Re: [Caml-list] Threads & the order that module initialization code runs

[Michel Christophe <tofm2@yahoo.fr>]

Thanks for answers



Le mar 01/07/2003 à 15:34, Richard Jones a écrit :
> A quick question about threads:
> 
> I have a few modules simulating a network and some machines connected
> to the network.
> 
> In, for example, network.ml, I have a bunch of initialization code at
> the top level:
> 
> --- network.ml ---
> let new_queue i =
>   (Queue.create (),
>    Mutex.create (),
>    Condition.create ()) in
> let out_queue = Array.init nr_machines new_queue
> 
> (* There is one queue of incoming messages to the network thread. *)
> let in_queue = Queue.create ()
> 
> (* Mutex/condition protecting the in_queue. *)
> let in_mutex = Mutex.create ()
> let in_cond = Condition.create ()
> ------
> 
> And also I have a Main module which starts up the threads:
> 
> --- main.ml ---
> (* Create a thread to simulate the network. *)
> let network_thread = Thread.create Network.run ();;
> 
> (* Start a thread for each of the simulated machines. *)
> let machine_thread = Array.init nr_machines (Thread.create Machine.run);;
> ------
> 
> It's obviously going to be a problem if the initialization code in
> Network hasn't run by the time the machine threads have been started
> up in Main (or if the network thread itself gets started up first).
> 
> Now it all seems to work, but am I being lucky or do module
> initializers run in some sort of well-defined order I can depend on?
> 
> Rich.

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