[lttng-dev] SIG33 message

[mathieu.desnoyers@efficios.com (Mathieu Desnoyers)]

----- On Apr 4, 2019, at 3:26 PM, Mosleh Uddin <mosleh1235 at gmail.com> wrote: 

> Hello,
> I am building an application which I am compiling with the 'lttng-ust' flag.
> When I try to debug the application using gdb, I get a 'Suspended: Signal:
> SIG33:Real-time event 33' message. This only happens when I compile with the
> 'lttng-ust' flag, if I remove it I no longer have this issue. Any insight?

Hi, 

Based on the signal(7) man page, it appears that real-time signal 33 is used by the NPTL 
threading library from glibc. 

Indeed, lttng-ust creates 2 threads within the processes it's linked into, so 
your application needs to appropriately interact with glibc NPTL in order to link 
lttng-ust into it. 

Can you provide more details on the nature of your application ? What version 
of gdb do you use ? On which architecture ? 

Thanks, 

Mathieu 

-- 
Mathieu Desnoyers 
EfficiOS Inc. 
http://www.efficios.com 
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