jilles 0f4a2250a0 sigprocmask(2): pthread_sigmask(3) must be used in threaded processes.
Although libthr's pthread_sigmask() just calls sigprocmask() and this is
unlikely to change, mention this POSIX requirement on applications.

MFC after:	1 week
2010-05-07 20:46:22 +00:00
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