1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10 #include "lock_dlm.h"
11
no_work(struct gdlm_ls * ls)12 static inline int no_work(struct gdlm_ls *ls)
13 {
14 int ret;
15
16 spin_lock(&ls->async_lock);
17 ret = list_empty(&ls->submit);
18 spin_unlock(&ls->async_lock);
19
20 return ret;
21 }
22
gdlm_thread(void * data)23 static int gdlm_thread(void *data)
24 {
25 struct gdlm_ls *ls = (struct gdlm_ls *) data;
26 struct gdlm_lock *lp = NULL;
27
28 while (!kthread_should_stop()) {
29 wait_event_interruptible(ls->thread_wait,
30 !no_work(ls) || kthread_should_stop());
31
32 spin_lock(&ls->async_lock);
33
34 if (!list_empty(&ls->submit)) {
35 lp = list_entry(ls->submit.next, struct gdlm_lock,
36 delay_list);
37 list_del_init(&lp->delay_list);
38 spin_unlock(&ls->async_lock);
39 gdlm_do_lock(lp);
40 spin_lock(&ls->async_lock);
41 }
42 spin_unlock(&ls->async_lock);
43 }
44
45 return 0;
46 }
47
gdlm_init_threads(struct gdlm_ls * ls)48 int gdlm_init_threads(struct gdlm_ls *ls)
49 {
50 struct task_struct *p;
51 int error;
52
53 p = kthread_run(gdlm_thread, ls, "lock_dlm");
54 error = IS_ERR(p);
55 if (error) {
56 log_error("can't start lock_dlm thread %d", error);
57 return error;
58 }
59 ls->thread = p;
60
61 return 0;
62 }
63
gdlm_release_threads(struct gdlm_ls * ls)64 void gdlm_release_threads(struct gdlm_ls *ls)
65 {
66 kthread_stop(ls->thread);
67 }
68
69