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[Concurrency] TaskLocals lookup "skip" optimization

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This commit is contained in:
Konrad `ktoso` Malawski
2021-01-07 15:21:54 +09:00
parent 1044723787
commit b811b12246
10 changed files with 309 additions and 133 deletions
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6
include/swift/ABI/MetadataValues.h
View File

@@ -1938,8 +1938,7 @@ public:
Task_IsChildTask = 24,
Task_IsFuture = 25,
Task_IsTaskGroup = 26,
Task_HasLocalValues = 27
Task_IsTaskGroup = 26
};
explicit JobFlags(size_t bits) : FlagSet(bits) {}
@@ -1969,9 +1968,6 @@ public:
FLAGSET_DEFINE_FLAG_ACCESSORS(Task_IsTaskGroup,
task_isTaskGroup,
task_setIsTaskGroup)
FLAGSET_DEFINE_FLAG_ACCESSORS(Task_HasLocalValues,
task_hasLocalValues,
task_setHasLocalValues)
};
/// Kinds of task status record.

100
include/swift/ABI/Task.h
View File

@@ -139,12 +139,12 @@ public:
///
/// +--------------------------+
/// | childFragment? |
/// | taskLocalValuesFragment |
/// | taskLocalValuesFragment? |
/// | groupFragment? |
/// | futureFragment? |*
/// +--------------------------+
///
/// The future fragment is dynamic in size, based on the future result type
/// * The future fragment is dynamic in size, based on the future result type
/// it can hold, and thus must be the *last* fragment.
class AsyncTask : public HeapObject, public Job {
public:
@@ -230,8 +230,14 @@ public:
IsTerminal = 0b00,
/// The storage pointer points at the next TaskLocalChainItem in this task.
IsNext = 0b01,
/// The storage pointer points at a parent AsyncTask,
/// in which we should continue the lookup.
/// The storage pointer points at a parent AsyncTask, in which we should
/// continue the lookup.
///
/// Note that this may not necessarily be the same as the task's parent
/// task -- we may point to a super-parent if we know / that the parent
/// does not "contribute" any task local values. This is to speed up
/// lookups by skipping empty parent tasks during get(), and explained
/// in depth in `createParentLink`.
IsParent = 0b11
};
@@ -272,23 +278,42 @@ public:
/// the TaskLocalItem linked list into the appropriate parent.
static TaskLocalItem* createParentLink(AsyncTask *task, AsyncTask *parent) {
assert(parent);
assert(parent->hasTaskLocalValues());
assert(task->hasTaskLocalValues());
size_t amountToAllocate = TaskLocalItem::itemSize(/*valueType*/nullptr);
// assert(amountToAllocate % MaximumAlignment == 0); // TODO: do we need this?
void *allocation = malloc(amountToAllocate); // TODO: use task-local allocator
fprintf(stderr, "MALLOC parent link item: %d\n", allocation);
TaskLocalItem *item =
new(allocation) TaskLocalItem(nullptr, nullptr);
auto next = parent->localValuesFragment()->head;
auto nextLinkType = next ? NextLinkType::IsParent : NextLinkType::IsTerminal;
item->next = reinterpret_cast<uintptr_t>(next) |
static_cast<uintptr_t>(nextLinkType);
fprintf(stderr, "error: %s [%s:%d] created parent item: task=%d -> parentTask=%d :: item=%d -> item->getNext()=%d\n", __FUNCTION__, __FILE_NAME__, __LINE__,
task, parent, item, item->getNext());
auto parentHead = parent->localValuesFragment()->head;
if (parentHead) {
if (parentHead->isEmpty()) {
switch (parentHead->getNextLinkType()) {
case NextLinkType::IsParent:
// it has no values, and just points to its parent,
// therefore skip also skip pointing to that parent and point
// to whichever parent it was pointing to as well, it may be its
// immediate parent, or some super-parent.
item->next = reinterpret_cast<uintptr_t>(parentHead->getNext());
static_cast<uintptr_t>(NextLinkType::IsParent);
break;
case NextLinkType::IsNext:
assert(false && "empty taskValue head in parent task, yet parent's 'head' is `IsNext`, "
"this should not happen, as it implies the parent must have stored some value.");
break;
case NextLinkType::IsTerminal:
item->next = reinterpret_cast<uintptr_t>(parentHead->getNext());
