How interrupt with an external variables all threads?

[I'm not completely clear on the OP's question, but it looks like an implementation of a pipeline.]

If you use a global or thread common variable like "gContinue" in C++ (or C# or java), the compiler is free to optimize access to it and you might find yourself with several threads running infinite loops. At the very least, gContinue must be declared volatile and (depending on some other unstated features of your code) it might also need to be accessed through an API such as an accessor to work correctly.

Multithreading introduces a lot of subtle memory model issues that are not obvious in a single thread environment.

I've think about signal library, and write this code:

#include signal.h

bool forever = false;

void sighandler(int sig)
{
cout<<endl<<"Signal "<<sig<<" received. Terminate program."<<endl;
forever = true;
}

...here threads functions...

int main(int argc, char **argv)
{
signal(SIGABRT, &sighandler);
signal(SIGTERM, &sighandler);
signal(SIGINT, &sighandler);

while (!forever)
{
...some operatios here
}


//join
WaitForSingleObject(handle0,INFINITE);
WaitForSingleObject(handle1,INFINITE);
WaitForSingleObject(handle2,INFINITE);
WaitForSingleObject(handle3,INFINITE);
WaitForSingleObject(handle4,INFINITE);

//end program
return 0;
}

the same while cycle are in the threads function...CTRL+C was relevated, but threads and main part related to that boolean don't end.

Can someone help me?