| 1 | /* Copyright (C) 2002-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include "pthreadP.h" |
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| 19 | #include <string.h> |
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| 20 | #include <pthread-offsets.h> |
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| 21 | #include <shlib-compat.h> |
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| 22 | |
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| 23 | static const struct pthread_rwlockattr default_rwlockattr = |
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| 24 | { |
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| 25 | .lockkind = PTHREAD_RWLOCK_DEFAULT_NP, |
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| 26 | .pshared = PTHREAD_PROCESS_PRIVATE |
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| 27 | }; |
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| 28 | |
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| 29 | |
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| 30 | /* See pthread_rwlock_common.c. */ |
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| 31 | int |
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| 32 | ___pthread_rwlock_init (pthread_rwlock_t *rwlock, |
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| 33 | const pthread_rwlockattr_t *attr) |
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| 34 | { |
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| 35 | ASSERT_TYPE_SIZE (pthread_rwlock_t, __SIZEOF_PTHREAD_RWLOCK_T); |
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| 36 | |
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| 37 | /* The __flags is the only field where its offset should be checked to |
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| 38 | avoid ABI breakage with static initializers. */ |
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| 39 | ASSERT_PTHREAD_INTERNAL_OFFSET (pthread_rwlock_t, __data.__flags, |
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| 40 | __PTHREAD_RWLOCK_FLAGS_OFFSET); |
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| 41 | ASSERT_PTHREAD_INTERNAL_MEMBER_SIZE (pthread_rwlock_t, __data.__flags, |
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| 42 | int); |
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| 43 | |
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| 44 | const struct pthread_rwlockattr *iattr; |
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| 45 | |
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| 46 | iattr = ((const struct pthread_rwlockattr *) attr) ?: &default_rwlockattr; |
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| 47 | |
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| 48 | memset (rwlock, '\0', sizeof (*rwlock)); |
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| 49 | |
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| 50 | rwlock->__data.__flags = iattr->lockkind; |
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| 51 | |
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| 52 | /* The value of __SHARED in a private rwlock must be zero. */ |
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| 53 | rwlock->__data.__shared = (iattr->pshared != PTHREAD_PROCESS_PRIVATE); |
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| 54 | |
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| 55 | return 0; |
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| 56 | } |
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| 57 | versioned_symbol (libc, ___pthread_rwlock_init, pthread_rwlock_init, |
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| 58 | GLIBC_2_34); |
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| 59 | libc_hidden_ver (___pthread_rwlock_init, __pthread_rwlock_init) |
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| 60 | #ifndef SHARED |
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| 61 | strong_alias (___pthread_rwlock_init, __pthread_rwlock_init) |
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| 62 | #endif |
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| 63 | |
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| 64 | #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_1, GLIBC_2_34) |
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| 65 | compat_symbol (libpthread, ___pthread_rwlock_init, pthread_rwlock_init, |
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| 66 | GLIBC_2_1); |
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| 67 | #endif |
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| 68 | #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_2, GLIBC_2_34) |
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| 69 | compat_symbol (libpthread, ___pthread_rwlock_init, __pthread_rwlock_init, |
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| 70 | GLIBC_2_2); |
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| 71 | #endif |
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| 72 | |
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