _LIBC && IS_IN (libc)
  48
  49 # ifdef __EXCEPTIONS
  50 # define _IO_acquire_lock(_fp) \
  51   do {                                                                        \
  52     _IO_FILE *_IO_acquire_lock_file                                           \
  53         __attribute__((cleanup (_IO_acquire_lock_fct)))                       \
  54         = (_fp);                                                              \
  55     _IO_flockfile (_IO_acquire_lock_file);
  56 #  define _IO_acquire_lock_clear_flags2(_fp) \
  57   do {                                                                        \
  58     _IO_FILE *_IO_acquire_lock_file                                           \
  59         __attribute__((cleanup (_IO_acquire_lock_clear_flags2_fct)))          \
  60         = (_fp);                                                              \
  61     _IO_flockfile (_IO_acquire_lock_file);
  62 # else
  63 #  define _IO_acquire_lock(_fp) _IO_acquire_lock_needs_exceptions_enabled
  64 #  define _IO_acquire_lock_clear_flags2(_fp) _IO_acquire_lock (_fp)
  65 # endif
  66 # define _IO_release_lock(_fp) ; } while (0)
  67
  68 #endif
  69
  70 #endif /* stdio-lock.h */