/
LimitedParallelismConcurrentTest.kt
59 lines (52 loc) · 1.59 KB
/
LimitedParallelismConcurrentTest.kt
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
/*
* Copyright 2016-2022 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
import kotlinx.atomicfu.*
import kotlinx.coroutines.*
import kotlinx.coroutines.exceptions.*
import kotlin.test.*
class LimitedParallelismConcurrentTest : TestBase() {
private val targetParallelism = 4
private val iterations = 100_000
private val parallelism = atomic(0)
private fun checkParallelism() {
val value = parallelism.incrementAndGet()
randomWait()
assertTrue { value <= targetParallelism }
parallelism.decrementAndGet()
}
@Test
fun testLimitedExecutor() = runMtTest {
val executor = newFixedThreadPoolContext(targetParallelism, "test")
val view = executor.limitedParallelism(targetParallelism)
doStress {
repeat(iterations) {
launch(view) {
checkParallelism()
}
}
}
executor.close()
}
private suspend inline fun doStress(crossinline block: suspend CoroutineScope.() -> Unit) {
repeat(stressTestMultiplier) {
coroutineScope {
block()
}
}
}
@Test
fun testTaskFairness() = runMtTest {
val executor = newSingleThreadContext("test")
val view = executor.limitedParallelism(1)
val view2 = executor.limitedParallelism(1)
val j1 = launch(view) {
while (true) {
yield()
}
}
val j2 = launch(view2) { j1.cancel() }
joinAll(j1, j2)
executor.close()
}
}