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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_i.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 {
struct fuse *f;
pthread_t threads[FUSE_MAX_WORKERS];
void *data;
fuse_processor_t proc;
};
static pthread_key_t context_key;
static pthread_mutex_t context_lock = PTHREAD_MUTEX_INITIALIZER;
static int context_ref;
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;
struct fuse *f = w->f;
struct fuse_context *ctx;
int is_mainthread = (f->numworker == 1);
ctx = (struct fuse_context *) malloc(sizeof(struct fuse_context));
if (ctx == NULL) {
fprintf(stderr, "fuse: failed to allocate fuse context\n");
pthread_mutex_lock(&f->worker_lock);
f->numavail --;
pthread_mutex_unlock(&f->worker_lock);
return NULL;
}
pthread_setspecific(context_key, ctx);
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
while (1) {
struct fuse_cmd *cmd;
if (fuse_exited(f))
break;
cmd = fuse_read_cmd(w->f);
if (cmd == NULL)
continue;
if (f->numavail == 0 && f->numworker < FUSE_MAX_WORKERS) {
pthread_mutex_lock(&f->worker_lock);
if (f->numworker < FUSE_MAX_WORKERS) {
/* FIXME: threads should be stored in a list instead
of an array */
int res;
pthread_t *thread_id = &w->threads[f->numworker];
f->numavail ++;
f->numworker ++;
pthread_mutex_unlock(&f->worker_lock);
res = start_thread(w, thread_id);
if (res == -1) {
pthread_mutex_lock(&f->worker_lock);
f->numavail --;
pthread_mutex_unlock(&f->worker_lock);
}
} else
pthread_mutex_unlock(&f->worker_lock);
}
w->proc(w->f, cmd, w->data);
}
/* 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 */
sigfillset(&newset);
pthread_sigmask(SIG_SETMASK, &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;
}
pthread_detach(*thread_id);
return 0;
}
static struct fuse_context *mt_getcontext(void)
{
struct fuse_context *ctx =
(struct fuse_context *) pthread_getspecific(context_key);
if (ctx == NULL)
fprintf(stderr, "fuse: no thread specific data for this thread\n");
return ctx;
}
static void mt_freecontext(void *data)
{
free(data);
}
static int mt_create_context_key()
{
int err = 0;
pthread_mutex_lock(&context_lock);
if (!context_ref) {
err = pthread_key_create(&context_key, mt_freecontext);
if (err)
fprintf(stderr, "fuse: failed to create thread specific key: %s\n",
strerror(err));
else
fuse_set_getcontext_func(mt_getcontext);
}
if (!err)
context_ref ++;
pthread_mutex_unlock(&context_lock);
return err;
}
static void mt_delete_context_key()
{
pthread_mutex_lock(&context_lock);
context_ref--;
if (!context_ref) {
fuse_set_getcontext_func(NULL);
pthread_key_delete(context_key);
}
pthread_mutex_unlock(&context_lock);
}
int fuse_loop_mt_proc(struct fuse *f, fuse_processor_t proc, void *data)
{
struct fuse_worker *w;
int i;
w = 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->f = f;
w->data = data;
w->proc = proc;
if (mt_create_context_key() != 0) {
free(w);
return -1;
}
f->numworker = 1;
do_work(w);
pthread_mutex_lock(&f->lock);
for (i = 1; i < f->numworker; i++)
pthread_cancel(w->threads[i]);
pthread_mutex_unlock(&f->lock);
mt_delete_context_key();
free(w);
f->exited = 0;
return 0;
}
int fuse_loop_mt(struct fuse *f)
{
if (f == NULL)
return -1;
return fuse_loop_mt_proc(f, (fuse_processor_t) fuse_process_cmd, NULL);
}
__asm__(".symver fuse_loop_mt_proc,__fuse_loop_mt@");
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