projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 0261d33f | 1 | /* Thread package specific definitions of stream lock type. NPTL version. |
| 581c785b | 2 | Copyright (C) 2000-2022 Free Software Foundation, Inc. |
| d7913e0e UD |
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 | |
| 59ba27a6 | 16 | License along with the GNU C Library; if not, see |
| 5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
| d7913e0e | 18 | |
| 81503d1e JM |
19 | #ifndef _STDIO_LOCK_H |
| 20 | #define _STDIO_LOCK_H 1 | |
| d7913e0e | 21 | |
| ec999b8e | 22 | #include <libc-lock.h> |
| d7913e0e UD |
23 | #include <lowlevellock.h> |
| 24 | ||
| 25 | ||
| 26 | typedef struct { int lock; int cnt; void *owner; } _IO_lock_t; | |
| 17119915 | 27 | #define _IO_lock_t_defined 1 |
| d7913e0e | 28 | |
| c28422b5 | 29 | #define _IO_lock_initializer { LLL_LOCK_INITIALIZER, 0, NULL } |
| d7913e0e UD |
30 | |
| 31 | #define _IO_lock_init(_name) \ | |
| ab49e763 | 32 | ((void) ((_name) = (_IO_lock_t) _IO_lock_initializer)) |
| d7913e0e UD |
33 | |
| 34 | #define _IO_lock_fini(_name) \ | |
| 35 | ((void) 0) | |
| 36 | ||
| 37 | #define _IO_lock_lock(_name) \ | |
| 38 | do { \ | |
| 39 | void *__self = THREAD_SELF; \ | |
| 40 | if ((_name).owner != __self) \ | |
| 41 | { \ | |
| e51deae7 | 42 | lll_lock ((_name).lock, LLL_PRIVATE); \ |
| d7913e0e UD |
43 | (_name).owner = __self; \ |
| 44 | } \ | |
| 45 | ++(_name).cnt; \ | |
| 46 | } while (0) | |
| 47 | ||
| 48 | #define _IO_lock_trylock(_name) \ | |
| 49 | ({ \ | |
| 50 | int __result = 0; \ | |
| 51 | void *__self = THREAD_SELF; \ | |
| 52 | if ((_name).owner != __self) \ | |
| 53 | { \ | |
| c28422b5 | 54 | if (lll_trylock ((_name).lock) == 0) \ |
| d7913e0e UD |
55 | { \ |
| 56 | (_name).owner = __self; \ | |
| 57 | (_name).cnt = 1; \ | |
| 58 | } \ | |
| 59 | else \ | |
| 60 | __result = EBUSY; \ | |
| 61 | } \ | |
| 62 | else \ | |
| 63 | ++(_name).cnt; \ | |
| 64 | __result; \ | |
| 65 | }) | |
| 66 | ||
| 67 | #define _IO_lock_unlock(_name) \ | |
| 68 | do { \ | |
| 69 | if (--(_name).cnt == 0) \ | |
| 70 | { \ | |
| 71 | (_name).owner = NULL; \ | |
| e51deae7 | 72 | lll_unlock ((_name).lock, LLL_PRIVATE); \ |
| d7913e0e UD |
73 | } \ |
| 74 | } while (0) | |
| 75 | ||
| 76 | ||
| 77 | ||
| 78 | #define _IO_cleanup_region_start(_fct, _fp) \ | |
| 79 | __libc_cleanup_region_start (((_fp)->_flags & _IO_USER_LOCK) == 0, _fct, _fp) | |
| 80 | #define _IO_cleanup_region_start_noarg(_fct) \ | |
| 81 | __libc_cleanup_region_start (1, _fct, NULL) | |
| 82 | #define _IO_cleanup_region_end(_doit) \ | |
| 83 | __libc_cleanup_region_end (_doit) | |
| 84 | ||
| 4f41c682 | 85 | #if defined _LIBC && IS_IN (libc) |
| 0261d33f UD |
86 | |
| 87 | # ifdef __EXCEPTIONS | |
| 88 | # define _IO_acquire_lock(_fp) \ | |
| 89 | do { \ | |
| 9964a145 | 90 | FILE *_IO_acquire_lock_file \ |
| 38226fe3 UD |
91 | __attribute__((cleanup (_IO_acquire_lock_fct))) \ |
| 92 | = (_fp); \ | |
| 93 | _IO_flockfile (_IO_acquire_lock_file); | |
| 0261d33f UD |
94 | # else |
| 95 | # define _IO_acquire_lock(_fp) _IO_acquire_lock_needs_exceptions_enabled | |
| 96 | # endif | |
| 97 | # define _IO_release_lock(_fp) ; } while (0) | |
| 98 | ||
| 99 | #endif | |
| d7913e0e | 100 | |
| 81503d1e | 101 | #endif /* stdio-lock.h */ |