From: Dima B. <di...@cs...> - 2003-05-28 16:56:33
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Upon further investigation I have found the following. If I have: Process 1 Process 2 open( pipe1, O_WRONLY ) -->-->--> pipe 1 -->-->--> open( pipe1, O_RDONLY ); open( pipe2, O_RDONLY ) --<--<--< pipe 2 --<--<--< open( pipe2, O_WRONLY ); The valgrind gets stuck on the open call on pipe1 in process 2. It only gets stuck in my larger program, a smaller program that just opens the pipes works fine. My bigger program has many threads, but at the time of pipe creation no threads have been started up yet. No if I have: Process 1 Process 2 open( pipe1, O_RDWR ) -->-->--> pipe 1 -->-->--> open( pipe1, O_RDWR ); open( pipe2, O_RDWR ) --<--<--< pipe 2 --<--<--< open( pipe2, O_RDWR ); ^ ^ | | Than everything works fine. Will provide an strace output shortly. ttyl Dima On Wed, May 28, 2003 at 01:02:47AM -0700, Jeremy Fitzhardinge wrote: > On Tue, 2003-05-27 at 21:11, Jeremy Fitzhardinge wrote: > > On Tue, 2003-05-27 at 18:41, Dima Brodsky wrote: > > > I am not sure why and what is causing the problems. I have not used > > > previous versions of valgrind with named pipes so I don't know if things > > > were broken or not before. > > > > Valgrind doesn't deal with the blocking semantics of FIFO files. I have > > a patch, but it doesn't apply to the current tree; I'll need to update > > it. I've attached it in its current form if you want to play with it > > before I get to it. > > Silly me. This is already in there. If you're seeing problems, it > would be useful if you can provide a small program which reproduces it. > strace output would be useful too. > > J > > > > ------------------------------------------------------- > This SF.net email is sponsored by: ObjectStore. > If flattening out C++ or Java code to make your application fit in a > relational database is painful, don't do it! Check out ObjectStore. > Now part of Progress Software. http://www.objectstore.net/sourceforge > _______________________________________________ > Valgrind-users mailing list > Val...@li... > https://lists.sourceforge.net/lists/listinfo/valgrind-users -- Dima Brodsky di...@cs... http://www.cs.ubc.ca/~dima 201-2366 Main Mall Department of Computer Science (604) 822-2895 (DSG Lab) University of British Columbia, Canada (604) 822-5485 (FAX) "The price of reliability is the pursuit of the utmost simplicity. It is a price which the very rich find the most hard to pay." (Sir Antony Hoare, 1980) |