On Fri, Jul 23, 2010 at 09:49:46AM +0200, Lukas Renggli wrote:
> > But How I can do that without fork? I track changes in another process and
> > when I do update I save image in this process.
> > How I can initiate image saving from ui process?
>
> I don't understand what you are saying.
>
> The thing is that using #fork to save the image has no effect (other
> than wrecking the image), because #snapshot:andQuit: is eventually
> calling a primitive that locks the complete VM anyway.
>
> If you want to fork while saving the image you need to use an OS-level
> fork, not a Smalltalk-level fork. You can do this with OSProcess for
> example (check the Seaside mailing-list archive).
"UnixProcess saveImageInBackgroundNicely"
Explained in the method comment:
UnixProcess class>>saveImageInBackground: savedImageName nice: niceFlag
"When Squeak is used as a server it is sometimes desirable to
periodically
save image snapshots. This method forks a headless Squeak to perform a
snapshot without impacting the server Squeak. Very little additional
memory
is required to do this because Unix copy-on-write memory management
allows
the two Squeak images to share object memory while the save is
performed.
The saved image is given a time stamped name, and the image name of
the main server Squeak remains unchanged. If niceFlag is true, the
background OS process runs at lowered scheduling priority."
Dave
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