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/*
* Copyright 2016-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
@file:Suppress("unused")
package kotlinx.coroutines.lincheck
import kotlinx.coroutines.*
import kotlinx.coroutines.channels.*
import kotlinx.coroutines.channels.Channel.Factory.CONFLATED
import kotlinx.coroutines.channels.Channel.Factory.RENDEZVOUS
import kotlinx.coroutines.channels.Channel.Factory.UNLIMITED
import kotlinx.coroutines.selects.*
import org.jetbrains.kotlinx.lincheck.*
import org.jetbrains.kotlinx.lincheck.annotations.*
import org.jetbrains.kotlinx.lincheck.annotations.Operation
import org.jetbrains.kotlinx.lincheck.paramgen.*
import org.jetbrains.kotlinx.lincheck.verifier.*
class RendezvousChannelLincheckTest : ChannelLincheckTestBase(
c = Channel(RENDEZVOUS),
sequentialSpecification = SequentialRendezvousChannel::class.java
)
class SequentialRendezvousChannel : SequentialIntChannelBase(RENDEZVOUS)
class Array1ChannelLincheckTest : ChannelLincheckTestBase(
c = Channel(1),
sequentialSpecification = SequentialArray1RendezvousChannel::class.java
)
class SequentialArray1RendezvousChannel : SequentialIntChannelBase(1)
class Array2ChannelLincheckTest : ChannelLincheckTestBase(
c = Channel(2),
sequentialSpecification = SequentialArray2RendezvousChannel::class.java
)
class SequentialArray2RendezvousChannel : SequentialIntChannelBase(2)
class UnlimitedChannelLincheckTest : ChannelLincheckTestBase(
c = Channel(UNLIMITED),
sequentialSpecification = SequentialUnlimitedChannel::class.java
)
class SequentialUnlimitedChannel : SequentialIntChannelBase(UNLIMITED)
class ConflatedChannelLincheckTest : ChannelLincheckTestBase(
c = Channel(CONFLATED),
sequentialSpecification = SequentialConflatedChannel::class.java
)
class SequentialConflatedChannel : SequentialIntChannelBase(CONFLATED)
@Param.Params(
Param(name = "value", gen = IntGen::class, conf = "1:5"),
Param(name = "closeToken", gen = IntGen::class, conf = "1:3")
)
abstract class ChannelLincheckTestBase(
private val c: Channel<Int>,
private val sequentialSpecification: Class<*>
) : AbstractLincheckTest() {
@Operation(promptCancellation = true)
suspend fun send(@Param(name = "value") value: Int): Any = try {
c.send(value)
} catch (e: NumberedCancellationException) {
e.testResult
}
@Operation
fun trySend(@Param(name = "value") value: Int): Any = c.trySend(value)
.onSuccess { return true }
.onFailure {
return if (it is NumberedCancellationException) it.testResult
else false
}
// TODO: this operation should be (and can be!) linearizable, but is not
// @Operation
suspend fun sendViaSelect(@Param(name = "value") value: Int): Any = try {
select<Unit> { c.onSend(value) {} }
} catch (e: NumberedCancellationException) {
e.testResult
}
@Operation(promptCancellation = true)
suspend fun receive(): Any = try {
c.receive()
} catch (e: NumberedCancellationException) {
e.testResult
}
@Operation
fun tryReceive(): Any? =
c.tryReceive()
.onSuccess { return it }
.onFailure { return if (it is NumberedCancellationException) it.testResult else null }
// TODO: this operation should be (and can be!) linearizable, but is not
// @Operation
suspend fun receiveViaSelect(): Any = try {
select<Int> { c.onReceive { it } }
} catch (e: NumberedCancellationException) {
e.testResult
}
@Operation(causesBlocking = true)
fun close(@Param(name = "closeToken") token: Int): Boolean = c.close(NumberedCancellationException(token))
// TODO: this operation should be (and can be!) linearizable, but is not
// @Operation
fun cancel(@Param(name = "closeToken") token: Int) = c.cancel(NumberedCancellationException(token))
// @Operation
fun isClosedForReceive() = c.isClosedForReceive
// @Operation
fun isClosedForSend() = c.isClosedForSend
// TODO: this operation should be (and can be!) linearizable, but is not
// @Operation
fun isEmpty() = c.isEmpty
override fun <O : Options<O, *>> O.customize(isStressTest: Boolean): O =
actorsBefore(0).sequentialSpecification(sequentialSpecification)
}
private class NumberedCancellationException(number: Int) : CancellationException() {
val testResult = "Closed($number)"
}
abstract class SequentialIntChannelBase(private val capacity: Int) : VerifierState() {
private val senders = ArrayList<Pair<CancellableContinuation<Any>, Int>>()
private val receivers = ArrayList<CancellableContinuation<Any>>()
private val buffer = ArrayList<Int>()
private var closedMessage: String? = null
suspend fun send(x: Int): Any = when (val offerRes = trySend(x)) {
true -> Unit
false -> suspendCancellableCoroutine { cont ->
senders.add(cont to x)
}
else -> offerRes
}
fun trySend(element: Int): Any {
if (closedMessage !== null) return closedMessage!!
if (capacity == CONFLATED) {
if (resumeFirstReceiver(element)) return true
buffer.clear()
buffer.add(element)
return true
}
if (resumeFirstReceiver(element)) return true
if (buffer.size < capacity) {
buffer.add(element)
return true
}
return false
}
private fun resumeFirstReceiver(element: Int): Boolean {
while (receivers.isNotEmpty()) {
val r = receivers.removeAt(0)
if (r.resume(element)) return true
}
return false
}
suspend fun receive(): Any = tryReceive() ?: suspendCancellableCoroutine { cont ->
receivers.add(cont)
}
fun tryReceive(): Any? {
if (buffer.isNotEmpty()) {
val el = buffer.removeAt(0)
resumeFirstSender().also {
if (it !== null) buffer.add(it)
}
return el
}
resumeFirstSender()?.also { return it }
if (closedMessage !== null) return closedMessage
return null
}
private fun resumeFirstSender(): Int? {
while (senders.isNotEmpty()) {
val (s, el) = senders.removeAt(0)
if (s.resume(Unit)) return el
}
return null
}
suspend fun sendViaSelect(element: Int) = send(element)
suspend fun receiveViaSelect() = receive()
fun close(token: Int): Boolean {
if (closedMessage !== null) return false
closedMessage = "Closed($token)"
for (r in receivers) r.resume(closedMessage!!)
receivers.clear()
return true
}
fun cancel(token: Int) {
if (!close(token)) return
for ((s, _) in senders) s.resume(closedMessage!!)
senders.clear()
buffer.clear()
}
fun isClosedForSend(): Boolean = closedMessage !== null
fun isClosedForReceive(): Boolean = isClosedForSend() && buffer.isEmpty() && senders.isEmpty()
fun isEmpty(): Boolean {
if (closedMessage !== null) return false
return buffer.isEmpty() && senders.isEmpty()
}
override fun extractState() = buffer to closedMessage
}
private fun <T> CancellableContinuation<T>.resume(res: T): Boolean {
val token = tryResume(res) ?: return false
completeResume(token)
return true
}
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