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Copy pathruntime.hpp
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513 lines (442 loc) · 13 KB
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#ifndef CMCPP_RUNTIME_HPP
#define CMCPP_RUNTIME_HPP
#include <algorithm>
#include <any>
#include <array>
#include <atomic>
#include <cstdint>
#include <deque>
#include <functional>
#include <memory>
#include <mutex>
#include <optional>
#include <utility>
#include <vector>
namespace cmcpp
{
class Store;
struct ComponentInstance;
class ContextLocalStorage
{
public:
// Number of int32_t "slots" available for context-local data.
//
// Slot 0: reserved for cmcpp runtime/internal bookkeeping associated
// with the current execution context.
// Slot 1: additional per-context storage, intended for extensibility
// (e.g., user-defined or future runtime data).
static constexpr uint32_t LENGTH = 2;
ContextLocalStorage() = default;
void set(uint32_t index, int32_t value)
{
storage_[index] = value;
}
int32_t get(uint32_t index) const
{
return storage_[index];
}
private:
std::array<int32_t, LENGTH> storage_{};
};
struct Supertask;
using SupertaskPtr = std::shared_ptr<Supertask>;
using OnStart = std::function<std::vector<std::any>()>;
using OnResolve = std::function<void(std::optional<std::vector<std::any>>)>;
class Thread : public std::enable_shared_from_this<Thread>
{
public:
using ReadyFn = std::function<bool()>;
using ResumeFn = std::function<bool(bool)>;
using CancelFn = std::function<void()>;
static std::shared_ptr<Thread> create(Store &store, ReadyFn ready, ResumeFn resume, bool cancellable = false, CancelFn on_cancel = {});
static std::shared_ptr<Thread> create_suspended(Store &store, ResumeFn resume, bool cancellable = false, CancelFn on_cancel = {});
Thread(Store &store, ReadyFn ready, ResumeFn resume, bool cancellable, CancelFn on_cancel);
bool ready() const;
void resume();
void request_cancellation();
bool cancellable() const;
bool cancelled() const;
bool completed() const;
void set_index(uint32_t index);
std::optional<uint32_t> index() const;
bool suspended() const;
void resume_later();
bool suspend_until(ReadyFn ready, bool cancellable, bool force_yield = false);
void set_ready(ReadyFn ready);
void set_allow_cancellation(bool allow);
bool allow_cancellation() const;
void set_in_event_loop(bool value);
bool in_event_loop() const;
ContextLocalStorage &context()
{
return context_;
}
const ContextLocalStorage &context() const
{
return context_;
}
private:
enum class State
{
Suspended,
Pending,
Running,
Completed
};
void set_pending(bool pending_again, const std::shared_ptr<Thread> &self);
Store *store_;
ReadyFn ready_;
ResumeFn resume_;
CancelFn on_cancel_;
bool allow_cancellation_;
bool cancellable_;
bool cancelled_;
bool in_event_loop_;
ContextLocalStorage context_{};
std::optional<uint32_t> index_;
mutable std::mutex mutex_;
State state_;
std::atomic<bool> reschedule_requested_{false};
};
class Call
{
public:
using CancelRequest = std::function<void()>;
Call() = default;
explicit Call(CancelRequest cancel_req, bool cancellable = true)
: request_cancellation_(std::move(cancel_req)), cancellable_(cancellable) {}
void request_cancellation() const
{
if (!cancellable_)
{
return;
}
if (request_cancellation_)
{
request_cancellation_();
}
}
bool cancellable() const
{
return cancellable_;
}
static Call from_thread(const std::shared_ptr<Thread> &thread);
private:
CancelRequest request_cancellation_;
bool cancellable_ = false;
};
struct Supertask
{
SupertaskPtr parent;
std::weak_ptr<Thread> thread;
ComponentInstance *instance = nullptr;
};
using FuncInst = std::function<Call(Store &, SupertaskPtr, OnStart, OnResolve)>;
class Store
{
public:
Call invoke(const FuncInst &func, SupertaskPtr caller, OnStart on_start, OnResolve on_resolve);
void tick();
void schedule(const std::shared_ptr<Thread> &thread);
std::size_t pending_size() const;
void enqueue(std::function<void()> microtask);
private:
friend class Thread;
mutable std::mutex mutex_;
std::vector<std::shared_ptr<Thread>> pending_;
std::deque<std::function<void()>> microtasks_;
};
inline std::shared_ptr<Thread> Thread::create(Store &store, ReadyFn ready, ResumeFn resume, bool cancellable, CancelFn on_cancel)
{
auto thread = std::shared_ptr<Thread>(new Thread(store, std::move(ready), std::move(resume), cancellable, std::move(on_cancel)));
store.schedule(thread);
return thread;
}
inline std::shared_ptr<Thread> Thread::create_suspended(Store &store, ResumeFn resume, bool cancellable, CancelFn on_cancel)
{
auto thread = std::shared_ptr<Thread>(new Thread(store, nullptr, std::move(resume), cancellable, std::move(on_cancel)));
{
std::lock_guard lock(thread->mutex_);
thread->state_ = State::Suspended;
}
return thread;
}
inline Thread::Thread(Store &store, ReadyFn ready, ResumeFn resume, bool cancellable, CancelFn on_cancel)
: store_(&store),
ready_(std::move(ready)),
resume_(std::move(resume)),
on_cancel_(std::move(on_cancel)),
