how can I achive when, do?

[Subsonics]

What different ways are available to achive an action, when a specific event has occured besides a callback or making a loop that does nothing but wait for a condition to become true?

I have read up a bit on signals in unix, would it be possibel to make a function pause until it recieves a signal from another function?

I have used the "waiting in a loop" for now but it wastes a lot of cpu resources.

[creeping death]

i dont quite understand what your requirement is...but if its multiprocessing feature you are looking for then...

http://www.opengroup.org/onlinepubs/...ions/fork.html
http://www.opengroup.org/onlinepubs/...six_spawn.html

if you want to make a function wait for another function then...

http://www.opengroup.org/onlinepubs/...ions/wait.html
http://www.opengroup.org/onlinepubs/...igsuspend.html

for threads
http://www.opengroup.org/onlinepubs/...ons/pause.html

[Subsonics]

Thank you, as far as I can tell pause could work it seems. What I have is a loop that sends packets from a packet array to a network, but the condition is that a packet can´t be sent until an o.k flag has been recieved.

The input is handled by a callback in another thread that polls the input. If I can get my loop to pause after each packet until it recieves a signal that the packet arrived successfully that would be great.