ez-cdda sleep

Mike Hearn mike at navi.cx
Mon Oct 4 05:24:45 CDT 2004

Possible ideas:

> - implement suspend/resume in processes without any specific code. We 
> dropped that long ago for stability issues (and race condition removal 
> as well)
> - cheat for context reading in server while suspended. it will require 
> some surgery (getting whether we are in the condition of this program, 
> getting back to the signal handler, getting the signal context from 
> the stack, grab the real EIP from it). Doable, but very hard to 
> maintain (code in server, will depend on how signal handlers are 
> written in ntdll, code will be CPU specific...)
> - storing context in server while entering USR1 signal handler (to be 
> done without races, which will require some more work, as the server 
> doesn't synchronize with the USR1 handler)
> Nice can of worms :-/

Why can't we have the server ptrace the process to suspend it like gdb 
would? I suppose the answer must be obvious for it not to be included on 
the list but I don't know enough to figure it out.

thanks -mike

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