1 files changed, 48 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/i386/pthread_spin_lock.c b/libpthread/nptl/sysdeps/i386/pthread_spin_lock.c
new file mode 100644
index 000000000..a6b1cf403
--- /dev/null
+++ b/libpthread/nptl/sysdeps/i386/pthread_spin_lock.c
@@ -0,0 +1,48 @@
+/* Copyright (C) 2002,2003,2004 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include "pthreadP.h"
+
+#ifndef LOCK_PREFIX
+# ifdef UP
+#  define LOCK_PREFIX	/* nothing */
+# else
+#  define LOCK_PREFIX	"lock;"
+# endif
+#endif
+
+
+int
+pthread_spin_lock (pthread_spinlock_t *lock)
+{
+  __asm__ ("\n"
+       "1:\t" LOCK_PREFIX "decl %0\n\t"
+       "jne 2f\n\t"
+       ".subsection 1\n\t"
+       ".align 16\n"
+       "2:\trep; nop\n\t"
+       "cmpl $0, %0\n\t"
+       "jg 1b\n\t"
+       "jmp 2b\n\t"
+       ".previous"
+       : "=m" (*lock)
+       : "m" (*lock));
+
+  return 0;
+}