| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Thread package specific definitions of stream lock type. NPTL 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 | #include <lowlevellock.h> |
| 24 | |
| 25 | |
| 26 | /* The locking here is very inexpensive, even for inlining. */ |
| 27 | #define _IO_lock_inexpensive 1 |
| 28 | |
| 29 | typedef struct { int lock; int cnt; void *owner; } _IO_lock_t; |
| 30 | |
| 31 | #define _IO_lock_initializer { LLL_LOCK_INITIALIZER, 0, NULL } |
| 32 | |
| 33 | #define _IO_lock_init(_name) \ |
| 34 | ((void) ((_name) = (_IO_lock_t) _IO_lock_initializer)) |
| 35 | |
| 36 | #define _IO_lock_fini(_name) \ |
| 37 | ((void) 0) |
| 38 | |
| 39 | #define _IO_lock_lock(_name) \ |
| 40 | do { \ |
| 41 | void *__self = THREAD_SELF; \ |
| 42 | if ((_name).owner != __self) \ |
| 43 | { \ |
| 44 | lll_lock ((_name).lock, LLL_PRIVATE); \ |
| 45 | (_name).owner = __self; \ |
| 46 | } \ |
| 47 | ++(_name).cnt; \ |
| 48 | } while (0) |
| 49 | |
| 50 | #define _IO_lock_trylock(_name) \ |
| 51 | ({ \ |
| 52 | int __result = 0; \ |
| 53 | void *__self = THREAD_SELF; \ |
| 54 | if ((_name).owner != __self) \ |
| 55 | { \ |
| 56 | if (lll_trylock ((_name).lock) == 0) \ |
| 57 | { \ |
| 58 | (_name).owner = __self; \ |
| 59 | (_name).cnt = 1; \ |
| 60 | } \ |
| 61 | else \ |
| 62 | __result = EBUSY; \ |
| 63 | } \ |
| 64 | else \ |
| 65 | ++(_name).cnt; \ |
| 66 | __result; \ |
| 67 | }) |
| 68 | |
| 69 | #define _IO_lock_unlock(_name) \ |
| 70 | do { \ |
| 71 | if (--(_name).cnt == 0) \ |
| 72 | { \ |
| 73 | (_name).owner = NULL; \ |
| 74 | lll_unlock ((_name).lock, LLL_PRIVATE); \ |
| 75 | } \ |
| 76 | } while (0) |
| 77 | |
| 78 | |
| 79 | |
| 80 | #define _IO_cleanup_region_start(_fct, _fp) \ |
| 81 | __libc_cleanup_region_start (((_fp)->_flags & _IO_USER_LOCK) == 0, _fct, _fp) |
| 82 | #define _IO_cleanup_region_start_noarg(_fct) \ |
| 83 | __libc_cleanup_region_start (1, _fct, NULL) |
| 84 | #define _IO_cleanup_region_end(_doit) \ |
| 85 | __libc_cleanup_region_end (_doit) |
| 86 | |
| 87 | #if defined _LIBC && IS_IN (libc) |
| 88 | |
| 89 | # ifdef __EXCEPTIONS |
| 90 | # define _IO_acquire_lock(_fp) \ |
| 91 | do { \ |
| 92 | _IO_FILE *_IO_acquire_lock_file \ |
| 93 | __attribute__((cleanup (_IO_acquire_lock_fct))) \ |
| 94 | = (_fp); \ |
| 95 | _IO_flockfile (_IO_acquire_lock_file); |
| 96 | # define _IO_acquire_lock_clear_flags2(_fp) \ |
| 97 | do { \ |
| 98 | _IO_FILE *_IO_acquire_lock_file \ |
| 99 | __attribute__((cleanup (_IO_acquire_lock_clear_flags2_fct))) \ |
| 100 | = (_fp); \ |
| 101 | _IO_flockfile (_IO_acquire_lock_file); |
| 102 | # else |
| 103 | # define _IO_acquire_lock(_fp) _IO_acquire_lock_needs_exceptions_enabled |
| 104 | # define _IO_acquire_lock_clear_flags2(_fp) _IO_acquire_lock (_fp) |
| 105 | # endif |
| 106 | # define _IO_release_lock(_fp) ; } while (0) |
| 107 | |
| 108 | #endif |
| 109 | |
| 110 | #endif /* stdio-lock.h */ |