import (
    "context"
    "time"
    "errors"
    "github.com/subchen/go-trylock/v2"
)

var mu = trylock.New()

func goroutineWrite() error {
    if ok := mu.TryLock(context.Background()); !ok {
    	return errors.New("timeout, cannot TryLock !!!")
    }
    defer mu.Unlock()
    
    // write something
}

func goroutineWriteTimeout() error {
    if ok := mu.TryLockTimeout(1 * time.Second); !ok {
    	return errors.New("timeout, cannot TryLock !!!")
    }
    defer mu.Unlock()
    
    // write something
}

func goroutineRead() {
    if ok := mu.RTryLock(context.Background()); !ok {
    	return errors.New("timeout, cannot RTryLock !!!")
    }
    defer mu.RUnlock()
    
    // read something
}

func goroutineReadTimeout() {
    if ok := mu.RTryLockTimeout(1 * time.Second); !ok {
    	return errors.New("timeout, cannot RTryLock !!!")
    }
    defer mu.RUnlock()
    
    // read something
}