1 /* HPPA 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 <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 /* In the old Linuxthreads pthread_rwlock_t, this is the 26 start of the 4-word 16-byte aligned lock structure. The 27 next four words are all set to 1 by the Linuxthreads 28 PTHREAD_RWLOCK_INITIALIZER. We ignore them in NPTL. */ 29 int __compat_padding[4] __attribute__ ((__aligned__(16))); 30 unsigned int __readers; 31 unsigned int __writers; 32 unsigned int __wrphase_futex; 33 unsigned int __writers_futex; 34 unsigned int __pad3; 35 unsigned int __pad4; 36 int __cur_writer; 37 /* An unused word, reserved for future use. It was added 38 to maintain the location of the flags from the Linuxthreads 39 layout of this structure. */ 40 int __reserved1; 41 /* FLAGS must stay at this position in the structure to maintain 42 binary compatibility. */ 43 unsigned char __pad2; 44 unsigned char __pad1; 45 unsigned char __shared; 46 unsigned char __flags; 47 /* The NPTL pthread_rwlock_t is 4 words smaller than the 48 Linuxthreads version. One word is in the middle of the 49 structure, the other three are at the end. */ 50 int __reserved2; 51 int __reserved3; 52 int __reserved4; 53 }; 54 55 #define __PTHREAD_RWLOCK_INITIALIZER(__flags) \ 56 { 0, 0, 0, 0 }, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, __flags, 0, 0, 0 57 58 #endif 59