[lldb-dev] non-stop mode with lldb-mi?

[Jim Ingham via lldb-dev]

> On Feb 3, 2017, at 8:45 AM, Greg Clayton via lldb-dev <lldb-dev at lists.llvm.org> wrote:
> 
> Non-stop mode is a huge change to the core of LLDB isn’t it. I think you might think this is easier than it actually is to enable in LLDB? 
> 
> Is non-stop mode where you can leave some threads running while others are stopped? The biggest issue with this is to do it right we need to be able to emulate instructions so that if 3 threads hit breakpoints, we would need to emulate the instruction that used to be at the breakpoint in LLDB since we can’t remove the breakpoint (unless you stop the other threads which defeats the purpose of non-stop mode) without the other 2 threads possibly missing the breakpoint while you disable breakpoint, single step, enable breakpoint.

That is just one of the many things that will have to be changed to support non-stop mode.  For now, non-stop mode is only likely to work reliably if the threads you are allowing to run never stop - hit breakpoints, crash or whatever - so worrying about missing breakpoints is a second order problem.  

Anyway, even as it is it has some utility - presumably you're using it because you have some threads in your program that can't stop, so you're not likely to want them to hit breakpoints anyway...  But the current help text for the non-stop setting should probably include some appropriate caveats.

Jim


> 
> Greg
> 
>> On Feb 3, 2017, at 7:54 AM, Ted Woodward via lldb-dev <lldb-dev at lists.llvm.org> wrote:
>> 
>> That turns on and off async, but not non-stop.
>>  
>> I’m working on adding support for –gdb-set and –gdb-show non-stop, and will post my changes on phabricator when I’m done.
>>  
>> --
>> Qualcomm Innovation Center, Inc.
>> The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
>>  
>> From: Ilia K [mailto:ki.stfu at gmail.com] 
>> Sent: Wednesday, February 01, 2017 11:13 PM
>> To: Ted Woodward <ted.woodward at codeaurora.org>
>> Cc: LLDB <lldb-dev at lists.llvm.org>
>> Subject: Re: [lldb-dev] non-stop mode with lldb-mi?
>>  
>> Please check `-gdb-set target.async` option. Probably that's what you need.
>>  
>> On Thu, Feb 2, 2017 at 1:44 AM, Ted Woodward via lldb-dev <lldb-dev at lists.llvm.org> wrote:
>>> Does lldb-mi support non-stop mode?
>>>  
>>> If so, is there a way to set it besides “settings set target.non-stop-mode true”?
>>>  
>>> --
>>> Qualcomm Innovation Center, Inc.
>>> The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
>>>  
>>> 
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>> 
>> 
>>  
>> -- 
>> - Ilia
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