1 files changed, 90 insertions, 0 deletions
diff --git a/usr/src/uts/common/sys/waitq.h b/usr/src/uts/common/sys/waitq.h
new file mode 100644
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+++ b/usr/src/uts/common/sys/waitq.h
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+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _SYS_WAITQ_H
+#define	_SYS_WAITQ_H
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#ifdef	_KERNEL
+
+#include <sys/types.h>
+#include <sys/machlock.h>
+#include <sys/thread.h>
+
+typedef struct waitq {
+	disp_lock_t	wq_lock;	/* protects all fields */
+	kthread_t	*wq_first;	/* first thread on the queue */
+	int		wq_count;	/* number of threads on the queue */
+	boolean_t	wq_blocked;	/* True if threads can't be enqueued */
+} waitq_t;
+
+extern void		waitq_init(waitq_t *);
+extern void		waitq_fini(waitq_t *);
+
+/*
+ * Place the thread on the wait queue. An attempt to enqueue a thread onto a
+ * blocked queue fails and returns zero. Successful enqueue returns non-zero
+ * value.
+ */
+extern int		waitq_enqueue(waitq_t *, kthread_t *);
+
+/*
+ * Take thread off its wait queue and make it runnable.
+ */
+extern void		waitq_setrun(kthread_t *t);
+
+/*
+ * Change priority for the thread on wait queue.
+ */
+extern void		waitq_change_pri(kthread_t *, pri_t);
+
+/*
+ * Take the first thread off the wait queue and make it runnable.
+ */
+extern void		waitq_runone(waitq_t *);
+
+/*
+ * Return True if there are no threads on the queue.
+ */
+extern boolean_t	waitq_isempty(waitq_t *);
+
+/*
+ * Prevent and allow placing new threads on wait queue.
+ */
+extern void		waitq_block(waitq_t *);
+extern void		waitq_unblock(waitq_t *);
+
+#endif	/* _KERNEL */
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* _SYS_WAITQ_H */