致命错误：linux/kthread.h：没有终止此类文件或目录编译

Question

我试图熟悉kthread，并编写了一个非常简单的程序来用C语言测试它，指导如下：http://tuxthink.blogspot.com/2011/02/kernel-thread-creation-1.html.我在MacOSX上的威睿运行Ubuntu。

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include "cycle.h"
#include <linux/kthread.h>
#include <linux/sched.h>

int main(){
    static struct task_struct *kthread;

    thread1 = kthread_create(thread_fn, NULL, "thread1");
    wake_up_process(thread1);
    kthread_stop(thread1);

    return 0;
}

当我试图使用gcc (gcc test5.c -o test5.out)编译这个文件时，我得到“致命错误:linux/kthread.h:没有这样的文件或目录编译终止。”

我去/usr/include/linux/里面找的时候没有kthread.h文件，所以看起来很合理。当我搜索kthread.h时，我在/usr/src/Linux-headers-3 . 2 . 0-31/include/Linux中找到了一个，在/usr/src/Linux-headers-3 . 2 . 0-29/include/Linux中也找到了一个，但是在我尝试将其中一个复制到/usr/include/linux/中后，我总是得到错误消息:

In file included from /usr/include/linux/kthread.h:4:0,
             from test5.c:5:
/usr/include/linux/err.h:22:35: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’     before ‘ERR_PTR’
/usr/include/linux/err.h:27:33: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘PTR_ERR’
/usr/include/linux/err.h:32:33: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’     before ‘IS_ERR’
/usr/include/linux/err.h:37:33: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘IS_ERR_OR_NULL’
/usr/include/linux/err.h:49:35: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘ERR_CAST’
/usr/include/linux/err.h:55:32: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘PTR_RET’
In file included from test5.c:5:0:
/usr/include/linux/kthread.h:7:10: error: expected declaration specifiers or ‘...’ before numeric constant
/usr/include/linux/kthread.h:7:13: error: expected declaration specifiers or ‘...’ before numeric constant
/usr/include/linux/kthread.h:58:2: error: unknown type name ‘spinlock_t’
/usr/include/linux/kthread.h:59:19: error: field ‘work_list’ has incomplete type
/usr/include/linux/kthread.h:64:19: error: field ‘node’ has incomplete type
/usr/include/linux/kthread.h:66:2: error: unknown type name ‘wait_queue_head_t’
/usr/include/linux/kthread.h:67:2: error: unknown type name ‘atomic_t’
/usr/include/linux/kthread.h:128:1: error: unknown type name ‘bool’
test5.c: In function ‘main’:
test5.c:11:2: error: ‘thread1’ undeclared (first use in this function)
test5.c:11:2: note: each undeclared identifier is reported only once for each function it appears in
test5.c:11:12: error: ‘thread_fn’ undeclared (first use in this function)

任何关于如何解决这个问题的想法都将非常感谢！

Answer 1

这些是用于内核空间的内核线程，而不是用户空间线程！您应该使用适当的Makefile将代码更改为内核模块，或者将pthreads用于用户空间线程。也许您应该从HelloWorld内核模块开始