[squeak-dev] Re: [Vm-dev] OSProcess in Cog

David T. Lewis lewis at mail.msen.com
Sun Jul 25 19:01:05 UTC 2010


On Sun, Jul 25, 2010 at 12:24:33PM -0400, Rob Withers wrote:
> 
> --------------------------------------------------
> From: "David T. Lewis" <lewis at mail.msen.com>
> Sent: Sunday, July 25, 2010 11:58 AM
> To: "Squeak Virtual Machine Development Discussion" 
> <vm-dev at lists.squeakfoundation.org>
> Cc: "Squeak Dev" <squeak-dev at lists.squeakfoundation.org>
> Subject: Re: [Vm-dev] OSProcess in Cog
> 
> >
> >On Sun, Jul 25, 2010 at 10:59:04AM -0400, Rob Withers wrote:
> >>
> >>I am trying to load and run OSProcess in Cog.  I loaded:
> >>
> >>   OSProcess-Base
> >>   OSProcess-AIO
> >>   OSProcess-Win32
> >>   OSProcess-Unix
> >>   OSProcess-Tests
> >>
> >>Then ran the tests.  Many failures.
> >>
> >>I looked at the vm and there is no ProcessPlugin or OSProcessPlugin.
> >>Should there be?
> >
> >OSProcess will not work without the OSProcessPlugin. AFAIK no one has
> >tried this yet (including me - sorry I've been quite busy lately).
> >
> 
> What about the AIOPlugin?

AIOPlugin is Unix only, and totally optional. OSProcess and CommandShell
will both work without it.

> >>What should I do?
> >
> >If you are compiling your own COG VM, then load OSProcessPlugin from
> >SqueakSource and give it a try. But just to set expectations, I will
> >be (pleasantly) surprised if it works the first time without 
> >modifications,
> >so consider it pre-alpha at this point.
> 
> I loaded the OSProcessPlugin package and generated sources under Windows.  
> I built using Cygwin.  It gave me a Win32OSProcessPlugin.dll.
> 
> I ran the tests.  It said I don't have the AIOPlugin so it was using 
> polling (I think that is what it  said).  Tests failed in 
> AioEventHandlerTestCase (failures) and OSPipeTestCase (errors).  Many 
> OSPipeTestCase failures have to do with AttachableFileStream being closed.
> 
> I tried the following code and it failed because stdout was closed:
> 
> ThisOSProcess thisOSProcess openConsole.
> ThisOSProcess thisOSProcess stdOut
> 	nextPutAll: ('error count: ',
> 		CryptoDESTest suite run errorCount asString);
> 	flush.
> 
> Which is what I need OSProcess for.

On Windows, you will need to do one hack in order for this to work.
In the platforms sources, edit platforms/win32/vm/sqWin32HandleTable.h
and disable the handle registry checking. IIRC, you can just hack
the IsHandleInTable() function to always return true.

> Another issue: I am trying to generate sources so I can move them from 
> Win32 to Unix and compile the vm there.  I cannot run VMMaker on linux - it 
> is headless/no X.  I noticed that the OSProcessPlugin generates per 
> platform, and in fact there is platform support code.  So under Windows, we 
> generate a Win32OSProcessPlugin.  Under Unix I assume it generates a 
> UnixOSProcessPlugin.  Is there any way I can generate a UnixOSProcessPlugin 
> under Windows?

Open your VMMaker window in Squeak, click the "Find platform" button,
and change from "Win32" to "unix". Generate your sources, and you
should have the Unix variant of OSProcessPlugin rather than the Windows
flavor.

In principle should should work for all of the sources, although
I have not tried. It definitely should produce correct Unix sources
for OSProcessPlugin, AIOPlugin, and XDisplayControlPlugin (though
I don't have a Windows system handy to check).

Note that the handle registry issue mentioned above applies only
for building the Windows plugin to run on a Windows platform. There
is no such handle registry on Unix and Mac.

Dave



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