// 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

//
// Note that bionic does not provide getcontext either, but that is skipped via
// the android build tag.
#if defined(__linux__) && !defined(__GLIBC__)
#define MUSL 1
#endif
#if defined(MUSL)
void callStackSwitchCallbackFromThread(void) {
	printf("SKIP\n");
	exit(0);
}
#else

// Use a stack size larger than the 32kb estimate in
// runtime.callbackUpdateSystemStack. This ensures that a second stack