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diff --git a/uts/common/sys/taskq.h b/uts/common/sys/taskq.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 2009 Sun Microsystems, Inc. All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _SYS_TASKQ_H
+#define _SYS_TASKQ_H
+
+#include <sys/types.h>
+#include <sys/thread.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define TASKQ_NAMELEN 31
+
+typedef struct taskq taskq_t;
+typedef uintptr_t taskqid_t;
+typedef void (task_func_t)(void *);
+
+struct proc;
+
+/*
+ * Public flags for taskq_create(): bit range 0-15
+ */
+#define TASKQ_PREPOPULATE 0x0001 /* Prepopulate with threads and data */
+#define TASKQ_CPR_SAFE 0x0002 /* Use CPR safe protocol */
+#define TASKQ_DYNAMIC 0x0004 /* Use dynamic thread scheduling */
+#define TASKQ_THREADS_CPU_PCT 0x0008 /* number of threads as % of ncpu */
+#define TASKQ_DC_BATCH 0x0010 /* Taskq uses SDC in batch mode */
+
+/*
+ * Flags for taskq_dispatch. TQ_SLEEP/TQ_NOSLEEP should be same as
+ * KM_SLEEP/KM_NOSLEEP.
+ */
+#define TQ_SLEEP 0x00 /* Can block for memory */
+#define TQ_NOSLEEP 0x01 /* cannot block for memory; may fail */
+#define TQ_NOQUEUE 0x02 /* Do not enqueue if can't dispatch */
+#define TQ_NOALLOC 0x04 /* cannot allocate memory; may fail */
+#define TQ_FRONT 0x08 /* Put task at the front of the queue */
+
+#ifdef _KERNEL
+
+extern taskq_t *system_taskq;
+
+extern void taskq_init(void);
+extern void taskq_mp_init(void);
+
+extern taskq_t *taskq_create(const char *, int, pri_t, int, int, uint_t);
+extern taskq_t *taskq_create_instance(const char *, int, int, pri_t, int,
+ int, uint_t);
+extern taskq_t *taskq_create_proc(const char *, int, pri_t, int, int,
+ struct proc *, uint_t);
+extern taskq_t *taskq_create_sysdc(const char *, int, int, int,
+ struct proc *, uint_t, uint_t);
+extern taskqid_t taskq_dispatch(taskq_t *, task_func_t, void *, uint_t);
+extern void nulltask(void *);
+extern void taskq_destroy(taskq_t *);
+extern void taskq_wait(taskq_t *);
+extern void taskq_suspend(taskq_t *);
+extern int taskq_suspended(taskq_t *);
+extern void taskq_resume(taskq_t *);
+extern int taskq_member(taskq_t *, kthread_t *);
+
+#endif /* _KERNEL */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SYS_TASKQ_H */