func BenchmarkCgoCall(b *testing.B)      { benchCgoCall(b) }
func BenchmarkGoString(b *testing.B)     { benchGoString(b) }
func BenchmarkCGoCallback(b *testing.B)  { benchCallback(b) }

		t.Fatalf("sum=%d, want %d", sum.i, want)
	}
}

// Benchmark measuring overhead from C to Go in a C thread.
// Create a new C thread and invoke Go function repeatedly in the new C thread.
func benchCGoInCthread(b *testing.B) {
	n := C.callGoInCThread(C.int(b.N))
	if int(n) != b.N {
		b.Fatal("unmatch loop times")
	}
}

// issue 1328

//export BackIntoGo
func BackIntoGo() {
	x := 1