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, 146 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/sparc/sparc32/sem_waitcommon.c b/REORG.TODO/sysdeps/sparc/sparc32/sem_waitcommon.c
new file mode 100644
index 0000000000..08fd12ce50
--- /dev/null
+++ b/REORG.TODO/sysdeps/sparc/sparc32/sem_waitcommon.c
@@ -0,0 +1,146 @@
+/* sem_waitcommon -- wait on a semaphore, shared code.
+   Copyright (C) 2003-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
+
+   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 <sysdep.h>
+#include <futex-internal.h>
+#include <internaltypes.h>
+#include <semaphore.h>
+#include <sys/time.h>
+
+#include <pthreadP.h>
+#include <shlib-compat.h>
+#include <atomic.h>
+
+
+static void
+__sem_wait_32_finish (struct new_sem *sem);
+
+static void
+__sem_wait_cleanup (void *arg)
+{
+  struct new_sem *sem = (struct new_sem *) arg;
+
+  __sem_wait_32_finish (sem);
+}
+
+/* Wait until at least one token is available, possibly with a timeout.
+   This is in a separate function in order to make sure gcc
+   puts the call site into an exception region, and thus the
+   cleanups get properly run.  TODO still necessary?  Other futex_wait
+   users don't seem to need it.  */
+static int
+__attribute__ ((noinline))
+do_futex_wait (struct new_sem *sem, const struct timespec *abstime)
+{
+  int err;
+
+  err = futex_abstimed_wait_cancelable (&sem->value, SEM_NWAITERS_MASK,
+					abstime, sem->private);
+
+  return err;
+}
+
+/* Fast path: Try to grab a token without blocking.  */
+static int
+__new_sem_wait_fast (struct new_sem *sem, int definitive_result)
+{
+  unsigned int v;
+  int ret = 0;
+
+  __sparc32_atomic_do_lock24(&sem->pad);
+
+  v = sem->value;
+  if ((v >> SEM_VALUE_SHIFT) == 0)
+    ret = -1;
+  else
+    sem->value = v - (1 << SEM_VALUE_SHIFT);
+
+  __sparc32_atomic_do_unlock24(&sem->pad);
+
+  return ret;
+}
+
+/* Slow path that blocks.  */
+static int
+__attribute__ ((noinline))
+__new_sem_wait_slow (struct new_sem *sem, const struct timespec *abstime)
+{
+  unsigned int v;
+  int err = 0;
+
+  __sparc32_atomic_do_lock24(&sem->pad);
+
+  sem->nwaiters++;
+
+  pthread_cleanup_push (__sem_wait_cleanup, sem);
+
+  /* Wait for a token to be available.  Retry until we can grab one.  */
+  v = sem->value;
+  do
+    {
+      if (!(v & SEM_NWAITERS_MASK))
+	sem->value = v | SEM_NWAITERS_MASK;
+
+      /* If there is no token, wait.  */
+      if ((v >> SEM_VALUE_SHIFT) == 0)
+	{
+	  __sparc32_atomic_do_unlock24(&sem->pad);
+
+	  err = do_futex_wait(sem, abstime);
+	  if (err == ETIMEDOUT || err == EINTR)
+	    {
+	      __set_errno (err);
+	      err = -1;
+	      goto error;
+	    }
+	  err = 0;
+
+	  __sparc32_atomic_do_lock24(&sem->pad);
+
+	  /* We blocked, so there might be a token now.  */
+	  v = sem->value;
+	}
+    }
+  /* If there is no token, we must not try to grab one.  */
+  while ((v >> SEM_VALUE_SHIFT) == 0);
+
+  sem->value = v - (1 << SEM_VALUE_SHIFT);
+
+  __sparc32_atomic_do_unlock24(&sem->pad);
+
+error:
+  pthread_cleanup_pop (0);
+
+  __sem_wait_32_finish (sem);
+
+  return err;
+}
+
+/* Stop being a registered waiter (non-64b-atomics code only).  */
+static void
+__sem_wait_32_finish (struct new_sem *sem)
+{
+  __sparc32_atomic_do_lock24(&sem->pad);
+
+  if (--sem->nwaiters == 0)
+    sem->value &= ~SEM_NWAITERS_MASK;
+
+  __sparc32_atomic_do_unlock24(&sem->pad);
+}