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Signed-off-by: Kohei Tokunaga <ktokunaga.mail@gmail.com>
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Locker
=====
locker provides a mechanism for creating finer-grained locking to help
free up more global locks to handle other tasks.
The implementation looks close to a sync.Mutex, however, the user must provide a
reference to use to refer to the underlying lock when locking and unlocking,
and unlock may generate an error.
If a lock with a given name does not exist when `Lock` is called, one is
created.
Lock references are automatically cleaned up on `Unlock` if nothing else is
waiting for the lock.
## Usage
```go
package important
import (
"sync"
"time"
"github.com/moby/locker"
)
type important struct {
locks *locker.Locker
data map[string]interface{}
mu sync.Mutex
}
func (i *important) Get(name string) interface{} {
i.locks.Lock(name)
defer i.locks.Unlock(name)
return i.data[name]
}
func (i *important) Create(name string, data interface{}) {
i.locks.Lock(name)
defer i.locks.Unlock(name)
i.createImportant(data)
i.mu.Lock()
i.data[name] = data
i.mu.Unlock()
}
func (i *important) createImportant(data interface{}) {
time.Sleep(10 * time.Second)
}
```
For functions dealing with a given name, always lock at the beginning of the
function (or before doing anything with the underlying state), this ensures any
other function that is dealing with the same name will block.
When needing to modify the underlying data, use the global lock to ensure nothing
else is modifying it at the same time.
Since name lock is already in place, no reads will occur while the modification
is being performed.

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module github.com/moby/locker
go 1.13

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/*
Package locker provides a mechanism for creating finer-grained locking to help
free up more global locks to handle other tasks.
The implementation looks close to a sync.Mutex, however the user must provide a
reference to use to refer to the underlying lock when locking and unlocking,
and unlock may generate an error.
If a lock with a given name does not exist when `Lock` is called, one is
created.
Lock references are automatically cleaned up on `Unlock` if nothing else is
waiting for the lock.
*/
package locker
import (
"errors"
"sync"
"sync/atomic"
)
// ErrNoSuchLock is returned when the requested lock does not exist
var ErrNoSuchLock = errors.New("no such lock")
// Locker provides a locking mechanism based on the passed in reference name
type Locker struct {
mu sync.Mutex
locks map[string]*lockCtr
}
// lockCtr is used by Locker to represent a lock with a given name.
type lockCtr struct {
mu sync.Mutex
// waiters is the number of waiters waiting to acquire the lock
// this is int32 instead of uint32 so we can add `-1` in `dec()`
waiters int32
}
// inc increments the number of waiters waiting for the lock
func (l *lockCtr) inc() {
atomic.AddInt32(&l.waiters, 1)
}
// dec decrements the number of waiters waiting on the lock
func (l *lockCtr) dec() {
atomic.AddInt32(&l.waiters, -1)
}
// count gets the current number of waiters
func (l *lockCtr) count() int32 {
return atomic.LoadInt32(&l.waiters)
}
// Lock locks the mutex
func (l *lockCtr) Lock() {
l.mu.Lock()
}
// Unlock unlocks the mutex
func (l *lockCtr) Unlock() {
l.mu.Unlock()
}
// New creates a new Locker
func New() *Locker {
return &Locker{
locks: make(map[string]*lockCtr),
}
}
// Lock locks a mutex with the given name. If it doesn't exist, one is created
func (l *Locker) Lock(name string) {
l.mu.Lock()
if l.locks == nil {
l.locks = make(map[string]*lockCtr)
}
nameLock, exists := l.locks[name]
if !exists {
nameLock = &lockCtr{}
l.locks[name] = nameLock
}
// increment the nameLock waiters while inside the main mutex
// this makes sure that the lock isn't deleted if `Lock` and `Unlock` are called concurrently
nameLock.inc()
l.mu.Unlock()
// Lock the nameLock outside the main mutex so we don't block other operations
// once locked then we can decrement the number of waiters for this lock
nameLock.Lock()
nameLock.dec()
}
// Unlock unlocks the mutex with the given name
// If the given lock is not being waited on by any other callers, it is deleted
func (l *Locker) Unlock(name string) error {
l.mu.Lock()
nameLock, exists := l.locks[name]
if !exists {
l.mu.Unlock()
return ErrNoSuchLock
}
if nameLock.count() == 0 {
delete(l.locks, name)
}
nameLock.Unlock()
l.mu.Unlock()
return nil
}