Pathc: Nagios threads

[Andreas Ericsson]

Ahoy.

I've just noticed that Nagios doesn't define _REENTRANT or _THREAD_SAFE 
anywhere, although glibc and linuxthreads requires it to make functions 
thread safe. I'm not sure what difference it makes on some systems, but 
I've got a hunch it might mitigate the crash in 
service_result_worker_threads which seems to happen on SMP-enabled 
systems (where system calls can actually happen at the same time) using 
an older version of glibc (2.1.3) and its corresponding linuxthreads 
(also from 2000-something).

Apply the patch with
patch -p1 < nagios-threadsafe.diff
and please test this on other systems, as I'm not sure it works with 
Solaris and friends that have a history of broken system headers.
BSD systems should have no problems with it.

Cheers.

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Lead Developer
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