allow_cancellation_(cancellable),
cancellable_(cancellable),
cancelled_(false),
in_event_loop_(false),
state_(State::Pending)
{
}
inline bool Thread::ready() const
{
std::lock_guard lock(mutex_);
if (state_ != State::Pending)
{
return false;
}
if (cancelled_ && cancellable_)
{
return true;
}
if (!ready_)
{
return true;
}
return ready_();
}
inline void Thread::resume()
{
auto self = shared_from_this();
ResumeFn resume;
bool was_cancelled = false;
{
std::lock_guard lock(mutex_);
if (state_ != State::Pending && state_ != State::Suspended)
{
return;
}
state_ = State::Running;
resume = resume_;
was_cancelled = cancelled_;
cancelled_ = false;
}
bool keep_pending = false;
if (resume)
{
keep_pending = resume(was_cancelled);
}
bool requested = reschedule_requested_.exchange(false, std::memory_order_relaxed);
set_pending(keep_pending || requested, self);
}
inline void Thread::request_cancellation()
{
CancelFn cancel;
{
std::lock_guard lock(mutex_);
if (!allow_cancellation_ || cancelled_)
{
return;
}
cancelled_ = true;
cancel = on_cancel_;
}
if (cancel)
{
cancel();
}
}
inline bool Thread::cancellable() const
{
std::lock_guard lock(mutex_);
return cancellable_;
}
inline bool Thread::cancelled() const
{
std::lock_guard lock(mutex_);
return cancelled_;
}
inline bool Thread::completed() const
{
std::lock_guard lock(mutex_);
return state_ == State::Completed;
}
inline void Thread::set_index(uint32_t index)
{
std::lock_guard lock(mutex_);
index_ = index;
}
inline std::optional<uint32_t> Thread::index() const
{
std::lock_guard lock(mutex_);
return index_;
}
inline bool Thread::suspended() const
{
std::lock_guard lock(mutex_);
return state_ == State::Suspended;
}
inline void Thread::resume_later()
{
auto self = shared_from_this();
{
std::lock_guard lock(mutex_);
if (state_ != State::Suspended)
{
return;
}
ready_ = []()
{
return true;
};
cancellable_ = false;
cancelled_ = false;
state_ = State::Pending;
}
store_->schedule(self);
}
inline bool Thread::suspend_until(ReadyFn ready, bool cancellable, bool force_yield)
{
bool ready_now = false;
if (ready && !force_yield)
{
ready_now = ready();
}
if (ready_now)
{
return true;
}
auto gate = std::make_shared<std::atomic<bool>>(false);
ReadyFn wrapped = [ready = std::move(ready), gate, force_yield]() mutable -> bool
{
if (force_yield && !gate->exchange(true, std::memory_order_relaxed))
{
return false;
}
if (!ready)
{
return true;
}
return ready();
};
{
std::lock_guard lock(mutex_);
ready_ = std::move(wrapped);
cancellable_ = allow_cancellation_ && cancellable;
}
reschedule_requested_.store(true, std::memory_order_relaxed);
return false;
}
inline void Thread::set_ready(ReadyFn ready)
{
std::lock_guard lock(mutex_);
ready_ = std::move(ready);
}
inline void Thread::set_allow_cancellation(bool allow)
{
std::lock_guard lock(mutex_);
allow_cancellation_ = allow;
if (!allow)
{
cancellable_ = false;
}
}
inline bool Thread::allow_cancellation() const
{
std::lock_guard lock(mutex_);
return allow_cancellation_;
}
inline void Thread::set_in_event_loop(bool value)
{
std::lock_guard lock(mutex_);
in_event_loop_ = value;
}
inline bool Thread::in_event_loop() const
{
std::lock_guard lock(mutex_);
return in_event_loop_;
}
inline void Thread::set_pending(bool pending_again, const std::shared_ptr<Thread> &self)
{
{
std::lock_guard lock(mutex_);
state_ = pending_again ? State::Pending : State::Completed;
if (!pending_again)
{
ready_ = nullptr;
cancellable_ = false;
}
}
if (pending_again)
{
store_->schedule(self);
}
}
inline Call Call::from_thread(const std::shared_ptr<Thread> &thread)
{
if (!thread)
{
return Call();
}
std::weak_ptr<Thread> weak = thread;
return Call(
[weak]()
{
if (auto locked = weak.lock())
{
locked->request_cancellation();
}
},
thread->allow_cancellation());
}
inline Call Store::invoke(const FuncInst &func, SupertaskPtr caller, OnStart on_start, OnResolve on_resolve)
{
if (!func)
{
return Call();
}
return func(*this, std::move(caller), std::move(on_start), std::move(on_resolve));
}
inline void Store::tick()
{
std::function<void()> microtask;
std::shared_ptr<Thread> selected;
{
std::lock_guard lock(mutex_);
if (!microtasks_.empty())
{
microtask = std::move(microtasks_.front());
microtasks_.pop_front();
}
else
{
auto it = std::find_if(pending_.begin(), pending_.end(), [](const std::shared_ptr<Thread> &thread)
{ return thread && thread->ready(); });
if (it == pending_.end())
{
return;
}
selected = *it;
pending_.erase(it);
}
}
if (microtask)
{
microtask();
return;
}
if (selected)
{
selected->resume();
}
}
inline void Store::schedule(const std::shared_ptr<Thread> &thread)
{
if (!thread)
{
return;
}
std::lock_guard lock(mutex_);
pending_.push_back(thread);
}
inline std::size_t Store::pending_size() const
{
std::lock_guard lock(mutex_);
return pending_.size();
}
inline void Store::enqueue(std::function<void()> microtask)
{
if (!microtask)
{
return;
}
std::lock_guard lock(mutex_);
microtasks_.push_back(std::move(microtask));
}
}
#endif