Subject: Set thread names to assist debugging
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On some operating systems it's possible to set the name of a thread as displayed by 'ps', etc.  For example on Linux this requires the (non-portable) pthread_setname_np() function.

Since the threads are all managed in libisc I suggest that the threads should be given names thus:

    isc-worker%04x
    isc-timer
    isc-sockmgr

[ the name length limit on Linux is 16 chars, including the terminating NUL]