您的位置：首页 > 编程语言

【UnixC多线程\进程】多线程和多进程C代码及测试截图

2014-11-09 16:28 288 查看

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

//线程1用来求1~n之间的素数
void *MyThread1(void)
{
int n;
int h=0,leap=1,k,m,i;
printf("[pid_prime]input the value of n:\n");//输入n的值
scanf("%d",&n);
printf("the prime number between 1~%d is:\n",n);
for(m=2;m<=n;m++)
{
// k=sqrt(m+1);
for(i=2;i<=m/2;i++)
{
if(m%i==0)
{
leap=0;break;
}
}
if(leap)
{
printf("%4d",m);
h++;
if(h%10==0)
printf("\n");
}
leap=1;
}
printf("\nthread1 exit!\n");//线程1退出
pthread_exit(0);
}

//线程2用来求fib序列
void *MyThread2(void)
{
int fib0=0,fib1=1,fib2,i,N;
printf("[pid_fib]input the value of N:\n");//输入N的值
scanf("%d",&N);
printf("the fib sequence as following:\n");
for(i=0;i<N;i++)
{
if(i==0)
{
printf("0 ");
}
else if(i==1)
{
printf("1 ");
}
else
{
fib2=fib0+fib1;
printf("%d ",fib2);
fib0=fib1;
fib1=fib2;
}
}
printf("\nthread2 exit!\n");//线程2退出
pthread_exit(0);
}

//线程3用来求闰年
void *MyThread3(void)
{
int year=0;
printf("[pid_run]input the value of year:\n");//输入n的值
scanf("%d",&year);
if(year%4!=0)
{
printf("%d is not a 闰年\n",year);
}
else
{
if(year%100!=0) printf("%d is a 闰年\n",year);
else
{
if(year%400==0) printf("%d is a 闰年\n",year);
else printf("%d is not a 闰年\n",year);
}
}
printf("\nthread3 exit!\n");//线程3退出
pthread_exit(0);
}

//线程4用来求回文
void *MyThread4(void)
{
int num=0;
printf("[pid_palid]input the value of num:\n");//输入num的值
scanf("%d",&num);
int a1=num/10000;
int a2=num/1000%10;
int a3=num/10%10;
int a4=num%10;
if(a1==a4 && a2==a3) printf("number %d is a palindome\n",num);
else printf("number %d is not a palindome\n",num);
printf("\nthread4 exit!\n");//线程4退出
pthread_exit(0);
}

//主线程来创建两个线程
int mainthread()
{
int ret1=0,ret2=0,ret3=0,ret4=0;
pthread_t id1,id2,id3,id4;//定义两个线程id

//调用pthread_create()函数来创建线程1
ret1=pthread_create(&id1,NULL,(void*)MyThread1,NULL);
//ret1=0表示创建成功，否则表示出错
if(ret1)
{
//如果出错就打印错误信息
printf("Create pthread error!\n");
return 1;
}

//调用pthread_create()函数来创建线程2
ret2=pthread_create(&id2,NULL,(void*)MyThread2,NULL);
//ret2=0表示创建成功，否则表示出错
if(ret2)
{
//如果出错就打印错误信息
printf("Create pthread error!\n");
return 1;
}

//调用pthread_create()函数来创建线程3
ret3=pthread_create(&id3,NULL,(void*)MyThread3,NULL);
//ret3=0表示创建成功，否则表示出错
if(ret3)
{
//如果出错就打印错误信息
printf("Create pthread error!\n");
return 1;
}

//调用pthread_create()函数来创建线程4
ret4=pthread_create(&id4,NULL,(void*)MyThread4,NULL);
//ret4=0表示创建成功，否则表示出错
if(ret4)
{
//如果出错就打印错误信息
printf("Create pthread error!\n");
return 1;
}

pthread_join(id1,NULL);//主线程等待线程1结束
pthread_join(id2,NULL);//主线程等待线程2结束
pthread_join(id3,NULL);//主线程等待线程3结束
pthread_join(id4,NULL);//主线程等待线程4结束
printf("main thread exit!\n");//主线程退出
return 0;
}

//被4号进程创建的两个子进程分别调用下面这个函数来完成不同的任务
//CD：现在是仨进程了
void childfun(int i)
{
switch(i)
{

case 5 : printf("This is NO.5 process,ID is %d,parent ID is %d,will create 2 thread\n",getpid(),getppid());
mainthread();//调用线程创建的函数
break;
case 6 : printf("This is NO.6 process,ID is %d,parent ID is %d,will execute ./proc2 \n",getpid(),getppid());
//用execl来执行用户写的可执行文件proc2
execl("proc2","./proc2",NULL);
break;
case 7 : printf("This is NO.7 process,ID is %d,parent ID is %d,will execute ./proc2 \n",getpid(),getppid());

break;
}

exit(0);

