freebsd kqueue implementation

sys/sys/eventvar.h

@@ -0,0 +1,46 @@
+/*-
+ * Copyright (c) 1999,2000 Jonathan Lemon <jlemon@FreeBSD.org>
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ *
+ *	$FreeBSD: src/sys/sys/eventvar.h,v 1.4 2000/07/18 19:31:48 jlemon Exp $
+ */
+
+#ifndef _SYS_EVENTVAR_H_
+#define _SYS_EVENTVAR_H_
+
+#define KQ_NEVENTS	8		/* minimize copy{in,out} calls */
+#define KQEXTENT	256		/* linear growth by this amount */
+
+struct kqueue {
+	TAILQ_HEAD(kqlist, knote) kq_head;	/* list of pending event */
+	int		kq_count;		/* number of pending events */
+	struct		selinfo kq_sel;	
+	struct		filedesc *kq_fdp;
+	int		kq_state;
+#define KQ_SEL		0x01
+#define KQ_SLEEP	0x02
+	struct		kevent kq_kev[KQ_NEVENTS];
+};
+
+#endif /* !_SYS_EVENTVAR_H_ */