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98 lines
3.2 KiB
C++
98 lines
3.2 KiB
C++
//===--- TaskLocal.cpp - Task Local Values --------------------------------===//
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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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#include "swift/Runtime/Concurrency.h"
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#include "swift/ABI/Task.h"
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#include "swift/ABI/Metadata.h"
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using namespace swift;
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using TaskLocalValuesFragment = AsyncTask::TaskLocalValuesFragment;
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// =============================================================================
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// ==== destroy ----------------------------------------------------------------
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void TaskLocalValuesFragment::destroy() {
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auto item = head;
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head = nullptr;
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TaskLocalItem *next;
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while (item) {
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switch (item->getNextLinkType()) {
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case TaskLocalValuesFragment::NextLinkType::IsNext:
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next = item->getNext();
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item->destroy();
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free(item);
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item = next;
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break;
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case TaskLocalValuesFragment::NextLinkType::IsParent:
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case TaskLocalValuesFragment::NextLinkType::IsTerminal:
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// we're done here, we must not destroy values owned by the parent task.
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return;
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}
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}
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}
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// =============================================================================
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// ==== Initialization ---------------------------------------------------------
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void TaskLocalValuesFragment::initializeLinkParent(AsyncTask* task,
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AsyncTask* parent) {
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assert(!head && "fragment was already initialized");
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if (parent) {
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head = TaskLocalItem::createParentLink(task, parent);
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}
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}
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// =============================================================================
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// ==== push / pop / get -------------------------------------------------------
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void TaskLocalValuesFragment::pushValue(AsyncTask *task,
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const Metadata *keyType,
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/* +1 */ OpaqueValue *value,
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const Metadata *valueType) {
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assert(value && "Task local value must not be nil");
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auto item = TaskLocalItem::createLink(task, keyType, valueType);
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valueType->vw_initializeWithTake(item->getStoragePtr(), value);
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head = item;
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}
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void TaskLocalValuesFragment::popValue(AsyncTask *task) {
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assert(head && "attempted to pop value off empty task-local stack");
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head->destroy();
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head = head->getNext();
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}
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OpaqueValue *TaskLocalValuesFragment::get(
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const Metadata *keyType,
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const TaskLocalInheritance inherit) {
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assert(keyType && "Task.Local key must not be null.");
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auto item = head;
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while (item) {
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if (item->keyType == keyType) {
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return item->getStoragePtr();
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}
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// if the key is an `inherit = .never` type, we stop our search the first
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// time we would be jumping to a parent task to continue the search.
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if (item->getNextLinkType() == NextLinkType::IsParent &&
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inherit == TaskLocalInheritance::Never)
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return nullptr;
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item = item->getNext();
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}
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return nullptr;
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}
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