wip

keyedmutex/keyedmutex_test.go

@@ -0,0 +1,123 @@
+package keyedmutex
+
+
+import (
+	"sync"
+	"testing"
+	"time"
+)
+
+func TestKeyedMutex(t *testing.T) {
+	checkState := func(t *testing.T, m KeyedMutex[string], keys ...string) {
+		if len(m.waitList) != len(keys) {
+			t.Fatal(m.waitList, keys)
+		}
+
+		for _, key := range keys {
+			if _, ok := m.waitList[key]; !ok {
+				t.Fatal(key)
+			}
+		}
+	}
+
+	m := New[string]()
+	checkState(t, m)
+
+	m.Lock("a")
+	checkState(t, m, "a")
+	m.Lock("b")
+	checkState(t, m, "a", "b")
+	m.Lock("c")
+	checkState(t, m, "a", "b", "c")
+
+	if m.TryLock("a") {
+		t.Fatal("a")
+	}
+	if m.TryLock("b") {
+		t.Fatal("b")
+	}
+	if m.TryLock("c") {
+		t.Fatal("c")
+	}
+
+	if !m.TryLock("d") {
+		t.Fatal("d")
+	}
+
+	checkState(t, m, "a", "b", "c", "d")
+
+	if !m.TryLock("e") {
+		t.Fatal("e")
+	}
+	checkState(t, m, "a", "b", "c", "d", "e")
+
+	m.Unlock("c")
+	checkState(t, m, "a", "b", "d", "e")
+	m.Unlock("a")
+	checkState(t, m, "b", "d", "e")
+	m.Unlock("e")
+	checkState(t, m, "b", "d")
+
+	wg := sync.WaitGroup{}
+	for i := 0; i < 8; i++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			m.Lock("b")
+			m.Unlock("b")
+		}()
+	}
+
+	time.Sleep(100 * time.Millisecond)
+	m.Unlock("b")
+	wg.Wait()
+
+	checkState(t, m, "d")
+
+	m.Unlock("d")
+	checkState(t, m)
+}
+
+func TestKeyedMutex_unlockUnlocked(t *testing.T) {
+	defer func() {
+		if r := recover(); r == nil {
+			t.Fatal(r)
+		}
+	}()
+
+	m := New[string]()
+	m.Unlock("aldkfj")
+}
+
+func BenchmarkUncontendedMutex(b *testing.B) {
+	m := New[string]()
+	key := "xyz"
+
+	for i := 0; i < b.N; i++ {
+		m.Lock(key)
+		m.Unlock(key)
+	}
+}
+
+func BenchmarkContendedMutex(b *testing.B) {
+	m := New[string]()
+	key := "xyz"
+
+	m.Lock(key)
+
+	wg := sync.WaitGroup{}
+	for i := 0; i < b.N; i++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			m.Lock(key)
+			m.Unlock(key)
+		}()
+	}
+
+	time.Sleep(time.Second)
+
+	b.ResetTimer()
+	m.Unlock(key)
+	wg.Wait()
+}