Subj : Re: How to suspend threads of father process after fork()
To   : comp.programming.threads
From : Loic Domaigne
Date : Fri Jun 03 2005 10:56 pm

Salut Tony,

 > Would you give me some suggestions on how to stop the threads
 > when waiting for the child process to execute?

Assuming that you really need this feature (see DS post), the answer to
your questions depends largely of your threads and your exact
requirements...

You can ensure that the threads in the parent process shall run after
the child process has started (is it what you want?) using the
following scheme

In the parent process:

1) The parent thread forks the child.
2) The other threads are waiting on a condition variable, which shall
be signaled when the child sends a "GO" message to the parent thread.
3) The parent thread waits for the "GO" message from the child.
4) After receiving the "GO" message, it broadcasts the condition
variable that the child has started.

In the child process:

1) When started, it communicates to the parent thread a "GO" message.

Any IPC between the parent thread and the child does it. An simple
solution would consist to use a pipe for instance.


HTH,
Loic.

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