mirror of https://github.com/panjf2000/ants.git
185 lines
4.4 KiB
Go
185 lines
4.4 KiB
Go
// MIT License
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// Copyright (c) 2018 Andy Pan
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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package ants
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import (
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"math"
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"sync"
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"sync/atomic"
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)
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type pf func(interface{}) error
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// PoolWithFunc accept the tasks from client,it limits the total
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// of goroutines to a given number by recycling goroutines.
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type PoolWithFunc struct {
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// capacity of the pool.
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capacity int32
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// running is the number of the currently running goroutines.
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running int32
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// freeSignal is used to notice pool there are available
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// workers which can be sent to work.
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freeSignal chan sig
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// workers is a slice that store the available workers.
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workers []*WorkerWithFunc
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// release is used to notice the pool to closed itself.
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release chan sig
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// lock for synchronous operation
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lock sync.Mutex
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// pf is the function for processing tasks
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poolFunc pf
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once sync.Once
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}
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// NewPoolWithFunc generates a instance of ants pool with a specific function.
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func NewPoolWithFunc(size int, f pf) (*PoolWithFunc, error) {
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if size <= 0 {
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return nil, ErrPoolSizeInvalid
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}
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p := &PoolWithFunc{
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capacity: int32(size),
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freeSignal: make(chan sig, math.MaxInt32),
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release: make(chan sig, 1),
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poolFunc: f,
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}
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return p, nil
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}
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//-------------------------------------------------------------------------
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// Serve submit a task to pool
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func (p *PoolWithFunc) Serve(args interface{}) error {
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//if atomic.LoadInt32(&p.closed) == 1 {
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// return ErrPoolClosed
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//}
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if len(p.release) > 0 {
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return ErrPoolClosed
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}
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w := p.getWorker()
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w.sendTask(args)
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return nil
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}
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// Running returns the number of the currently running goroutines
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func (p *PoolWithFunc) Running() int {
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return int(atomic.LoadInt32(&p.running))
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}
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// Free returns the available goroutines to work
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func (p *PoolWithFunc) Free() int {
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return int(atomic.LoadInt32(&p.capacity) - atomic.LoadInt32(&p.running))
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}
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// Cap returns the capacity of this pool
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func (p *PoolWithFunc) Cap() int {
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return int(atomic.LoadInt32(&p.capacity))
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}
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// Release Closed this pool
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func (p *PoolWithFunc) Release() error {
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p.once.Do(func() {
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p.release <- sig{}
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running := p.Running()
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for i := 0; i < running; i++ {
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p.getWorker().stop()
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}
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})
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return nil
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}
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// ReSize change the capacity of this pool
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func (p *PoolWithFunc) ReSize(size int) {
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if size < p.Cap() {
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diff := p.Cap() - size
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for i := 0; i < diff; i++ {
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p.getWorker().stop()
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}
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}
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atomic.StoreInt32(&p.capacity, int32(size))
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}
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//-------------------------------------------------------------------------
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// getWorker returns a available worker to run the tasks.
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func (p *PoolWithFunc) getWorker() *WorkerWithFunc {
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var w *WorkerWithFunc
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waiting := false
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p.lock.Lock()
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workers := p.workers
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n := len(workers) - 1
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if n < 0 {
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if p.running >= p.capacity {
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waiting = true
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} else {
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p.running++
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}
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} else {
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w = workers[n]
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workers[n] = nil
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p.workers = workers[:n]
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}
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p.lock.Unlock()
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if waiting {
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<-p.freeSignal
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for {
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p.lock.Lock()
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workers = p.workers
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l := len(workers) - 1
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if l < 0 {
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p.lock.Unlock()
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continue
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}
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w = workers[l]
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workers[l] = nil
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p.workers = workers[:l]
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p.lock.Unlock()
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break
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}
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} else if w == nil {
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w = &WorkerWithFunc{
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pool: p,
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args: make(chan interface{}),
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}
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w.run()
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}
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return w
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}
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// putWorker puts a worker back into free pool, recycling the goroutines.
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func (p *PoolWithFunc) putWorker(worker *WorkerWithFunc) {
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p.lock.Lock()
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p.workers = append(p.workers, worker)
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p.lock.Unlock()
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p.freeSignal <- sig{}
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}
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