2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2019 Eric van Gyzen
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following 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.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * Free a pending callout. This was useful for testing the
32 * "show callout_last" ddb command.
35 #include <sys/param.h>
37 #include <sys/kernel.h>
39 #include <sys/module.h>
40 #include <sys/mutex.h>
41 #include <sys/systm.h>
43 static struct callout callout_free;
44 static struct mtx callout_free_mutex;
45 static int callout_free_arg;
48 callout_free_func(void *arg)
50 printf("squirrel!\n");
51 mtx_destroy(&callout_free_mutex);
52 memset(&callout_free, 'C', sizeof(callout_free));
56 callout_free_load(module_t mod, int cmd, void *arg)
62 mtx_init(&callout_free_mutex, "callout_free", NULL, MTX_DEF);
64 * Do not pass CALLOUT_RETURNUNLOCKED so the callout
65 * subsystem will unlock the "destroyed" mutex.
67 callout_init_mtx(&callout_free, &callout_free_mutex, 0);
68 printf("callout_free_func = %p\n", callout_free_func);
69 printf("callout_free_arg = %p\n", &callout_free_arg);
70 callout_reset(&callout_free, hz/10, callout_free_func,
87 DEV_MODULE(callout_free, callout_free_load, NULL);