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![asiva](/assets/img/avatar_default.png)
TEST=cq Change-Id: I770e1c606c6622e5cb63bca72b74c63ce776ef53 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/210428 Reviewed-by: Ryan Macnak <rmacnak@google.com> Commit-Queue: Siva Annamalai <asiva@google.com>
659 lines
19 KiB
C++
659 lines
19 KiB
C++
// Copyright (c) 2011, 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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#include <utility>
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#include "vm/message_handler.h"
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#include "vm/dart.h"
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#include "vm/heap/safepoint.h"
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#include "vm/isolate.h"
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#include "vm/lockers.h"
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#include "vm/object.h"
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#include "vm/object_store.h"
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#include "vm/os.h"
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#include "vm/port.h"
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#include "vm/thread_interrupter.h"
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namespace dart {
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DECLARE_FLAG(bool, trace_service_pause_events);
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class MessageHandlerTask : public ThreadPool::Task {
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public:
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explicit MessageHandlerTask(MessageHandler* handler) : handler_(handler) {
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ASSERT(handler != NULL);
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}
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virtual void Run() {
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ASSERT(handler_ != NULL);
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handler_->TaskCallback();
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}
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private:
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MessageHandler* handler_;
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DISALLOW_COPY_AND_ASSIGN(MessageHandlerTask);
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};
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// static
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const char* MessageHandler::MessageStatusString(MessageStatus status) {
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switch (status) {
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case kOK:
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return "OK";
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case kError:
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return "Error";
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case kRestart:
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return "Restart";
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case kShutdown:
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return "Shutdown";
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default:
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UNREACHABLE();
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return "Illegal";
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}
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}
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MessageHandler::MessageHandler()
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: queue_(new MessageQueue()),
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oob_queue_(new MessageQueue()),
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oob_message_handling_allowed_(true),
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paused_for_messages_(false),
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live_ports_(0),
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paused_(0),
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#if !defined(PRODUCT)
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should_pause_on_start_(false),
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should_pause_on_exit_(false),
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is_paused_on_start_(false),
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is_paused_on_exit_(false),
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paused_timestamp_(-1),
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#endif
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task_running_(false),
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delete_me_(false),
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pool_(NULL),
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start_callback_(NULL),
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end_callback_(NULL),
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callback_data_(0) {
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ASSERT(queue_ != NULL);
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ASSERT(oob_queue_ != NULL);
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}
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MessageHandler::~MessageHandler() {
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delete queue_;
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delete oob_queue_;
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queue_ = NULL;
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oob_queue_ = NULL;
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pool_ = NULL;
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}
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const char* MessageHandler::name() const {
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return "<unnamed>";
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}
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#if defined(DEBUG)
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void MessageHandler::CheckAccess() {
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// By default there is no checking.
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}
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#endif
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void MessageHandler::MessageNotify(Message::Priority priority) {
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// By default, there is no custom message notification.
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}
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bool MessageHandler::Run(ThreadPool* pool,
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StartCallback start_callback,
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EndCallback end_callback,
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CallbackData data) {
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MonitorLocker ml(&monitor_);
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if (FLAG_trace_isolates) {
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OS::PrintErr(
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"[+] Starting message handler:\n"
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"\thandler: %s\n",
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name());
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}
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ASSERT(pool_ == NULL);
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ASSERT(!delete_me_);
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pool_ = pool;
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start_callback_ = start_callback;
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end_callback_ = end_callback;
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callback_data_ = data;
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task_running_ = true;
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bool result = pool_->Run<MessageHandlerTask>(this);
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if (!result) {
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pool_ = nullptr;
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start_callback_ = nullptr;
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end_callback_ = nullptr;
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callback_data_ = 0;
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task_running_ = false;
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}
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return result;
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}
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void MessageHandler::PostMessage(std::unique_ptr<Message> message,
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bool before_events) {
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Message::Priority saved_priority;
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{
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MonitorLocker ml(&monitor_);
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if (FLAG_trace_isolates) {
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Isolate* source_isolate = Isolate::Current();
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if (source_isolate != nullptr) {
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OS::PrintErr(
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"[>] Posting message:\n"
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"\tlen: %" Pd "\n\tsource: (%" Pd64
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") %s\n\tdest: %s\n"
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"\tdest_port: %" Pd64 "\n",
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message->Size(), static_cast<int64_t>(source_isolate->main_port()),
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source_isolate->name(), name(), message->dest_port());
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} else {
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OS::PrintErr(
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"[>] Posting message:\n"
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"\tlen: %" Pd
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"\n\tsource: <native code>\n"
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"\tdest: %s\n"
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"\tdest_port: %" Pd64 "\n",
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message->Size(), name(), message->dest_port());
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}
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}
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saved_priority = message->priority();
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if (message->IsOOB()) {
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oob_queue_->Enqueue(std::move(message), before_events);
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} else {
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queue_->Enqueue(std::move(message), before_events);
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}
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if (paused_for_messages_) {
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ml.Notify();
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}
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if (pool_ != nullptr && !task_running_) {
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ASSERT(!delete_me_);
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task_running_ = true;
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const bool launched_successfully = pool_->Run<MessageHandlerTask>(this);
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ASSERT(launched_successfully);
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}
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}
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// Invoke any custom message notification.
