Re: [Help-smalltalk] Add shortcuts to the visualgst/debugger

[Holger Hans Peter Freyther]

On Mon, Sep 30, 2013 at 10:47:31AM +0200, Holger Hans Peter Freyther wrote:

Hi,

and one more information:

> So I think what is happening is the following:
> 
> * We are in the glib mainloop
> * We get an event (F7.. keyboard)
> * We use gst_nvmsg_send which will create a new Process (call-in)
> * We dispatch GtkDebugger>>#stepOver
> * We want to step/resume another process..
> * We wait on a semaphore..
> * The debugged process doesn't run (for whatever reason)
> * The call-in is waiting on a Semaphore as well

to make it worse.. the call-in will be suspended because it is
launching a debugger...

'Invalid index 13: index out of range'
SystemExceptions.IndexOutOfRange(Exception)>>signal (ExcHandling.st:254)
SystemExceptions.IndexOutOfRange class>>signalOn:withIndex: (SysExcept.st:665)
String(Object)>>checkIndexableBounds: (Object.st:798)
String>>at: (String.st:312)
String(SequenceableCollection)>>replaceFrom:to:with:startingAt: 
(SeqCollect.st:554)
String>>replaceFrom:to:with:startingAt: (String.st:296)
String(ArrayedCollection)>>copyFrom:to: (ArrayColl.st:236)
ReadStream(PositionableStream)>>copyFrom:to: (PosStream.st:156)
STInST.RBParser>>errorLine (Parser.star#VFS.ZipFile/RBParser.st:183)
STInST.RBParser>>parserError: (Parser.star#VFS.ZipFile/RBParser.st:207)
STInST.RBParser>>parseExpression (Parser.star#VFS.ZipFile/RBParser.st:153)
STInST.RBParser class>>parseExpression:onError: 
(Parser.star#VFS.ZipFile/RBParser.st:35)
STInST.RBParser class>>parseExpression: (Parser.star#VFS.ZipFile/RBParser.st:26)
UndefinedObject>>executeStatements (a String:1)
      6         ^self activateHandler: (onDoBlock isNil and: [ self isResumable 
])

The question is.. is this a VisualGST issue or should the VM
be more robust against such deadlocks? I think we could have
a couple of 

if (cur_state == STATE_DISPATCHING && blocking)  
    {
      event_loop_unlock ();
      return;
    }

in the vm, like in gst_interpret?

comments?