* [9fans] NSAVE/NRSTR use case in libap
@ 2017-05-03 15:15 Giacomo Tesio
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From: Giacomo Tesio @ 2017-05-03 15:15 UTC (permalink / raw)
To: Fans of the OS Plan 9 from Bell Labs
Reading notify(2) I've noticed that I do not understand POSIX signals
enough to grasp the problem NSAVE/NRSTR are designed to solve.
Initially I supposed they where supposed to allow nested signals, so
that a note occurred during the execution of a signal handler wont
need to wait for NCONT.
Thus I suppose that I'm missing something: I can't imagine a (non
real-time) program requiring to handle a signal while handling a
signal.
So my questions are:
- why Plan 9 needs NSAVE/NRSTR? Which ANSI/POSIX semantics are they
designed to help with?
- can you point me to an application actually using such semantics
(either ported to Plan9 or not).
Giacomo
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2017-05-03 15:15 [9fans] NSAVE/NRSTR use case in libap Giacomo Tesio
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