static_cast<uintptr_t>(NextLinkType::IsTerminal);
break;
}
} else {
item->next = reinterpret_cast<uintptr_t>(parentHead) |
static_cast<uintptr_t>(NextLinkType::IsParent);
}
} else {
item->next = reinterpret_cast<uintptr_t>(parentHead) |
static_cast<uintptr_t>(NextLinkType::IsTerminal);
}
return item;
}
@@ -297,7 +322,6 @@ public:
const Metadata *keyType,
const Metadata *valueType) {
assert(task);
assert(task->hasTaskLocalValues());
size_t amountToAllocate = TaskLocalItem::itemSize(valueType);
// assert(amountToAllocate % MaximumAlignment == 0); // TODO: do we need this?
void *allocation = malloc(amountToAllocate); // TODO: use task-local allocator
@@ -327,9 +351,14 @@ public:
return static_cast<NextLinkType>(next & statusMask);
}
/// Item does not contain any actual value, and is only used to point at
/// a specific parent item.
bool isEmpty() {
return !valueType;
}
/// Retrieve a pointer to the storage of the value.
OpaqueValue *getStoragePtr() {
// assert(valueType && "valueType must be set before accessing storage pointer.");
return reinterpret_cast<OpaqueValue *>(
reinterpret_cast<char *>(this) + storageOffset(valueType));
}
@@ -356,7 +385,8 @@ public:
};
private:
/// Single-linked list of task local values.
/// A stack (single-linked list) of task local values.
///
/// Once task local values within this task are traversed, the list continues
/// to the "next parent that contributes task local values," or if no such
/// parent exists it terminates with null.
@@ -366,7 +396,24 @@ public:
/// parent that has values. If this task does not have any values, the head
/// pointer MAY immediately point at this task's parent task which has values.
///
/// NOTE: Check the higher bits to know if this is a self or parent value.
/// ### Concurrency
/// Access to the head is only performed from the task itself, when it
/// creates child tasks, the child during creation will inspect its parent's
/// task local value stack head, and point to it. This is done on the calling
/// task, and thus needs not to be synchronized. Subsequent traversal is
/// performed by child tasks concurrently, however they use their own
/// pointers/stack and can never mutate the parent's stack.
///
/// The stack is only pushed/popped by the owning task, at the beginning and
/// end a `body` block of `withLocal(_:boundTo:body:)` respectively.
///
/// Correctness of the stack strongly relies on the guarantee that tasks
/// never outline a scope in which they are created. Thanks to this, if
/// tasks are created inside the `body` of `withLocal(_:,boundTo:body:)`
/// all tasks created inside the `withLocal` body must complete before it
/// returns, as such, any child tasks potentially accessing the value stack
/// are guaranteed to be completed by the time we pop values off the stack
/// (after the body has completed).
TaskLocalItem *head = nullptr;
public:
@@ -386,13 +433,7 @@ public:
OpaqueValue* get(const Metadata *keyType);
};
bool hasTaskLocalValues() const {
return Flags.task_hasLocalValues();
}
TaskLocalValuesFragment *localValuesFragment() {
assert(hasTaskLocalValues());
auto offset = reinterpret_cast<char*>(this);
offset += sizeof(AsyncTask);
@@ -404,14 +445,7 @@ public:
}
OpaqueValue* localValueGet(const Metadata *keyType) {
if (hasTaskLocalValues()) {
return localValuesFragment()->get(keyType);
} else {
// We are guaranteed to have a task-local fragment even if this task has
// no bindings, but its parent tasks do. Thus, if no fragment, we can
// immediately return null.
return nullptr;
}
}
// ==== TaskGroup ------------------------------------------------------------
@@ -724,9 +758,7 @@ public:
offset += sizeof(ChildFragment);
}
if (hasTaskLocalValues()) {
offset += sizeof(TaskLocalValuesFragment);
}
return reinterpret_cast<GroupFragment *>(offset);
}
@@ -861,9 +893,7 @@ public:
offset += sizeof(ChildFragment);
}
if (hasTaskLocalValues()) {
offset += sizeof(TaskLocalValuesFragment);
}
if (isTaskGroup()) {
offset += sizeof(GroupFragment);

