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

var mu = trylock.New()

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

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