Revert "resolve merge"

This reverts commit 6b6ede3d15f04fe825cfa9f697507457e3640344.

1 files changed, 87 insertions, 0 deletions

diff --git a/libpthread/linuxthreads/sysdeps/sparc/pspinlock.c b/libpthread/linuxthreads/sysdeps/sparc/pspinlock.c
new file mode 100644
index 000000000..4de152be3
--- /dev/null
+++ b/libpthread/linuxthreads/sysdeps/sparc/pspinlock.c
@@ -0,0 +1,87 @@
+/* POSIX spinlock implementation.  SPARC32 version.
+   Copyright (C) 2000 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; see the file COPYING.LIB.  If
+   not, see <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <pthread.h>
+#include "internals.h"
+
+/* This implementation is similar to the one used in the Linux kernel.  */
+int
+__pthread_spin_lock (pthread_spinlock_t *lock)
+{
+  __asm__ __volatile__
+    ("1: ldstub [%0], %%g2\n"
+     "   orcc   %%g2, 0x0, %%g0\n"
+     "   bne,a  2f\n"
+     "   ldub   [%0], %%g2\n"
+     ".subsection 2\n"
+     "2: orcc   %%g2, 0x0, %%g0\n"
+     "   bne,a  2b\n"
+     "   ldub   [%0], %%g2\n"
+     "   b,a    1b\n"
+     ".previous"
+     : /* no outputs */
+     : "r" (lock)
+     : "g2", "memory", "cc");
+  return 0;
+}
+weak_alias (__pthread_spin_lock, pthread_spin_lock)
+
+
+int
+__pthread_spin_trylock (pthread_spinlock_t *lock)
+{
+  int result;
+  __asm__ __volatile__
+    ("ldstub [%1], %0"
+     : "=r" (result)
+     : "r" (lock)
+     : "memory");
+  return result == 0 ? 0 : EBUSY;
+}
+weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
+
+
+int
+__pthread_spin_unlock (pthread_spinlock_t *lock)
+{
+  *lock = 0;
+  return 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.  */
+  *lock = 0;
+  return 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)