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Re: kern/49017: vfork does not suspend all threads

The following reply was made to PR kern/49017; it has been noted by GNATS.

From: Joerg Sonnenberger <>
To: Christos Zoulas <>
Subject: Re: kern/49017: vfork does not suspend all threads
Date: Wed, 5 Apr 2017 23:03:19 +0200

 On Wed, Apr 05, 2017 at 04:38:32PM -0400, Christos Zoulas wrote:
 >     Can the other threads harm the child or the parent while it is vfork()ing?
 > I can't think of a way.
 Race conditions in mutex code. Keep in mind that the park/unpark events
 are per-process.
 I fully support the proposal to block all threads in the parent. If you
 want to create child processes from multi-threaded programs and care at
 all about performance, use posix_spawn. How it is implemented is an
 implementation detail and independent of vfork.

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