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runtime: don't return from netpollGenericInit until init is complete

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As a side-effect ensure that netpollinited only reports true when
netpoll initialization is complete.

Fixes #35282
Updates #35353

Change-Id: I21f08a04fcf229e0de5e6b5ad89c990426ae9b89
Reviewed-on: https://go-review.googlesource.com/c/go/+/204937
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Ian Lance Taylor 2019-11-01 16:31:57 -07:00
parent 4af639a568
commit 04e80fb2c9
1 changed files with 10 additions and 3 deletions
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13
src/runtime/netpoll.go
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@ -93,7 +93,9 @@ type pollCache struct {
}
var (
netpollInited uint32
netpollInitLock mutex
netpollInited uint32
pollcache pollCache
netpollWaiters uint32
)
@ -104,8 +106,13 @@ func poll_runtime_pollServerInit() {
}
func netpollGenericInit() {
if atomic.Cas(&netpollInited, 0, 1) {
netpollinit()
if atomic.Load(&netpollInited) == 0 {
lock(&netpollInitLock)
if netpollInited == 0 {
netpollinit()
atomic.Store(&netpollInited, 1)
}
unlock(&netpollInitLock)
}
}