ez-cdda sleep

[Eric Pouech]

Mike Hearn a écrit :
> 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.
ptrace uses SIGSTOP on the child process, so it boils down to the first 
item in the list
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