Condition variable question

[samzcs]

Try to write a small program.almost forgot task sync concept, need some help. task1: if (cx == True) { do task1(); cx = False; } task2: if (cx == False) { do task2(); cx = True; } Is possible the 2 tasks step in a deadlock situation? Thanks

[Lost User]

Yes; see Thread Synchronization for Beginners[^].

[focusdoit]

can you explain a little more ? thanks

[Lost User]

Explain what?

[focusdoit]

Why the above code could be deadlock. thanks

[Lost User]

Because they are both using the same variable without checking that it is free to update. Follow the link in my response and read about thread synchronisation.

[focusdoit]

So use While(cx != True) ; similar code could resolve it?

[Lost User]

Possibly, but threads do not always behave the way you expect.

[focusdoit]

Sure, the code is embedded software code, no OS, so, do you think there is a better way to implement the condition variable?

[Lost User]

That's a whole new question.