Messages in this thread | | | Date | Wed, 14 Aug 2019 18:34:44 +0200 | From | Christian Brauner <> | Subject | Re: [PATCH v3 1/1] waitid: Add support for waiting for the current process group |
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On Wed, Aug 14, 2019 at 06:15:17PM +0200, Christian Brauner wrote: > On Wed, Aug 14, 2019 at 06:09:17PM +0200, Oleg Nesterov wrote: > > On 08/14, Christian Brauner wrote: > > > > > > and a signal could come in between the system call that > > > retrieved the process gorup and the call to waitid that changes the > > ^^^^^ > > > current process group. > > > > I noticed this typo only because I spent 2 minutes or more trying to > > understand this sentence ;) But yes, a signal handler or another thread > > I'll try to rewrite it. :)
Ok, here's what I changed it to:
It was recently discovered that the linux version of waitid is not a superset of the other wait functions because it does not include support for waiting for the current process group. This has two downsides: 1. An extra system call is needed to get the current process group. 2. After the current process group is received and before it is passed to waitid a signal could arrive causing the current process group to change.
Christian
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