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// RUN: %empty-directory(%t)
// RUN: %target-build-swift -Xfrontend -disable-availability-checking %s -o %t/a.out
// RUN: %target-codesign %t/a.out
// RUN: %target-run %t/a.out
// REQUIRES: executable_test
// REQUIRES: concurrency
// REQUIRES: concurrency_runtime
// UNSUPPORTED: back_deployment_runtime
// UNSUPPORTED: back_deploy_concurrency
// UNSUPPORTED: use_os_stdlib
// UNSUPPORTED: freestanding
import StdlibUnittest
@_spi(MainActorUtilities) import _Concurrency
func doStuffAsync() async {
await Task.sleep(500)
}
let tests = TestSuite("StartOnMainActor")
tests.test("startOnMainActor") {
// "global" variables for this test
struct Globals {
@MainActor
static var ran = false
}
@MainActor
func run() async {
Globals.ran = true
await doStuffAsync()
}
// enqueue item on the MainActor
let t1 = Task { @MainActor in
await Task.sleep(1000)
}
expectFalse(Globals.ran)
// Run something with side-effects on the main actor
let t2 = Task.startOnMainActor {
return await run()
}
expectTrue(Globals.ran)
await t1.value
await t2.value
}
tests.test("throwing startOnMainActor") {
// "global" variables for this test
struct Globals {
@MainActor
static var ran = false
}
struct StringError: Error {
let message: String
}
@MainActor
func run() async throws {
Globals.ran = true
await doStuffAsync()
throw StringError(message: "kablamo!")
}
// enqueue item on the MainActor
let t1 = Task { @MainActor in
await Task.sleep(1000)
}
expectFalse(Globals.ran)
// Run something with side-effects on the main actor
let t2 = Task.startOnMainActor {
return try await run()
}
expectTrue(Globals.ran)
await t1.value
expectNil(try? await t2.value)
}
await runAllTestsAsync()
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