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MessageNotify(saved_priority);
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}
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std::unique_ptr<Message> MessageHandler::DequeueMessage(
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Message::Priority min_priority) {
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// TODO(turnidge): Add assert that monitor_ is held here.
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std::unique_ptr<Message> message = oob_queue_->Dequeue();
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if ((message == nullptr) && (min_priority < Message::kOOBPriority)) {
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message = queue_->Dequeue();
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}
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return message;
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}
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void MessageHandler::ClearOOBQueue() {
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oob_queue_->Clear();
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}
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MessageHandler::MessageStatus MessageHandler::HandleMessages(
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MonitorLocker* ml,
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bool allow_normal_messages,
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bool allow_multiple_normal_messages) {
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ASSERT(monitor_.IsOwnedByCurrentThread());
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// Scheduling of the mutator thread during the isolate start can cause this
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// thread to safepoint.
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// We want to avoid holding the message handler monitor during the safepoint
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// operation to avoid possible deadlocks, which can occur if other threads are
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// sending messages to this message handler.
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//
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// If isolate() returns nullptr [StartIsolateScope] does nothing.
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ml->Exit();
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StartIsolateScope start_isolate(isolate());
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ml->Enter();
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auto idle_time_handler =
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isolate() != nullptr ? isolate()->group()->idle_time_handler() : nullptr;
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MessageStatus max_status = kOK;
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Message::Priority min_priority =
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((allow_normal_messages && !paused()) ? Message::kNormalPriority
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: Message::kOOBPriority);
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std::unique_ptr<Message> message = DequeueMessage(min_priority);
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while (message != nullptr) {
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intptr_t message_len = message->Size();
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if (FLAG_trace_isolates) {
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OS::PrintErr(
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"[<] Handling message:\n"
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"\tlen: %" Pd
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"\n"
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"\thandler: %s\n"
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"\tport: %" Pd64 "\n",
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message_len, name(), message->dest_port());
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}
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// Release the monitor_ temporarily while we handle the message.
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// The monitor was acquired in MessageHandler::TaskCallback().
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ml->Exit();
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Message::Priority saved_priority = message->priority();
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Dart_Port saved_dest_port = message->dest_port();
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MessageStatus status = kOK;
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{
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DisableIdleTimerScope disable_idle_timer(idle_time_handler);
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status = HandleMessage(std::move(message));
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}
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if (status > max_status) {
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max_status = status;
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}
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ml->Enter();
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if (FLAG_trace_isolates) {
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OS::PrintErr(
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"[.] Message handled (%s):\n"
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"\tlen: %" Pd
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"\n"
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"\thandler: %s\n"
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"\tport: %" Pd64 "\n",
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MessageStatusString(status), message_len, name(), saved_dest_port);
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}
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// If we are shutting down, do not process any more messages.
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if (status == kShutdown) {
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ClearOOBQueue();
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break;
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}
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// Remember time since the last message. Don't consider OOB messages so
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// using Observatory doesn't trigger additional idle tasks.
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if ((FLAG_idle_timeout_micros != 0) &&
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(saved_priority == Message::kNormalPriority)) {
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if (idle_time_handler != nullptr) {
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idle_time_handler->UpdateStartIdleTime();
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}
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}
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// Some callers want to process only one normal message and then quit. At
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// the same time it is OK to process multiple OOB messages.
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if ((saved_priority == Message::kNormalPriority) &&
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!allow_multiple_normal_messages) {
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// We processed one normal message. Allow no more.
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allow_normal_messages = false;
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}
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// Reevaluate the minimum allowable priority. The paused state
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// may have changed as part of handling the message. We may also
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// have encountered an error during message processing.
