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#include "NativeScriptPlatform.h"
using namespace v8;
namespace tns {
NativeScriptPlatform* NativeScriptPlatform::instance_ = nullptr;
namespace {
/**
* The v8::TaskRunner handed to v8 for one isolate. Stateless beyond the
* isolate pointer: every post resolves the current EventLoop through the
* platform registry, so a stale loop replaced by RefreshEventLoop is
* redirected transparently, and posts for a disposed isolate (registry entry
* gone) drop instead of reviving a dead pointer's entry.
*/
class V8TaskRunnerAdapter : public v8::TaskRunner {
public:
explicit V8TaskRunnerAdapter(Isolate* isolate) : isolate_(isolate) {}
bool IdleTasksEnabled() override { return false; }
bool NonNestableTasksEnabled() const override { return true; }
bool NonNestableDelayedTasksEnabled() const override { return true; }
protected:
void PostTaskImpl(std::unique_ptr<Task> task, const SourceLocation& location) override {
Post(std::move(task), true, 0);
}
void PostNonNestableTaskImpl(std::unique_ptr<Task> task,
const SourceLocation& location) override {
Post(std::move(task), false, 0);
}
void PostDelayedTaskImpl(std::unique_ptr<Task> task, double delay_in_seconds,
const SourceLocation& location) override {
Post(std::move(task), true, delay_in_seconds);
}
void PostNonNestableDelayedTaskImpl(std::unique_ptr<Task> task, double delay_in_seconds,
const SourceLocation& location) override {
Post(std::move(task), false, delay_in_seconds);
}
private:
void Post(std::unique_ptr<Task> task, bool nestable, double delaySeconds) {
auto loop = NativeScriptPlatform::Instance()->LookupEventLoop(isolate_);
if (loop != nullptr) {
loop->PostV8Task(std::move(task), nestable, delaySeconds);
}
}
Isolate* isolate_;
};
} // namespace
NativeScriptPlatform::NativeScriptPlatform(std::unique_ptr<Platform> defaultPlatform)
: default_(std::move(defaultPlatform)) {
instance_ = this;
}
NativeScriptPlatform::IsolateEntry& NativeScriptPlatform::GetEntryLocked(Isolate* isolate) {
auto it = loops_.find(isolate);
if (it != loops_.end()) {
return it->second;
}
auto emplaced =
loops_.emplace(isolate, IsolateEntry{std::make_shared<EventLoop>(isolate),
std::make_shared<V8TaskRunnerAdapter>(isolate)});
return emplaced.first->second;
}
std::shared_ptr<EventLoop> NativeScriptPlatform::GetEventLoop(Isolate* isolate) {
std::lock_guard<std::mutex> lock(loopsMutex_);
return GetEntryLocked(isolate).loop;
}
std::shared_ptr<EventLoop> NativeScriptPlatform::RefreshEventLoop(Isolate* isolate) {
std::lock_guard<std::mutex> lock(loopsMutex_);
auto& entry = GetEntryLocked(isolate);
if (entry.loop->IsStopped()) {
entry.loop = std::make_shared<EventLoop>(isolate);
}
return entry.loop;
}
std::shared_ptr<EventLoop> NativeScriptPlatform::LookupEventLoop(Isolate* isolate) {
std::lock_guard<std::mutex> lock(loopsMutex_);
auto it = loops_.find(isolate);
return it != loops_.end() ? it->second.loop : nullptr;
}
void NativeScriptPlatform::IsolateDisposed(Isolate* isolate,
const std::shared_ptr<EventLoop>& loop) {
std::lock_guard<std::mutex> lock(loopsMutex_);
auto it = loops_.find(isolate);
if (it != loops_.end() && it->second.loop == loop) {
loops_.erase(it);
}
}
PageAllocator* NativeScriptPlatform::GetPageAllocator() { return default_->GetPageAllocator(); }
ThreadIsolatedAllocator* NativeScriptPlatform::GetThreadIsolatedAllocator() {
return default_->GetThreadIsolatedAllocator();
}
size_t NativeScriptPlatform::GetZeroSegmentSize() { return default_->GetZeroSegmentSize(); }
void NativeScriptPlatform::OnCriticalMemoryPressure() { default_->OnCriticalMemoryPressure(); }
int NativeScriptPlatform::NumberOfWorkerThreads() { return default_->NumberOfWorkerThreads(); }
std::shared_ptr<TaskRunner> NativeScriptPlatform::GetForegroundTaskRunner(Isolate* isolate,
TaskPriority priority) {
// one runner regardless of priority: the home runloop's FIFO order is the
// priority model of the runtime thread
std::lock_guard<std::mutex> lock(loopsMutex_);
return GetEntryLocked(isolate).runner;
}
bool NativeScriptPlatform::IdleTasksEnabled(Isolate* isolate) { return false; }
std::unique_ptr<ScopedBoostablePriority> NativeScriptPlatform::CreateBoostablePriorityScope() {
return default_->CreateBoostablePriorityScope();
}
std::unique_ptr<ScopedBlockingCall> NativeScriptPlatform::CreateBlockingScope(
BlockingType blocking_type) {
return default_->CreateBlockingScope(blocking_type);
}
double NativeScriptPlatform::MonotonicallyIncreasingTime() {
return default_->MonotonicallyIncreasingTime();
}
int64_t NativeScriptPlatform::CurrentClockTimeMilliseconds() {
return default_->CurrentClockTimeMilliseconds();
}
double NativeScriptPlatform::CurrentClockTimeMillis() { return default_->CurrentClockTimeMillis(); }
double NativeScriptPlatform::CurrentClockTimeMillisecondsHighResolution() {
return default_->CurrentClockTimeMillisecondsHighResolution();
}
Platform::StackTracePrinter NativeScriptPlatform::GetStackTracePrinter() {
return default_->GetStackTracePrinter();
}
TracingController* NativeScriptPlatform::GetTracingController() {
return default_->GetTracingController();
}
void NativeScriptPlatform::DumpWithoutCrashing() { default_->DumpWithoutCrashing(); }
HighAllocationThroughputObserver* NativeScriptPlatform::GetHighAllocationThroughputObserver() {
return default_->GetHighAllocationThroughputObserver();
}
std::unique_ptr<JobHandle> NativeScriptPlatform::CreateJobImpl(TaskPriority priority,
std::unique_ptr<JobTask> job_task,
const SourceLocation& location) {
return default_->CreateJob(priority, std::move(job_task), location);
}
void NativeScriptPlatform::PostTaskOnWorkerThreadImpl(TaskPriority priority,
std::unique_ptr<Task> task,
const SourceLocation& location) {
default_->PostTaskOnWorkerThread(priority, std::move(task), location);
}
void NativeScriptPlatform::PostDelayedTaskOnWorkerThreadImpl(TaskPriority priority,
std::unique_ptr<Task> task,
double delay_in_seconds,
const SourceLocation& location) {
default_->PostDelayedTaskOnWorkerThread(priority, std::move(task), delay_in_seconds, location);
}
} // namespace tns
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