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From: Julian Elischer <julian@FreeBSD.ORG>
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Date: Thu, 7 Jan 1999 13:23:52 -0800 (PST)
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To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG
Subject: cvs commit: src/sys/kern init_main.c kern_exit.c kern_fork.c
         src/sys/sys proc.h signalvar.h unistd.h user.h src/sys/vm
         vm_glue.c
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julian      1999/01/07 13:23:51 PST

  Modified files:
    sys/kern             init_main.c kern_exit.c kern_fork.c 
    sys/sys              proc.h signalvar.h unistd.h user.h 
    sys/vm               vm_glue.c 
  Log:
  Changes to the LINUX_THREADS support to only allocate extra memory for
  shared signal handling when there is shared signal handling being
  used.
  
  This removes the main objection to making the shared signal handling
  a standard ability in rfork() and friends and 'unconditionalising'
  this code. (i.e. the allocation of an extra 328 bytes per process).
  
  Signal handling information remains in the U area until such a time as
  it's reference count would be incremented to > 1. At that point a new
  struct is malloc'd and maintained in KVM so that it can be shared between
  the processes (threads) using it.
  
  A function to check the reference count and move the struct back to the U
  area when it drops back to 1 is also supplied. Signal information is
  therefore now swapable for all processes that are not sharing that
  information with other processes. THis should addres the concerns raised
  by Garrett and others.
  
  Submitted by:	"Richard Seaman, Jr." <dick@tar.com>
  
  Revision  Changes    Path
  1.103     +1 -11     src/sys/kern/init_main.c
  1.71      +26 -17    src/sys/kern/kern_exit.c
  1.54      +28 -8     src/sys/kern/kern_fork.c
  1.66      +10 -15    src/sys/sys/proc.h
  1.22      +4 -2      src/sys/sys/signalvar.h
  1.19      +1 -2      src/sys/sys/unistd.h
  1.18      +1 -5      src/sys/sys/user.h
  1.80      +10 -1     src/sys/vm/vm_glue.c

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