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Message-ID:	<40CFD6E5.1070709@luukku.com>
Date:	Wed, 16 Jun 2004 08:13:09 +0300
From:	Jani tiainen <redetin AT luukku DOT com>
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To:	cygwin AT cygwin DOT com
Subject:	Re: Ctrl-Z fails to suspend Windows programs
References:	<87n035b3kn DOT fsf AT eu DOT citrix DOT com> <20040615120142 DOT GA30776 AT trixie DOT casa DOT cgf DOT cx> <40CEED71 DOT 7020407 AT luukku DOT com> <20040615131311 DOT GB30776 AT trixie DOT casa DOT cgf DOT cx>
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Christopher Faylor wrote:
> On Tue, Jun 15, 2004 at 03:37:05PM +0300, Jani tiainen wrote:
> 
>>Christopher Faylor wrote:
>>
>>>On Tue, Jun 15, 2004 at 09:58:16AM +0100, John Cooper wrote:
>>>
>>>>Is it a known limitation that "native" Windows programs cannot be
>>>>suspended?
>>>
>>>Yes.  Window programs do not understand cygwin signals.
>>
>>Thats true for cygwin part.  Native programs still can be
>>suspended/resumed but not by cygwin (or shell that is running and
>>waiting finishing of active process).
> 
> 
> It is true for any part that Windows programs do not understand cygwin
> signals.
> 
> There is no way to reliably suspend a Windows programs.

Yes there is ( piece of pseudo code):

For Each Thread THREAD_Y in Process PROCESS_X
	Call_Win32API SuspendThread(THREAD_Y.Handle)
Next

NOTE: In Win2k and later you need THREAD_SUSPEND_RESUME rights for 
particular thread.

-- 

Jani Tiainen

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