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// RUN: %target-run-simple-swift( -Xfrontend -disable-availability-checking %import-libdispatch -parse-as-library )
// REQUIRES: executable_test
// REQUIRES: concurrency
// REQUIRES: libdispatch
// REQUIRES: concurrency_runtime
// UNSUPPORTED: back_deployment_runtime
import Dispatch
@_spi(ConcurrencyExecutors) import _Concurrency
final class MyTaskExecutor: TaskExecutor, @unchecked Sendable, CustomStringConvertible {
let queue: DispatchQueue
init(queue: DispatchQueue) {
self.queue = queue
}
func enqueue(_ job: consuming ExecutorJob) {
let job = UnownedJob(job)
queue.async {
job.runSynchronously(on: self.asUnownedTaskExecutor())
}
}
var description: String {
"\(Self.self)(\(ObjectIdentifier(self))"
}
}
nonisolated func nonisolatedAsyncMethod(expectedOn executor: MyTaskExecutor) async {
dispatchPrecondition(condition: .onQueue(executor.queue))
}
func testNestingWithExecutorMainActor(_ firstExecutor: MyTaskExecutor,
_ secondExecutor: MyTaskExecutor) async {
dispatchPrecondition(condition: .notOnQueue(firstExecutor.queue))
dispatchPrecondition(condition: .notOnQueue(secondExecutor.queue))
await withTaskExecutorPreference(firstExecutor) {
// the block immediately hops to the expected executor
dispatchPrecondition(condition: .onQueue(firstExecutor.queue))
print("OK: withTaskExecutor body")
await nonisolatedAsyncMethod(expectedOn: firstExecutor)
}
await withTaskExecutorPreference(firstExecutor) {
await withTaskExecutorPreference(secondExecutor) {
// the block immediately hops to the expected executor
dispatchPrecondition(condition: .notOnQueue(firstExecutor.queue))
dispatchPrecondition(condition: .onQueue(secondExecutor.queue))
print("OK: withTaskExecutor { withTaskExecutor { ... } }")
await nonisolatedAsyncMethod(expectedOn: secondExecutor)
}
}
await withTaskExecutorPreference(firstExecutor) {
dispatchPrecondition(condition: .onQueue(firstExecutor.queue))
dispatchPrecondition(condition: .notOnQueue(secondExecutor.queue))
await withTaskExecutorPreference(secondExecutor) {
dispatchPrecondition(condition: .notOnQueue(firstExecutor.queue))
dispatchPrecondition(condition: .onQueue(secondExecutor.queue))
await withTaskExecutorPreference(firstExecutor) {
// the block immediately hops to the expected executor
dispatchPrecondition(condition: .onQueue(firstExecutor.queue))
dispatchPrecondition(condition: .notOnQueue(secondExecutor.queue))
print("OK: withTaskExecutor { withTaskExecutor withTaskExecutor { { ... } } }")
await nonisolatedAsyncMethod(expectedOn: firstExecutor)
}
dispatchPrecondition(condition: .notOnQueue(firstExecutor.queue))
dispatchPrecondition(condition: .onQueue(secondExecutor.queue))
}
dispatchPrecondition(condition: .onQueue(firstExecutor.queue))
dispatchPrecondition(condition: .notOnQueue(secondExecutor.queue))
}
dispatchPrecondition(condition: .notOnQueue(firstExecutor.queue))
dispatchPrecondition(condition: .notOnQueue(secondExecutor.queue))
}
func testNestingWithExecutorNonisolated(_ firstExecutor: MyTaskExecutor,
_ secondExecutor: MyTaskExecutor) async {
await withTaskExecutorPreference(firstExecutor) {
// the block immediately hops to the expected executor
dispatchPrecondition(condition: .onQueue(firstExecutor.queue))
print("OK: withTaskExecutor body")
await nonisolatedAsyncMethod(expectedOn: firstExecutor)
}
await withTaskExecutorPreference(firstExecutor) {
await withTaskExecutorPreference(secondExecutor) {
// the block immediately hops to the expected executor
dispatchPrecondition(condition: .notOnQueue(firstExecutor.queue))
dispatchPrecondition(condition: .onQueue(secondExecutor.queue))
print("OK: withTaskExecutor { withTaskExecutor { ... } }")
await nonisolatedAsyncMethod(expectedOn: secondExecutor)
}
}
await withTaskExecutorPreference(firstExecutor) {
