帮我写个LP55S69的SMP的小demo例程
时间: 2023-02-19 09:51:38 浏览: 90
这是一个示例代码,它利用LP5569芯片实现一个简单的多线程(SMP)例程:
```
#include <pthread.h>
#include <unistd.h>
#include <stdio.h>
#define THREAD_NUM 3
void *thread_function(void *thread_id)
{
int tid = (int)thread_id;
printf("Thread %d is running\n", tid);
sleep(1);
printf("Thread %d is done\n", tid);
pthread_exit(NULL);
}
int main(void)
{
pthread_t threads[THREAD_NUM];
int i;
for (i = 0; i < THREAD_NUM; i++)
{
printf("Creating thread %d\n", i);
int ret = pthread_create(&threads[i], NULL, thread_function, (void *)i);
if (ret)
{
printf("Error: pthread_create() returned %d\n", ret);
return -1;
}
}
for (i = 0; i < THREAD_NUM; i++)
{
pthread_join(threads[i], NULL);
}
printf("All threads are done\n");
return 0;
}
```
这个代码创建了3个线程,每个线程都会输出"Thread X is running"和"Thread X is done"的消息,其中X是线程ID。每个线程输出完消息后,线程就结束了。在所有线程结束后,主线程会输出"All threads are done"的消息。
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