Re: [Bug 1104] New: signal delivery may lead to deadlock

[fche@xxxxxxxxxx (Frank Ch. Eigler)]

bugzilla-daemon@xxxxxxxxxxx writes:

> [...]  Frank has alluded to this in the past, see
> http://oss.sgi.com/bugzilla/show_bug.cgi?id=1069, so I guess it is
> time to go fix it, at least in this case.  [...]

Yeah, it's a textbook example.  I was thinking at one point that the
AF* functionality could be recast as something occurring synchronously
rather than asynchronously.  For example, we could define redefine the
__pmAF* functions so that callbacks occur only as/after libpcp
functions are about to return to the application.  (A new __pmAFwait()
could serve pmlogger's non-busy-looping.)

Such an implementation of AF* could still rely on signals internally,
but they'd just set a global flag for the deferred callback, and would
thus be safe.

- FChE