代码
#include<iostream>
#include<thread>
#include<mutex>
#include<condition_variable>
using namespace std;
mutex mtx;
condition_variable cv;
int flag=0;
void A(){
unique_lock<mutex>lk(mtx);
int count=0;
while(count<10){
while(flag!=0) cv.wait(lk);
cout<<"thread1 : a"<<endl;
count++;
this_thread::sleep_for(chrono::milliseconds(500));
flag=1;
cv.notify_all();
}
cout<<"thread 1 finish"<<endl;
}
void B(){
unique_lock<mutex>lk(mtx);
int count=0;
while(count<10){
while(flag!=1) cv.wait(lk);
cout<<"thread 2 : b"<<endl;
this_thread::sleep_for(chrono::milliseconds(500));
flag=2;
cv.notify_all();
count++;
}
cout<<"thread 2 finished"<<endl;
}
void C(){
unique_lock<mutex>lk(mtx);
int count=0;
while(count<10){
while(flag!=2) cv.wait(lk);
cout<<"thread 3 : c"<<endl;
this_thread::sleep_for(chrono::milliseconds(500));
flag=0;
cv.notify_all();
count++;
}
cout<<"thread 3 finished"<<endl;
}
int main(){
thread t1(A);
thread t2(B);
thread t3(C);
t1.join();
t2.join();
t3.join();
return 0;
}
结果
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