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/*
FUSE: Filesystem in Userspace
Copyright (C) 2001-2005 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];
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;
int is_mainthread = (w->numworker == 1);
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);
/* Wait for cancellation */
if (!is_mainthread)
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, 0, w);
if (w->ch == NULL) {
free(w);
return -1;
}
w->error = 0;
w->numworker = 1;
w->numavail = 1;
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;
}
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