diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/powerpc/elision-unlock.c')
-rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/powerpc/elision-unlock.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/powerpc/elision-unlock.c b/REORG.TODO/sysdeps/unix/sysv/linux/powerpc/elision-unlock.c new file mode 100644 index 0000000000..e3fe58e3f1 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/powerpc/elision-unlock.c @@ -0,0 +1,43 @@ +/* elision-unlock.c: Commit an elided pthread lock. + Copyright (C) 2015-2017 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) +{ + /* 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); + } + return 0; +} |