1 /* 2 * Copyright (c) 2019 François Tigeot <ftigeot@wolfpond.org> 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 <linux/wait.h> 28 #include <linux/sched.h> 29 30 int 31 default_wake_function(wait_queue_t *q, unsigned mode, int wake_flags, void *key) 32 { 33 return wake_up_process(q->private); 34 } 35 36 int 37 autoremove_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key) 38 { 39 int ret = default_wake_function(wait, mode, sync, key); 40 41 /* Was the process woken up ? */ 42 if (ret) 43 list_del_init(&wait->task_list); 44 45 return ret; 46 } 47 48 void 49 __wake_up_core(wait_queue_head_t *q, int num_to_wake_up) 50 { 51 wait_queue_t *curr, *next; 52 int mode = TASK_NORMAL; 53 54 list_for_each_entry_safe(curr, next, &q->task_list, task_list) { 55 if (curr->func(curr, mode, 0, NULL)) 56 num_to_wake_up--; 57 58 if (num_to_wake_up == 0) 59 break; 60 } 61 } 62