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Suppose I'm a library wanting to register a pthread_atfork handler. Contrary to 
what the function name might suggest, this makes perfect sense in a 
non-threaded environment. So pthread_atfork is available in libc.
Now, if I'm being called in a multithreaded environment, I should probably use 
pthread_once to register my handlers. However, pthread_once is only available 
in libpthread.
So what to do (other than linking against libpthread)? Is there a way to 
conditionally, based on whether the main program is single- or multithreaded, 
either call pthread_once or simply register the pthread_atfork handlers 

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