Add a feature of rebooting a released pool

ants.go

@@ -35,9 +35,14 @@ const (
 
 	// DefaultCleanIntervalTime is the interval time to clean up goroutines.
 	DefaultCleanIntervalTime = time.Second
+)
+
+const (
+	// OPENED represents that the pool is opened.
+	OPENED = iota
 
 	// CLOSED represents that the pool is closed.
-	CLOSED = 1
+	CLOSED
 )
 
 var (
@@ -171,3 +176,8 @@ func Free() int {
 func Release() {
 	defaultAntsPool.Release()
 }
+
+// Reboot reboots the default pool.
+func Reboot() {
+	defaultAntsPool.Reboot()
+}

ants_test.go

@@ -475,6 +475,60 @@ func TestMaxBlockingSubmitWithFunc(t *testing.T) {
 	default:
 	}
 }
+
+func TestRebootDefaultPool(t *testing.T) {
+	defer Release()
+	Reboot()
+	var wg sync.WaitGroup
+	wg.Add(1)
+	_ = Submit(func() {
+		demoFunc()
+		wg.Done()
+	})
+	wg.Wait()
+	Release()
+	assert.EqualError(t, Submit(nil), ErrPoolClosed.Error(), "pool should be closed")
+	Reboot()
+	wg.Add(1)
+	assert.NoError(t, Submit(func() { wg.Done() }), "pool should be rebooted")
+	wg.Wait()
+}
+
+func TestRebootNewPool(t *testing.T) {
+	var wg sync.WaitGroup
+	p, err := NewPool(10)
+	assert.NoErrorf(t, err, "create Pool failed: %v", err)
+	defer p.Release()
+	wg.Add(1)
+	_ = p.Submit(func() {
+		demoFunc()
+		wg.Done()
+	})
+	wg.Wait()
+	p.Release()
+	assert.EqualError(t, p.Submit(nil), ErrPoolClosed.Error(), "pool should be closed")
+	p.Reboot()
+	wg.Add(1)
+	assert.NoError(t, p.Submit(func() { wg.Done() }), "pool should be rebooted")
+	wg.Wait()
+
+	p1, err := NewPoolWithFunc(10, func(i interface{}) {
+		demoPoolFunc(i)
+		wg.Done()
+	})
+	assert.NoErrorf(t, err, "create TimingPoolWithFunc failed: %v", err)
+	defer p1.Release()
+	wg.Add(1)
+	_ = p1.Invoke(1)
+	wg.Wait()
+	p1.Release()
+	assert.EqualError(t, p1.Invoke(nil), ErrPoolClosed.Error(), "pool should be closed")
+	p1.Reboot()
+	wg.Add(1)
+	assert.NoError(t, p1.Invoke(1), "pool should be rebooted")
+	wg.Wait()
+}
+
 func TestRestCodeCoverage(t *testing.T) {
 	_, err := NewPool(-1, WithExpiryDuration(-1))
 	t.Log(err)

pool.go

@@ -41,8 +41,8 @@ type Pool struct {
 	// workers is a slice that store the available workers.
 	workers workerArray
 
-	// release is used to notice the pool to closed itself.
+	// state is used to notice the pool to closed itself.
-	release int32
+	state int32
 
 	// lock for synchronous operation.
 	lock sync.Locker
@@ -50,9 +50,6 @@ type Pool struct {
 	// cond for waiting to get a idle worker.
 	cond *sync.Cond
 
-	// once makes sure releasing this pool will just be done for one time.
-	once sync.Once
-
 	// workerCache speeds up the obtainment of the an usable worker in function:retrieveWorker.
 	workerCache sync.Pool
 
@@ -62,13 +59,13 @@ type Pool struct {
 	options *Options
 }
 
-// Clear expired workers periodically.
+// periodicallyPurge clears expired workers periodically.
 func (p *Pool) periodicallyPurge() {
 	heartbeat := time.NewTicker(p.options.ExpiryDuration)
 	defer heartbeat.Stop()
 
 	for range heartbeat.C {
-		if atomic.LoadInt32(&p.release) == CLOSED {
+		if atomic.LoadInt32(&p.state) == CLOSED {
 			break
 		}
 
@@ -139,7 +136,7 @@ func NewPool(size int, options ...Option) (*Pool, error) {
 
 // Submit submits a task to this pool.
 func (p *Pool) Submit(task func()) error {
-	if atomic.LoadInt32(&p.release) == CLOSED {
+	if atomic.LoadInt32(&p.state) == CLOSED {
 		return ErrPoolClosed
 	}
 	var w *goWorker
@@ -175,12 +172,17 @@ func (p *Pool) Tune(size int) {
 
