Commit | Line | Data |
---|---|---|
1366c37e MW |
1 | #include <linux/rcupdate.h> |
2 | #include <pthread.h> | |
3 | #include <stdio.h> | |
4 | #include <assert.h> | |
5 | ||
6 | static pthread_mutex_t rculock = PTHREAD_MUTEX_INITIALIZER; | |
7 | static struct rcu_head *rcuhead_global = NULL; | |
8 | static __thread int nr_rcuhead = 0; | |
9 | static __thread struct rcu_head *rcuhead = NULL; | |
10 | static __thread struct rcu_head *rcutail = NULL; | |
11 | ||
12 | static pthread_cond_t rcu_worker_cond = PTHREAD_COND_INITIALIZER; | |
13 | ||
14 | /* switch to urcu implementation when it is merged. */ | |
15 | void call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *head)) | |
16 | { | |
17 | head->func = func; | |
18 | head->next = rcuhead; | |
19 | rcuhead = head; | |
20 | if (!rcutail) | |
21 | rcutail = head; | |
22 | nr_rcuhead++; | |
23 | if (nr_rcuhead >= 1000) { | |
24 | int signal = 0; | |
25 | ||
26 | pthread_mutex_lock(&rculock); | |
27 | if (!rcuhead_global) | |
28 | signal = 1; | |
29 | rcutail->next = rcuhead_global; | |
30 | rcuhead_global = head; | |
31 | pthread_mutex_unlock(&rculock); | |
32 | ||
33 | nr_rcuhead = 0; | |
34 | rcuhead = NULL; | |
35 | rcutail = NULL; | |
36 | ||
37 | if (signal) { | |
38 | pthread_cond_signal(&rcu_worker_cond); | |
39 | } | |
40 | } | |
41 | } | |
42 | ||
43 | static void *rcu_worker(void *arg) | |
44 | { | |
45 | struct rcu_head *r; | |
46 | ||
47 | rcupdate_thread_init(); | |
48 | ||
49 | while (1) { | |
50 | pthread_mutex_lock(&rculock); | |
51 | while (!rcuhead_global) { | |
52 | pthread_cond_wait(&rcu_worker_cond, &rculock); | |
53 | } | |
54 | r = rcuhead_global; | |
55 | rcuhead_global = NULL; | |
56 | ||
57 | pthread_mutex_unlock(&rculock); | |
58 | ||
59 | synchronize_rcu(); | |
60 | ||
61 | while (r) { | |
62 | struct rcu_head *tmp = r->next; | |
63 | r->func(r); | |
64 | r = tmp; | |
65 | } | |
66 | } | |
67 | ||
68 | rcupdate_thread_exit(); | |
69 | ||
70 | return NULL; | |
71 | } | |
72 | ||
73 | static pthread_t worker_thread; | |
74 | void rcupdate_init(void) | |
75 | { | |
76 | pthread_create(&worker_thread, NULL, rcu_worker, NULL); | |
77 | } | |
78 | ||
79 | void rcupdate_thread_init(void) | |
80 | { | |
81 | rcu_register_thread(); | |
82 | } | |
83 | void rcupdate_thread_exit(void) | |
84 | { | |
85 | rcu_unregister_thread(); | |
86 | } |