1 /* x86 internal rwlock struct definitions. 2 Copyright (C) 2019-2021 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 23 struct __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