diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/powerpc/elision-lock.c')
-rw-r--r-- | sysdeps/unix/sysv/linux/powerpc/elision-lock.c | 86 |
1 files changed, 0 insertions, 86 deletions
diff --git a/sysdeps/unix/sysv/linux/powerpc/elision-lock.c b/sysdeps/unix/sysv/linux/powerpc/elision-lock.c deleted file mode 100644 index f7a5cbcd3a..0000000000 --- a/sysdeps/unix/sysv/linux/powerpc/elision-lock.c +++ /dev/null @@ -1,86 +0,0 @@ -/* elision-lock.c: Elided pthread mutex 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 <stdio.h> -#include <pthread.h> -#include <pthreadP.h> -#include <lowlevellock.h> -#include <elision-conf.h> -#include "htm.h" - -#if !defined(LLL_LOCK) && !defined(EXTRAARG) -/* Make sure the configuration code is always linked in for static - libraries. */ -#include "elision-conf.c" -#endif - -#ifndef EXTRAARG -# define EXTRAARG -#endif -#ifndef LLL_LOCK -# define LLL_LOCK(a,b) lll_lock(a,b), 0 -#endif - -#define aconf __elision_aconf - -/* Adaptive lock using transactions. - By default the lock region is run as a transaction, and when it - aborts or the lock is busy the lock adapts itself. */ - -int -__lll_lock_elision (int *lock, short *adapt_count, EXTRAARG int pshared) -{ - /* adapt_count is accessed concurrently but is just a hint. Thus, - use atomic accesses but relaxed MO is sufficient. */ - if (atomic_load_relaxed (adapt_count) > 0) - { - goto use_lock; - } - - for (int i = aconf.try_tbegin; i > 0; i--) - { - if (__libc_tbegin (0)) - { - if (*lock == 0) - return 0; - /* Lock was busy. Fall back to normal locking. */ - __libc_tabort (_ABORT_LOCK_BUSY); - } - else - { - /* 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 (_TEXASRU_FAILURE_PERSISTENT (__builtin_get_texasru ())) - { - if (aconf.skip_lock_internal_abort > 0) - atomic_store_relaxed (adapt_count, - aconf.skip_lock_internal_abort); - goto use_lock; - } - } - } - - /* Fall back to locks for a bit if retries have been exhausted */ - if (aconf.try_tbegin > 0 && aconf.skip_lock_out_of_tbegin_retries > 0) - atomic_store_relaxed (adapt_count, - aconf.skip_lock_out_of_tbegin_retries); - -use_lock: - return LLL_LOCK ((*lock), pshared); -} |