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//
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// Even if we encounter an error, we still process pending OOB
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// messages so that we don't lose the message notification.
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min_priority = (((max_status == kOK) && allow_normal_messages && !paused())
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? Message::kNormalPriority
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: Message::kOOBPriority);
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message = DequeueMessage(min_priority);
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}
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return max_status;
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}
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MessageHandler::MessageStatus MessageHandler::HandleNextMessage() {
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// We can only call HandleNextMessage when this handler is not
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// assigned to a thread pool.
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MonitorLocker ml(&monitor_);
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ASSERT(pool_ == NULL);
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ASSERT(!delete_me_);
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#if defined(DEBUG)
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CheckAccess();
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#endif
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return HandleMessages(&ml, true, false);
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}
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MessageHandler::MessageStatus MessageHandler::PauseAndHandleAllMessages(
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int64_t timeout_millis) {
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MonitorLocker ml(&monitor_, /*no_safepoint_scope=*/false);
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ASSERT(task_running_);
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ASSERT(!delete_me_);
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#if defined(DEBUG)
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CheckAccess();
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#endif
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paused_for_messages_ = true;
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while (queue_->IsEmpty() && oob_queue_->IsEmpty()) {
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Monitor::WaitResult wr;
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{
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// Ensure this thread is at a safepoint while we wait for new messages to
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// arrive.
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TransitionVMToNative transition(Thread::Current());
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wr = ml.Wait(timeout_millis);
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}
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ASSERT(task_running_);
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ASSERT(!delete_me_);
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if (wr == Monitor::kTimedOut) {
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break;
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}
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if (queue_->IsEmpty()) {
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// There are only OOB messages. Handle them and then continue waiting for
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// normal messages unless there is an error.
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MessageStatus status = HandleMessages(&ml, false, false);
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if (status != kOK) {
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paused_for_messages_ = false;
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return status;
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}
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}
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}
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paused_for_messages_ = false;
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return HandleMessages(&ml, true, true);
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}
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MessageHandler::MessageStatus MessageHandler::HandleOOBMessages() {
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if (!oob_message_handling_allowed_) {
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return kOK;
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}
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MonitorLocker ml(&monitor_);
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ASSERT(!delete_me_);
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#if defined(DEBUG)
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CheckAccess();
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#endif
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return HandleMessages(&ml, false, false);
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}
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#if !defined(PRODUCT)
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bool MessageHandler::ShouldPauseOnStart(MessageStatus status) const {
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Isolate* owning_isolate = isolate();
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if (owning_isolate == NULL) {
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return false;
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}
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// If we are restarting or shutting down, we do not want to honor
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// should_pause_on_start or should_pause_on_exit.
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return (status != MessageHandler::kRestart &&
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status != MessageHandler::kShutdown) &&
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should_pause_on_start() && owning_isolate->is_runnable();
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}
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bool MessageHandler::ShouldPauseOnExit(MessageStatus status) const {
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Isolate* owning_isolate = isolate();
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if (owning_isolate == NULL) {
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return false;
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}
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return (status != MessageHandler::kRestart &&
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status != MessageHandler::kShutdown) &&
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should_pause_on_exit() && owning_isolate->is_runnable();
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}
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#endif
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bool MessageHandler::HasOOBMessages() {
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MonitorLocker ml(&monitor_);
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return !oob_queue_->IsEmpty();
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}
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bool MessageHandler::HasMessages() {
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MonitorLocker ml(&monitor_);
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return !queue_->IsEmpty();
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}
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void MessageHandler::TaskCallback() {
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ASSERT(Isolate::Current() == NULL);
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MessageStatus status = kOK;
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bool run_end_callback = false;
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bool delete_me = false;
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EndCallback end_callback = NULL;
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CallbackData callback_data = 0;
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{
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// We will occasionally release and reacquire this monitor in this
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// function. Whenever we reacquire the monitor we *must* process
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// all pending OOB messages, or we may miss a request for vm
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// shutdown.
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MonitorLocker ml(&monitor_);
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// This method is running on the message handler task. Which means no
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// other message handler tasks will be started until this one sets
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// [task_running_] to false.
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ASSERT(task_running_);
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#if !defined(PRODUCT)
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if (ShouldPauseOnStart(kOK)) {
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if (!is_paused_on_start()) {
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PausedOnStartLocked(&ml, true);
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}
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// More messages may have come in before we (re)acquired the monitor.