}

int createprocess()  //4号进程来创建两个子进程
{
int i;
for(i=5;i<=7;i++)
{
pid_t child;
child=fork();
//创建失败
if(child==-1)
{
printf("Error happened in fork function!\n");
return 0;
}
//子进程的返回值为0,
else if(child==0)
{
childfun(i);//调用这个函数来分别让进程执行不同的程序
}
}
for(i=0;i<3;i++)
{
//进程等待其子进程的退出
pid_t cpid=wait(NULL);
printf("the process %d exit\n",cpid);
}
return 0;
}

//父进程创建的两个进程分别调用下面函数来完成不同的任务
//CD:现在是三个进程了，多了个2
void fun(int i)
{
switch(i)
{
case 2 : printf("this is NO.2 process,ID is %d,parent ID is %d,will execute command: ls -l:\n",getpid(),getppid());
// NAME.ID.PID is ok
break;
case 3 : printf("this is NO.3 process,ID is %d,parent ID is %d,will execute command: ls -l:\n",getpid(),getppid());
//3号进程调用execl函数来执行ls -l命令
execl("/bin/ls","ls","-l",NULL);
break;
case 4 : printf("I am NO.4 process,ID is %d,parent ID is %d,will create 2 process\n",getpid(),getppid());
createprocess();//4号进程调用这个函数来创建两个子进程
break;
}

exit(0);
}

int main()
{
int i;
for(i=2;i<=4;i++)
{
pid_t child;
child=fork();//调用fork函数来创建子进程
//创建失败
if(child==-1)
{
printf("Error happened in fork function!\n");
return 0;
}
//子进程的返回值为0,
else if(child==0)
{
printf("process ID is %d:\n",getpid());
fun(i);
}
}
for(i=0;i<3;i++)
{
//父进程等待子进程的退出
pid_t cpid=wait(NULL);
printf("The process %d exit\n",cpid);
}
//最后父进程退出
printf("The NO.1 parent process ID is %d exit\n",getpid());
return 0;
}

Terminal 调试过程_Logcat

cqu@cqu:~$ ls
cd                Linux  公共的  视频  文档  音乐
examples.desktop  lyh    模板    图片  下载  桌面
cqu@cqu:~$ cd cd
cqu@cqu:~/cd$ ls
exp2  exp2.c  proc2  proc2.c  process  process.c
cqu@cqu:~/cd$ gcc exp2.c -lpthread -o exp2
cqu@cqu:~/cd$ ./exp2
process ID is 2713:
this is NO.2 process,ID is 2713,parent ID is 2712,will execute command: ls -l:
The process 2713 exit
process ID is 2714:
this is NO.3 process,ID is 2714,parent ID is 2712,will execute command: ls -l:
总计 52
-rwxr-xr-x 1 cqu cqu 11935 2014-11-09 16:17 exp2
-rwxr--r-- 1 cqu cqu  6390 2014-11-09 16:17 exp2.c
-rwxrw-rw- 1 cqu cqu  7159 2014-11-09 15:04 proc2
-rwxrw-rw- 1 cqu cqu    75 2014-11-09 15:04 proc2.c
-rwxrw-rw- 1 cqu cqu 11890 2014-11-09 15:04 process
-rwxrw-rw- 1 cqu cqu  4466 2014-11-09 15:04 process.c
The process 2714 exit
process ID is 2715:
I am NO.4 process,ID is 2715,parent ID is 2712,will create 2 process
This is NO.6 process,ID is 2717,parent ID is 2715,will execute ./proc2
Hello world!
the process 2717 exit
This is NO.7 process,ID is 2718,parent ID is 2715,will execute ./proc2
the process 2718 exit
This is NO.5 process,ID is 2716,parent ID is 2715,will create 2 thread
[pid_fib]input the value of N:
[pid_run]input the value of year:
[pid_prime]input the value of n:
[pid_palid]input the value of num:
5
the fib sequence as following:
0 1 1 2 3
thread2 exit!
1234
1234 is not a 闰年

thread3 exit!
15
the prime number between 1~15 is:
2   3   5   7  11  13
thread1 exit!
12321
number 12321 is a palindome

thread4 exit!
main thread exit!
the process 2716 exit
The process 2715 exit
The NO.1 parent process ID is 2712 exit