1 /* RISC-V internal rwlock struct definitions. 2 Copyright (C) 2019-2022 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 <https://www.gnu.org/licenses/>. */ 19 20 #ifndef _RWLOCK_INTERNAL_H 21 #define _RWLOCK_INTERNAL_H 22 23 /* There is a lot of padding in this structure. While it's not strictly 24 necessary on RISC-V, we're going to leave it in to be on the safe side in 25 case it's needed in the future. Most other architectures have the padding, 26 so this gives us the same extensibility as everyone else has. */ 27 struct __pthread_rwlock_arch_t 28 { 29 unsigned int __readers; 30 unsigned int __writers; 31 unsigned int __wrphase_futex; 32 unsigned int __writers_futex; 33 unsigned int __pad3; 34 unsigned int __pad4; 35 #if __WORDSIZE == 64 36 int __cur_writer; 37 int __shared; 38 unsigned long int __pad1; 39 unsigned long int __pad2; 40 unsigned int __flags; 41 #else 42 # if __BYTE_ORDER == __BIG_ENDIAN 43 unsigned char __pad1; 44 unsigned char __pad2; 45 unsigned char __shared; 46 unsigned char __flags; 47 # else 48 unsigned char __flags; 49 unsigned char __shared; 50 unsigned char __pad1; 51 unsigned char __pad2; 52 # endif 53 int __cur_writer; 54 #endif 55 }; 56 57 #if __WORDSIZE == 64 58 # define __PTHREAD_RWLOCK_INITIALIZER(__flags) \ 59 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, __flags 60 #elif __BYTE_ORDER == __BIG_ENDIAN 61 # define __PTHREAD_RWLOCK_INITIALIZER(__flags) \ 62 0, 0, 0, 0, 0, 0, 0, 0, 0, __flags, 0 63 #else 64 # define __PTHREAD_RWLOCK_INITIALIZER(__flags) \ 65 0, 0, 0, 0, 0, 0, __flags, 0, 0, 0, 0 66 #endif 67 68 #endif 69