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Date: Thu, 20 Feb 1997 03:51:54 -0800 (PST)
From: Bruce Evans <bde>
Message-Id: <199702201151.DAA07900@freefall.freebsd.org>
To: CVS-committers, cvs-all, cvs-sys
Subject: cvs commit:  src/sys/kern sys_generic.c
Sender: owner-cvs-sys@FreeBSD.ORG
X-Loop: FreeBSD.org
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bde         97/02/20 03:51:53

  Modified:    sys/kern  sys_generic.c
  Log:
  Improved select():
  - avoid malloc() if the number of fds is small.
  - pack the bits better so that `small' is quite large.
  - don't waste time generating zero bits for null fd_set pointers or
    scanning these bits.
  
  Possibly improved select():
  - free malloc()ed storage before returning.  This is simpler and I
    think huge select()s aren't worth optimizing since they are rare,
    relative gain would be small and there would be tiny costs for all
    selects().
  
  Reviewed by:	ache (first version by him too)
  
  Revision  Changes    Path
  1.22      +51 -36    src/sys/kern/sys_generic.c