Fix hang with warning message from opening non-existant file with check.if.already.open=1 by adding thread calls inside signal handler.
Fix hang with warning message from opening non-existant file with check.if.already.open=1
by adding thread calls inside signal handler.

R1dO/scite_clone,R1dO/scite_clone,R1dO/scite_clone,R1dO/scite_clone