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runtime: convert schedt.lastpoll to atomic type

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Note that this changes the type from uint64 to int64, the type used by
nanotime(). It also adds an atomic load in pollWork(), which used to use
a non-atomic load.

For #53821.

Change-Id: I6173c90f20bfdc0e0a4bc3a7b1c798d1c429fff5
Reviewed-on: https://go-review.googlesource.com/c/go/+/419442
Run-TryBot: Michael Pratt <mpratt@google.com>
Reviewed-by: Austin Clements <austin@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Michael Pratt 2022-07-20 17:39:12 -04:00
parent 98e1648823
commit 5d7d50111f
3 changed files with 10 additions and 11 deletions
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2
src/runtime/runtime2.go
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@ -760,7 +760,7 @@ type p struct {
type schedt struct {
// accessed atomically. keep at top to ensure alignment on 32-bit systems.
goidgen atomic.Uint64
lastpoll uint64 // time of last network poll, 0 if currently polling
lastpoll atomic.Int64 // time of last network poll, 0 if currently polling
pollUntil uint64 // time to which current poll is sleeping
lock mutex