| /* elision-unlock.c: Commit an elided pthread lock. |
| Copyright (C) 2015-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include "pthreadP.h" |
| #include "lowlevellock.h" |
| #include "htm.h" |
| |
| int |
| __lll_unlock_elision (int *lock, short *adapt_count, int pshared) |
| { |
| #ifndef __SPE__ |
| /* When the lock was free we're in a transaction. */ |
| if (*lock == 0) |
| __libc_tend (0); |
| else |
| { |
| /* Update adapt_count in the critical section to prevent a |
| write-after-destroy error as mentioned in BZ 20822. The |
| following update of adapt_count has to be contained within |
| the critical region of the fall-back lock in order to not violate |
| the mutex destruction requirements. */ |
| short __tmp = atomic_load_relaxed (adapt_count); |
| if (__tmp > 0) |
| atomic_store_relaxed (adapt_count, __tmp - 1); |
| |
| lll_unlock ((*lock), pshared); |
| } |
| #else |
| lll_unlock ((*lock), pshared); |
| #endif |
| return 0; |
| } |
