| 1 | /* Get current priority ceiling of pthread_mutex_t. |
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| 2 | Copyright (C) 2006-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <errno.h> |
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| 20 | #include <pthreadP.h> |
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| 21 | #include <shlib-compat.h> |
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| 22 | |
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| 23 | int |
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| 24 | __pthread_mutex_getprioceiling (const pthread_mutex_t *mutex, int *prioceiling) |
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| 25 | { |
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| 26 | /* See concurrency notes regarding __kind in struct __pthread_mutex_s |
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| 27 | in sysdeps/nptl/bits/thread-shared-types.h. */ |
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| 28 | if (__builtin_expect ((atomic_load_relaxed (&(mutex->__data.__kind)) |
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| 29 | & PTHREAD_MUTEX_PRIO_PROTECT_NP) == 0, 0)) |
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| 30 | return EINVAL; |
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| 31 | |
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| 32 | *prioceiling = (mutex->__data.__lock & PTHREAD_MUTEX_PRIO_CEILING_MASK) |
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| 33 | >> PTHREAD_MUTEX_PRIO_CEILING_SHIFT; |
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| 34 | |
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| 35 | return 0; |
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| 36 | } |
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| 37 | versioned_symbol (libc, __pthread_mutex_getprioceiling, |
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| 38 | pthread_mutex_getprioceiling, GLIBC_2_34); |
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| 39 | |
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| 40 | #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_4, GLIBC_2_34) |
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| 41 | compat_symbol (libpthread, __pthread_mutex_getprioceiling, |
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| 42 | pthread_mutex_getprioceiling, GLIBC_2_4); |
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| 43 | #endif |
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| 44 | |
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