diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/powerpc/elision-trylock.c')
-rw-r--r-- | sysdeps/unix/sysv/linux/powerpc/elision-trylock.c | 69 |
1 files changed, 0 insertions, 69 deletions
diff --git a/sysdeps/unix/sysv/linux/powerpc/elision-trylock.c b/sysdeps/unix/sysv/linux/powerpc/elision-trylock.c deleted file mode 100644 index ed244d3f12..0000000000 --- a/sysdeps/unix/sysv/linux/powerpc/elision-trylock.c +++ /dev/null @@ -1,69 +0,0 @@ -/* elision-trylock.c: Lock eliding trylock for pthreads. - 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 <pthread.h> -#include <pthreadP.h> -#include <lowlevellock.h> -#include <elision-conf.h> -#include "htm.h" - -#define aconf __elision_aconf - -/* Try to elide a futex trylock. FUTEX is the futex variable. ADAPT_COUNT is - the adaptation counter in the mutex. */ - -int -__lll_trylock_elision (int *futex, short *adapt_count) -{ - /* Implement POSIX semantics by forbiding nesting elided trylocks. */ - __libc_tabort (_ABORT_NESTED_TRYLOCK); - - /* Only try a transaction if it's worth it. */ - if (atomic_load_relaxed (adapt_count) > 0) - { - goto use_lock; - } - - if (__libc_tbegin (0)) - { - if (*futex == 0) - return 0; - - /* Lock was busy. This is never a nested transaction. - End it, and set the adapt count. */ - __libc_tend (0); - - if (aconf.skip_lock_busy > 0) - atomic_store_relaxed (adapt_count, aconf.skip_lock_busy); - } - else - { - if (_TEXASRU_FAILURE_PERSISTENT (__builtin_get_texasru ())) - { - /* A persistent failure indicates that a retry will probably - result in another failure. Use normal locking now and - for the next couple of calls. */ - if (aconf.skip_trylock_internal_abort > 0) - atomic_store_relaxed (adapt_count, - aconf.skip_trylock_internal_abort); - } - } - -use_lock: - return lll_trylock (*futex); -} |