[Varnish] #609: use more efficient implementation for TIM_mono on Solaris (if gethrtime() exists)

[Varnish]

#609: use more efficient implementation for TIM_mono on Solaris (if gethrtime()
exists)
-------------------------+--------------------------------------------------
 Reporter:  slink        |       Owner:  phk  
     Type:  enhancement  |      Status:  new  
 Priority:  normal       |   Milestone:       
Component:  varnishd     |     Version:  trunk
 Severity:  normal       |    Keywords:       
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 I noticed that on (Open)Solaris, clock_gettime(CLOCK_MONOTONIC, ..) falls
 into a syscall, while neither clock_gettime(CLOCK_REALTIME, ..) nor
 gethrtime() need one.

 References:

  * http://cvs.opensolaris.org/source/xref/onnv/onnv-
 gate/usr/src/lib/libc/amd64/sys/__clock_gettime.s#33
  * http://cvs.opensolaris.org/source/s?defs=__clock_gettime&project=/onnv

 So, for the time being (until this is changed in (Open)Solaris), we save a
 systemcall by using gethrtime() for TIM_mono.

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Ticket URL: <http://varnish.projects.linpro.no/ticket/609>
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