How to debug a signal handler with gdb?

[Vincent]

Hello!

I'm using QNX Neutrino.

I wrote a muti-threaded application where a thread sends a SIGUSR1 signal to
an other thread using pthread_kill().

The handler was previously installed using signal() function.

When I run the program it works, but when I run it from gdb the signal seems
to be ignored and the handler is not called.

Any idea?

Vincent.