一、程序的建立和切換

1.1 原始碼

#include <unistd.h>
#include <stdio.h>
int main()
{
	pid_t son_pid, daughter_pid;
	int count = 1;
	son_pid = fork();
	if (son_pid == 0)
	{
		count++;
		printf("I am son, count=%d\n", count);
	}
	else
	{
		daughter_pid = fork();
		if (daughter_pid == 0)
		{
			count++;
			printf("I am daughter, count=%d\n", count);
		}
		else
		{
			count++;
			printf("I am father, count=%d\n", count);
		}
	}
	return 0;
}

 

1.2 執行結果截圖

二、執行緒的建立和切換

2.1 原始碼

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

void *daughter(void *num)
{
	int* a = (int*)num;
	*a += 1;
	printf("I am daughter, count=%d\n", *a);
}

void *son(void *num)
{
	int* a = (int*)num;
	*a += 1;
	printf("I am son, count=%d\n", *a);
}

int main(void)
{
	pthread_t son_tid, daughter_tid;
	int count = 1;
	pthread_create(&son_tid, NULL, son, &count);
	pthread_create(&daughter_tid, NULL, daughter, &count);
	count++;
	printf("I am parent, count=%d\n", count);
	pthread_join(son_tid, NULL);
	pthread_join(daughter_tid, NULL);
	return 0;
}

 

2.2 執行結果截圖