@itemize
@item
This function is missing on some platforms:
-HP-UX 11, IRIX 5.3, Solaris 2.4, mingw, BeOS.
+HP-UX 11.11, IRIX 5.3, Solaris 2.4, mingw, BeOS.
@item
On Linux/glibc platforms before the advent of NPTL, signals could only be
sent to one particular thread. In POSIX, signals are sent to the entire