fix: exit ticktock goroutine when pool is closed

pool.go

@@ -62,6 +62,9 @@ type Pool struct {
 	heartbeatDone int32
 	stopHeartbeat context.CancelFunc
 
+	ticktockDone int32
+	stopTicktock context.CancelFunc
+
 	now atomic.Value
 
 	options *Options
@@ -111,15 +114,44 @@ func (p *Pool) purgeStaleWorkers(ctx context.Context) {
 }
 
 // ticktock is a goroutine that updates the current time in the pool regularly.
-func (p *Pool) ticktock() {
+func (p *Pool) ticktock(ctx context.Context) {
 	ticker := time.NewTicker(nowTimeUpdateInterval)
-	defer ticker.Stop()
+	defer func() {
+		ticker.Stop()
+		atomic.StoreInt32(&p.ticktockDone, 1)
+	}()
+
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-ticker.C:
+		}
+
+		if p.IsClosed() {
+			break
+		}
 
-	for range ticker.C {
 		p.now.Store(time.Now())
 	}
 }
 
+func (p *Pool) startHeartbeat() {
+	// Start a goroutine to clean up expired workers periodically.
+	var ctx context.Context
+	ctx, p.stopHeartbeat = context.WithCancel(context.Background())
+	if !p.options.DisablePurge {
+		go p.purgeStaleWorkers(ctx)
+	}
+}
+
+func (p *Pool) startTicktock() {
+	p.now.Store(time.Now())
+	var ctx context.Context
+	ctx, p.stopTicktock = context.WithCancel(context.Background())
+	go p.ticktock(ctx)
+}
+
 func (p *Pool) nowTime() time.Time {
 	return p.now.Load().(time.Time)
 }
@@ -166,15 +198,8 @@ func NewPool(size int, options ...Option) (*Pool, error) {
 
 	p.cond = sync.NewCond(p.lock)
 
-	// Start a goroutine to clean up expired workers periodically.
+	p.startHeartbeat()
-	var ctx context.Context
+	p.startTicktock()
-	ctx, p.stopHeartbeat = context.WithCancel(context.Background())
-	if !p.options.DisablePurge {
-		go p.purgeStaleWorkers(ctx)
-	}
-
-	p.now.Store(time.Now())
-	go p.ticktock()
 
 	return p, nil
 }
@@ -259,17 +284,21 @@ func (p *Pool) Release() {
 
 // ReleaseTimeout is like Release but with a timeout, it waits all workers to exit before timing out.
 func (p *Pool) ReleaseTimeout(timeout time.Duration) error {
-	if p.IsClosed() || p.stopHeartbeat == nil {
+	if p.IsClosed() || p.stopHeartbeat == nil || p.stopTicktock == nil {
 		return ErrPoolClosed
 	}
 
 	p.stopHeartbeat()
 	p.stopHeartbeat = nil
+	p.stopTicktock()
+	p.stopTicktock = nil
 	p.Release()
 
 	endTime := time.Now().Add(timeout)
 	for time.Now().Before(endTime) {
-		if p.Running() == 0 && (p.options.DisablePurge || atomic.LoadInt32(&p.heartbeatDone) == 1) {
+		if p.Running() == 0 &&
+			(p.options.DisablePurge || atomic.LoadInt32(&p.heartbeatDone) == 1) &&
+			atomic.LoadInt32(&p.ticktockDone) == 1 {
 			return nil
 		}
 		time.Sleep(10 * time.Millisecond)
@@ -281,11 +310,9 @@ func (p *Pool) ReleaseTimeout(timeout time.Duration) error {
 func (p *Pool) Reboot() {
 	if atomic.CompareAndSwapInt32(&p.state, CLOSED, OPENED) {
 		atomic.StoreInt32(&p.heartbeatDone, 0)
-		var ctx context.Context
+		p.startHeartbeat()
-		ctx, p.stopHeartbeat = context.WithCancel(context.Background())
+		atomic.StoreInt32(&p.ticktockDone, 0)
-		if !p.options.DisablePurge {
+		p.startTicktock()
-			go p.purgeStaleWorkers(ctx)
-		}
 	}
 }
 

pool_func.go

@@ -64,6 +64,9 @@ type PoolWithFunc struct {
 	heartbeatDone int32
 	stopHeartbeat context.CancelFunc
 
