projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 7df8af43 | 1 | /* Default read-write lock implementation struct definitions. |
| 2b778ceb | 2 | Copyright (C) 2019-2021 Free Software Foundation, Inc. |
| 7df8af43 AZ |
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 __RWLOCK_INTERNAL_H | |
| 20 | #define __RWLOCK_INTERNAL_H | |
| 21 | ||
| 22 | #include <bits/endian.h> | |
| 23 | ||
| 24 | /* Generic struct for both POSIX read-write lock. New ports are expected | |
| 25 | to use the default layout, however archictetures can redefine it to add | |
| 26 | arch-specific extensions (such as lock-elision). The struct have a size | |
| 27 | of 32 bytes on both LP32 and LP64 architectures. */ | |
| 28 | ||
| 29 | struct __pthread_rwlock_arch_t | |
| 30 | { | |
| 31 | unsigned int __readers; | |
| 32 | unsigned int __writers; | |
| 33 | unsigned int __wrphase_futex; | |
| 34 | unsigned int __writers_futex; | |
| 35 | unsigned int __pad3; | |
| 36 | unsigned int __pad4; | |
| 37 | /* FLAGS must stay at its position in the structure to maintain | |
| 38 | binary compatibility. */ | |
| 39 | #if __BYTE_ORDER == __BIG_ENDIAN | |
| 40 | unsigned char __pad1; | |
| 41 | unsigned char __pad2; | |
| 42 | unsigned char __shared; | |
| 43 | unsigned char __flags; | |
| 44 | #else | |
| 45 | unsigned char __flags; | |
| 46 | unsigned char __shared; | |
| 47 | unsigned char __pad1; | |
| 48 | unsigned char __pad2; | |
| 49 | #endif | |
| 50 | int __cur_writer; | |
| 51 | }; | |
| 52 | ||
| 53 | #if __BYTE_ORDER == __BIG_ENDIAN | |
| 54 | # define __PTHREAD_RWLOCK_INITIALIZER(__flags) \ | |
| 55 | 0, 0, 0, 0, 0, 0, 0, 0, 0, __flags, 0 | |
| 56 | #else | |
| 57 | # define __PTHREAD_RWLOCK_INITIALIZER(__flags) \ | |
| 58 | 0, 0, 0, 0, 0, 0, __flags, 0, 0, 0, 0 | |
| 59 | #endif | |
| 60 | ||
| 61 | #endif |