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runtime: don't preempt if preemption is disabled

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If asyncpreemptoff is set, don't preempt upon receiving a SIGURG.

Fixes #38531.

Change-Id: I6d9a828b45c199d3e479cbdfe17a896a40d540f9
Reviewed-on: https://go-review.googlesource.com/c/go/+/240121
Run-TryBot: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Cherry Zhang 2020-06-26 11:57:08 -04:00
parent c143a5f2a6
commit d1015f3e58
1 changed files with 1 additions and 1 deletions
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2
src/runtime/signal_unix.go
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@ -536,7 +536,7 @@ func sighandler(sig uint32, info *siginfo, ctxt unsafe.Pointer, gp *g) {
return
}
if sig == sigPreempt {
if sig == sigPreempt && debug.asyncpreemptoff == 0 {
// Might be a preemption signal.
doSigPreempt(gp, c)
// Even if this was definitely a preemption signal, it