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runtime: fix NetBSD CPU spin in lwp_park when CPU profiling is active

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Fixes #22981

Change-Id: I449eb7b5e022401e80a3ab138063e2f4499fbdf8
Reviewed-on: https://go-review.googlesource.com/81855
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Christos Zoulas 2017-12-04 23:50:19 +00:00 • committed by Brad Fitzpatrick
parent 9d70b3ae04
commit 2ff2eab0d2
1 changed files with 10 additions and 1 deletions
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11
src/runtime/os_netbsd.go
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@ -122,8 +122,8 @@ func semasleep(ns int64) int32 {
// Compute sleep deadline.
var tsp *timespec
var ts timespec
if ns >= 0 {
var ts timespec
var nsec int32
ts.set_sec(timediv(ns, 1000000000, &nsec))
ts.set_nsec(nsec)
@ -143,6 +143,15 @@ func semasleep(ns int64) int32 {
ret := lwp_park(_CLOCK_MONOTONIC, _TIMER_RELTIME, tsp, 0, unsafe.Pointer(&_g_.m.waitsemacount), nil)
if ret == _ETIMEDOUT {
return -1
} else if ret == _EINTR && ns >= 0 {
// Avoid sleeping forever if we keep getting
// interrupted (for example by the profiling
// timer). It would be if tsp upon return had the
// remaining time to sleep, but this is good enough.
var nsec int32
ns /= 2
ts.set_sec(timediv(ns, 1000000000, &nsec))
ts.set_nsec(nsec)
}
}
}