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The main purpose of the low-level [PortMap] is to coordinate between ports being opened & closed and concurrent message senders. That's the only thing it should do. Each isolate owns [ReceivePort]s. Only the isolate mutator can create ports, delete them or change their "keeps-isolate-alive" state. Right now it requires going via [PortMap] (which acquires lock) and [MessageHandler] (which acquires lock) to change the "keeps-isolate-alive" state of a port. We'll move information whether a dart [ReceivePort] is closed and whether it keeps the isolate alive into the [ReceivePort] object itself. => Changing the "keeps-isolate-alive" state of the port no longer requires any locks. We could even avoid the runtime call itself in a future CL. Isolates are kept alive if there's any open receive ports (that have not been marked as "does not keep isolate alive"). This is a property of an isolate not of the message handler. For native message handlers we do have a 1<->1 correspondence between port and handler (i.e. there's no "number of open ports" tracking needed). => We'll move the logic of counting open receive ports and ports that keep the isolate alive to the [Isolate]. => We'll also remove locking around incrementing/decrementing or accessing the counts. => The [IsolateMessageHandler] will ask the [Isolate] whether there's any open ports for determining whether to shut down. => For native ports, the `Dart_NewNativePort()` & `Dart_CloseNativePort()` functions will manage the lifetime (as their name also suggests). Overall this makes the [Isolate] responsible for creation of dart [ReceivePort]s and tracking whether the isolate should be kept alive: * Isolate::CreateReceivePort() * Isolate::SetReceivePortKeepAliveState() * Isolate::CloseReceivePort() TEST=ci Change-Id: I847ae357c26254d3810cc277962e05deca18a1de Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/317960 Reviewed-by: Alexander Aprelev <aam@google.com> Reviewed-by: Ryan Macnak <rmacnak@google.com> Commit-Queue: Martin Kustermann <kustermann@google.com>
39 lines
1.1 KiB
C++
39 lines
1.1 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef RUNTIME_VM_NATIVE_MESSAGE_HANDLER_H_
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#define RUNTIME_VM_NATIVE_MESSAGE_HANDLER_H_
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#include "include/dart_api.h"
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#include "include/dart_native_api.h"
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#include "vm/message_handler.h"
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namespace dart {
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// A NativeMessageHandler accepts messages and dispatches them to
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// native C handlers.
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class NativeMessageHandler : public MessageHandler {
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public:
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NativeMessageHandler(const char* name, Dart_NativeMessageHandler func);
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~NativeMessageHandler();
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const char* name() const { return name_; }
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Dart_NativeMessageHandler func() const { return func_; }
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MessageStatus HandleMessage(std::unique_ptr<Message> message);
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#if defined(DEBUG)
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// Check that it is safe to access this handler.
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void CheckAccess() const;
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#endif
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private:
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char* name_;
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Dart_NativeMessageHandler func_;
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};
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} // namespace dart
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#endif // RUNTIME_VM_NATIVE_MESSAGE_HANDLER_H_
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