gplib/include/gp/vfs/process_data.hpp

#pragma once

#include "gp_config.hpp"
#include "gp/function.hpp"
#include "gp/indexed_array.hpp"
#include "gp/pointers.hpp"
#include "gp/vfs/file_description.hpp"
#include "gp/vfs/platforms/platform_autopicker.hpp"

#include <atomic>

namespace gp {

	enum class process_status {
		inactive = 0,
		running = 1,
		waiting = 2,
		finished = 3,
		zombie = 4
	};

	using pid_t = size_t;

	struct base_process_info {
		virtual void initialize() {}
		virtual void checkpoint() {}
		virtual void restore() {}
		virtual void switch_in() {}
		virtual void switch_out() {}
		virtual void cleanup() {}
		virtual ~base_process_info() {}
	};

	struct process_data{
		pid_t pid;
		gp::function<void()> fn;
		void* stack;
		size_t stack_sz;
		gp::process_status state;
		std::atomic_bool is_running;
		[[no_unique_address]] gp::specifics::platform_data specifics;
		gp::unique_ptr<base_process_info> info;

		process_data(gp::function<void()> _fn, void* _stack, size_t _stack_sz, gp::unique_ptr<base_process_info>&& _info) 
		: fn(_fn)
		, stack(_stack)
		, stack_sz(_stack_sz)
		, state(gp::process_status::inactive)
		, specifics(gp::buffer<char>{(char*)stack, stack_sz})
		, info(_info)
		{}

		process_data(process_data&& v)
		: fn(v.fn)
		, stack(v.stack)
		, stack_sz(v.stack_sz)
		, state(v.state)
		, specifics(v.specifics)
		, info(gp::move(v.info))
		{}

		~process_data() {
			if(info) {
				info->cleanup();
			}
		}
	};

}