Newsgroups: comp.parallel.pvm From: Matthieu Exbrayat Subject: Re: pvm: thread-safe ? Organization: C.I.S.M. Universite Claude Bernard Lyon 1 / INSA de Lyon Date: Tue, 21 Oct 1997 09:48:05 +0200 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <344C5E35.D7607330@lisiflory.insa-lyon.fr> I tried to run a similar case under Linux (2.0.30), and it seems not to work : I have 3 threads, one sending when needed, one waiting for new data, and one making internal work. The 2 pvm threads are mutually exclusive, in the way that sending (including packing) and receiving (including unpacking) are protected one from the other by a mutex. But when receiving and sending are numerous, the system is most of time crashing. I use pvm 3.4.beta4, and pthe proven's pthreads library. Well, I could propose that, as long as pvm is not compiled with the pthread library, there can some unpredictable mallocs. I could also suppose that, due to the fact that pvm uses the IPC functionnalities, while pthreads seem not to support them, there could be nasty interractions. Does anyone know if I am right? -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~ Matthieu EXBRAYAT | ~ ~ LISI - INSA Lyon | e-mail : exbrayat@lisiflory.insa-lyon.fr ~ ~ Bat 401 | ~ ~ 20, av. A. Einstein | tel : (33) 72 43 84 67 ~ ~ 69621 Villeurbanne Cedex | ~ ~-----------------------------------------------------------------------~ ~ url : http://www.insa-lyon.fr/People/LISI/matthieu ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~