Mutex using channels and goroutines

mutex.go

import (
	"fmt"
	"sync"
)

type Mutex struct {
    lockCh chan struct {}
    unlockCh chan struct {}
    doneCh chan struct {}
}

func createMutex() Mutex {
    lockCh := make(chan struct {})
    unlockCh := make(chan struct {})
    doneCh := make(chan struct {})
    // Spawn a goroutine which manages the lock
    go func() {
        for {
            select {
            case doneCh <- struct{} {}:
                return
            // only one can lock at a time
            case <-lockCh: // permit lock
                <-unlockCh // ensure exclusion until it is unlocked,
            }
        }
    }()
    return (Mutex {
        lockCh,
        unlockCh,
        doneCh,
    })
}

func (mutex Mutex) lock() {
    mutex.lockCh<- struct {} {}
}

func (mutex Mutex) unlock() {
    mutex.unlockCh<- struct {} {}
}

func (mutex Mutex) done() {
    <-mutex.doneCh
}