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-rw-r--r--nptl/sysdeps/i386/pthread_spin_lock.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/nptl/sysdeps/i386/pthread_spin_lock.c b/nptl/sysdeps/i386/pthread_spin_lock.c
new file mode 100644
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+++ b/nptl/sysdeps/i386/pthread_spin_lock.c
@@ -0,0 +1,48 @@
+/* Copyright (C) 2002 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"
+
+
+#ifdef UP
+# define LOCK
+#else
+# define LOCK "lock;"
+#endif
+
+
+int
+pthread_spin_lock (lock)
+ pthread_spinlock_t *lock;
+{
+ asm ("\n"
+ "1:\t" LOCK "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)
+ : "0" (*lock));
+
+ return 0;
+}