cThreadToM = map[uintptr]uintptr{}
	started    = atomic.Uint32{}
)

// same as CTHREADS in C, make sure all the C threads are actually started.
const cThreadNum = 2

func init() {
	register("EnsureBindM", EnsureBindM)
}

//export GoCheckBindM
func GoCheckBindM(thread uintptr) {
	// Wait all threads start
	if started.Load() != cThreadNum {
		// Only once for each thread, since it will wait all threads start.

}

func TestEnsureBindM(t *testing.T) {
	t.Parallel()
	switch runtime.GOOS {
	case "windows", "plan9":
		t.Skipf("skipping bindm test on %s", runtime.GOOS)
	}
	got := runTestProg(t, "testprogcgo", "EnsureBindM")
	want := "OK\n"
	if got != want {
		t.Errorf("expected %q, got %v", want, got)
	}
}

func TestStackSwitchCallback(t *testing.T) {
	t.Parallel()
	switch runtime.GOOS {