You iterate over all the threads and ask each thread what its stop reason is.
> On Mar 18, 2016, at 4:25 PM, Jeffrey Tan via lldb-dev
> <lldb-dev@lists.llvm.org> wrote:
>
>
> Hmm, interesting, I got the stop reason from the
> lldb.SBProcess.GetProcessFromEvent(event).GetSelectedThread().GetStopReason().
> Is that thread not the one that stopped? But you are right, the breakpoint
> hits in another thread:
>
> thread #87: tid = 1006769, 0x000000000042eacd
> biggrep_master_server_async`facebook::biggrep::BigGrepMasterAsync::future_find(this=0x00007f3ea2d74fd0,
> corpus=error: summary string parsing error, needle=error: summary string
> parsing error, options=0x00007f3e899fc7e0) + 51 at
> BigGrepMasterAsync.cpp:171, name = 'BigGrep-pri3-32', stop reason =
> breakpoint 1.1
>
> How do I know which thread hits the breakpoint?
>
> Jeffrey
>
>
> On Fri, Mar 18, 2016 at 4:12 PM, Jim Ingham <jing...@apple.com> wrote:
> You only show one thread in your example. Did another thread have a valid
> stop reason? lldb shouldn’t be stopping for no reason anywhere…
>
> Jim
>
>> On Mar 18, 2016, at 4:08 PM, Jeffrey Tan via lldb-dev
>> <lldb-dev@lists.llvm.org> wrote:
>>
>> Btw: the breakpoint I set is:
>> "b BigGrepMasterAsync.cpp:171" which is not in any of the stopped stack
>> frames.
>>
>> On Fri, Mar 18, 2016 at 3:47 PM, Jeffrey Tan <jeffrey.fu...@gmail.com> wrote:
>> Hi,
>>
>> Our IDE(wrapping lldb using python) works fine on Linux for simple hello
>> world cases. While trying a real world case, I found whenever we set a
>> source line breakpoint, then trigger the code path, lldb will send a stopped
>> state process event, with thread.GetStopReason() being None and with weird
>> callstack. Any ideas why do I get this stop stack(code is listed at the
>> end)? I have verified that if I do not set breakpoint and trigger the same
>> code path does not cause this stop event to generate.
>>
>> bt
>> * thread #1: tid = 952490, 0x00007fd7cb2daa83 libc.so.6`__GI_epoll_wait +
>> 51, name = 'biggrep_master_'
>> * frame #0: 0x00007fd7cb2daa83 libc.so.6`__GI_epoll_wait + 51
>> frame #1: 0x000000000271189f
>> biggrep_master_server_async`epoll_dispatch(base=0x00007fd7ca970800,
>> arg=0x00007fd7ca62c1e0, tv=<unavailable>) + 127 at epoll.c:315
>> frame #2: 0x000000000270f6d1
>> biggrep_master_server_async`event_base_loop(base=0x00007fd7ca970800,
>> flags=<unavailable>) + 225 at event.c:524
>> frame #3: 0x00000000025f9378
>> biggrep_master_server_async`folly::EventBase::loopBody(this=0x00007fd7ca945180,
>> flags=0) + 834 at EventBase.cpp:335
>> frame #4: 0x00000000025f900b
>> biggrep_master_server_async`folly::EventBase::loop(this=0x00007fd7ca945180)
>> + 29 at EventBase.cpp:287
>> frame #5: 0x00000000025fa053
>> biggrep_master_server_async`folly::EventBase::loopForever(this=0x00007fd7ca945180)
>> + 109 at EventBase.cpp:435
>> frame #6: 0x0000000001e24b72
>> biggrep_master_server_async`apache::thrift::ThriftServer::serve(this=0x00007fd7ca96d710)
>> + 110 at ThriftServer.cpp:365
>> frame #7: 0x00000000004906bc
>> biggrep_master_server_async`facebook::services::ServiceFramework::startFramework(this=0x00007ffc06776140,
>> waitUntilStop=true) + 1942 at ServiceFramework.cpp:885
>> frame #8: 0x000000000048fe6d
>> biggrep_master_server_async`facebook::services::ServiceFramework::go(this=0x00007ffc06776140,
>> waitUntilStop=true) + 35 at ServiceFramework.cpp:775
>> frame #9: 0x00000000004219a7 biggrep_master_server_async`main(argc=1,
>> argv=0x00007ffc067769d8) + 2306 at BigGrepMasterServerAsync.cpp:134
>> frame #10: 0x00007fd7cb1ed0f6 libc.so.6`__libc_start_main + 246
>> frame #11: 0x0000000000420bfc biggrep_master_server_async`_start + 41 at
>> start.S:122
>>
>> Here is the code snippet of handling code:
>> def _handle_process_event(self, event):
>> # Ignore non-stopping events.
>> if lldb.SBProcess.GetRestartedFromEvent(event):
>> log_debug('Non stopping event: %s' % str(event))
>> return
>>
>> process = lldb.SBProcess.GetProcessFromEvent(event)
>> if process.state == lldb.eStateStopped:
>> self._send_paused_notification(process)
>> elif process.state == lldb.eStateExited:
>> exit_message = 'Process(%d) exited with: %u' % (
>> process.GetProcessID(),
>> process.GetExitStatus())
>> if process.GetExitDescription():
>> exit_message += (', ' + process.GetExitDescription())
>> self._send_user_output('log', exit_message)
>> self.should_quit = True
>> else:
>> self._send_notification('Debugger.resumed', None)
>>
>> event_type = event.GetType()
>> if event_type == lldb.SBProcess.eBroadcastBitSTDOUT:
>> # Read stdout from inferior.
>> process_output = ''
>> while True:
>> output_part = process.GetSTDOUT(1024)
>> if not output_part or len(output_part) == 0:
>> break
>> process_output += output_part
>> self._send_user_output('log', process_output)
>>
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>
>
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