git: DragonFly_RELEASE_4_6 kernel - Be nicer to pthreads in vfork()

[Matthew Dillon]

commit de4095f1f94fa072173dba0414f4338348149473
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Thu Jul 28 10:12:39 2016 -0700

    kernel - Be nicer to pthreads in vfork()
    
    * When vfork()ing, give the new sub-process's lwp the same TID as the one
      that called vfork().  Even though user processes are not supposed to do
      anything sophisticated inside a vfork() prior to exec()ing, some things
      such as fileno() having to lock in a threaded environment might not be
      apparent to the programmer.
    
    * By giving the sub-process the same TID, operations done inside the
      vfork() prior to exec that interact with pthreads will not confuse
      pthreads and cause corruption due to e.g. TID 0 clashing with TID 0
      running in the parent that is running concurrently.

Summary of changes:
 sys/kern/kern_fork.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/de4095f1f94fa072173dba0414f4338348149473


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