A difficult Question for me

Hi

My question is like:

There are two modules A and B, if in module A (e.g. push a button), it sends a flag = true to module B where there is while loop:

Code:

---

while(flag){ do something}

---

in normal case, this could cause system busy and no responding because this program is only excuting the infinite while loop in module B, but my idea is that if push button again in module A,
---> flag = false, and module B would stop loop.

Here I've to use while loop to reach my goal or is there any other way to get the same goal?

I hope I make this problem clear:) , Thanks for your help much

What do you mean by modules? Do you mean threads/processes, or something else?

I'm not sure I understand why you want to loop in the first place. What I get is: you press a button in one program, the other program loops until you press the button again. Is that correct?

Could you explain further, and post any other code you have. Also state your aim and project details.

Sorry for my bad English :(

There are main.c (where windows created sending the flag to loop.c) and

loop.c (where the loop is excuted according to

Code:

---

while(flag){do something}

---

Now, in the main.c, it sends a message to loop.c that set flag to TRUE, and loop.c receives the message and start looping.

Normally it willl cause the system busy because now it is a infinite loop, so I think there might be some ways like interrupt() to set flag to FALSE or multi-threads. If i am right, any more details about this, otherwise, some solutions??? THanks again!!

Some options (in order of preference):

1. Use a timer to perform the action in loop.c at every interval, say 10 times a second or whatever you need.

2. Launch a second thread to run loop.c code.

3. Pump the message loop from within the loop. Something like a DoEvents function.