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runtime: convert runningPanicDefers to atomic type

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For #53821.

Change-Id: Ib48a1f2ff85d667c86dbd0b7662efab5a0abd837
Reviewed-on: https://go-review.googlesource.com/c/go/+/419437
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Michael Pratt 2022-07-14 17:29:29 -04:00
parent 40fa2dabe0
commit 7666ec1c99
2 changed files with 6 additions and 7 deletions
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9
src/runtime/panic.go
View File

@ -837,7 +837,7 @@ func gopanic(e any) {
p.link = gp._panic
gp._panic = (*_panic)(noescape(unsafe.Pointer(&p)))
atomic.Xadd(&runningPanicDefers, 1)
runningPanicDefers.Add(1)
// By calculating getcallerpc/getcallersp here, we avoid scanning the
// gopanic frame (stack scanning is slow...)
@ -917,7 +917,7 @@ func gopanic(e any) {
mcall(recovery)
throw("bypassed recovery failed") // mcall should not return
}
atomic.Xadd(&runningPanicDefers, -1)
runningPanicDefers.Add(-1)
// After a recover, remove any remaining non-started,
// open-coded defer entries, since the corresponding defers
@ -1067,9 +1067,8 @@ func fatal(s string) {
}
// runningPanicDefers is non-zero while running deferred functions for panic.
// runningPanicDefers is incremented and decremented atomically.
// This is used to try hard to get a panic stack trace out when exiting.
var runningPanicDefers uint32
var runningPanicDefers atomic.Uint32
// panicking is non-zero when crashing the program for an unrecovered panic.
// panicking is incremented and decremented atomically.
@ -1155,7 +1154,7 @@ func fatalpanic(msgs *_panic) {
// startpanic_m set panicking, which will
// block main from exiting, so now OK to
// decrement runningPanicDefers.
atomic.Xadd(&runningPanicDefers, -1)
runningPanicDefers.Add(-1)
printpanics(msgs)
}

4
src/runtime/proc.go
View File

@ -256,10 +256,10 @@ func main() {
// another goroutine at the same time as main returns,
// let the other goroutine finish printing the panic trace.
// Once it does, it will exit. See issues 3934 and 20018.
if atomic.Load(&runningPanicDefers) != 0 {
if runningPanicDefers.Load() != 0 {
// Running deferred functions should not take long.
for c := 0; c < 1000; c++ {
if atomic.Load(&runningPanicDefers) == 0 {
if runningPanicDefers.Load() == 0 {
break
}
Gosched()