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
async_schedule(void (* fn)(void *,async_cookie_t),void * arg)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
async_synchronize_full(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
async_synchronize_cookie(unsigned long cookie)71 async_synchronize_cookie(unsigned long cookie)
72 {
73 }
74
75 #endif /* _LINUX_ASYNC_H_ */
76