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/*
FUSE: Filesystem in Userspace
Copyright (C) 2001 Miklos Szeredi (mszeredi@inf.bme.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 <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 void 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;
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->lock);
if (f->numworker < FUSE_MAX_WORKERS) {
pthread_t *thread_id = &w->threads[f->numworker];
f->numavail ++;
f->numworker ++;
pthread_mutex_unlock(&f->lock);
start_thread(w, thread_id);
} else
pthread_mutex_unlock(&f->lock);
}
w->proc(w->f, cmd, w->data);
}
return NULL;
}
static void 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, "Error creating thread: %s\n", strerror(res));
exit(1);
}
pthread_detach(*thread_id);
}
static struct fuse_context *mt_getcontext(struct fuse *f)
{
struct fuse_context *ctx;
ctx = (struct fuse_context *) pthread_getspecific(f->context_key);
if (ctx == NULL) {
ctx = (struct fuse_context *) malloc(sizeof(struct fuse_context));
pthread_setspecific(f->context_key, ctx);
}
return ctx;
}
static void mt_freecontext(void *data)
{
free(data);
}
void __fuse_loop_mt(struct fuse *f, fuse_processor_t proc, void *data)
{
struct fuse_worker *w;
int res;
int i;
w = malloc(sizeof(struct fuse_worker));
memset(w, 0, sizeof(struct fuse_worker));
w->f = f;
w->data = data;
w->proc = proc;
f->numworker = 1;
res = pthread_key_create(&f->context_key, mt_freecontext);
if (res != 0) {
fprintf(stderr, "Failed to create thread specific key\n");
exit(1);
}
f->getcontext = mt_getcontext;
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);
}
void fuse_loop_mt(struct fuse *f)
{
if (f == NULL)
return;
__fuse_loop_mt(f, (fuse_processor_t) __fuse_process_cmd, NULL);
}
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