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runtime: don't block signals that will kill the program

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Otherwise we may delay the delivery of these signals for an arbitrary
length of time. We are already careful to not block signals that the
program has asked to see.

Also make sure that we don't miss a signal delivery if a thread
decides to stop for a while while executing the signal handler.

Also clean up the TestAtomicStop output a little bit.

Fixes #21433

Change-Id: Ic0c1a4eaf7eba80d1abc1e9537570bf4687c2434
Reviewed-on: https://go-review.googlesource.com/79581
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Ian Lance Taylor 2017-11-22 19:12:12 -08:00
parent b23096b514
commit eb97160f46
4 changed files with 50 additions and 13 deletions
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2
src/runtime/runtime2.go
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@ -622,7 +622,7 @@ const (
_SigDefault // if the signal isn't explicitly requested, don't monitor it
_SigGoExit // cause all runtime procs to exit (only used on Plan 9).
_SigSetStack // add SA_ONSTACK to libc handler
_SigUnblock // unblocked in minit
_SigUnblock // always unblock; see blockableSig
_SigIgn // _SIG_DFL action is to ignore the signal
)