[Lldb-commits] [lldb] r202525 - Fixed all overlapping prompt issues.

Ed Maste emaste at freebsd.org
Wed May 21 07:15:58 PDT 2014

On 4 March 2014 16:55, Greg Clayton <gclayton at apple.com> wrote:
> So the timing of when the process IO handler gets pushed seems to be the timing difference. On MacOSX, the IOHandlerProcessSTDIO gets pushed as we are handling the "process launch" or "process attach" and before it asks for another line, the IOHandlerProcessSTDIO is already pushed. Not so for the linux and free bsd case. Does that sound like what you are seeing?

Hi Greg,

I had a little time to look at this again this morning.  Yes, what you
describe sounds like what I'm seeing:

1. ProcessFreeBSD::DoResume returns
2. (lldb) prompt is printed
3. Debugger::PushIOHandler is called

It's not yet clear to me how we should ensure the stdio IOHandler is
pushed prior to emitting the prompt.  As a hack, I added a short sleep
in Process:PrivateResume, and that's sufficient to avoid the race:

diff --git a/source/Target/Process.cpp b/source/Target/Process.cpp
index 5fd73cb..a71fc14 100644
--- a/source/Target/Process.cpp
+++ b/source/Target/Process.cpp
@@ -3527,6 +3527,7 @@ Process::PrivateResume ()
     else if (log)
         log->Printf ("Process::PrivateResume() got an error \"%s\".",
error.AsCString("<unknown error>"));
+    usleep(100);
     return error;

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