1/* x86 internal rwlock struct definitions. 
2 Copyright (C) 2019-2020 Free Software Foundation, Inc. 
3 
4 This file is part of the GNU C Library. 
5 
6 The GNU C Library is free software; you can redistribute it and/or 
7 modify it under the terms of the GNU Lesser General Public 
8 License as published by the Free Software Foundation; either 
9 version 2.1 of the License, or (at your option) any later version. 
10 
11 The GNU C Library is distributed in the hope that it will be useful, 
12 but WITHOUT ANY WARRANTY; without even the implied warranty of 
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
14 Lesser General Public License for more details. 
15 
16 You should have received a copy of the GNU Lesser General Public 
17 License along with the GNU C Library; if not, see 
18 <http://www.gnu.org/licenses/>. */ 
19 
20#ifndef _RWLOCK_INTERNAL_H 
21#define _RWLOCK_INTERNAL_H 
22 
23struct __pthread_rwlock_arch_t 
24{ 
25 unsigned int __readers; 
26 unsigned int __writers; 
27 unsigned int __wrphase_futex; 
28 unsigned int __writers_futex; 
29 unsigned int __pad3; 
30 unsigned int __pad4; 
31#ifdef __x86_64__ 
32 int __cur_writer; 
33 int __shared; 
34 signed char __rwelision; 
35# ifdef __ILP32__ 
36 unsigned char __pad1[3]; 
37# define __PTHREAD_RWLOCK_ELISION_EXTRA 0, { 0, 0, 0 } 
38# else 
39 unsigned char __pad1[7]; 
40# define __PTHREAD_RWLOCK_ELISION_EXTRA 0, { 0, 0, 0, 0, 0, 0, 0 } 
41# endif 
42 unsigned long int __pad2; 
43 /* FLAGS must stay at this position in the structure to maintain 
44 binary compatibility. */ 
45 unsigned int __flags; 
46#else /* __x86_64__ */ 
47 /* FLAGS must stay at this position in the structure to maintain 
48 binary compatibility. */ 
49 unsigned char __flags; 
50 unsigned char __shared; 
51 signed char __rwelision; 
52 unsigned char __pad2; 
53 int __cur_writer; 
54#endif 
55}; 
56 
57#ifdef __x86_64__ 
58# define __PTHREAD_RWLOCK_INITIALIZER(__flags) \ 
59 0, 0, 0, 0, 0, 0, 0, 0, __PTHREAD_RWLOCK_ELISION_EXTRA, 0, __flags 
60#else 
61# define __PTHREAD_RWLOCK_INITIALIZER(__flags) \ 
62 0, 0, 0, 0, 0, 0, __flags, 0, 0, 0, 0 
63#endif 
64 
65#endif 
66