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在linux系统中设计一个父进程,三个子进程(A,B,C)。子进程A,B同时被父进程启动来计算(不实现具体的计算任务,先用CPU空跑来代替)。进程A计算5分钟,而进程B计算8分钟。当进程A,B都计算完成后才能启动进程C,进程C计算3分钟。自己寻找前端的可视化方案,当进程在并发计算时,打开网页能够看到,那个进程当前正在计算,并且要可视化的显示计算的进度,还要看出各个进程之间的约束关系。
1.父进程fork出子进程A,B。A,B同时执行。进程A B内执行循环空跑CPU,利用gettimeofday()函数获取时间来控制执行时间。
2.定义全局变量标志进程A B状态,初始化为假,若A B执行完毕后,则子进程A B向主进程发送信号,主进程收到子进程A B完成的信号后调用相应函数改变表示A B状态的变量为真,当A B都完成后 ,主进程fork出子进程C,子进程的运行方法同进程A B。
3.可视化:利用浏览器进行可视化显示,则主进程为服务器,主进程通过管道与进程A B C进行通信,获取进程运行进度,通过浏览器发出请求,主进程收到请求后向浏览器发送进程运行情况。网页通过自动刷新不断更新数据。
#include <sys/socket.h>
#include <sys/un.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
#include <sys/time.h>
#define TRUE 0x01
#define FALSE 0x00
#define MAX 10
#define PORT 8080
char flagA=FALSE; //进程A完成标志
char flagB=FALSE; //进程B完成标志
int flagC=1; //进程C完成标志 1:未开始 2:已开始 3:已结束
int flagCount=0; //进程C建立标志
//进程A信号处理
void endofA(int sig)
{
if(sig==SIGUSR1)
{
flagA=TRUE;
printf("修改了A\n");
}
return;
}
//进程B信号处理
void endofB(int sig)
{
if(sig==SIGUSR2)
{
flagB=TRUE;
printf("修改了B\n");
}
return;
}
//进程C信号处理
void endofC(int sig)
{
if(sig==SIGINT)
{
flagB=3;
printf("修改了C\n");
}
return;
}
int main(int argc,char *argv[])
{
int fdA[2],n; //父进程与A进程通信管道
char stateA[50]="子进程A执行中";
char stateB[50]="子进程B执行中";
char stateC[50]="子进程B执行中";
char temp[5];
pipe(fdA);
int fdB[2]; //父进程与B进程通信管道
pipe(fdB);
int server_socket = socket(AF_INET, SOCK_STREAM, 0); //服务器socket
struct sockaddr_in server_addr; //服务器地址
memset(&server_addr, 0, sizeof(server_addr)); //清空服务器地址
server_addr.sin_family = AF_INET; //IPv4 网络协议的套接字类型
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
server_addr.sin_port = htons(PORT);
bind(server_socket, (struct sockaddr *)&server_addr, sizeof(server_addr));
pid_t pidA;
if((pidA=fork())<0)
printf("forkA fail");
if(pidA==0) //进程A
{
close(fdA[0]);
int runtime;
struct timeval start,end;
n=gettimeofday(&start, NULL);
gettimeofday(&end, NULL);
//空跑300秒,每3秒向管道内写入已运行时间
//采用网页显示,主进程与A之间有480个像素,故速度为1.6
while((runtime=(end.tv_sec-start.tv_sec))<=300)
{
sleep(3);
char timeA[20]={0};
double distanceA=1.6*runtime;
sprintf(timeA,"%.2f",distanceA);
gettimeofday(&end, NULL);
write(fdA[1],timeA,sizeof(timeA));
}
//向父进程发送信号
if(kill(getppid(),SIGUSR1)==-1)
{
printf("process A send fail");
exit(0);
}
}
else
{
pid_t pidB;
pidB=fork();
//B进程
if(pidB==0)
{
close(fdB[0]);
int runtimeB=0;
float distanceB=0;
struct timeval startB,endB;
n=gettimeofday(&startB, NULL);
gettimeofday(&endB, NULL);
//空跑480秒,每3秒向管道内写入已运行时间
//采用网页显示,主进程与A之间有480个像素,故速度为1
while((runtimeB=(endB.tv_sec-startB.tv_sec))<=480)
{
sleep(3);
char timeB[20]={0};
distanceB=1*runtimeB;
sprintf(timeB,"%.2f",distanceB);
gettimeofday(&endB, NULL);
write(fdB[1],timeB,sizeof(timeB));
}
//向父进程发送信号
if(kill(getppid(),SIGUSR2)==-1)
{
printf("process B send fail");
exit(0);
}
}
else
{
close(fdA[1]);
close(fdB[1]);
signal(SIGUSR1,endofA);
signal(SIGUSR2,endofB);
signal(SIGINT,endofC);
while(1)
{
int fdC[2];
close(fdC[1]);
//判断A与B是否运行完毕
if(flagA==TRUE&&flagB==TRUE&&flagC!=3&&flagCount==0)
{
flagC=2;
pipe(fdC);
pid_t pidC;
pidC=fork();
flagCount=1;
//C进程
if(pidC==0)
{
close(fdC[0]);
int runtimeC=0;
struct timeval startC,endC;
n=gettimeofday(&startC, NULL);
gettimeofday(&endC, NULL);
float distanceC=0;
//空跑180秒,每3秒向管道内写入已运行时间
//采用网页显示,主进程与A之间有180个像素,故速度为1
while((runtimeC=(endC.tv_sec-startC.tv_sec))<=180)
{
sleep(3);
