单线程会导致死锁你知道吗

#include<pthread.h>
#include<string.h>
#include<errno.h>
#include<stdio.h>
#include<unistd.h> 
pthread_mutex_t mutex;
int main()
{
    pthread_mutex_init(&mutex,NULL);
    printf("mutex init\n");
    pthread_mutex_lock(&mutex);
    printf("mutex lock#1\n");
    pthread_mutex_lock(&mutex);
    printf("mutex lock#2\n");
    pthread_mutex_unlock(&mutex);
    pthread_mutex_unlock(&mutex);
    pthread_mutex_destroy(&mutex);
    return 0; 
}

int test_function(void)
{
  //lock
  do_something()
  if(x) return -1
  //unlock
}

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <pthread.h>
pthread_mutex_t g_mutex_lock;
pthread_mutex_t g_mutex_lock2;
void *func1(void* args)
{
    printf("%s(),LINE=%d\n",__FUNCTION__,__LINE__);
    pthread_mutex_lock(&g_mutex_lock);
    sleep(1);
    pthread_mutex_lock(&g_mutex_lock2);
    printf("%s(),LINE=%d\n",__FUNCTION__,__LINE__);
    pthread_mutex_unlock(&g_mutex_lock);
    pthread_mutex_unlock(&g_mutex_lock2);
    return NULL;
}
void *func2(void* args)
{
    printf("%s(),LINE=%d\n",__FUNCTION__,__LINE__);
    pthread_mutex_lock(&g_mutex_lock2);
    sleep(1);
    pthread_mutex_lock(&g_mutex_lock);
    printf("%s(),LINE=%d\n",__FUNCTION__,__LINE__);
    pthread_mutex_unlock(&g_mutex_lock2);
    return NULL;
}
int main(void)
{
    int ret;
    pthread_t thread_1;
    pthread_t thread_2;
    printf("%s(),LINE=%d\n",__FUNCTION__,__LINE__);
    ret = pthread_mutex_init(&g_mutex_lock, NULL);
    if (ret != 0) {
        printf("mutex init failed\n");
        return -1;
    }
    ret = pthread_mutex_init(&g_mutex_lock2, NULL);
    if (ret != 0) {
        printf("mutex2 init failed\n");
        return -1;
    }
    pthread_create(&thread_1, NULL, func1, NULL);
    pthread_create(&thread_2, NULL, func2, NULL);
    pthread_join(thread_1, NULL);
    pthread_join(thread_2, NULL);
    pthread_mutex_destroy(&g_mutex_lock);
    pthread_mutex_destroy(&g_mutex_lock2);
    printf("%s(),LINE=%d\n",__FUNCTION__,__LINE__);
    return 0;
}