35 lines
1.4 KiB
Kotlin
35 lines
1.4 KiB
Kotlin
/*
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* Copyright 2020 dorkbox, llc
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dorkbox.executor
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import kotlinx.coroutines.channels.Channel
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// this is waiting, where the notifier DOES NOT BLOCK. The receiver will always block.
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//
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// This IS NOT bi-directional waiting. The method names to not reflect this, however there is no possibility of race conditions w.r.t. waiting
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// https://stackoverflow.com/questions/55421710/how-to-suspend-kotlin-coroutine-until-notified
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// https://kotlinlang.org/docs/reference/coroutines/channels.html
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@JvmInline
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value class SuspendNotifier(private val channel: Channel<Unit> = Channel(2)) {
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// "receive' suspends until another coroutine invokes "send"
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// and
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// "send" WILL NOT suspend. If there nothing waiting, then nothing happens
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suspend fun doWait() { channel.receive() }
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suspend fun doNotify() { channel.send(Unit) }
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fun cancel() { channel.cancel() }
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}
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