github.com/matrixorigin/matrixone@v0.7.0/pkg/vm/engine/tae/common/close.go (about)

     1  // Copyright 2021 Matrix Origin
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package common
    16  
    17  import (
    18  	"sync/atomic"
    19  
    20  	"github.com/matrixorigin/matrixone/pkg/common/moerr"
    21  )
    22  
    23  var (
    24  	ErrClose = moerr.NewInternalErrorNoCtx("closed")
    25  )
    26  
    27  type Closable interface {
    28  	IsClosed() bool
    29  	TryClose() bool
    30  }
    31  
    32  type ClosedState struct {
    33  	closed atomic.Int32
    34  }
    35  
    36  func (c *ClosedState) IsClosed() bool {
    37  	return c.closed.Load() == int32(1)
    38  }
    39  
    40  func (c *ClosedState) TryClose() bool {
    41  	return c.closed.CompareAndSwap(0, 1)
    42  }