Revert "resolve merge"

This reverts commit 6b6ede3d15f04fe825cfa9f697507457e3640344.

1 files changed, 78 insertions, 0 deletions

diff --git a/libpthread/linuxthreads/sysdeps/ia64/pspinlock.c b/libpthread/linuxthreads/sysdeps/ia64/pspinlock.c
new file mode 100644
index 000000000..d5e52ff6b
--- /dev/null
+++ b/libpthread/linuxthreads/sysdeps/ia64/pspinlock.c
@@ -0,0 +1,78 @@
+/* POSIX spinlock implementation.  ia64 version.
+   Copyright (C) 2000, 2003 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Jes Sorensen <jes@linuxcare.com>
+
+   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; see the file COPYING.LIB.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <pthread.h>
+#include "internals.h"
+#include <ia64intrin.h>
+
+/* This implementation is inspired by the implementation used in the
+   Linux kernel. */
+
+int
+__pthread_spin_lock (pthread_spinlock_t *lock)
+{
+  int *p = (int *) lock;
+
+  while (__builtin_expect (__sync_val_compare_and_swap (p, 0, 1), 0))
+    {
+      /* Spin without using the atomic instruction.  */
+      do
+        __asm__ __volatile__ ("" : : : "memory");
+      while (*p);
+    }
+  return 0;
+}
+weak_alias (__pthread_spin_lock, pthread_spin_lock)
+
+
+int
+__pthread_spin_trylock (pthread_spinlock_t *lock)
+{
+  return __sync_val_compare_and_swap ((int *) lock, 0, 1) == 0 ? 0 : EBUSY;
+}
+weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
+
+
+int
+__pthread_spin_unlock (pthread_spinlock_t *lock)
+{
+  return *lock = 0;
+}
+weak_alias (__pthread_spin_unlock, pthread_spin_unlock)
+
+
+int
+__pthread_spin_init (pthread_spinlock_t *lock, int pshared)
+{
+  /* We can ignore the `pshared' parameter.  Since we are busy-waiting
+     all processes which can access the memory location `lock' points
+     to can use the spinlock.  */
+  return *lock = 0;
+}
+weak_alias (__pthread_spin_init, pthread_spin_init)
+
+
+int
+__pthread_spin_destroy (pthread_spinlock_t *lock)
+{
+  /* Nothing to do.  */
+  return 0;
+}
+weak_alias (__pthread_spin_destroy, pthread_spin_destroy)