Ivan Inozemtsev
51ea42537a
Also add a sample for calling Dart functions which return/accept futures. Change-Id: I932d0577709f4e068ccd3212797751ecb347c4f9 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/408281 Commit-Queue: Ivan Inozemtsev <iinozemtsev@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com>
80 lines
2.5 KiB
C++
80 lines
2.5 KiB
C++
// Copyright (c) 2025, 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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// Same as run_timer.cc, but uses std::async instead of a dedicated event loop
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// thread. Used as a demonstration of a custom message scheduler.
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#include <future>
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#include <iostream>
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#include <thread>
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#include "helpers.h"
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#include "include/dart_api.h"
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#include "include/dart_engine.h"
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// Calls `startTimer` from timer.dart
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void StartTimer(Dart_Isolate isolate, uint32_t millis) {
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WithIsolate<void>(isolate, [&]() {
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std::initializer_list<Dart_Handle> args{Dart_NewInteger(millis)};
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CheckError(
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Dart_Invoke(Dart_RootLibrary(), Dart_NewStringFromCString("startTimer"),
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1, const_cast<Dart_Handle*>(args.begin())),
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"calling startTimer");
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});
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}
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// Calls `stopTimer` from timer.dart
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void StopTimer(Dart_Isolate isolate) {
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WithIsolate<void>(isolate, [&]() {
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CheckError(Dart_Invoke(Dart_RootLibrary(),
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Dart_NewStringFromCString("stopTimer"), 0, nullptr),
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"calling stopTimer");
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});
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}
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// Gets `ticks` from timer.dart
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int64_t GetTicks(Dart_Isolate isolate) {
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return WithIsolate<int64_t>(isolate, []() {
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return IntFromHandle(
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Dart_GetField(Dart_RootLibrary(), Dart_NewStringFromCString("ticks")));
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});
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}
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std::mutex shutdown_mutex;
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void ScheduleDartMessage(Dart_Isolate isolate, void* context) {
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std::ignore = std::async(DartEngine_HandleMessage, isolate);
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}
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int main(int argc, char** argv) {
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if (argc == 1) {
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std::cerr << "Must specify snapshot path" << std::endl;
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std::exit(1);
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}
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char* error = nullptr;
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// Start an event loop on a separate thread and use it as a default
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// scheduler.
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DartEngine_MessageScheduler scheduler{ScheduleDartMessage, nullptr};
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DartEngine_SetDefaultMessageScheduler(scheduler);
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// Load snapshot and create an isolate
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DartEngine_SnapshotData snapshot_data = AutoSnapshotFromFile(argv[1], &error);
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CheckError(error, "reading snapshot");
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Dart_Isolate isolate = DartEngine_CreateIsolate(snapshot_data, &error);
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CheckError(error, "creating isolate");
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// Call Dart function to start a timer.
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StartTimer(isolate, 1);
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// Wait a bit.
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std::this_thread::sleep_for(std::chrono::milliseconds(100));
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// Stop the timer.
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StopTimer(isolate);
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// Get timer value.
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std::cout << "Ticks: " << GetTicks(isolate) << std::endl;
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DartEngine_Shutdown();
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}
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