// Copyright 2021 The mqtt-go authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package mqtt

import (
	"sync"
)

type firstError struct {
	mu  sync.RWMutex
	err error
}

func (e *firstError) Store(err error) {
	e.mu.Lock()
	if e.err == nil {
		e.err = err
	}
	e.mu.Unlock()
}

func (e *firstError) Load() error {
	e.mu.RLock()
	defer e.mu.RUnlock()
	return e.err
}