为什么FUSE似乎锁定了所有线程?

我选择了fuse hello.c并修改了底部以显示我正在谈论的内容。在我的应用程序，我需要做的事情后，我的保险丝FS是可用的。我还需要IPC的另一个线程，并保持某些东西是最新的。因为fuse_main似乎没有返回，我把它扔到它自己的线程中。

当我注释掉fuse_main时，控制台显示打印的A和B。然而，如果我不注释出fuse_main(这是在一个不同的线程)，只有a被打印。保险丝是如何停止我的主线程，我如何运行代码后保险丝做它的事情?

#define FUSE_USE_VERSION 26
#include <fuse.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
static const char *hello_str = "Hello World!n";
static const char *hello_path = "/hello";
static int hello_getattr(const char *path, struct stat *stbuf)
{
    int res = 0;
    memset(stbuf, 0, sizeof(struct stat));
    if (strcmp(path, "/") == 0) {
        stbuf->st_mode = S_IFDIR | 0755;
        stbuf->st_nlink = 2;
    } else if (strcmp(path, hello_path) == 0) {
        stbuf->st_mode = S_IFREG | 0444;
        stbuf->st_nlink = 1;
        stbuf->st_size = strlen(hello_str);
    } else
        res = -ENOENT;
    return res;
}
static int hello_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
             off_t offset, struct fuse_file_info *fi)
{
    (void) offset;
    (void) fi;
    if (strcmp(path, "/") != 0)
        return -ENOENT;
    filler(buf, ".", NULL, 0);
    filler(buf, "..", NULL, 0);
    filler(buf, hello_path + 1, NULL, 0);
    return 0;
}
static int hello_open(const char *path, struct fuse_file_info *fi)
{
    if (strcmp(path, hello_path) != 0)
        return -ENOENT;
    if ((fi->flags & 3) != O_RDONLY)
        return -EACCES;
    return 0;
}
static int hello_read(const char *path, char *buf, size_t size, off_t offset,
              struct fuse_file_info *fi)
{
    size_t len;
    (void) fi;
    if(strcmp(path, hello_path) != 0)
        return -ENOENT;
    len = strlen(hello_str);
    if (offset < len) {
        if (offset + size > len)
            size = len - offset;
        memcpy(buf, hello_str + offset, size);
    } else
        size = 0;
    return size;
}
static struct fuse_operations hello_oper;
//modification starts below this line
#include<thread>
#include<unistd.h>
int main(int argc, char *argv[])
{
    std::thread t([&]{
        hello_oper.getattr  = hello_getattr;
        hello_oper.readdir  = hello_readdir;
        hello_oper.open     = hello_open;
        hello_oper.read     = hello_read;
        return fuse_main(argc, argv, &hello_oper, NULL);
    });
    printf("An");
    sleep(5);
    printf("Bn");
    t.join();
}