// Copyright 2021 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.

#include "_cgo_export.h"

void lockOSThreadC(void) {
	lockOSThreadCallback();
}

void issue7978c(uint32_t *sync) {
	while(__atomic_load_n(sync, __ATOMIC_SEQ_CST) != 0)
		;
	__atomic_add_fetch(sync, 1, __ATOMIC_SEQ_CST);
	while(__atomic_load_n(sync, __ATOMIC_SEQ_CST) != 2)
		;

	// there are two levels of internal runtime lock
	// (1 for init, 1 for cgo).
	// This would have been broken by CL 11663043.
	C.lockOSThreadC()
}

func test3775(t *testing.T) {
	if runtime.GOOS == "android" {
		return
	}
	// Used to panic because of the UnlockOSThread below.
	C.lockOSThreadC()
}

//export lockOSThreadCallback
func lockOSThreadCallback() {
	runtime.LockOSThread()
	runtime.UnlockOSThread()