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// 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
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