+	ticktockDone int32
+	stopTicktock context.CancelFunc
+
 	now atomic.Value
 
 	options *Options
@@ -134,15 +137,44 @@ func (p *PoolWithFunc) purgeStaleWorkers(ctx context.Context) {
 }
 
 // ticktock is a goroutine that updates the current time in the pool regularly.
-func (p *PoolWithFunc) ticktock() {
+func (p *PoolWithFunc) ticktock(ctx context.Context) {
 	ticker := time.NewTicker(nowTimeUpdateInterval)
-	defer ticker.Stop()
+	defer func() {
+		ticker.Stop()
+		atomic.StoreInt32(&p.ticktockDone, 1)
+	}()
+
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-ticker.C:
+		}
+
+		if p.IsClosed() {
+			break
+		}
 
-	for range ticker.C {
 		p.now.Store(time.Now())
 	}
 }
 
+func (p *PoolWithFunc) startHeartbeat() {
+	// Start a goroutine to clean up expired workers periodically.
+	var ctx context.Context
+	ctx, p.stopHeartbeat = context.WithCancel(context.Background())
+	if !p.options.DisablePurge {
+		go p.purgeStaleWorkers(ctx)
+	}
+}
+
+func (p *PoolWithFunc) startTicktock() {
+	p.now.Store(time.Now())
+	var ctx context.Context
+	ctx, p.stopTicktock = context.WithCancel(context.Background())
+	go p.ticktock(ctx)
+}
+
 func (p *PoolWithFunc) nowTime() time.Time {
 	return p.now.Load().(time.Time)
 }
@@ -191,15 +223,8 @@ func NewPoolWithFunc(size int, pf func(interface{}), options ...Option) (*PoolWi
 	}
 	p.cond = sync.NewCond(p.lock)
 
-	// Start a goroutine to clean up expired workers periodically.
+	p.startHeartbeat()
-	var ctx context.Context
+	p.startTicktock()
-	ctx, p.stopHeartbeat = context.WithCancel(context.Background())
-	if !p.options.DisablePurge {
-		go p.purgeStaleWorkers(ctx)
-	}
-
-	p.now.Store(time.Now())
-	go p.ticktock()
 
 	return p, nil
 }
@@ -288,17 +313,21 @@ func (p *PoolWithFunc) Release() {
 
 // ReleaseTimeout is like Release but with a timeout, it waits all workers to exit before timing out.
 func (p *PoolWithFunc) ReleaseTimeout(timeout time.Duration) error {
-	if p.IsClosed() || p.stopHeartbeat == nil {
+	if p.IsClosed() || p.stopHeartbeat == nil || p.stopTicktock == nil {
 		return ErrPoolClosed
 	}
 
 	p.stopHeartbeat()
 	p.stopHeartbeat = nil
+	p.stopTicktock()
+	p.stopTicktock = nil
 	p.Release()
 
 	endTime := time.Now().Add(timeout)
 	for time.Now().Before(endTime) {
-		if p.Running() == 0 && (p.options.DisablePurge || atomic.LoadInt32(&p.heartbeatDone) == 1) {
+		if p.Running() == 0 &&
+			(p.options.DisablePurge || atomic.LoadInt32(&p.heartbeatDone) == 1) &&
+			atomic.LoadInt32(&p.ticktockDone) == 1 {
 			return nil
 		}
 		time.Sleep(10 * time.Millisecond)
@@ -310,11 +339,9 @@ func (p *PoolWithFunc) ReleaseTimeout(timeout time.Duration) error {
 func (p *PoolWithFunc) Reboot() {
 	if atomic.CompareAndSwapInt32(&p.state, CLOSED, OPENED) {
 		atomic.StoreInt32(&p.heartbeatDone, 0)
-		var ctx context.Context
+		p.startHeartbeat()
-		ctx, p.stopHeartbeat = context.WithCancel(context.Background())
+		atomic.StoreInt32(&p.ticktockDone, 0)
-		if !p.options.DisablePurge {
+		p.startTicktock()
-			go p.purgeStaleWorkers(ctx)
-		}
 	}
 }