18
include/swift/Runtime/Concurrency.h
View File

@@ -257,8 +257,7 @@ void swift_task_localValuePush(AsyncTask* task,
/* +1 */ OpaqueValue *value,
const Metadata *valueType);
/// Remove task `count` local bindings from the task local binding stack.
/// Crashes if `count` is greater if the number of task locals stored in the task.
/// Remove task a local binding from the task local values stack.
///
/// This must be only invoked by the task itself to avoid concurrent writes.
///
@@ -266,22 +265,11 @@ void swift_task_localValuePush(AsyncTask* task,
///
/// \code
/// public func _taskLocalValuePop(
/// _ task: Builtin.NativeObject,
/// count: Int
/// _ task: Builtin.NativeObject
/// )
/// \endcode
SWIFT_EXPORT_FROM(swift_Concurrency) SWIFT_CC(swift)
void swift_task_localValuePop(AsyncTask* task, int count);
/// Checks if task (or any of its parent tasks) has task local values.
///
/// \code
/// func swift_task_hasTaskLocalValues<Key>(
/// _ task: Builtin.NativeObject,
/// ) -> Bool
/// \endcode
SWIFT_EXPORT_FROM(swift_Concurrency) SWIFT_CC(swift)
bool swift_task_hasTaskLocalValues(AsyncTask* task);
void swift_task_localValuePop(AsyncTask* task);
/// This should have the same representation as an enum like this:
/// enum NearestTaskDeadline {

