1 /*- 2 * Copyright (c) 2015 François Tigeot 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/spinlock2.h> 28 #include <linux/async.h> 29 30 static async_cookie_t cookie_counter = 1; 31 32 /* Protects cookie_counter */ 33 static struct lock linux_async_lock; 34 LOCK_SYSINIT(linux_async_lock, &linux_async_lock, "lasync", LK_CANRECURSE); 35 36 /* async_schedule: schedule a function for asynchronous execution */ 37 async_cookie_t async_schedule(async_func_t func, void *data) 38 { 39 async_cookie_t cookie; 40 41 lockmgr(&linux_async_lock, LK_EXCLUSIVE); 42 cookie_counter++; 43 cookie = cookie_counter; 44 lockmgr(&linux_async_lock, LK_RELEASE); 45 46 /* XXX: Just run the function synchronously for now */ 47 func(data, cookie); 48 49 return cookie; 50 } 51