char timeC[20]={0};
distanceC=1*runtimeC;
sprintf(timeC,"%.2f",distanceC);
gettimeofday(&endC, NULL);
int n=write(fdC[1],timeC,sizeof(timeC));
printf("\n%dC写入管道\n",n);
}
//向父进程发送信号
if(kill(getppid(),SIGINT)==-1)
{
printf("process C send fail");
exit(0);
}
exit(0);
}
}
char readA[20];
char widthA[20]={0};
char widthB[20]={0};
char readC[20];
char widthC[20]={0};
if(!flagA)
{
read(fdA[0],readA,20);
strcpy(widthA,readA);
}
else{
strcpy(widthA,"480");
strcpy(stateA,"子进程A执行完毕");
}
char readB[20];
if(!flagB)
{
read(fdB[0],readB,20);
strcpy(widthB,readB);
}
else{
strcpy(widthB,"480");
strcpy(stateB,"子进程B执行完毕");
}
char stateC[50]={0};
if(flagC==1)
{
strcpy(widthC,"0");
strcpy(stateC," ");
}
else if(flagC==2)
{
read(fdC[0],readC,20);
strcpy(widthC,readC);
strcpy(stateC,"子进程C执行中");
}
else
{
strcpy(widthC,"180");
strcpy(stateC,"子进程C完毕");
}
listen(server_socket, 5);
int client_socket = accept(server_socket, NULL, NULL);
char buf[1024];
read(client_socket, buf, 1024);
char status[] = "HTTP/1.0 200 OK\r\n";
Char header[]="Server:DWBServer\r\nContent-Type: text/html;charset=utf-8\r\n\r\n";
char body[]="<html><head><meta http-equiv='refresh' content='3'><title>多进程并发可视化</title></head><body><div style='height:250px;width:50px;background-color: red;'>父进程</div><div style='height:8px;width:0px;background-color: #00ff2f;position: absolute;left: 60px;top: 50px;'>子进程A执行进度</div><div style='height:8px;width:0px;background-color: #00ff2f;position: absolute;left: 60px;top: 200px;'>子进程B执行进度</div><div style='height:100px;width:50px;background-color: #00ff2f;position: absolute;left: 530px;top: 0px;'>子进程A</div><div style='height:100px;width:50px;background-color: #000dff;position: absolute;left: 530px;top: 150px;'>子进程B</div><div style='height:50px;width:8px;background-color: #0b000c;position: absolute;left: 550px;top: 100px;'></div><div style='height:100px;width:50px;background-color: #f113ff;position: absolute;left: 738px;top: 80px;'>子进程C</div><div style='height:8px;width:0px;background-color: #f113ff;position: absolute;left: 558px;top: 120px;'></div></body></html>";
sprintf(body,"<html><head><meta http-equiv='refresh' content='3'><title>多进程并发可视化</title></head><body><div style='height:250px;width:50px;background-color: red;'>父进程</div><div style='height:8px;width:%spx;background-color: #00ff2f;position: absolute;left: 60px;top: 50px;'>%s</div><div style='height:8px;width:%spx;background-color: #00ff2f;position: absolute;left: 60px;top: 200px;'>%s</div><div style='height:100px;width:50px;background-color: #00ff2f;position: absolute;left: 530px;top: 0px;'>子进程A</div><div style='height:100px;width:50px;background-color: #000dff;position: absolute;left: 530px;top: 150px;'>子进程B</div><div style='height:50px;width:8px;background-color: #0b000c;position: absolute;left: 550px;top: 100px;'></div><div style='height:100px;width:50px;background-color: #f113ff;position: absolute;left: 738px;top: 80px;'>子进程C</div><div style='height:8px;width:%spx;background-color: #f113ff;position: absolute;left: 558px;top: 120px;'>%s</div></body></html>",widthA,stateA,widthB,stateB,widthC,stateC);
write(client_socket, status, sizeof(status));
write(client_socket, header, sizeof(header));
write(client_socket, body, sizeof(body));
close(client_socket);
}
}
}
close(server_socket);
return 0;
}
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