[Vm-dev] Question on Embedding Squeak

John M McIntosh johnmci at smalltalkconsulting.com
Sat Feb 23 09:28:18 UTC 2008

Well certainly the hydra VM work he should look at.

The browser plugin code at

could be examined too, it was written mostly by Bert Freudenberg with  
changes by myself to let you start a netscape plugin os-x safari/ 
firefox which setups a shared
memory area (non-trival because instructions how to do this are vague)  
and two pipes to let the plugin code stuff interact with a headless VM  
via execv(plugin->vmName, plugin->argv);

The pipes are used to pass control information between the plugin stub  
and the headless VM
The shared memory area is the quartz window canvas, other operating  
such as windows and X11 let you deal with remote surface display in an  
easier manner.

There is a bunch of nasty semaphore logic to deal with preventing the  
VM from burying the browser with update requests, plus code to figure  
out if the browser has gone away.

Thus the headless VM is feed UI events and serves back UI images to  
the browser.

On Feb 22, 2008, at 6:55 PM, tim Rowledge wrote:

> Gulik's reply reminds me that you might find the code that allows  
> the VM to be a browser plugin instructive. Part of your interest  
> will likely be that there is so little needing changing.
> I'll leave it to John McI to explain the details since he's probably  
> done most of the code fudging involved.
> tim
> --
> tim Rowledge; tim at rowledge.org; http://www.rowledge.org/tim
> Never write software that patronizes the user.

John M. McIntosh <johnmci at smalltalkconsulting.com>
Corporate Smalltalk Consulting Ltd.  http://www.smalltalkconsulting.com

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