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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build unix && !android && !openbsd
package main
/*
void callStackSwitchCallbackFromThread(void);
*/
import "C"
import (
"fmt"
"runtime/debug"
)
func init() {
register("StackSwitchCallback", StackSwitchCallback)
}
//export stackSwitchCallback
func stackSwitchCallback() {
// We want to trigger a bounds check on the g0 stack. To do this, we
// need to call a splittable function through systemstack().
// SetGCPercent contains such a systemstack call.
gogc := debug.SetGCPercent(100)
debug.SetGCPercent(gogc)
}
// Regression test for https://go.dev/issue/62440. It should be possible for C
// threads to call into Go from different stacks without crashing due to g0
// stack bounds checks.
//
// N.B. This is only OK for threads created in C. Threads with Go frames up the
// stack must not change the stack out from under us.
func StackSwitchCallback() {
C.callStackSwitchCallbackFromThread();
fmt.Printf("OK\n")
}
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