Newsgroups: comp.parallel.pvm
From: sinedino@ep.petrobras.com.br
Subject: Re: message queue
Organization: Deja News - The Leader in Internet Discussion
Date: Tue, 17 Mar 1998 13:57:00 -0600
Message-ID: <6emkf6$51n$1@nnrp2.dejanews.com>

In article <350E8FBA.41C6@ci-1.ci.pwr.wroc.pl>,
  Mariusz Nowostawski <nowostawski@ci-1.ci.pwr.wroc.pl> wrote:
>
> Dear readers
>
> I have one (simple) question and I would appreciate if somebody could
> tell me wether I am right or wrong.
>
> Let say I have 3 processes A, B and C, with tids A_ B_ and C_TID
> respectively.
>
> A:     	....
>  	pvm_initsend(PvmDataDefault);
> 	pvm_send(C_TID, A_MSGTAG);
>
> B:   	....
>  	pvm_initsend(PvmDataDefault);
> 	pvm_send(C_TID, B_MSGTAG);
>
> C:	...
> 	pvm_recv(A_TID, A_MSGTAG);
> 	pvm_recv(B_TID, B_MSGTAG);
>
> if A sends his message first, everything is fine, but if C sends its
> message first, B is blocked. Yes?
>
> Thank you in advance
>
>                               Mariusz
> ----------------------------------------
>
   Dear Mariuz,
   In this way you put, yes. To avoid this you could use 'pvm_probe' to
check if the message from A has arrived. If yes, then you use 'pvm_recv'  if
not, you try to receive from B and after you look to A again.
   Sorry for my poor English.
   Best regards,
                 Silvio Sinedino.

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