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-rw-r--r--libpthread/nptl/sysdeps/i386/i486/pthread_spin_trylock.S47
1 files changed, 47 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/i386/i486/pthread_spin_trylock.S b/libpthread/nptl/sysdeps/i386/i486/pthread_spin_trylock.S
new file mode 100644
index 000000000..e30072c3d
--- /dev/null
+++ b/libpthread/nptl/sysdeps/i386/i486/pthread_spin_trylock.S
@@ -0,0 +1,47 @@
+/* Copyright (C) 2002, 2003 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 <pthread-errnos.h>
+
+
+#ifdef UP
+# define LOCK
+#else
+# define LOCK lock
+#endif
+
+ .globl pthread_spin_trylock
+ .type pthread_spin_trylock,@function
+ .align 16
+pthread_spin_trylock:
+ movl 4(%esp), %edx
+ movl $1, %eax
+ xorl %ecx, %ecx
+ LOCK
+ cmpxchgl %ecx, (%edx)
+ movl $EBUSY, %eax
+#ifdef HAVE_CMOV
+ cmovel %ecx, %eax
+#else
+ jne 0f
+ movl %ecx, %eax
+0:
+#endif
+ ret
+ .size pthread_spin_trylock,.-pthread_spin_trylock