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53 lines
1.8 KiB
C++
53 lines
1.8 KiB
C++
//===--- AsyncLet.h - ABI structures for async let -00-----------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2020 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// Swift ABI describing task groups.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_ABI_TASK_ASYNC_LET_H
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#define SWIFT_ABI_TASK_ASYNC_LET_H
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#include "swift/ABI/Task.h"
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#include "swift/ABI/HeapObject.h"
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#include "swift/Runtime/Concurrency.h"
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#include "swift/Runtime/Config.h"
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#include "swift/Basic/RelativePointer.h"
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#include "swift/Basic/STLExtras.h"
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namespace swift {
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/// Represents an in-flight `async let`, i.e. the Task that is computing the
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/// result of the async let, along with the awaited status and other metadata.
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class alignas(Alignment_AsyncLet) AsyncLet {
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public:
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// These constructors do not initialize the AsyncLet instance, and the
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// destructor does not destroy the AsyncLet instance; you must call
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// swift_asyncLet_{start,end} yourself.
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constexpr AsyncLet()
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: PrivateData{} {}
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// FIXME: not sure how many words we should reserve
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void *PrivateData[NumWords_AsyncLet];
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// TODO: we could offer a "was awaited on" check here
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/// Returns the child task that is associated with this async let.
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/// The tasks completion is used to fulfil the value represented by this async let.
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AsyncTask *getTask() const;
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};
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} // end namespace swift
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#endif // SWIFT_ABI_TASK_ASYNC_LET_H
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