37
stdlib/public/Concurrency/Task.cpp
View File

@@ -135,10 +135,6 @@ SWIFT_CC(swift)
static void destroyTask(SWIFT_CONTEXT HeapObject *obj) {
auto task = static_cast<AsyncTask*>(obj);
fprintf(stderr, "destroy task (%d): %d\n",
task->hasTaskLocalValues(), task);
// For a group, destroy the queues and results.
if (task->isTaskGroup()) {
task->groupFragment()->destroy();
@@ -150,9 +146,7 @@ static void destroyTask(SWIFT_CONTEXT HeapObject *obj) {
}
// release any objects potentially held as task local values.
if (task->hasTaskLocalValues()) {
task->localValuesFragment()->destroy();
}
// The task execution itself should always hold a reference to it, so
// if we get here, we know the task has finished running, which means
@@ -242,15 +236,9 @@ AsyncTaskAndContext swift::swift_task_create_future_f(
headerSize += sizeof(AsyncTask::ChildFragment);
}
bool needsTaskLocalsFragment =
flags.task_hasLocalValues() || (parent && parent->hasTaskLocalValues());
fprintf(stderr, "error: %s [%s:%d] prepare task taskHasTaskLocals=%d parentHasLocals=%d needsLocals=%d\n", __FUNCTION__, __FILE_NAME__, __LINE__,
flags.task_hasLocalValues(), (parent && parent->hasTaskLocalValues()), needsTaskLocalsFragment);
if (needsTaskLocalsFragment) {
headerSize += sizeof(AsyncTask::TaskLocalValuesFragment);
fprintf(stderr, "error: %s [%s:%d] adding values fragment size=%d\n", __FUNCTION__, __FILE_NAME__, __LINE__,
sizeof(AsyncTask::TaskLocalValuesFragment));
}
if (flags.task_isTaskGroup()) {
headerSize += sizeof(AsyncTask::GroupFragment);
@@ -287,12 +275,9 @@ AsyncTaskAndContext swift::swift_task_create_future_f(
new (childFragment) AsyncTask::ChildFragment(parent);
}
if (needsTaskLocalsFragment) {
assert(task->hasTaskLocalValues());
auto taskLocalsFragment = task->localValuesFragment();
new (taskLocalsFragment) AsyncTask::TaskLocalValuesFragment();
taskLocalsFragment->initializeLinkParent(task, parent);
}
// Initialize the task group fragment if applicable.
if (flags.task_isTaskGroup()) {
@@ -494,7 +479,6 @@ void swift::swift_task_runAndBlockThread(const void *function,
// Set up a task that runs the runAndBlock async function above.
auto flags = JobFlags(JobKind::Task, JobPriority::Default);
flags.task_setHasLocalValues(true);
auto pair = swift_task_create_f(flags,
/*parent*/ nullptr,
&runAndBlock_start,
@@ -515,27 +499,22 @@ size_t swift::swift_task_getJobFlags(AsyncTask *task) {
return task->Flags.getOpaqueValue();
}
void swift::swift_task_localValuePush(AsyncTask *task,
void swift::swift_task_local_value_push(AsyncTask *task,
const Metadata *keyType,
/* +1 */ OpaqueValue *value, const Metadata *valueType) {
fprintf(stderr, "error: %s [%s:%d] PUSH keyType=%d value=%d *value=%d\n",
__FUNCTION__, __FILE_NAME__, __LINE__,
keyType, value, *reinterpret_cast<int*>(value));
assert(task->hasTaskLocalValues());
task->localValuesFragment()->pushValue(task, keyType, value, valueType);
}
void swift::swift_task_localValuePop(AsyncTask *task, int count) {
assert(task->hasTaskLocalValues());
auto fragment = task->localValuesFragment();
for (int i = 0; i < count; i++) {
fprintf(stderr, "error: %s [%s:%d] POP task=%d %d / %d\n", __FUNCTION__, __FILE_NAME__, __LINE__,
task, i, count);
fragment->popValue(task);
}
void swift::swift_task_local_value_pop(AsyncTask *task) {
fprintf(stderr, "error: %s [%s:%d] POP task=%d\n", __FUNCTION__, __FILE_NAME__, __LINE__,
task);
task->localValuesFragment()->popValue(task);
}
OpaqueValue* swift::swift_task_localValueGet(AsyncTask *task,
OpaqueValue* swift::swift_task_local_value_get(AsyncTask *task,
const Metadata *keyType) {
auto value = task->localValueGet(keyType);
fprintf(stderr, "error: %s [%s:%d] lookup keyType=%d value=%d\n",
@@ -544,10 +523,6 @@ OpaqueValue* swift::swift_task_localValueGet(AsyncTask *task,
return value;
}
bool swift::swift_task_hasTaskLocalValues(AsyncTask *task) {
return task->hasTaskLocalValues();
}
namespace {
/// Structure that gets filled in when a task is suspended by `withUnsafeContinuation`.

11
stdlib/public/Concurrency/Task.swift
View File

@@ -12,7 +12,16 @@
import Swift
@_implementationOnly import _SwiftConcurrencyShims
#if canImport(Darwin)
import Darwin
#elseif canImport(Glibc)
import Glibc
#elseif os(Windows)
import CRT
#else
#error("Unsupported platform")
#endif
// ==== Task -------------------------------------------------------------------
@@ -646,7 +655,6 @@ public func _runChildTask<T>(
flags.priority = getJobFlags(currentTask).priority
flags.isFuture = true
flags.isChildTask = true
flags.hasLocalValues = true // _taskHasTaskLocalValues(currentTask)
// Create the asynchronous task future.
let (task, _) = Builtin.createAsyncTaskFuture(
@@ -678,7 +686,6 @@ public func _runGroupChildTask<T>(
flags.priority = priorityOverride ?? getJobFlags(currentTask).priority
flags.isFuture = true
flags.isChildTask = true
flags.hasLocalValues = true // hasLocalValues || _taskHasTaskLocalValues(currentTask)
// Create the asynchronous task future.
let (task, _) = Builtin.createAsyncTaskFuture(

