platform_isolate.cc

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#include <iostream>
#include <thread>
 
#include "flutter/fml/macros.h"
#include "flutter/fml/task_runner.h"
#include "flutter/lib/ui/ui_dart_state.h"
#include "flutter/lib/ui/window/platform_isolate.h"
#include "third_party/tonic/converter/dart_converter.h"
 
namespace flutter {
 
void PlatformIsolateNativeApi::Spawn(Dart_Handle entry_point) {
  UIDartState* current_state = UIDartState::Current();
  FML_DCHECK(current_state != nullptr);
  if (!current_state->IsRootIsolate()) {
    // TODO(flutter/flutter#136314): Remove this restriction.
    Dart_EnterScope();
    Dart_ThrowException(tonic::ToDart(
        "PlatformIsolates can only be spawned on the root isolate."));
  }
 
  char* error = nullptr;
  current_state->CreatePlatformIsolate(entry_point, &error);
  if (error) {
    Dart_EnterScope();
    Dart_Handle error_handle = tonic::ToDart<const char*>(error);
    ::free(error);
    Dart_ThrowException(error_handle);
  }
}
 
bool PlatformIsolateNativeApi::IsRunningOnPlatformThread() {
  UIDartState* current_state = UIDartState::Current();
  FML_DCHECK(current_state != nullptr);
  fml::RefPtr<fml::TaskRunner> platform_task_runner =
      current_state->GetTaskRunners().GetPlatformTaskRunner();
  if (!platform_task_runner) {
    return false;
  }
  return platform_task_runner->RunsTasksOnCurrentThread();
}
 
}  // namespace flutter