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From: Bill Paul <wpaul@FreeBSD.ORG>
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Date: Fri, 6 Mar 1998 21:06:13 -0800 (PST)
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To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG, cvs-lib@FreeBSD.ORG
Subject: cvs commit: src/lib/libc/yp yplib.c
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wpaul       1998/03/06 21:06:12 PST

  Modified files:
    lib/libc/yp          yplib.c 
  Log:
  Fix resource allocation problems:
  
  - Completely recoded the ypmatch cache code. The old code could leak
    memory: it would allow the cache to grow, but never
    shrink. The new code imposes the following limits:
  
  	o The cache is capped at a limit of 5 entries.
  	o Each entry expires after five seconds, at which point
  	  its slot is freed.
  	o If an insertion is to be done and all five slots
  	  are filled, the oldest entry is forcibly expired
  	  to release its slot.
  
    Also, the cache is implemented on a per-binding basis rather than
    having a global cache covering all bindings. This means that each
    bound domain has its own 5 slot cache.
  
  - Changed clntudp_create() to clntudp_bufcreate() so that the
    xmit/recv message buffer sizes can be set explicitly. NIS transactions
    are rarely much larger than 1024 bytes since YPMAXRECORD is 1024.
    The defaults chosen by clntudb_create() are actually much larger
    than needed. I set the xmit buffer to a little over 1024 and the
    recv buffer to a little over 2048. This saves a few Kbytes for each
    NIS binding.
  
  - Add my name to the copyright. I think I've made enough changes to
    this file to merit it. :)
  
  Note: these changes should go into the 2.2.x branch, but I'm waiting
  on feedback from a tester to see if the cache fixes solve the reported
  memory leak problem.
  
  Revision  Changes    Path
  1.30      +178 -96   src/lib/libc/yp/yplib.c

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