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