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diff --git a/lib/isc/task_p.h b/lib/isc/task_p.h
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+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#pragma once
+
+#include <isc/mem.h>
+#include <isc/result.h>
+#include <isc/task.h>
+
+isc_result_t
+isc__taskmgr_create(isc_mem_t *mctx, unsigned int default_quantum, isc_nm_t *nm,
+		    isc_taskmgr_t **managerp);
+/*%<
+ * Create a new task manager.
+ *
+ * Notes:
+ *
+ *\li	If 'default_quantum' is non-zero, then it will be used as the default
+ *	quantum value when tasks are created.  If zero, then an implementation
+ *	defined default quantum will be used.
+ *
+ *\li	If 'nm' is set then netmgr is paused when an exclusive task mode
+ *	is requested.
+ *
+ * Requires:
+ *
+ *\li      'mctx' is a valid memory context.
+ *
+ *\li	managerp != NULL && *managerp == NULL
+ *
+ * Ensures:
+ *
+ *\li	On success, '*managerp' will be attached to the newly created task
+ *	manager.
+ *
+ * Returns:
+ *
+ *\li	#ISC_R_SUCCESS
+ *\li	#ISC_R_NOMEMORY
+ *\li	#ISC_R_NOTHREADS		No threads could be created.
+ *\li	#ISC_R_UNEXPECTED		An unexpected error occurred.
+ *\li	#ISC_R_SHUTTINGDOWN		The non-threaded, shared, task
+ *					manager shutting down.
+ */
+
+void
+isc__taskmgr_destroy(isc_taskmgr_t **managerp);
+/*%<
+ * Destroy '*managerp'.
+ *
+ * Notes:
+ *
+ *\li	Calling isc_taskmgr_destroy() will shutdown all tasks managed by
+ *	*managerp that haven't already been shutdown.  The call will block
+ *	until all tasks have entered the done state.
+ *
+ *\li	isc_taskmgr_destroy() must not be called by a task event action,
+ *	because it would block forever waiting for the event action to
+ *	complete.  An event action that wants to cause task manager shutdown
+ *	should request some non-event action thread of execution to do the
+ *	shutdown, e.g. by signaling a condition variable or using
+ *	isc_app_shutdown().
+ *
+ *\li	Task manager references are not reference counted, so the caller
+ *	must ensure that no attempt will be made to use the manager after
+ *	isc_taskmgr_destroy() returns.
+ *
+ * Requires:
+ *
+ *\li	'*managerp' is a valid task manager.
+ *
+ *\li   'isc__taskmgr_shutdown()' and isc__netmgr_shutdown() have been
+ *	called.
+ */
+
+void
+isc__taskmgr_shutdown(isc_taskmgr_t *manager);
+/*%>
+ * Shutdown 'manager'.
+ *
+ * Notes:
+ *
+ *\li	Calling isc__taskmgr_shutdown() will shut down all tasks managed by
+ *	*managerp that haven't already been shut down.
+ *
+ * Requires:
+ *
+ *\li   'manager' is a valid task manager.
+ *
+ *\li	isc_taskmgr_destroy() has not be called previously on '*managerp'.
+ *
+ * Ensures:
+ *
+ *\li	All resources used by the task manager, and any tasks it managed,
+ *	have been freed.
+ */