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status = HandleMessages(&ml, false, false);
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if (ShouldPauseOnStart(status)) {
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// Still paused.
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ASSERT(oob_queue_->IsEmpty());
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task_running_ = false; // No task in queue.
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return;
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} else {
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PausedOnStartLocked(&ml, false);
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}
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}
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if (is_paused_on_exit()) {
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status = HandleMessages(&ml, false, false);
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if (ShouldPauseOnExit(status)) {
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// Still paused.
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ASSERT(oob_queue_->IsEmpty());
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task_running_ = false; // No task in queue.
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return;
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} else {
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PausedOnExitLocked(&ml, false);
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}
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}
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#endif // !defined(PRODUCT)
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if (status == kOK) {
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if (start_callback_ != nullptr) {
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// Initialize the message handler by running its start function,
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// if we have one. For an isolate, this will run the isolate's
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// main() function.
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//
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// Release the monitor_ temporarily while we call the start callback.
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ml.Exit();
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status = start_callback_(callback_data_);
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ASSERT(Isolate::Current() == NULL);
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start_callback_ = NULL;
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ml.Enter();
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}
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// Handle any pending messages for this message handler.
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if (status != kShutdown) {
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status = HandleMessages(&ml, (status == kOK), true);
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}
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}
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// The isolate exits when it encounters an error or when it no
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// longer has live ports.
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if (status != kOK || !HasLivePorts()) {
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#if !defined(PRODUCT)
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if (ShouldPauseOnExit(status)) {
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if (FLAG_trace_service_pause_events) {
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OS::PrintErr(
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"Isolate %s paused before exiting. "
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"Use the Observatory to release it.\n",
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name());
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}
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PausedOnExitLocked(&ml, true);
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// More messages may have come in while we released the monitor.
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status = HandleMessages(&ml, false, false);
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if (ShouldPauseOnExit(status)) {
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// Still paused.
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ASSERT(oob_queue_->IsEmpty());
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task_running_ = false; // No task in queue.
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return;
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} else {
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PausedOnExitLocked(&ml, false);
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}
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}
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#endif // !defined(PRODUCT)
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if (FLAG_trace_isolates) {
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if (status != kOK && thread() != NULL) {
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const Error& error = Error::Handle(thread()->sticky_error());
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OS::PrintErr(
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"[-] Stopping message handler (%s):\n"
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"\thandler: %s\n"
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"\terror: %s\n",
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MessageStatusString(status), name(), error.ToCString());
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} else {
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OS::PrintErr(
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"[-] Stopping message handler (%s):\n"
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"\thandler: %s\n",
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MessageStatusString(status), name());
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}
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}
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pool_ = NULL;
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// Decide if we have a callback before releasing the monitor.
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end_callback = end_callback_;
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callback_data = callback_data_;
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run_end_callback = end_callback_ != NULL;
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delete_me = delete_me_;
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}
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// Clear task_running_ last. This allows other tasks to potentially start
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// for this message handler.
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ASSERT(oob_queue_->IsEmpty());
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task_running_ = false;
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}
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// The handler may have been deleted by another thread here if it is a native
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// message handler.
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// Message handlers either use delete_me or end_callback but not both.
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ASSERT(!delete_me || !run_end_callback);
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if (run_end_callback) {
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ASSERT(end_callback != NULL);
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end_callback(callback_data);
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// The handler may have been deleted after this point.
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}
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if (delete_me) {
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delete this;
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}
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}
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void MessageHandler::ClosePort(Dart_Port port) {
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MonitorLocker ml(&monitor_);
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if (FLAG_trace_isolates) {
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OS::PrintErr(
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"[-] Closing port:\n"
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"\thandler: %s\n"
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"\tport: %" Pd64
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"\n"
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"\tports: live(%" Pd ")\n",
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name(), port, live_ports_);
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}
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}
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void MessageHandler::CloseAllPorts() {
|
|
MonitorLocker ml(&monitor_);
|
|
if (FLAG_trace_isolates) {
|
|
OS::PrintErr(
|
|
"[-] Closing all ports:\n"
|
|
"\thandler: %s\n",
|
|
name());
|
|
}
|
|
queue_->Clear();
|
|
oob_queue_->Clear();
|
|
}
|
|
|
|
void MessageHandler::RequestDeletion() {
|
|
ASSERT(OwnedByPortMap());
|
|
{
|
|
MonitorLocker ml(&monitor_);
|
|
if (task_running_) {
|
|
// This message handler currently has a task running on the thread pool.
