| 1 | /* Get priority ceiling setting from pthread_mutexattr_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 <pthreadP.h> |
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| 20 | #include <atomic.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_mutexattr_getprioceiling (const pthread_mutexattr_t *attr, |
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| 25 | int *prioceiling) |
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| 26 | { |
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| 27 | const struct pthread_mutexattr *iattr; |
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| 28 | int ceiling; |
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| 29 | |
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| 30 | iattr = (const struct pthread_mutexattr *) attr; |
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| 31 | |
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| 32 | ceiling = ((iattr->mutexkind & PTHREAD_MUTEXATTR_PRIO_CEILING_MASK) |
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| 33 | >> PTHREAD_MUTEXATTR_PRIO_CEILING_SHIFT); |
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| 34 | |
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| 35 | if (! ceiling) |
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| 36 | { |
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| 37 | /* See __init_sched_fifo_prio. */ |
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| 38 | if (atomic_load_relaxed (&__sched_fifo_min_prio) == -1) |
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| 39 | __init_sched_fifo_prio (); |
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| 40 | if (ceiling < atomic_load_relaxed (&__sched_fifo_min_prio)) |
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| 41 | ceiling = atomic_load_relaxed (&__sched_fifo_min_prio); |
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| 42 | } |
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| 43 | |
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| 44 | *prioceiling = ceiling; |
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| 45 | |
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| 46 | return 0; |
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| 47 | } |
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| 48 | versioned_symbol (libc, __pthread_mutexattr_getprioceiling, |
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| 49 | pthread_mutexattr_getprioceiling, GLIBC_2_34); |
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| 50 | |
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| 51 | #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_4, GLIBC_2_34) |
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| 52 | compat_symbol (libpthread, __pthread_mutexattr_getprioceiling, |
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| 53 | pthread_mutexattr_getprioceiling, GLIBC_2_4); |
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| 54 | #endif |
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| 55 | |
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