Thanks john for this nice explanation. We should put it on the web.
Begin forwarded message: > From: John M McIntosh <[email protected]> > Date: August 19, 2009 8:36:28 AM CEDT > To: Stéphane Ducasse <[email protected]> > Subject: Re: I checked and I do not find the BitBltPlugin > Reply-To: [email protected] > > The way this works is that plugins are compiled either into the VM, > or as external. > For the macintosh carbon VM most plugins are internal, versus for > unix they are external. > > What happens when the plugin is referenced we first look for the > plugin as an external plugin, if not found > then we look for the plugin as an internal entry point in the VM > binary (aka internal plugin). > > However when for example you stick the bitblit external plugin in > either the applications's resource folder > or in a folder called Plugins in the same directory as the *.app > then it will load the external plugin versus > using the internal plugin. > > So if you had a Plugins folder around it could have seen the bitblit > plugin there and override the behavior > for bitblt that was compiled in May > > > SqueakPluginsBuiltInOrLocalOnly > > when set to true makes the lookup logic only consider unix libraries > or os-x bundles in > the ./Plugins folder in the same directory as the app, or the > application Resources folder, > or as a foo.framework in the /System/Library/Frameworks/. > > To turn this feature off and then consider the other 80+ choices of > library locations and > library names set SqueakPluginsBuiltInOrLocalOnly to false.Turning > the feature on > avoids a couple of hundred stat calls at startup time as the VM > hunts for external versions > of internal plugins. It was added to reduce overhead and help the > macIntel migration were > we provided new universal binaries that live in the application > Resources folder since we cann't > load powerpc plugins on macintel machines if we found them first in > the ./Pugins folder > > > > On 18-Aug-09, at 11:21 PM, Stéphane Ducasse wrote: > >> OK!!!!!! >> I was not aware of that optional behavior. >> >> stef >> On Aug 19, 2009, at 12:17 AM, John M McIntosh wrote: >> >>> Yes it is optional and I did not make it the default. But if you >>> download and install it, then it would override the vm behavor >>> >>> Sent from my iPhone >>> >>> On 2009-08-18, at 3:13 PM, Stéphane Ducasse <[email protected] >>> > wrote: >>> >>>> in the VM 4.1.1beta2U that I could download from your web page. >>>> Is it normal? Now I understand why I got problem with juan code I >>>> do not understand how it worked once. >>>> May be I got an older vm with the plugin >>>> Stef >> > > -- > = > = > = > = > = > ====================================================================== > John M. McIntosh <[email protected]> Twitter: > squeaker68882 > Corporate Smalltalk Consulting Ltd. http:// > www.smalltalkconsulting.com > = > = > = > = > = > ====================================================================== > > > > _______________________________________________ Pharo-project mailing list [email protected] http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/pharo-project
