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From: Sean McNeil <sean@mcneil.com>
To: Daniel Eischen <eischen@vigrid.com>
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cc: David Xu <davidxu@freebsd.org>
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Subject: Re: signal handler priority issue
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> No, the problem is because SIGUSR2 is _not_ blocked.  I read
> "masked off" as "blocked" (the desired behavior).  If the
> signal handler runs, that means that the signal is not blocked.
> Your goal is to prevent the signal handler (for SIGUSR2) from
> running until sigsuspend() is hit.  Once sigsuspend() is hit,
> then SIGUSR2 becomes unblocked, the signal handler is run,
> and sigsuspend() returns.

This is exactly what boehm-gc is doing.  There must be something else
lurking in here that I've missed.  I have to keep looking at it.