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authorZack Weinberg <zackw@panix.com>2017-06-08 15:39:03 -0400
committerZack Weinberg <zackw@panix.com>2017-06-08 15:39:03 -0400
commit5046dbb4a7eba5eccfd258f92f4735c9ffc8d069 (patch)
tree4470480d904b65cf14ca524f96f79eca818c3eaf /sysdeps/unix/sysv/linux/powerpc/elision-lock.c
parent199fc19d3aaaf57944ef036e15904febe877fc93 (diff)
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Prepare for radical source tree reorganization.zack/build-layout-experiment
All top-level files and directories are moved into a temporary storage directory, REORG.TODO, except for files that will certainly still exist in their current form at top level when we're done (COPYING, COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which are moved to the new directory OldChangeLogs, instead), and the generated file INSTALL (which is just deleted; in the new order, there will be no generated files checked into version control).
Diffstat (limited to 'sysdeps/unix/sysv/linux/powerpc/elision-lock.c')
-rw-r--r--sysdeps/unix/sysv/linux/powerpc/elision-lock.c86
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);
-}