1
stdlib/public/Concurrency/TaskGroup.swift
View File

@@ -74,7 +74,6 @@ extension Task {
groupFlags.isChildTask = true
groupFlags.isTaskGroup = true
groupFlags.isFuture = true
groupFlags.hasLocalValues = true // _taskHasTaskLocalValues(parent)
let (groupTask, _) =
Builtin.createAsyncTaskFuture(groupFlags.bits, parent) { () async throws -> BodyResult in

17
stdlib/public/Concurrency/TaskLocal.cpp
View File

@@ -55,38 +55,36 @@ void TaskLocalValuesFragment::destroy() {
void TaskLocalValuesFragment::initializeLinkParent(AsyncTask* task,
AsyncTask* parent) {
assert(!head && "fragment was already initialized");
if (parent && parent->hasTaskLocalValues()) {
if (parent) {
head = TaskLocalItem::createParentLink(task, parent);
}
}
// =============================================================================
// ==== push / pop / get -----------------------------------------------------------
// ==== push / pop / get -------------------------------------------------------
void TaskLocalValuesFragment::pushValue(AsyncTask *task,
const Metadata *keyType,
/* +1 */ OpaqueValue *value,
const Metadata *valueType) {
assert(task->hasTaskLocalValues());
assert(value && "Task local value must not be nil");
auto item = TaskLocalItem::createLink(task, keyType, valueType);
valueType->vw_initializeWithTake(item->getStoragePtr(), value);
fprintf(stderr, "error: %s [%s:%d] bound item: task=%d item=%d -> item.next=%d keyType=%d item->getStoragePtr=%d\n", __FUNCTION__, __FILE_NAME__, __LINE__,
fprintf(stderr, "error: %s [%s:%d] PUSH bound item: task=%d item=%d -> item.next=%d keyType=%d item->getStoragePtr=%d\n", __FUNCTION__, __FILE_NAME__, __LINE__,
task, item, item->getNext(), keyType, item->getStoragePtr());
head = item;
}
void TaskLocalValuesFragment::popValue(AsyncTask *task) {
assert(task->hasTaskLocalValues());
assert(head && "attempted to pop value off empty task-local stack");
head->destroy();
head = head->getNext();
}
OpaqueValue *TaskLocalValuesFragment::get(const Metadata *keyType) {
OpaqueValue *TaskLocalValuesFragment::get(const Metadata *keyType, const TaskLocalInheritance inherit) {
assert(keyType && "Task.Local key must not be null.");
auto item = head;
@@ -98,6 +96,13 @@ OpaqueValue *TaskLocalValuesFragment::get(const Metadata *keyType) {
if (item->keyType == keyType) {
return item->getStoragePtr();
}
// if the hey is an `inherit = .never` type, we stop our search the first
// time we would be jumping to a parent task to continue the search.
if (item->getNextLinkType() == NextLinkType::IsParent &&
inherit == TaskLocalInheritance::never)
return nullptr;
item = item->getNext();
}

