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May 2011
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2011.05.05 19:59 "Re: Is LibTiff 3.9.5 Thread Safe ?", by Katerina Sedivy
Sorry I did not do a reply to all ... Frank, Thank you for your response. So you say that you use the TIFFGetField() in a multithread environement on multiple tiffs and it always returns the correct values for the bits per sample flag ? You do not do anything special like Bob said about the exercising ? Thanks, Katerina On Thu, May 5, 2011 at 3:03 PM, Frank Warmerdam <warmerdam@pobox.com> wrote: > On 11-05-05 02:38 PM, Katerina Sedivy wrote: > >> Let me try to explain myself better.. I have 3 folders with multiple tiff >> files. Each thread reads tiff files from a different folder therefore the >> same >> tiff file is never opened by 2 threads at the same time. >> >> Thread1 reads tiff files from folder Tiffs1 >> Thread2 reads tiff files from folder Tiffs2 >> Thread3 reads tiff files from folder Tiffs3 >> >> So I would have assumed that TIFFGetField is alway executed on a different >> TIFF >> object since I open a different tiff file handle each time before calling >> TIFFGetField . The handle to the tiff returned by TiffOpen is a local var >> in >> the execute function of the thread therefore it is not one file handle per >> thread but rather one file handle per TIFF. >> > > Katerina, > > Ah, this should work fine. There is always the possibility of a > thread safety issues somewhere in the code which might need to be fixed > but I assume this approach is fine and use it myself without apparent > problems. > > Sorry for misunderstanding. > > > 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 > >