|
|
delete_me_ = true;
|
|
return;
|
|
}
|
|
}
|
|
|
|
// This message handler has no current task. Delete it.
|
|
delete this;
|
|
}
|
|
|
|
void MessageHandler::increment_live_ports() {
|
|
MonitorLocker ml(&monitor_);
|
|
#if defined(DEBUG)
|
|
CheckAccess();
|
|
#endif
|
|
live_ports_++;
|
|
}
|
|
|
|
void MessageHandler::decrement_live_ports() {
|
|
MonitorLocker ml(&monitor_);
|
|
#if defined(DEBUG)
|
|
CheckAccess();
|
|
#endif
|
|
live_ports_--;
|
|
}
|
|
|
|
#if !defined(PRODUCT)
|
|
void MessageHandler::DebugDump() {
|
|
PortMap::DebugDumpForMessageHandler(this);
|
|
}
|
|
|
|
void MessageHandler::PausedOnStart(bool paused) {
|
|
MonitorLocker ml(&monitor_);
|
|
PausedOnStartLocked(&ml, paused);
|
|
}
|
|
|
|
void MessageHandler::PausedOnStartLocked(MonitorLocker* ml, bool paused) {
|
|
if (paused) {
|
|
ASSERT(!is_paused_on_start_);
|
|
ASSERT(paused_timestamp_ == -1);
|
|
paused_timestamp_ = OS::GetCurrentTimeMillis();
|
|
// Temporarily release the monitor when calling out to
|
|
// NotifyPauseOnStart. This avoids a dead lock that can occur
|
|
// when this message handler tries to post a message while a
|
|
// message is being posted to it.
|
|
ml->Exit();
|
|
NotifyPauseOnStart();
|
|
ml->Enter();
|
|
is_paused_on_start_ = true;
|
|
} else {
|
|
ASSERT(is_paused_on_start_);
|
|
ASSERT(paused_timestamp_ != -1);
|
|
paused_timestamp_ = -1;
|
|
// Resumed. Clear the resume request of the owning isolate.
|
|
Isolate* owning_isolate = isolate();
|
|
if (owning_isolate != NULL) {
|
|
owning_isolate->GetAndClearResumeRequest();
|
|
}
|
|
is_paused_on_start_ = false;
|
|
}
|
|
}
|
|
|
|
void MessageHandler::PausedOnExit(bool paused) {
|
|
MonitorLocker ml(&monitor_);
|
|
PausedOnExitLocked(&ml, paused);
|
|
}
|
|
|
|
void MessageHandler::PausedOnExitLocked(MonitorLocker* ml, bool paused) {
|
|
if (paused) {
|
|
ASSERT(!is_paused_on_exit_);
|
|
ASSERT(paused_timestamp_ == -1);
|
|
paused_timestamp_ = OS::GetCurrentTimeMillis();
|
|
// Temporarily release the monitor when calling out to
|
|
// NotifyPauseOnExit. This avoids a dead lock that can
|
|
// occur when this message handler tries to post a message
|
|
// while a message is being posted to it.
|
|
ml->Exit();
|
|
NotifyPauseOnExit();
|
|
ml->Enter();
|
|
is_paused_on_exit_ = true;
|
|
} else {
|
|
ASSERT(is_paused_on_exit_);
|
|
ASSERT(paused_timestamp_ != -1);
|
|
paused_timestamp_ = -1;
|
|
// Resumed. Clear the resume request of the owning isolate.
|
|
Isolate* owning_isolate = isolate();
|
|
if (owning_isolate != NULL) {
|
|
owning_isolate->GetAndClearResumeRequest();
|
|
}
|
|
is_paused_on_exit_ = false;
|
|
}
|
|
}
|
|
#endif // !defined(PRODUCT)
|
|
|
|
MessageHandler::AcquiredQueues::AcquiredQueues(MessageHandler* handler)
|
|
: handler_(handler), ml_(&handler->monitor_) {
|
|
ASSERT(handler != NULL);
|
|
handler_->oob_message_handling_allowed_ = false;
|
|
}
|
|
|
|
MessageHandler::AcquiredQueues::~AcquiredQueues() {
|
|
ASSERT(handler_ != NULL);
|
|
handler_->oob_message_handling_allowed_ = true;
|
|
}
|
|
|
|
} // namespace dart
|