[lldb-dev] More linux process control and IOHandler races
mg11 at csr.com
Fri Aug 8 00:24:39 PDT 2014
Shawn Best wrote:
> Hi Matthew,
> I think the other stops are perfectly normal. There are cases where
> the inferior program will temporarily stop (for example waiting to
> load dependent libraries, or maybe stepping over multiple instructions
> in a section of code). In these 'private stop' cases, it is
> determined the stop is temporary and it will quietly restart the program.
For a "program launch" where the user does not want to stop at the
inferior's entry point, then only 1 stop should occur. Compile the
program I've attached, in linux, it launches a program (/bin/ls - which
has shared library dependencies on my system) with a tracer and wait for
stops. Perhaps there's good reason for the other 2 stops when lldb is
the debugger, I'm just unaware of them right now.
Jim Ingham, I think may be alluding to other reasons why we see 3 stops
on "program launch" in his mail on this thread, but I've not digested
that mail thoroughly yet.
> In the case where the program is meant to stop (i.e. hitting a
> breakpoint) the event is broadcast so the state machine in
> HandleProcessEvents picks it up and changes the public state to stop,
> dumps some information and pops the IOHandler so the user can interact
> with the command line.
> I went through the same steps as you chasing this problem. I also
> stepped through the equivalent code on OSX, which does it completely
> different and bypasses this issue.
Ok, fair enough. I don't know the differences between OSX and linux, or
why as you say, a completely different flow happens which avoids our
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