bug#9010: sigprocmask -> pthread_sigmask for Emacs

[Jan Djärv]

Hello.

Paul Eggert skrev 2011-07-06 20.11:
> Currently Emacs uses sigprocmask to alter signal masks, but
> sigprocmask is portable only for single-threaded applications, and
> Emacs can be multithreaded when it uses GTK (and is likely to
> become more multithreaded in the future).  I've seen bug reports
> about this for other apps, in which misuse of sigprocmask (where
> pthread_sigmask should be used) causes segfaults and the like.  I
> haven't reproduced the problem with GNU Emacs but any such bugs
> would quite possibly be random crashes that don't seem to be
> related to sigprocmask.

This looks ok, as long as all signal handlers have SIGNAL_THREAD_CHECK at the 
beginning (they currently do).

        Jan D.