gitee.com/go-spring2/spring-base@v1.1.3/util/chan.go (about)

     1  /*
     2   * Copyright 2012-2019 the original author or authors.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *      https://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package util
    18  
    19  // SafeCloseChan closes the channel safely.
    20  func SafeCloseChan(ch chan struct{}) {
    21  	select {
    22  	case <-ch:
    23  		// The chan has been closed, there is no need to close it again.
    24  	default:
    25  		close(ch)
    26  	}
    27  }