atomic bitset implementations of caps.Set and modes.ModeSet

irc/utils/bitset_test.go

@@ -0,0 +1,52 @@
+// Copyright (c) 2018 Shivaram Lingamneni <slingamn@cs.stanford.edu>
+// released under the MIT license
+
+package utils
+
+import "testing"
+
+type testBitset [2]uint64
+
+func TestSets(t *testing.T) {
+	var t1 testBitset
+	t1s := t1[:]
+	BitsetInitialize(t1s)
+
+	if BitsetGet(t1s, 0) || BitsetGet(t1s, 63) || BitsetGet(t1s, 64) || BitsetGet(t1s, 127) {
+		t.Error("no bits should be set in a newly initialized bitset")
+	}
+
+	var i uint
+	for i = 0; i < 128; i++ {
+		if i%2 == 0 {
+			BitsetSet(t1s, i, true)
+		}
+	}
+
+	if !(BitsetGet(t1s, 0) && !BitsetGet(t1s, 1) && BitsetGet(t1s, 64) && BitsetGet(t1s, 72) && !BitsetGet(t1s, 127)) {
+		t.Error("exactly the even-numbered bits should be set")
+	}
+
+	BitsetSet(t1s, 72, false)
+	if BitsetGet(t1s, 72) {
+		t.Error("remove doesn't work")
+	}
+
+	var t2 testBitset
+	t2s := t2[:]
+	BitsetInitialize(t2s)
+
+	for i = 0; i < 128; i++ {
+		if i%2 == 1 {
+			BitsetSet(t2s, i, true)
+		}
+	}
+
+	BitsetUnion(t1s, t2s)
+	for i = 0; i < 128; i++ {
+		expected := (i != 72)
+		if BitsetGet(t1s, i) != expected {
+			t.Error("all bits should be set except 72")
+		}
+	}
+}