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From: Poul-Henning Kamp <phk@FreeBSD.org>
Date: Thu, 30 Sep 2004 07:04:03 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
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X-FreeBSD-CVS-Branch: HEAD
Subject: cvs commit: src/sys/sys systm.h src/sys/conf files src/sys/kern
 subr_unit.c
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phk         2004-09-30 07:04:03 UTC

  FreeBSD src repository

  Modified files:
    sys/sys              systm.h 
    sys/conf             files 
  Added files:
    sys/kern             subr_unit.c 
  Log:
  Add a new API for allocating unit number (-like) resources.
  
  Allocation is always lowest free unit number.
  
  A mixed range/bitmap strategy for maximum memory efficiency.  In
  the typical case where no unit numbers are freed total memory usage
  is 56 bytes on i386.
  
  malloc is called M_WAITOK but no locking is provided (yet).  A bit of
  experience will be necessary to determine the best strategy.  Hopefully
  a "caller provides locking" strategy can be maintained, but that may
  require use of M_NOWAIT allocation and failure handling.
  
  A userland test driver is included.
  
  Revision  Changes    Path
  1.955     +1 -0      src/sys/conf/files
  1.1       +597 -0    src/sys/kern/subr_unit.c (new)
  1.215     +8 -0      src/sys/sys/systm.h