两个线程按特定时间顺序交替执行

1、用到setitimer()函数，设定定时器

2、boost库用于创建两个线程

3、signal()用于将定时信号与响应函数绑定

源码如下：

#include<iostream>
#include<csignal>
#include<sys/time.h>
#include<boost/thread/thread.hpp>
using namespace std;

bool en_transmit=false,en_receive=false;

void transmit(void){
cout<<"Transmit called..."<<endl;
while(en_transmit){cout<<"";}
cout<<"Finished Send..."<<endl<<endl;
return;
}

void receive(void){
cout<<"Receive called..."<<endl;
while(en_receive){cout<<"";}
cout<<"Finished Recv..."<<endl<<endl;
return;
}

bool period=false;
void sigroutine(int signo){
pthread_t send,recv;
cout<<signo<<endl;
boost::thread_group threads;
switch(signo){
case SIGALRM:
en_receive=false;
en_transmit=true;
threads.create_thread(&transmit);
break;
case SIGVTALRM:
en_transmit=false;
en_receive=true;
threads.create_thread(&receive);
break;
}
return;
}

int main(){
struct time{
int sec;
int usec;
};

struct time period;
period.sec=5;
period.usec=0;
struct itimerval value,ovalue,value2;

signal(SIGALRM,sigroutine);
signal(SIGVTALRM,sigroutine);

value.it_value.tv_sec=1;
value.it_value.tv_usec=0;
value.it_interval.tv_sec=period.sec;
value.it_interval.tv_usec=period.usec;
setitimer(ITIMER_REAL,&value,&ovalue);

value2.it_value.tv_sec=2;
value2.it_value.tv_usec=0;
value2.it_interval.tv_sec=period.sec;
value2.it_interval.tv_usec=period.usec;
setitimer(ITIMER_VIRTUAL,&value2,&ovalue);

while(1){
pause();
}

return 0;
}

编译：g++ thread.cpp -o thread -lboost_thread

运行效果如下：