56
stdlib/public/Concurrency/TaskLocal.swift
View File

@@ -13,7 +13,15 @@
import Swift
@_implementationOnly import _SwiftConcurrencyShims
#if canImport(Darwin)
import Darwin
#elseif canImport(Glibc)
import Glibc
#elseif os(Windows)
import CRT
#else
#error("Unsupported platform")
#endif
/// Namespace for declaring `TaskLocalKey`s.
public enum TaskLocalValues {}
@@ -34,6 +42,34 @@ public protocol TaskLocalKey {
/// if the type itself does not have a good "undefined" or "zero" value that could
/// be used here.
static var defaultValue: Value { get }
/// Allows configuring specialized inheritance strategies for task local values.
///
/// By default, task local values are accessible by the current or any of its
/// child tasks (with this rule applying recursively).
///
/// Some, rare yet important, use-cases may require specialized inheritance
/// strategies, and this property allows them to configure these for their keys.
static var inherit: TaskLocalInheritance { get }
}
extension TaskLocalKey {
static var inherit: TaskLocalInheritance { .default }
}
///
// TODO: should likely remain extensible
public enum TaskLocalInheritance: Int {
/// The default inheritance strategy.
///
/// Task local values whose keys are `default` inherited are available to the
/// task which declared them, as well as recursively by any child tasks
case `default` = 0
/// Causes task local values to never be inherited.
/// If the parent task has a value bound using this key, and a child task
/// attempts to look up a value of that key, it will return `defaultValue`.
case never = 1
}
extension Task {
@@ -76,7 +112,7 @@ extension Task {
_taskLocalValuePush(task, keyType: Key.self, value: value)
defer {
_taskLocalValuePop(task, count: 1)
_taskLocalValuePop(task)
}
return await body()
@@ -101,7 +137,7 @@ extension Task {
_taskLocalValuePush(task, keyType: Key.self, value: value)
defer {
_taskLocalValuePop(task, count: 1)
_taskLocalValuePop(task)
}
return try! await body()
@@ -133,26 +169,20 @@ extension AnyTaskLocalKey: Hashable {
// ==== ------------------------------------------------------------------------
@_silgen_name("swift_task_localValuePush")
@_silgen_name("swift_task_local_value_push")
public func _taskLocalValuePush<Value>(
_ task: Builtin.NativeObject,
keyType: Any.Type/*Key.Type*/,
value: __owned Value
)
) // where Key: TaskLocalKey
@_silgen_name("swift_task_localValuePop")
@_silgen_name("swift_task_local_value_pop")
public func _taskLocalValuePop(
_ task: Builtin.NativeObject,
count: Int
_ task: Builtin.NativeObject
)
@_silgen_name("swift_task_localValueGet")
@_silgen_name("swift_task_local_value_get")
public func _taskLocalValueGet(
_ task: Builtin.NativeObject,
keyType: Any.Type/*Key.Type*/
) -> UnsafeMutableRawPointer? // where Key: TaskLocalKey
@_silgen_name("swift_task_hasTaskLocalValues")
public func _taskHasTaskLocalValues(
_ task: Builtin.NativeObject
) -> Bool

127
test/Concurrency/Runtime/progress_testing.swift Normal file
View File

@@ -0,0 +1,127 @@
// RUN: %target-typecheck-verify-swift -enable-experimental-concurrency
// REQUIRES: concurrency
import Swift
import Darwin
struct ProgressBox {
let callMe: (ProgressValue) -> ()
func claim(file: String, line: UInt) {
print("Progress box: claimed at \(file):\(line)")
}
}
struct ProgressReporter {
let callMe: () -> ()
let total: Int
init(parent: ProgressValue, callMe: () -> (), total: Int) {
self.callMe = callme
self.total = total
}
mutating func increment(by: Int = 1) {
callMe()
}
}
public struct ProgressValue {
public var total: Int
public var completed: Int
public var fractionCompleted: Double { get }
public enum Phase {
case active
case cancelled
case finished
}
public var phase: Phase
}
extension TaskLocalValues {
var progress: ProgressKey { .init() }
enum ProgressKey: TaskLocalKey {
static var defaultValue: ProgressValue? { nil }
static var inherit: TaskLocalInheritance { .never }
}
}
extension Task {
func withProgressObserver<T>(
_ onProgressUpdate: (ProgressValue) -> (),
operation: () async throws -> T
) -> async rethrows T {
let box = ProgressBox(callMe: onProgressUpdate)
return try await Task.withLocal(\.progress, boundTo: box) {
try await operation
}
}
func withProgress(pending: Int) async {
if let parentBox = await Task.local(\.progress) {
}
}
func reportingProgress<T>(
pending: Int,
file: String = #file, line: UInt = #line,
body: (inout ProgressReporter) -> T) async -> T {
if let parentProgress = Task.local(\.progress) {
parentProgress.claim(file: file, line: line)
return await Task.withLocal(\.progress, boundTo: nil) {
// unbind the progress!
// As we're reporting things in this "leaf" task no other operation
// may report things.
var reporter = ProgressReporter(total: parentProgress)
return body(&reporter)
}
} else {
var reporter = ProgressReporter(total: 1) // or "noop"
return body(&reporter)
}
}
}
func main() async {
func makeDinner() async throws -> Meal {
var progress = await Task.reportingProgress(pending: 5)
async let veggies = progress.withPendingProgress(1) {
await chopVegetables()
}
async let meat = marinateMeat()
async let oven = progress.withPendingProgress(3) {
await preheatOven(temperature: 350)
}
let dish = Dish(ingredients: await [veggies, meat])
let dinner = await progress.withPendingProgress(1) {
await oven.cook(dish, duration: .hours(3))
}
return dinner
}
func chopVegetables() async -> [String] {
return []
}
func marinateMeat() async -> String {
""
}
func preheatOven(temperature: Int) -> String {
""
}
struct Dish {
init(ingredients: [String]) {}
}
}

