#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>

#define MIN_SLEEP_TIME 10
#define MAX_SLEEP_TIME 100

void random_sleep()
{
    int sleep_time = (rand() % (MAX_SLEEP_TIME - MIN_SLEEP_TIME + 1)) + MIN_SLEEP_TIME;
    usleep(sleep_time * 1000);
}

pthread_mutex_t mylock = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t rtnl_mutex = PTHREAD_MUTEX_INITIALIZER;

int is_rtnl_locked = 0;
int mylock_locked = 0;

void rtnl_lock()
{
    pthread_mutex_lock(&rtnl_mutex);
    is_rtnl_locked = 1;
}

void rtnl_unlock()
{
    is_rtnl_locked = 0;
    pthread_mutex_unlock(&rtnl_mutex);
}

void mylock_lock()
{
    pthread_mutex_lock(&mylock);
    mylock_locked = 1;
}

void mylock_unlock()
{
    mylock_locked = 0;
    pthread_mutex_unlock(&mylock);
}

int is_mylock_locked()
{
    return mylock_locked;
}

void wifi_open()
{
    if (is_mylock_locked() && is_rtnl_locked)
    {
        rtnl_unlock();
        printf("main wireless device up\n");
        sleep(1);
        rtnl_lock();
    }
}

void devinet_ioctl(int iswireless)
{
    if (iswireless)
    {
        mylock_lock();
    }
    rtnl_lock();

    if (iswireless)
    {
        wifi_open();
    }

    rtnl_unlock();

    if (iswireless)
    {
        mylock_unlock();
    }
}

void wireless_process_ioctl()
{
    mylock_lock();
    rtnl_lock();

    wifi_open();

    rtnl_unlock();
    mylock_unlock();
}

void *wireless_ioctl(void *arg)
{
    int count = 0;
    while (1)
    {
        wireless_process_ioctl();
        printf("[1] wireless_ioctl, %d\n", count++);
        random_sleep();
    }
    return NULL;
}

void *wireless_ifconfig_up(void *arg)
{
    int count = 0;
    while (1)
    {
        devinet_ioctl(1);
        printf("[2] wireless_ifconfig_up, %d\n", count++);
        random_sleep();
    }
    return NULL;
}

void *other_ifconfig_up(void *arg)
{
    int count = 0;
    while (1)
    {
        devinet_ioctl(0);
        printf("[3] other_ifconfig_up, %d\n", count++);
        random_sleep();
    }
    return NULL;
}

int main(int argc, char *argv[])
{
    srand(time(0)); // 初始化隨機種子
    pthread_t th;
    pthread_create(&th, NULL, wireless_ifconfig_up, NULL);
    pthread_create(&th, NULL, other_ifconfig_up, NULL);
    wireless_ioctl(NULL);
    return 0;
}

ifconfig Call Trace:
[<80016034>] show_stack+0x88/0xa4
[<808795a8>] dump_stack+0x6c/0x8c
[<80538218>] MtCmdEfusBufferModeSet+0x70/0x2a4
[<80490db0>] NICReadEEPROMParameters+0x1a8/0xa74
[<804a889c>] WfEPROMSysInit+0x3c/0xe0
[<803f9f1c>] WfEPROMInit+0x18/0x64
[<803fa030>] WfInit+0xa8/0x20c
[<804ac01c>] mt_wifi_init+0x324/0x600
[<805fa358>] mt_wifi_open+0x110/0x2ac
[<805fa54c>] virtual_if_init_handler+0x58/0xdc
[<80401b74>] RTMP_COM_IoctlHandle+0x604/0x1684
[<805f9e78>] main_virtual_if_open+0xb8/0x1ec
[<806f7d2c>] __dev_open+0xec/0x15c
[<806f804c>] __dev_change_flags+0xa0/0x184
[<806f815c>] dev_change_flags+0x24/0x68
[<807aa6e8>] devinet_ioctl+0x808/0x8a0
[<806d75b4>] sock_ioctl+0xa4/0x374
[<801144f4>] do_vfs_ioctl+0xa0/0x6d4
[<80114bcc>] SyS_ioctl+0xa4/0xb8
[<8001c464>] handle_sys+0x124/0x144


iwpriv Call Trace:
[<80016034>] show_stack+0x88/0xa4
[<808795a8>] dump_stack+0x6c/0x8c
[<80374598>] rt28xx_ap_ioctl+0x538/0xa10
[<805f9a30>] rt28xx_ioctl+0x60/0xb0
[<80871e14>] wext_handle_ioctl+0x200/0x28c
[<8070d61c>] dev_ioctl+0x104/0x698
[<801144f4>] do_vfs_ioctl+0xa0/0x6d4
[<80114bcc>] SyS_ioctl+0xa4/0xb8
[<8001c464>] handle_sys+0x124/0x144