Hi Greg,
On 3 March 2014 16:09, Greg Clayton <[email protected]> wrote:
> 4 - continue
> IOHandlerProcessSTDIO gets pushed
> we get eStateRunning event and any message gets placed into stream
> stream gets printed to debugger console
>
> [0] - IOHanderEditline
> [1] - IOHandlerProcessSTDIO
>
> 5 - hit breakpoint or finish step
> stdout gets placed into stream (if any)
> stderr gets placed into stream (if any)
> get eStateStopped event and stop info gets placed into stream (like
> thread and stack frame zero)
> stream gets printed to debugger console
> IOHandlerProcessSTDIO gets popped which causes the "(lldb) " prompt
> to show up
>
> [0] - IOHanderEditline
>From what I can see this is what happens, but the (lldb) prompt comes
out after IOHandlerProcessSTDIO is pushed.
I added some logging where IOHandlers are pushed/popped, and in
PrivateGetLine(). I'm not completely sure how the logging will
interact with the debugger and target I/O; with that said, this is
what I see. This is with log enable -p, showing the pid/tid that
produced the log message.
step
[15e8/18db5]: process 5611 resuming (continue)
[15e8/18db5]: ProcessMonitor::Resume() resuming pid 5611 with signal (null)
[15e8/18db5]: ProcessMonitor::Resume() resuming result = true
[15e8/1898c]: ::PushIOHandler push iohandler 0x808cc2300
[15e8/18913]: ProcessMonitor::MonitorSIGTRAP() received breakpoint
event, tid = 103336
[15e8/18db5]: ::PrivateGetLine
[15e8/1898c]: ::PushIOHandler deactivated 0x808d34340
(lldb) [15e8/1898c]: ProcessPOSIX::RefreshStateAfterStop(),
message_queue size = 1, pid = 103336
[15e8/1898c]: ProcessFreeBSD::UpdateThreadList (pid = 5611)
[15e8/1898c]: ProcessFreeBSD::UpdateThreadList existing tid = 103336
[15e8/1898c]: process 5611 resuming (step)
[15e8/18913]: ProcessMonitor::MonitorSIGTRAP() received trace event,
tid = 103336 : si_code = 2
[15e8/1898c]: ProcessPOSIX::RefreshStateAfterStop(), message_queue
size = 1, pid = 103336
[15e8/1898c]: ProcessFreeBSD::UpdateThreadList (pid = 5611)
[15e8/1898c]: ProcessFreeBSD::UpdateThreadList existing tid = 103336
Process 5611 stopped
* thread #1: tid = 103336, 0x0000000000403072 ls`main(argc=1,
argv=0x00007fffffffd578) + 18 at ls.c:166, stop reason = step in
frame #0: 0x0000000000403072 ls`main(argc=1,
argv=0x00007fffffffd578) + 18 at ls.c:166
163 char *bp = tcapbuf;
164 #endif
165
-> 166 (void)setlocale(LC_ALL, "");
167
168 /* Terminal defaults to -Cq, non-terminal defaults to -1. */
169 if (isatty(STDOUT_FILENO)) {
[15e8/188d6]: ::PopIOHandler top iohandler = 0x808cc2300
[15e8/188d6]: ::PopIOHandler popped, new top = 0x808d34340
So it looks like PrivateGetLine is executing simultaneously with the
IOHandler manipulation, and manages to output its prompt before it's
actually deactivated. (Interestingly this looks like it happens at
the same time as the inferior process trace trap callback is
executing, too.)
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