1 files changed, 73 insertions, 0 deletions

diff --git a/src/lib/libc/include/spinlock.h b/src/lib/libc/include/spinlock.h
new file mode 100644
index 0000000000..e4871f9aed
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+++ b/src/lib/libc/include/spinlock.h
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by John Birrell.
+ * 4. Neither the name of the author nor the names of any co-contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $Id: spinlock.h,v 1.1 1998/11/20 11:18:41 d Exp $
+ * $OpenBSD: spinlock.h,v 1.1 1998/11/20 11:18:41 d Exp $
+ *
+ * Lock definitions used in both libc and libpthread.
+ *
+ */
+
+#ifndef _SPINLOCK_H_
+#define _SPINLOCK_H_
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+/*
+ * Lock structure with room for debugging information.
+ */
+typedef struct {
+        volatile register_t     access_lock;
+        volatile long   lock_owner;
+        volatile const char * fname;
+        volatile int    lineno;
+} spinlock_t;
+
+#define _SPINLOCK_INITIALIZER   { 0, 0, 0, 0 }
+
+#define _SPINUNLOCK(_lck)       (_lck)->access_lock = 0
+#ifdef  _LOCK_DEBUG
+#define _SPINLOCK(_lck)         _spinlock_debug(_lck, __FILE__, __LINE__)
+#else
+#define _SPINLOCK(_lck)         _spinlock(_lck)
+#endif
+
+/*
+ * Thread function prototype definitions:
+ */
+__BEGIN_DECLS
+register_t      _atomic_lock __P((volatile register_t *));
+register_t      _thread_slow_atomic_lock __P((volatile register_t *));
+void    _spinlock __P((spinlock_t *));
+void    _spinlock_debug __P((spinlock_t *, const char *, int));
+__END_DECLS
+
+#endif /* _SPINLOCK_H_ */