[bde at FreeBSD.org: cvs commit: src/sys/kern kern_resource.c]

[Xin LI]

FYI,

----- Forwarded message from Bruce Evans <bde at xxxxxxxxxxx> -----

Date: Tue, 22 Jun 2004 04:38:08 +0000 (UTC)
From: Bruce Evans <bde at xxxxxxxxxxx>
	cvs-all at xxxxxxxxxxx
Subject: cvs commit: src/sys/kern kern_resource.c
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bde         2004-06-22 04:38:08 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_4)
    sys/kern             kern_resource.c 
  Log:
  Raise the ipl to splstatclock() in donice() before calling resetpriority().
  This fixes races with schedcpu() and schedclock().  It corresponds to
  sched locking before the sched_nice() call in -current.  Lock assertions
  made the races very obvious in -current.
  
  Adjust the process's priority after calling resetpriority() as in
  schedclock() to maintain the invariant that the current priority is
  always _the_ process's user priority if it is a user priority.  This
  is to support uncommitted assertions that the priority is correct on
  return to user mode.  The priority is correct here (modulo bugs
  elsewhere) but it needs to be set explicitly to satisfy the assertions.
  
  Revision  Changes    Path
  1.55.2.6  +5 -0      src/sys/kern/kern_resource.c
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Xin LI <delphij frontfree net>	http://www.delphij.net/
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