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8d2c0a59 | 1 | /* elision-unlock.c: Commit an elided pthread lock. |
6d7e8eda | 2 | Copyright (C) 2015-2023 Free Software Foundation, Inc. |
8d2c0a59 AZ |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
8d2c0a59 AZ |
18 | |
19 | #include "pthreadP.h" | |
20 | #include "lowlevellock.h" | |
21 | #include "htm.h" | |
22 | ||
23 | int | |
fadd2ad9 | 24 | __lll_unlock_elision (int *lock, short *adapt_count, int pshared) |
8d2c0a59 AZ |
25 | { |
26 | /* When the lock was free we're in a transaction. */ | |
27 | if (*lock == 0) | |
42bf1c89 | 28 | __libc_tend (0); |
8d2c0a59 | 29 | else |
fadd2ad9 | 30 | { |
e9a96ea1 TMQMF |
31 | /* Update adapt_count in the critical section to prevent a |
32 | write-after-destroy error as mentioned in BZ 20822. The | |
33 | following update of adapt_count has to be contained within | |
34 | the critical region of the fall-back lock in order to not violate | |
35 | the mutex destruction requirements. */ | |
36 | short __tmp = atomic_load_relaxed (adapt_count); | |
37 | if (__tmp > 0) | |
eb1321f2 | 38 | atomic_store_relaxed (adapt_count, __tmp - 1); |
fadd2ad9 | 39 | |
e9a96ea1 | 40 | lll_unlock ((*lock), pshared); |
fadd2ad9 | 41 | } |
8d2c0a59 AZ |
42 | return 0; |
43 | } | |
5a664d7a | 44 | libc_hidden_def (__lll_unlock_elision) |