| /* |
| 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 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_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL); |
| pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, 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; |
| } |
| |
| pthread_mutex_lock(&w->lock); |
| 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); |
| } |
| |
| /* Wait for cancellation */ |
| if (!is_mainthread) |
| pause(); |
| |
| return NULL; |
| } |
| |
| static int start_thread(struct fuse_worker *w, pthread_t *thread_id) |
| { |
| int res = pthread_create(thread_id, NULL, do_work, w); |
| if (res != 0) { |
| fprintf(stderr, "fuse: error creating thread: %s\n", strerror(res)); |
| return -1; |
| } |
| |
| pthread_detach(*thread_id); |
| 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]); |
| pthread_mutex_unlock(&w->lock); |
| pthread_mutex_destroy(&w->lock); |
| err = w->error; |
| fuse_chan_destroy(w->ch); |
| free(w); |
| fuse_session_reset(se); |
| return err; |
| } |