--- /dev/null
+/*
+ * Copyright (c) 2008 Niels Provos <provos@citi.umich.edu>
+ * 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. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+#ifndef _EVENT2_THREAD_H_
+#define _EVENT2_THREAD_H_
+
+/** @file thread.h
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <event-config.h>
+
+/* combine (lock|unlock) with (read|write) */
+#define EVTHREAD_LOCK 0x01
+#define EVTHREAD_UNLOCK 0x02
+#define EVTHREAD_WRITE 0x04
+#define EVTHREAD_READ 0x08
+
+/** returns the number of locks that need to be allocated */
+int evthread_num_locks();
+
+struct event_base;
+void evthread_set_locking_callback(struct event_base *base,
+ void (*locking_fn)(int mode, int locknum));
+void evthread_set_id_callback(struct event_base *base,
+ unsigned long (*id_fn)(void));
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _EVENT2_THREAD_H_ */