1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
/*
FUSE: Filesystem in Userspace
Copyright (C) 2001-2006 Miklos Szeredi <miklos@szeredi.hu>
This program can be distributed under the terms of the GNU LGPL.
See the file COPYING.LIB.
*/
#include "fuse_lowlevel.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#include <sys/time.h>
#define FUSE_MAX_WORKERS 10
struct fuse_worker {
pthread_mutex_t lock;
int numworker;
int numavail;
struct fuse_session *se;
struct fuse_chan *ch;
struct fuse_chan *prevch;
pthread_t threads[FUSE_MAX_WORKERS];
pthread_t main_thread;
int exit;
int error;
};
#ifndef USE_UCLIBC
#define mutex_init(mut) pthread_mutex_init(mut, NULL)
#else
static void mutex_init(pthread_mutex_t *mut)
{
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ADAPTIVE_NP);
pthread_mutex_init(mut, &attr);
pthread_mutexattr_destroy(&attr);
}
#endif
static int fuse_loop_mt_send(struct fuse_chan *ch, const struct iovec iov[],
size_t count)
{
struct fuse_worker *w = (struct fuse_worker *) fuse_chan_data(ch);
pthread_mutex_lock(&w->lock);
w->numavail ++;
pthread_mutex_unlock(&w->lock);
return fuse_chan_send(w->prevch, iov, count);
}
static int start_thread(struct fuse_worker *w, pthread_t *thread_id);
static void *do_work(void *data)
{
struct fuse_worker *w = (struct fuse_worker *) data;
size_t bufsize = fuse_chan_bufsize(w->prevch);
char *buf = (char *) malloc(bufsize);
if (!buf) {
fprintf(stderr, "fuse: failed to allocate read buffer\n");
fuse_session_exit(w->se);
w->error = -1;
return NULL;
}
pthread_cleanup_push(free, buf);
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL);
while (!fuse_session_exited(w->se)) {
int res = fuse_chan_receive(w->prevch, buf, bufsize);
if (!res)
continue;
if (res == -1) {
fuse_session_exit(w->se);
w->error = -1;
break;
}
pthread_mutex_lock(&w->lock);
if (w->exit) {
pthread_mutex_unlock(&w->lock);
break;
}
w->numavail--;
if (w->numavail == 0 && w->numworker < FUSE_MAX_WORKERS) {
if (w->numworker < FUSE_MAX_WORKERS) {
/* FIXME: threads should be stored in a list instead
of an array */
int start_res;
pthread_t *thread_id = &w->threads[w->numworker];
w->numavail ++;
w->numworker ++;
start_res = start_thread(w, thread_id);
if (start_res == -1)
w->numavail --;
}
}
pthread_mutex_unlock(&w->lock);
fuse_session_process(w->se, buf, res, w->ch);
}
pthread_cleanup_pop(1);
if (pthread_self() != w->main_thread) {
pthread_kill(w->main_thread, SIGTERM);
pause();
}
return NULL;
}
static int start_thread(struct fuse_worker *w, pthread_t *thread_id)
{
sigset_t oldset;
sigset_t newset;
int res;
/* Disallow signal reception in worker threads */
sigemptyset(&newset);
sigaddset(&newset, SIGTERM);
sigaddset(&newset, SIGINT);
sigaddset(&newset, SIGHUP);
sigaddset(&newset, SIGQUIT);
pthread_sigmask(SIG_BLOCK, &newset, &oldset);
res = pthread_create(thread_id, NULL, do_work, w);
pthread_sigmask(SIG_SETMASK, &oldset, NULL);
if (res != 0) {
fprintf(stderr, "fuse: error creating thread: %s\n", strerror(res));
return -1;
}
return 0;
}
int fuse_session_loop_mt(struct fuse_session *se)
{
int i;
int err;
struct fuse_worker *w;
struct fuse_chan_ops cop = {
.send = fuse_loop_mt_send,
};
w = (struct fuse_worker *) malloc(sizeof(struct fuse_worker));
if (w == NULL) {
fprintf(stderr, "fuse: failed to allocate worker structure\n");
return -1;
}
memset(w, 0, sizeof(struct fuse_worker));
w->se = se;
w->prevch = fuse_session_next_chan(se, NULL);
w->ch = fuse_chan_new(&cop, -1, fuse_chan_bufsize(w->prevch), w);
if (w->ch == NULL) {
free(w);
return -1;
}
w->error = 0;
w->numworker = 1;
w->numavail = 1;
w->main_thread = pthread_self();
mutex_init(&w->lock);
do_work(w);
pthread_mutex_lock(&w->lock);
for (i = 1; i < w->numworker; i++)
pthread_cancel(w->threads[i]);
w->exit = 1;
pthread_mutex_unlock(&w->lock);
for (i = 1; i < w->numworker; i++)
pthread_join(w->threads[i], NULL);
pthread_mutex_destroy(&w->lock);
err = w->error;
fuse_chan_destroy(w->ch);
free(w);
fuse_session_reset(se);
return err;
}
|
