IPC - suggestions for synchronization of processes

[emge1]

Hello,

I am writing an app and I need some suggestions as that what is the best way to inform another process of an event so it can continue to do work.

my app will fork a new process and i want the child process to wait until the parent process does some stuff after the fork( ). how can i make this work? whats the most common or best solution to do this kinda thing?
a condition variable is only for threads right?
a signal? setting an env variable? socket? pipe? writting to a file?

thanks for the suggestions

[tashtego]

a semaphore would work.