mirror of https://github.com/panjf2000/ants.git
104 lines
3.5 KiB
Go
104 lines
3.5 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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"errors"
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"math"
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"runtime"
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)
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const (
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// DEFAULT_ANTS_POOL_SIZE is the default capacity for a default goroutine pool.
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DEFAULT_ANTS_POOL_SIZE = math.MaxInt32
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// DEFAULT_CLEAN_INTERVAL_TIME is the interval time to clean up goroutines.
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DEFAULT_CLEAN_INTERVAL_TIME = 1
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// CLOSED represents that the pool is closed.
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CLOSED = 1
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)
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var (
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// Error types for the Ants API.
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//---------------------------------------------------------------------------
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// ErrInvalidPoolSize will be returned when setting a negative number as pool capacity.
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ErrInvalidPoolSize = errors.New("invalid size for pool")
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// ErrInvalidPoolExpiry will be returned when setting a negative number as the periodic duration to purge goroutines.
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ErrInvalidPoolExpiry = errors.New("invalid expiry for pool")
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// ErrPoolClosed will be returned when submitting task to a closed pool.
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ErrPoolClosed = errors.New("this pool has been closed")
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// ErrPoolOverload will be returned when the pool is full and no workers available.
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ErrPoolOverload = errors.New("too many goroutines blocked on submit or Nonblocking is set")
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//---------------------------------------------------------------------------
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// workerChanCap determines whether the channel of a worker should be a buffered channel
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// to get the best performance. Inspired by fasthttp at https://github.com/valyala/fasthttp/blob/master/workerpool.go#L139
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workerChanCap = func() int {
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// Use blocking workerChan if GOMAXPROCS=1.
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// This immediately switches Serve to WorkerFunc, which results
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// in higher performance (under go1.5 at least).
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if runtime.GOMAXPROCS(0) == 1 {
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return 0
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}
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// Use non-blocking workerChan if GOMAXPROCS>1,
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// since otherwise the Serve caller (Acceptor) may lag accepting
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// new connections if WorkerFunc is CPU-bound.
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return 1
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}()
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defaultAntsPool, _ = NewPool(DEFAULT_ANTS_POOL_SIZE)
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)
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// Init a instance pool when importing ants.
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// Submit submits a task to pool.
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func Submit(task func()) error {
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return defaultAntsPool.Submit(task)
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}
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// Running returns the number of the currently running goroutines.
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func Running() int {
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return defaultAntsPool.Running()
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}
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// Cap returns the capacity of this default pool.
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func Cap() int {
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return defaultAntsPool.Cap()
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}
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// Free returns the available goroutines to work.
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func Free() int {
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return defaultAntsPool.Free()
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}
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// Release Closes the default pool.
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func Release() {
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defaultAntsPool.Release()
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}
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