Readline: Signals get re-sent to the wrong thread

[Wolfgang Thaller]

When readline catches a signal, it often passes it on to the 
application. However, the signal can get passed on to the _wrong 
thread_. This doesn't matter for most applications, but when 
applications use pthread_kill specifically, this can become (almost) a 
show-stopper.

In the file signal.c, the signal is sent on using:

kill (getpid (), sig);

This resends the signal to the "any" thread of the application; what I 
would prefer is the following:

pthread_kill(pthread_self(), sig);

On Linux, where each thread has it's own PID, the two are equivalent, 
but on Mac OS X, the second passes the signal on correctly; in the 
first case, the signal might end up being handled by a different 
thread.

Cheers,

Wolfgang