reset/terminate problems; preventing multiple XWin instances

Takuma Murakami
Thu Mar 4 09:02:00 GMT 2004


> On 29-02-2004 14:11, Takuma Murakami wrote:
>  >> As for preventing multiple instances of XWin
>  > This feature is already implemented in my local tree (not
>  > port based but mutex based detection).
> I see that it's in 4.3.0-50 and working well, but I don't see how the 
> current implementation addresses the common task I mentioned:
>    "open an xterm; run XWin first if needed"
> If I use a batchfile that always runs XWin and then xterm, from the 2nd 
> invocation onwards it will produce the error popup reporting a "Fatal 
> error" and directing me a to log file... Not quite what's needed here.[1]
> Perhaps there should be a switch that says "if the display already 
> exists, exit silently".

I agree.  We should have an option like "-silent" or "-quiet".

> But that doesn't solve the case where I want to run additional programs 
> (say, twm and xeyes) whenever a new display is created -- again a common 
> scenario, I believe. One way to solve this is to add an option for 
> checking the presence of an XWin instance on the given display number 
> and exiting immediately with a corresponding errorcode; a batchfile can 
> then check for the existance of an XWin instance, and if negative spawn 
> XWin and related stuff. But this could lead to a race condition if two 
> batchfiles do the check simultaneously. An alternative is to add an 
> option for XWin to run some executable iff its startup succeeded.

Let's suppose Cygwin/X has -silent option as above: then I
think startxwin.bat with -silent option is sufficient for your
purpose.  It will start a server (which silently fails if there
is the other) and then start some favorite applications.

Takuma Murakami

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