1 /* Thread package specific definitions of stream lock type. NPTL version. 2 Copyright (C) 2000, 2001, 2002, 2003, 2007 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, write to the Free 17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 18 02111-1307 USA. */ 19 20 #ifndef _BITS_STDIO_LOCK_H 21 #define _BITS_STDIO_LOCK_H 1 22 23 #include <bits/libc-lock.h> 24 #include <lowlevellock.h> 25 26 27 /* The locking here is very inexpensive, even for inlining. */ 28 #define _IO_lock_inexpensive 1 29 30 typedef struct { int lock; int cnt; void *owner; } _IO_lock_t; 31 32 #define _IO_lock_initializer { LLL_LOCK_INITIALIZER, 0, NULL } 33 34 #define _IO_lock_init(_name) \ 35 ((_name) = (_IO_lock_t) _IO_lock_initializer , 0) 36 37 #define _IO_lock_fini(_name) \ 38 ((void) 0) 39 40 #define _IO_lock_lock(_name) \ 41 do { \ 42 void *__self = THREAD_SELF; \ 43 if ((_name).owner != __self) \ 44 { \ 45 lll_lock ((_name).lock, LLL_PRIVATE); \ 46 (_name).owner = __self; \ 47 } \ 48 ++(_name).cnt; \ 49 } while (0) 50 51 #define _IO_lock_trylock(_name) \ 52 ({ \ 53 int __result = 0; \ 54 void *__self = THREAD_SELF; \ 55 if ((_name).owner != __self) \ 56 { \ 57 if (lll_trylock ((_name).lock) == 0) \ 58 { \ 59 (_name).owner = __self; \ 60 (_name).cnt = 1; \ 61 } \ 62 else \ 63 __result = EBUSY; \ 64 } \ 65 else \ 66 ++(_name).cnt; \ 67 __result; \ 68 }) 69 70 #define _IO_lock_unlock(_name) \ 71 do { \ 72 if (--(_name).cnt == 0) \ 73 { \ 74 (_name).owner = NULL; \ 75 lll_unlock ((_name).lock, LLL_PRIVATE); \ 76 } \ 77 } while (0) 78 79 80 81 #define _IO_cleanup_region_start(_fct, _fp) \ 82 __libc_cleanup_region_start (((_fp)->_flags & _IO_USER_LOCK) == 0, _fct, _fp) 83 #define _IO_cleanup_region_start_noarg(_fct) \ 84 __libc_cleanup_region_start (1, _fct, NULL) 85 #define _IO_cleanup_region_end(_doit) \ 86 __libc_cleanup_region_end (_doit) 87 88 #if defined _LIBC && !defined NOT_IN_libc 89 90 # ifdef __EXCEPTIONS 91 # define _IO_acquire_lock(_fp) \ 92 do { \ 93 _IO_FILE *_IO_acquire_lock_file \ 94 __attribute__((cleanup (_IO_acquire_lock_fct))) \ 95 = (_fp); \ 96 _IO_flockfile (_IO_acquire_lock_file); 97 # define _IO_acquire_lock_clear_flags2(_fp) \ 98 do { \ 99 _IO_FILE *_IO_acquire_lock_file \ 100 __attribute__((cleanup (_IO_acquire_lock_clear_flags2_fct))) \ 101 = (_fp); \ 102 _IO_flockfile (_IO_acquire_lock_file); 103 # else 104 # define _IO_acquire_lock(_fp) _IO_acquire_lock_needs_exceptions_enabled 105 # define _IO_acquire_lock_clear_flags2(_fp) _IO_acquire_lock (_fp) 106 # endif 107 # define _IO_release_lock(_fp) ; } while (0) 108 109 #endif 110 111 #endif /* bits/stdio-lock.h */ 112
