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// Copyright 2020 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 "include/cppgc/default-platform.h"
#include <chrono> // NOLINT(build/c++11)
#include <thread> // NOLINT(build/c++11)
#include "src/base/logging.h"
#include "src/base/page-allocator.h"
#include "src/base/sys-info.h"
#include "src/heap/cppgc/default-job.h"
namespace cppgc {
namespace internal {
// Default implementation of Jobs based on std::thread.
namespace {
class DefaultJobThread final : private std::thread {
public:
template <typename Function>
explicit DefaultJobThread(Function function)
: std::thread(std::move(function)) {}
~DefaultJobThread() { DCHECK(!joinable()); }
void Join() { join(); }
static size_t GetMaxSupportedConcurrency() {
return v8::base::SysInfo::NumberOfProcessors() - 1;
}
};
} // namespace
class DefaultJob final : public DefaultJobImpl<DefaultJobThread> {
public:
DefaultJob(Key key, std::unique_ptr<cppgc::JobTask> job_task)
: DefaultJobImpl(key, std::move(job_task)) {}
std::shared_ptr<DefaultJobThread> CreateThread(DefaultJobImpl* job) final {
return std::make_shared<DefaultJobThread>([job = this] {
DCHECK_NOT_NULL(job);
job->RunJobTask();
});
}
};
} // namespace internal
void DefaultTaskRunner::PostTask(std::unique_ptr<cppgc::Task> task) {
tasks_.push_back(std::move(task));
}
void DefaultTaskRunner::PostDelayedTask(std::unique_ptr<cppgc::Task> task,
double) {
PostTask(std::move(task));
}
void DefaultTaskRunner::PostNonNestableTask(std::unique_ptr<cppgc::Task>) {
UNREACHABLE();
}
void DefaultTaskRunner::PostNonNestableDelayedTask(std::unique_ptr<cppgc::Task>,
double) {
UNREACHABLE();
}
void DefaultTaskRunner::PostIdleTask(std::unique_ptr<cppgc::IdleTask> task) {
idle_tasks_.push_back(std::move(task));
}
bool DefaultTaskRunner::RunSingleTask() {
if (!tasks_.size()) return false;
tasks_.back()->Run();
tasks_.pop_back();
return true;
}
bool DefaultTaskRunner::RunSingleIdleTask(double deadline_in_seconds) {
if (!idle_tasks_.size()) return false;
idle_tasks_.back()->Run(deadline_in_seconds);
idle_tasks_.pop_back();
return true;
}
void DefaultTaskRunner::RunUntilIdle() {
for (auto& task : tasks_) {
task->Run();
}
tasks_.clear();
for (auto& task : idle_tasks_) {
task->Run(std::numeric_limits<double>::infinity());
}
idle_tasks_.clear();
}
DefaultPlatform::DefaultPlatform()
: page_allocator_(std::make_unique<v8::base::PageAllocator>()),
foreground_task_runner_(std::make_shared<DefaultTaskRunner>()) {}
DefaultPlatform::~DefaultPlatform() noexcept { WaitAllBackgroundTasks(); }
cppgc::PageAllocator* DefaultPlatform::GetPageAllocator() {
return page_allocator_.get();
}
double DefaultPlatform::MonotonicallyIncreasingTime() {
return std::chrono::duration<double>(
std::chrono::high_resolution_clock::now().time_since_epoch())
.count();
}
std::shared_ptr<cppgc::TaskRunner> DefaultPlatform::GetForegroundTaskRunner() {
return foreground_task_runner_;
}
std::unique_ptr<cppgc::JobHandle> DefaultPlatform::PostJob(
cppgc::TaskPriority priority, std::unique_ptr<cppgc::JobTask> job_task) {
std::shared_ptr<internal::DefaultJob> job =
internal::DefaultJobFactory<internal::DefaultJob>::Create(
std::move(job_task));
jobs_.push_back(job);
return std::make_unique<internal::DefaultJob::JobHandle>(std::move(job));
}
void DefaultPlatform::WaitAllForegroundTasks() {
foreground_task_runner_->RunUntilIdle();
}
void DefaultPlatform::WaitAllBackgroundTasks() {
for (auto& job : jobs_) {
job->Join();
}
jobs_.clear();
}
} // namespace cppgc
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