dispatchPrecondition(condition: .onQueue(firstExecutor.queue))
dispatchPrecondition(condition: .notOnQueue(secondExecutor.queue))
await withTaskExecutorPreference(secondExecutor) {
dispatchPrecondition(condition: .notOnQueue(firstExecutor.queue))
dispatchPrecondition(condition: .onQueue(secondExecutor.queue))
await withTaskExecutorPreference(firstExecutor) {
// the block immediately hops to the expected executor
dispatchPrecondition(condition: .onQueue(firstExecutor.queue))
dispatchPrecondition(condition: .notOnQueue(secondExecutor.queue))
print("OK: withTaskExecutor { withTaskExecutor withTaskExecutor { { ... } } }")
await nonisolatedAsyncMethod(expectedOn: firstExecutor)
} // on first
dispatchPrecondition(condition: .notOnQueue(firstExecutor.queue))
dispatchPrecondition(condition: .onQueue(secondExecutor.queue))
} // on second
dispatchPrecondition(condition: .onQueue(firstExecutor.queue))
dispatchPrecondition(condition: .notOnQueue(secondExecutor.queue))
} // on first
dispatchPrecondition(condition: .notOnQueue(firstExecutor.queue))
dispatchPrecondition(condition: .notOnQueue(secondExecutor.queue))
}
func testDisablingTaskExecutorPreference(_ firstExecutor: MyTaskExecutor,
_ secondExecutor: MyTaskExecutor) async {
dispatchPrecondition(condition: .notOnQueue(firstExecutor.queue))
dispatchPrecondition(condition: .notOnQueue(secondExecutor.queue))
await withTaskExecutorPreference(firstExecutor) {
dispatchPrecondition(condition: .onQueue(firstExecutor.queue))
dispatchPrecondition(condition: .notOnQueue(secondExecutor.queue))
await withTaskExecutorPreference(globalConcurrentExecutor) {
dispatchPrecondition(condition: .notOnQueue(firstExecutor.queue))
dispatchPrecondition(condition: .notOnQueue(secondExecutor.queue))
print("OK: withTaskExecutorPreference(globalConcurrentExecutor) { ... }")
} // on second
await withTaskExecutorPreference(nil) { // no specific preference == okey to inherit
dispatchPrecondition(condition: .onQueue(firstExecutor.queue))
dispatchPrecondition(condition: .notOnQueue(secondExecutor.queue))
print("OK: withTaskExecutorPreference(nil) { ... }")
} // on second
dispatchPrecondition(condition: .onQueue(firstExecutor.queue))
dispatchPrecondition(condition: .notOnQueue(secondExecutor.queue))
} // on first
}
func testGetCurrentTaskExecutor(_ firstExecutor: MyTaskExecutor,
_ secondExecutor: MyTaskExecutor) async {
_ = await Task {
withUnsafeCurrentTask { task in
precondition(nil == task!.unownedTaskExecutor, "unexpected task executor value, should be nil")
}
}.value
await withTaskExecutorPreference(firstExecutor) {
withUnsafeCurrentTask { task in
guard let task else {
fatalError("Missing task?")
}
guard let currentTaskExecutor = task.unownedTaskExecutor else {
fatalError("Expected to have task executor")
}
// Test that we can compare UnownedExecutors:
precondition(currentTaskExecutor == firstExecutor.asUnownedTaskExecutor())
print("OK: currentTaskExecutor == firstExecutor.asUnownedTaskExecutor()")
}
}
}
@main struct Main {
static func main() async {
let firstExecutor = MyTaskExecutor(queue: DispatchQueue(label: "first"))
let secondExecutor = MyTaskExecutor(queue: DispatchQueue(label: "second"))
// === nonisolated func
await Task(executorPreference: firstExecutor) {
await nonisolatedAsyncMethod(expectedOn: firstExecutor)
}.value
// We properly hop back to the main executor from the nonisolated func which used a a task executor
MainActor.preconditionIsolated()
dispatchPrecondition(condition: .onQueue(DispatchQueue.main))
await testNestingWithExecutorMainActor(firstExecutor, secondExecutor)
await testNestingWithExecutorNonisolated(firstExecutor, secondExecutor)
await testDisablingTaskExecutorPreference(firstExecutor, secondExecutor)
await testGetCurrentTaskExecutor(firstExecutor, secondExecutor)
}
}
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