Unknwon
8 years ago
parent
15845cb287
commit
660e7a178a
@ -1,47 +0,0 @@
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// Copyright 2015 The Gogs Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package models
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import (
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"sync"
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)
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// workingPool represents a pool of working status which makes sure
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// that only one instance of same task is performing at a time.
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// However, different type of tasks can performing at the same time.
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type workingPool struct {
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lock sync.Mutex
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pool map[string]*sync.Mutex
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count map[string]int
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}
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// CheckIn checks in a task and waits if others are running.
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func (p *workingPool) CheckIn(name string) {
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p.lock.Lock()
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lock, has := p.pool[name]
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if !has {
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lock = &sync.Mutex{}
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p.pool[name] = lock
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}
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p.count[name]++
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p.lock.Unlock()
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lock.Lock()
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}
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// CheckOut checks out a task to let other tasks run.
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func (p *workingPool) CheckOut(name string) {
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p.lock.Lock()
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defer p.lock.Unlock()
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p.pool[name].Unlock()
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if p.count[name] == 1 {
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delete(p.pool, name)
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delete(p.count, name)
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} else {
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p.count[name]--
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}
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}
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@ -0,0 +1,67 @@
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// Copyright 2016 The Gogs Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package sync
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import (
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"sync"
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)
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// SingleInstancePool is a pool of non-identical instances
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// that only one instance with same identity is in the pool at a time.
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// In other words, only instances with different identities can exist
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// at the same time.
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//
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// This pool is particularly useful for performing tasks on same resource
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// on the file system in different goroutines.
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type SingleInstancePool struct {
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lock sync.Mutex
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// pool maintains locks for each instance in the pool.
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pool map[string]*sync.Mutex
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// count maintains the number of times an instance with same identity checks in
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// to the pool, and should be reduced to 0 (removed from map) by checking out
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// with same number of times.
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count map[string]int
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}
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// NewSingleInstancePool initializes and returns a new SingleInstancePool object.
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func NewSingleInstancePool() *SingleInstancePool {
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return &SingleInstancePool{
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pool: make(map[string]*sync.Mutex),
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count: make(map[string]int),
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}
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}
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// CheckIn checks in an instance to the pool and hangs while instance
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// with same indentity is using the lock.
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func (p *SingleInstancePool) CheckIn(identity string) {
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p.lock.Lock()
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lock, has := p.pool[identity]
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if !has {
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lock = &sync.Mutex{}
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p.pool[identity] = lock
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}
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p.count[identity]++
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p.lock.Unlock()
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lock.Lock()
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}
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// CheckOut checks out an instance from the pool and releases the lock
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// to let other instances with same identity to grab the lock.
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func (p *SingleInstancePool) CheckOut(identity string) {
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p.lock.Lock()
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defer p.lock.Unlock()
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p.pool[identity].Unlock()
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if p.count[identity] == 1 {
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delete(p.pool, identity)
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delete(p.count, identity)
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} else {
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p.count[identity]--
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}
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}
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@ -0,0 +1,49 @@
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// Copyright 2016 The Gogs Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package sync
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import (
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"sync"
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)
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// StatusTable is a table maintains true/false values.
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//
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// This table is particularly useful for un/marking and checking values
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// in different goroutines.
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type StatusTable struct {
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lock sync.RWMutex
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pool map[string]bool
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}
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// NewStatusTable initializes and returns a new StatusTable object.
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func NewStatusTable() *StatusTable {
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return &StatusTable{
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pool: make(map[string]bool),
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}
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}
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// Start sets value of given name to true in the pool.
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func (p *StatusTable) Start(name string) {
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p.lock.Lock()
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defer p.lock.Unlock()
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p.pool[name] = true
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}
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// Stop sets value of given name to false in the pool.
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func (p *StatusTable) Stop(name string) {
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p.lock.Lock()
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defer p.lock.Unlock()
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p.pool[name] = false
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}
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// IsRunning checks if value of given name is set to true in the pool.
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func (p *StatusTable) IsRunning(name string) bool {
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p.lock.RLock()
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defer p.lock.RUnlock()
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return p.pool[name]
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}
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