> -----Original Message----- > From: David Kantrowitz [mailto:kantrow...@diaginc.com] > Sent: 20. oktober 2010 17:02 > To: lcms-user@lists.sourceforge.net > Subject: [Lcms-user] Are transforms thread safe? > > Hi! > > I'm trying out LCMS2 for a project. So far it's working > nicely but I'd like to speed up the application of a > transform. My question is this: > Is it safe to create a single transform on the main thread > and apply it (via DoTransform) on multiple threads running > concurrently? I'm creating the transform with > CreateMultiprofileTransform. > > If so, are there any settings I must use, such as #defines, > to make the operation thread-safe?
Hi. This issue came up before, and the answer was that you need to pass the flag cmsFLAGS_NOCACHE to, say, cmsCreateMultiprofileTransform(). This may or may not affect the performance of the transform. If the one-pixel cache is important, it will slow you down. This is also the case where the problems will tend to show up if the flag is not set. I have tried this and it does seem to work well. I would like to lobby for an official flag that makes this valid in the future. For now it could just alias to cmsFLAGS_NOCACHE. Regards, Esben H-R Myosotis ------------------------------------------------------------------------------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
