1 files changed, 59 insertions, 0 deletions
diff --git a/deps/v8/src/libplatform/default-background-task-runner.cc b/deps/v8/src/libplatform/default-background-task-runner.cc
new file mode 100644
index 0000000000..b556b6c3fe
--- /dev/null
+++ b/deps/v8/src/libplatform/default-background-task-runner.cc
@@ -0,0 +1,59 @@
+// Copyright 2017 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.
+
+#include "src/libplatform/default-background-task-runner.h"
+
+#include "src/base/platform/mutex.h"
+#include "src/libplatform/worker-thread.h"
+
+namespace v8 {
+namespace platform {
+
+DefaultBackgroundTaskRunner::DefaultBackgroundTaskRunner(
+    uint32_t thread_pool_size) {
+  for (uint32_t i = 0; i < thread_pool_size; ++i) {
+    thread_pool_.push_back(base::make_unique<WorkerThread>(&queue_));
+  }
+}
+
+DefaultBackgroundTaskRunner::~DefaultBackgroundTaskRunner() {
+  // This destructor is needed because we have unique_ptr to the WorkerThreads,
+  // und the {WorkerThread} class is forward declared in the header file.
+}
+
+void DefaultBackgroundTaskRunner::Terminate() {
+  base::LockGuard<base::Mutex> guard(&lock_);
+  terminated_ = true;
+  queue_.Terminate();
+  // Clearing the thread pool lets all worker threads join.
+  thread_pool_.clear();
+}
+
+void DefaultBackgroundTaskRunner::PostTask(std::unique_ptr<Task> task) {
+  base::LockGuard<base::Mutex> guard(&lock_);
+  if (terminated_) return;
+  queue_.Append(std::move(task));
+}
+
+void DefaultBackgroundTaskRunner::PostDelayedTask(std::unique_ptr<Task> task,
+                                                  double delay_in_seconds) {
+  base::LockGuard<base::Mutex> guard(&lock_);
+  if (terminated_) return;
+  // There is no use case for this function on a background thread at the
+  // moment, but it is still part of the interface.
+  UNIMPLEMENTED();
+}
+
+void DefaultBackgroundTaskRunner::PostIdleTask(std::unique_ptr<IdleTask> task) {
+  // There are no idle background tasks.
+  UNREACHABLE();
+}
+
+bool DefaultBackgroundTaskRunner::IdleTasksEnabled() {
+  // There are no idle background tasks.
+  return false;
+}
+
+}  // namespace platform
+}  // namespace v8