// ------------------------------------------------------------------------
//   Project atila
//   Active Thing (activething.com) git.activething.com/go
//
//   File name  rkey.go
//   Created by DEV
//   Modified   05/02/2024
//
//   Copyright 2024 activething.com
// ------------------------------------------------------------------------
// 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 ctxs

import "sync/atomic"

type (


	Cancel struct {
		active uint32
		doneCh chan struct{}
	}
)


func NewCancel() *Cancel {
	return &Cancel{
		active: 1,
		doneCh: make(chan struct{}),
	}
}


func (c *Cancel) Cancel() {
	if atomic.CompareAndSwapUint32(&c.active,1,0) {
		close(c.doneCh)
	}
}


func (c *Cancel) Done() <-chan struct{} {
	return c.doneCh }


func (c *Cancel) IsDone() bool {
	return atomic.LoadUint32(&c.active) == 1  }


func (c *Cancel) Wait() {
	<-c.doneCh }

/*
   ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

   I HAVE NO DESIRE TO WALK ON WATER," SAID SIDDHARTA.
   "LET THE OLD SHRAMANAS SATISFY THEMSELVES WITH SUCH SKILLS.

   SIDDHARTA
   - HERMANN HESSE -

   :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

*/