chromium/v8/include/v8-microtask-queue.h

// Copyright 2021 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef INCLUDE_V8_MICROTASKS_QUEUE_H_
#define INCLUDE_V8_MICROTASKS_QUEUE_H_

#include <stddef.h>

#include <memory>

#include "v8-local-handle.h"  // NOLINT(build/include_directory)
#include "v8-microtask.h"     // NOLINT(build/include_directory)
#include "v8config.h"         // NOLINT(build/include_directory)

namespace v8 {

class Function;

namespace internal {
class Isolate;
class MicrotaskQueue;
}  // namespace internal

/**
 * Represents the microtask queue, where microtasks are stored and processed.
 * https://html.spec.whatwg.org/multipage/webappapis.html#microtask-queue
 * https://html.spec.whatwg.org/multipage/webappapis.html#enqueuejob(queuename,-job,-arguments)
 * https://html.spec.whatwg.org/multipage/webappapis.html#perform-a-microtask-checkpoint
 *
 * A MicrotaskQueue instance may be associated to multiple Contexts by passing
 * it to Context::New(), and they can be detached by Context::DetachGlobal().
 * The embedder must keep the MicrotaskQueue instance alive until all associated
 * Contexts are gone or detached.
 *
 * Use the same instance of MicrotaskQueue for all Contexts that may access each
 * other synchronously. E.g. for Web embedding, use the same instance for all
 * origins that share the same URL scheme and eTLD+1.
 */
class V8_EXPORT MicrotaskQueue { … };

/**
 * This scope is used to control microtasks when MicrotasksPolicy::kScoped
 * is used on Isolate. In this mode every non-primitive call to V8 should be
 * done inside some MicrotasksScope.
 * Microtasks are executed when topmost MicrotasksScope marked as kRunMicrotasks
 * exits.
 * kDoNotRunMicrotasks should be used to annotate calls not intended to trigger
 * microtasks.
 */
class V8_EXPORT V8_NODISCARD MicrotasksScope { … };

}  // namespace v8

#endif  // INCLUDE_V8_MICROTASKS_QUEUE_H_