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// Copyright 2015 The Gogs Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package models
import (
"sync"
)
// workingPool represents a pool of working status which makes sure
// that only one instance of same task is performing at a time.
// However, different type of tasks can performing at the same time.
type workingPool struct {
lock sync.Mutex
pool map[string]*sync.Mutex
count map[string]int
}
// CheckIn checks in a task and waits if others are running.
func (p *workingPool) CheckIn(name string) {
p.lock.Lock()
lock, has := p.pool[name]
if !has {
lock = &sync.Mutex{}
p.pool[name] = lock
}
p.count[name]++
p.lock.Unlock()
lock.Lock()
}
// CheckOut checks out a task to let other tasks run.
func (p *workingPool) CheckOut(name string) {
p.lock.Lock()
defer p.lock.Unlock()
p.pool[name].Unlock()
if p.count[name] == 1 {
delete(p.pool, name)
delete(p.count, name)
} else {
p.count[name]--
}
}
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