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worker.go
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worker.go
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// MIT License
// Copyright (c) 2018 Andy Pan
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package ants
import (
"runtime"
"time"
)
// goWorker is the actual executor who runs the tasks,
// it starts a goroutine that accepts tasks and
// performs function calls.
type goWorker struct {
// pool who owns this worker.
pool *Pool
// task is a job should be done.
task chan func()
// recycleTime will be update when putting a worker back into queue.
recycleTime time.Time
}
// run starts a goroutine to repeat the process
// that performs the function calls.
func (w *goWorker) run() {
w.pool.incRunning()
go func() {
defer func() {
w.pool.decRunning()
w.pool.workerCache.Put(w)
if p := recover(); p != nil {
if ph := w.pool.options.PanicHandler; ph != nil {
ph(p)
} else {
w.pool.options.Logger.Printf("worker exits from a panic: %v\n", p)
var buf [4096]byte
n := runtime.Stack(buf[:], false)
w.pool.options.Logger.Printf("worker exits from panic: %s\n", string(buf[:n]))
}
}
// Call Signal() here in case there are goroutines waiting for available workers.
w.pool.cond.Signal()
}()
for f := range w.task {
if f == nil {
return
}
f()
if ok := w.pool.revertWorker(w); !ok {
return
}
}
}()
}