 // Release Closes this pool.
 func (p *Pool) Release() {
-	p.once.Do(func() {
+	atomic.StoreInt32(&p.state, CLOSED)
-		atomic.StoreInt32(&p.release, 1)
 	p.lock.Lock()
 	p.workers.reset()
 	p.lock.Unlock()
-	})
+}
+
+// Reboot reboots a released pool.
+func (p *Pool) Reboot() {
+	if atomic.CompareAndSwapInt32(&p.state, CLOSED, OPENED) {
+		go p.periodicallyPurge()
+	}
 }
 
 // ---------------------------------------------------------------------------
@@ -242,7 +244,7 @@ func (p *Pool) retrieveWorker() *goWorker {
 
 // revertWorker puts a worker back into free pool, recycling the goroutines.
 func (p *Pool) revertWorker(worker *goWorker) bool {
-	if atomic.LoadInt32(&p.release) == CLOSED || p.Running() > p.Cap() {
+	if atomic.LoadInt32(&p.state) == CLOSED || p.Running() > p.Cap() {
 		return false
 	}
 	worker.recycleTime = time.Now()

pool_func.go

@@ -41,8 +41,8 @@ type PoolWithFunc struct {
 	// workers is a slice that store the available workers.
 	workers []*goWorkerWithFunc
 
-	// release is used to notice the pool to closed itself.
+	// state is used to notice the pool to closed itself.
-	release int32
+	state int32
 
 	// lock for synchronous operation.
 	lock sync.Locker
@@ -53,9 +53,6 @@ type PoolWithFunc struct {
 	// poolFunc is the function for processing tasks.
 	poolFunc func(interface{})
 
-	// once makes sure releasing this pool will just be done for one time.
-	once sync.Once
-
 	// workerCache speeds up the obtainment of the an usable worker in function:retrieveWorker.
 	workerCache sync.Pool
 
@@ -65,14 +62,14 @@ type PoolWithFunc struct {
 	options *Options
 }
 
-// Clear expired workers periodically.
+// periodicallyPurge clears expired workers periodically.
 func (p *PoolWithFunc) periodicallyPurge() {
 	heartbeat := time.NewTicker(p.options.ExpiryDuration)
 	defer heartbeat.Stop()
 
 	var expiredWorkers []*goWorkerWithFunc
 	for range heartbeat.C {
-		if atomic.LoadInt32(&p.release) == CLOSED {
+		if atomic.LoadInt32(&p.state) == CLOSED {
 			break
 		}
 		currentTime := time.Now()
@@ -158,7 +155,7 @@ func NewPoolWithFunc(size int, pf func(interface{}), options ...Option) (*PoolWi
 
 // Invoke submits a task to pool.
 func (p *PoolWithFunc) Invoke(args interface{}) error {
-	if atomic.LoadInt32(&p.release) == CLOSED {
+	if atomic.LoadInt32(&p.state) == CLOSED {
 		return ErrPoolClosed
 	}
 	var w *goWorkerWithFunc
@@ -194,8 +191,7 @@ func (p *PoolWithFunc) Tune(size int) {
 
 // Release Closes this pool.
 func (p *PoolWithFunc) Release() {
-	p.once.Do(func() {
+	atomic.StoreInt32(&p.state, CLOSED)
-		atomic.StoreInt32(&p.release, 1)
 	p.lock.Lock()
 	idleWorkers := p.workers
 	for _, w := range idleWorkers {
@@ -203,7 +199,13 @@ func (p *PoolWithFunc) Release() {
 	}
 	p.workers = nil
 	p.lock.Unlock()
-	})
+}
+
+// Reboot reboots a released pool.
+func (p *PoolWithFunc) Reboot() {
+	if atomic.CompareAndSwapInt32(&p.state, CLOSED, OPENED) {
+		go p.periodicallyPurge()
+	}
 }
 
 //---------------------------------------------------------------------------
@@ -269,7 +271,7 @@ func (p *PoolWithFunc) retrieveWorker() *goWorkerWithFunc {
 
 // revertWorker puts a worker back into free pool, recycling the goroutines.
 func (p *PoolWithFunc) revertWorker(worker *goWorkerWithFunc) bool {
-	if atomic.LoadInt32(&p.release) == CLOSED || p.Running() > p.Cap() {
+	if atomic.LoadInt32(&p.state) == CLOSED || p.Running() > p.Cap() {
 		return false
 	}
 	worker.recycleTime = time.Now()