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when a task is adding adding new children to a task group, we need to synchronize with the task status record lock of the parent task that has the task group, to prevent races with concurrent cancellation and escalation. Radar-Id: rdar://problem/86311782
54 lines
1.7 KiB
C++
54 lines
1.7 KiB
C++
//===--- TaskGroup.h - ABI structures for task groups -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_GROUP_H
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#define SWIFT_ABI_TASK_GROUP_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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/// The task group is responsible for maintaining dynamically created child tasks.
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class alignas(Alignment_TaskGroup) TaskGroup {
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public:
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// These constructors do not initialize the group instance, and the
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// destructor does not destroy the group instance; you must call
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// swift_taskGroup_{initialize,destroy} yourself.
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constexpr TaskGroup()
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: PrivateData{} {}
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void *PrivateData[NumWords_TaskGroup];
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/// Upon a future task's completion, offer it to the task group it belongs to.
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void offer(AsyncTask *completed, AsyncContext *context);
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/// Checks the cancellation status of the group.
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bool isCancelled();
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// Add a child task to the group. Always called with the status record lock of
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// the parent task held
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void addChildTask(AsyncTask *task);
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};
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} // end namespace swift
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#endif // SWIFT_ABI_TASK_GROUP_H
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