making a thread wait

[Gamb Rockwell]

How do you make a parent thread wait for all threads that it has created and are still running.

thanks

[Ernest Friedman-Hill]

Use the "join" method, in a loop, like

for (each thread)
  thread.join();

[Bryan Lee]

Group the threads created by the parent... then,

while(groupName.activeCount()>0){
  Thread.yield();
}

[Ernest Friedman-Hill]

Originally posted by shiningliao:

while(groupName.activeCount()>0){
  Thread.yield();
}

Note that on many architectures, this loop will consume 100% CPU. The join() method is specifically intended to wait until a Thread completes; it does a good job, as it waits without consuming any CPU time at all. In general, one should always prefer the "right" way to do things instead of some made-up way.

[Bryan Lee]

Originally posted by Ernest Friedman-Hill:
Note that on many architectures, this loop will consume 100% CPU.

Thanks for point out the problem. I did that on WinIA32 and didn't realize
the potential problem on different architectures.

Thanks again.