Newsgroups: comp.parallel.pvm From: Norbert Sensen Subject: pvm: thread-safe ? Organization: University of Paderborn Date: Thu, 16 Oct 1997 13:48:50 +0200 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <3445FF22.313F8E2D@uni-paderborn.de> Hallo, i've just read your old message in comp.parallel.pvm: ------------------------------------- Subject: Threads and PVM 3.4beta? From: wrankin@duke.edu (William T. Rankin) Date: 1997/07/30 Message-Id: <5rnjl8$5fi$1@news.duke.edu> Distribution: world Organization: Duke University EE Dept.; Durham, NC Newsgroups: comp.parallel.pvm [Fewer Headers] Firstoff, thanks to the PVM group for all their efforts in brining out 3.4. I am downloading it now and will try to give some feedback on any problems I run into, as well as the new features (I am *really* looking forward to using the message-handler features :-) (And now that I've buttered them up enough... ;-) The PVM homepage advertized that thread safty issues would be addressed in 3.4, but I noticed that they are not on the 3.4-beta3 brag sheet. Is there any update on when/if we can expect a thread safe PVM 3.4? In the meantime, will the following workarounds "work"? - I assume that I can have PVM in a multi-threaded program as long as all PVM calls are performed by the same thread. - I can take the approach of Adam Ferrari up at Virginia (is Adam still there?) w/ TPVM and wrap all my PVM calls with mutex locks. However, can I have *one* simultanious pvm_send() with a pvm_recv()? .. or must the receive and send calls also be mutually exclusive with each other? Any other suggestions would be appreciated. Thanks for all the help, ----------------------------------- Unfortunately i have not found an answer to your question. Now i have roughly the same problem you have: I want to use pvm (3.3.11) with threads. So i know that pvm is not thread-safe. But what does it mean exactly ? Can i use threads and pvm together, if i ensure that from each process with two threads always only one uses pvm-commands, the other thread does not use pvm at all and communicates with the other thread per shared memory and semaphers. Does this work togehter with pvm or does not thread-safe means that even this relatively simple use is not allowed? Can you (or someone else) help me ? Thank you very much, Norbert Sensen -- ------------------------------------------------------------------ Norbert Sensen University of Paderborn office: F2.411 Dept. of Computer Science phone: +49 +5251 60-6728 Fuerstenallee 11 e-mail: sensen@uni-paderborn.de ------------------------------------------------------------------