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runtime: avoid receiving preemotion signal while exec'ing

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The iOS kernel has the same problem as the macOS kernel. Extend
the workaround of #41702 (CL 262438 and CL 262817) to iOS.

Updates #35851.

Change-Id: I7ccec00dc96643c08c5be8b385394856d0fa0f64
Reviewed-on: https://go-review.googlesource.com/c/go/+/275293
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Cherry Zhang 2020-12-03 16:53:30 -05:00
parent 7358064508
commit 21cfadf0dc
2 changed files with 7 additions and 7 deletions
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4
src/runtime/proc.go
View File

@ -1363,7 +1363,7 @@ found:
checkdead()
unlock(&sched.lock)
if GOOS == "darwin" {
if GOOS == "darwin" || GOOS == "ios" {
// Make sure pendingPreemptSignals is correct when an M exits.
// For #41702.
if atomic.Load(&m.signalPending) != 0 {
@ -3852,7 +3852,7 @@ func syscall_runtime_BeforeExec() {
// On Darwin, wait for all pending preemption signals to
// be received. See issue #41702.
if GOOS == "darwin" {
if GOOS == "darwin" || GOOS == "ios" {
for int32(atomic.Load(&pendingPreemptSignals)) > 0 {
osyield()
}

10
src/runtime/signal_unix.go
View File

@ -336,7 +336,7 @@ func doSigPreempt(gp *g, ctxt *sigctxt) {
atomic.Xadd(&gp.m.preemptGen, 1)
atomic.Store(&gp.m.signalPending, 0)
if GOOS == "darwin" {
if GOOS == "darwin" || GOOS == "ios" {
atomic.Xadd(&pendingPreemptSignals, -1)
}
}
@ -352,12 +352,12 @@ const preemptMSupported = true
func preemptM(mp *m) {
// On Darwin, don't try to preempt threads during exec.
// Issue #41702.
if GOOS == "darwin" {
if GOOS == "darwin" || GOOS == "ios" {
execLock.rlock()
}
if atomic.Cas(&mp.signalPending, 0, 1) {
if GOOS == "darwin" {
if GOOS == "darwin" || GOOS == "ios" {
atomic.Xadd(&pendingPreemptSignals, 1)
}
@ -369,7 +369,7 @@ func preemptM(mp *m) {
signalM(mp, sigPreempt)
}
if GOOS == "darwin" {
if GOOS == "darwin" || GOOS == "ios" {
execLock.runlock()
}
}
@ -432,7 +432,7 @@ func sigtrampgo(sig uint32, info *siginfo, ctx unsafe.Pointer) {
// no non-Go signal handler for sigPreempt.
// The default behavior for sigPreempt is to ignore
// the signal, so badsignal will be a no-op anyway.
if GOOS == "darwin" {
if GOOS == "darwin" || GOOS == "ios" {
atomic.Xadd(&pendingPreemptSignals, -1)
}
return