Re: [Xen-devel] [PATCH 00/12] libxl: fork: SIGCHLD flexibility

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Jim Fehlig writes ("Re: [Xen-devel] [PATCH 00/12] libxl: fork: SIGCHLD 
flexibility"):
...
> It looks like libxl is waiting for a read with a ctx locked on thread 5,
> then receives an occurred_fd event on the same ctx in thread 1.  But it
> is not clear to me why read() is blocking...

Presumably the sigchld handler (bottom half) lost the race with a
previous instance of the sigchld_selfpipe_handler (top half), causing
sigchld_selfpipe_handler to run when the pipe was in fact empty.

And the real bug is that nothing sets the pipe to nonblocking!
Bear with me.

Ian.

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