How to determine the thread holding a mutex?

Philippe Waroquiers
Tue Jan 10 17:09:00 GMT 2017

On Tue, 2017-01-10 at 18:34 +0800, xxhdx1985126 wrote:
> Hi, everyone.
> I'm trying to debug a problem that appears to be a deadlock. I wonder 
> if I can use gdb to find out which thread is holding a mutex.
>  If so, my work would be much easier, as there are many threads in my program.

What you can do is to use valgrind --tool=helgrind 
to first see if valgrind helgrind tool does not point at a possible
culprit for the deadlock.

Assuming helgrind does not explain the bug, and assuming that the
deadlock reproduces under valgrind/helgrind,
you can use the valgrind gdbserver monitor command 'info locks'
to obtain the list of locks 

for more information.


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