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December 2004
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2004.12.20 20:42 "Re: multithreading issues", by Frank Warmerdam
On Mon, 20 Dec 2004 15:16:57 -0500, Bill Bither <bill.bither@atalasoft.com> wrote: > For testing we are using XP Pro. It's being used in the .NET framework, > I'm unsure if it's a problem with other development environments. We > made no other changes to our code other than upgrading LibTiff, and we > made all necessary multithreading precautions in our code. Version > 3.6.1 doesn't express this behavior, while 3.7.X CVS does. Bill, Are you using tif_win32.c? I had some strange heap corruption (or so it seemed) problems in heavy use of 3.7.x CVS a few weeks ago which went away when I switched to using tif_unix.c (on win32) as opposed to tif_win32.c. In my case I was running a hefty test stream which included alot of TIFF usage and was seeing roughly random crashes which seemed to be indicative of heap corruption. I don't know if the core problem was ever resolved, but I was unable to reproduce it on unix, or under purify. I suspected it was a problem with my code free()ing something allocated with a TIFF function or the other way around (as tif_win32 does not use malloc() directly) but my efforts at verifying this failed. Purify always seems to fail me when I need it most, and it is my only memory checker on win32. On linux I use valgrind which I found found to be emmensely helpful into isolating subtle problems that are not win32 specific. Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Programmer for Rent