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).

1 files changed, 0 insertions, 61 deletions

diff --git a/nptl/pthread_rwlock_trywrlock.c b/nptl/pthread_rwlock_trywrlock.c
deleted file mode 100644
index 0d9ccaf79c..0000000000
--- a/nptl/pthread_rwlock_trywrlock.c
+++ /dev/null
@@ -1,61 +0,0 @@
-/* Copyright (C) 2002-2017 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
-
-   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 <errno.h>
-#include "pthreadP.h"
-#include <atomic.h>
-
-/* See pthread_rwlock_common.c for an overview.  */
-int
-__pthread_rwlock_trywrlock (pthread_rwlock_t *rwlock)
-{
-  /* When in a trywrlock, we can acquire the write lock if it is in states
-     #1 (idle and read phase) and #5 (idle and write phase), and also in #6
-     (readers waiting, write phase) if we prefer writers.
-     If we observe any other state, we are allowed to fail and do not need to
-     "synchronize memory" as specified by POSIX (hence relaxed MO is
-     sufficient for the first load and the CAS failure path).
-     We face a similar issue as in tryrdlock in that we need to both avoid
-     live-locks / starvation and must not fail spuriously (see there for
-     further comments) -- and thus must loop until we get a definitive
-     observation or state change.  */
-  unsigned int r = atomic_load_relaxed (&rwlock->__data.__readers);
-  bool prefer_writer =
-      (rwlock->__data.__flags != PTHREAD_RWLOCK_PREFER_READER_NP);
-  while (((r & PTHREAD_RWLOCK_WRLOCKED) == 0)
-      && (((r >> PTHREAD_RWLOCK_READER_SHIFT) == 0)
-	  || (prefer_writer && ((r & PTHREAD_RWLOCK_WRPHASE) != 0))))
-    {
-      /* Try to transition to states #7 or #8 (i.e., acquire the lock).  */
-      if (atomic_compare_exchange_weak_acquire (
-	  &rwlock->__data.__readers, &r,
-	  r | PTHREAD_RWLOCK_WRPHASE | PTHREAD_RWLOCK_WRLOCKED))
-	{
-	  atomic_store_relaxed (&rwlock->__data.__writers_futex, 1);
-	  atomic_store_relaxed (&rwlock->__data.__wrphase_futex, 1);
-	  atomic_store_relaxed (&rwlock->__data.__cur_writer,
-	      THREAD_GETMEM (THREAD_SELF, tid));
-	  return 0;
-	}
-      /* TODO Back-off.  */
-      /* See above.  */
-    }
-  return EBUSY;
-}
-
-strong_alias (__pthread_rwlock_trywrlock, pthread_rwlock_trywrlock)