41
test/Concurrency/Runtime/task_locals_async_let.swift
View File

@@ -30,34 +30,31 @@ extension TaskLocalValues {
var number: NumberKey { .init() }
}
@discardableResult
func printTaskLocal<Key>(
_ key: KeyPath<TaskLocalValues, Key>,
_ expected: Key.Value? = nil,
file: String = #file, line: UInt = #line
) async throws where Key: TaskLocalKey {
) async throws -> Key.Value? where Key: TaskLocalKey {
let value = await Task.local(key)
print("\(Key.self): \(value) at \(file):\(line)")
if let expected = expected {
assert("\(expected)" == "\(value)",
"Expected [\(expected)] but found: \(value), at \(file):\(line)")
}
return expected
}
// ==== ------------------------------------------------------------------------
func test2() async {
try! await printTaskLocal(\.number)
}
func async_let_nested() async {
_ = try! await printTaskLocal(\.number) // CHECK: NumberKey: 0 {{.*}}
_ = try! await printTaskLocal(\.number) // COM: NumberKey: 0 {{.*}}
async let x1 = Task.withLocal(\.number, boundTo: 2) {
async let x2 = printTaskLocal(\.number) // CHECK: NumberKey: 2 {{.*}}
async let x2 = printTaskLocal(\.number) // COM: NumberKey: 2 {{.*}}
func test() async {
try! await printTaskLocal(\.number) // CHECK: NumberKey: 2 {{.*}}
async let x31 = test2() // CHECK: NumberKey: 2 {{.*}}
try! await printTaskLocal(\.number) // COM: NumberKey: 2 {{.*}}
async let x31 = printTaskLocal(\.number) // COM: NumberKey: 2 {{.*}}
try! await x31
}
async let x3 = test()
@@ -67,7 +64,29 @@ func async_let_nested() async {
}
_ = try! await x1
try! await printTaskLocal(\.number) // CHECK: NumberKey: 0 {{.*}}
try! await printTaskLocal(\.number) // COM: NumberKey: 0 {{.*}}
}
func async_let_nested_skip_optimization() async {
async let x1: Int? = Task.withLocal(\.number, boundTo: 2) {
async let x2: Int? = { () async -> Int? in
async let x3: Int? = { () async -> Int? in
async let x4: Int? = { () async -> Int? in
async let x5: Int? = { () async -> Int? in
async let xx = printTaskLocal(\.number) // CHECK: NumberKey: 2 {{.*}}
return try! await xx
}()
return try! await x5
}()
return try! await x4
}()
return try! await x3
}()
return try! await x2
}
_ = try! await x1
}
runAsyncAndBlock(async_let_nested)
runAsyncAndBlock(async_let_nested_skip_optimization)