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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.
#ifndef V8_LIBPLATFORM_DEFAULT_WORKER_THREADS_TASK_RUNNER_H_
#define V8_LIBPLATFORM_DEFAULT_WORKER_THREADS_TASK_RUNNER_H_
#include <memory>
#include <vector>
#include "include/libplatform/libplatform-export.h"
#include "include/v8-platform.h"
#include "src/base/platform/mutex.h"
#include "src/base/platform/platform.h"
#include "src/libplatform/delayed-task-queue.h"
namespace v8 {
namespace platform {
class V8_PLATFORM_EXPORT DefaultWorkerThreadsTaskRunner
: public NON_EXPORTED_BASE(TaskRunner) {
public:
using TimeFunction = double (*)();
DefaultWorkerThreadsTaskRunner(uint32_t thread_pool_size,
TimeFunction time_function);
~DefaultWorkerThreadsTaskRunner() override;
void Terminate();
double MonotonicallyIncreasingTime();
// It is only valid to call this method on a task runner with a single worker
// thread. True if the current thread is the worker thread.
bool RunsTasksOnCurrentThread() const;
// v8::TaskRunner implementation.
void PostTask(std::unique_ptr<Task> task) override;
void PostDelayedTask(std::unique_ptr<Task> task,
double delay_in_seconds) override;
void PostIdleTask(std::unique_ptr<IdleTask> task) override;
bool IdleTasksEnabled() override;
private:
class WorkerThread : public base::Thread {
public:
explicit WorkerThread(DefaultWorkerThreadsTaskRunner* runner);
~WorkerThread() override;
// This thread attempts to get tasks in a loop from |runner_| and run them.
void Run() override;
private:
DefaultWorkerThreadsTaskRunner* runner_;
DISALLOW_COPY_AND_ASSIGN(WorkerThread);
};
// Called by the WorkerThread. Gets the next take (delayed or immediate) to be
// executed. Blocks if no task is available.
std::unique_ptr<Task> GetNext();
bool terminated_ = false;
base::Mutex lock_;
DelayedTaskQueue queue_;
std::vector<std::unique_ptr<WorkerThread>> thread_pool_;
TimeFunction time_function_;
std::atomic_int single_worker_thread_id_{0};
uint32_t thread_pool_size_;
};
} // namespace platform
} // namespace v8
#endif // V8_LIBPLATFORM_DEFAULT_WORKER_THREADS_TASK_RUNNER_H_
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