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eb1321f291
Commit e9a96ea1ac had an error that
prevents adapt_count from being updated in __lll_unlock_elision.
44 lines
1.5 KiB
C
44 lines
1.5 KiB
C
/* elision-unlock.c: Commit an elided pthread lock.
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Copyright (C) 2015-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include "pthreadP.h"
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#include "lowlevellock.h"
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#include "htm.h"
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int
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__lll_unlock_elision (int *lock, short *adapt_count, int pshared)
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{
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/* When the lock was free we're in a transaction. */
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if (*lock == 0)
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__libc_tend (0);
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else
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{
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/* Update adapt_count in the critical section to prevent a
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write-after-destroy error as mentioned in BZ 20822. The
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following update of adapt_count has to be contained within
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the critical region of the fall-back lock in order to not violate
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the mutex destruction requirements. */
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short __tmp = atomic_load_relaxed (adapt_count);
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if (__tmp > 0)
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atomic_store_relaxed (adapt_count, __tmp - 1);
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lll_unlock ((*lock), pshared);
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}
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return 0;
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}
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