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runtime: test a frameless function for async preemption

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Frameless function is an interesting case for call injection
espcially for LR architectures. Extend the test for this case.

Change-Id: I074090d09eeaf642e71e3f44fea216f66d39b817
Reviewed-on: https://go-review.googlesource.com/c/go/+/202339
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Cherry Zhang 2019-10-20 17:24:14 -04:00
parent a866b48e4a
commit 11db7e4469
1 changed files with 18 additions and 2 deletions
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20
src/runtime/testdata/testprog/preempt.go vendored
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@ -22,16 +22,23 @@ func AsyncPreempt() {
debug.SetGCPercent(-1)
// Start a goroutine with no sync safe-points.
var ready uint32
var ready, ready2 uint32
go func() {
for {
atomic.StoreUint32(&ready, 1)
}
}()
// Also start one with a frameless function.
// This is an especially interesting case for
// LR machines.
go func() {
atomic.StoreUint32(&ready2, 1)
frameless()
}()
// Wait for the goroutine to stop passing through sync
// safe-points.
for atomic.LoadUint32(&ready) == 0 {
for atomic.LoadUint32(&ready) == 0 || atomic.LoadUint32(&ready2) == 0 {
runtime.Gosched()
}
@ -42,3 +49,12 @@ func AsyncPreempt() {
println("OK")
}
//go:noinline
func frameless() {
for i := int64(0); i < 1<<62; i++ {
out += i
}
}
var out int64