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      1 /*	$NetBSD: async.h,v 1.5 2021/12/19 11:39:38 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2018 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Taylor R. Campbell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _LINUX_ASYNC_H_
     33 #define _LINUX_ASYNC_H_
     34 
     35 typedef unsigned long async_cookie_t;
     36 
     37 /*
     38  * async_schedule(fn, arg)
     39  *
     40  *	Schedule the kernel to run fn(arg, cookie) at some point to
     41  *	avoid slowing down boot, or call it synchronously if memory is
     42  *	short.  Returns a cookie that can be used to wait for the
     43  *	function to have been called.
     44  */
     45 static inline async_cookie_t
     46 async_schedule(void (*fn)(void *, async_cookie_t), void *arg)
     47 {
     48 
     49 	(*fn)(arg, 1);
     50 	return 1;
     51 }
     52 
     53 /*
     54  * async_synchronize_full()
     55  *
     56  *	Wait for all outstanding asynchronous actions to have completed
     57  *	before returning.
     58  */
     59 static inline void
     60 async_synchronize_full(void)
     61 {
     62 }
     63 
     64 /*
     65  * async_synchronize_cookie(cookie)
     66  *
     67  *	Wait until the function passed to the async_schedule call that
     68  *	returned cookie has completed.
     69  */
     70 static inline void
     71 async_synchronize_cookie(unsigned long cookie)
     72 {
     73 }
     74 
     75 #endif /* _LINUX_ASYNC_H_ */
     76