KTOR-6243 Fix darwin task leak (#3791)

219dd0b2 · Leonid Stashevsky · GitHub · def98a30 · 219dd0b2 · 219dd0b2
--- a/.gitignore
+++ b/.gitignore
@@ -39,3 +39,4 @@ hs_err_pid*.log

 gradle-user-home

+.fleet
--- a/ktor-client/ktor-client-darwin/darwin/src/io/ktor/client/engine/darwin/internal/DarwinSession.kt
+++ b/ktor-client/ktor-client-darwin/darwin/src/io/ktor/client/engine/darwin/internal/DarwinSession.kt
@@ -6,6 +6,7 @@ import io.ktor.utils.io.*
 import io.ktor.utils.io.core.*
 import kotlinx.atomicfu.*
 import kotlinx.cinterop.*
+import kotlinx.coroutines.*
 import platform.Foundation.*
 import kotlin.coroutines.*

@@ -34,6 +35,12 @@ internal class DarwinSession(
            task to response
        }

+        callContext.job.invokeOnCompletion { cause ->
+            if (cause != null) {
+                task.cancel()
+            }
+        }
+
        task.resume()

        try {