//验证channel是否线程安全

#include <chrono>
#include <iostream>
#include <string>
#include <conio.h>
#include <thread>
#include <deque>
#include <mutex>

#include "librf.h"

using namespace resumef;

using namespace std::chrono;
static std::mutex cout_mutex;
std::atomic<intptr_t> gcounter = 0;

#define OUTPUT_DEBUG	0

future_t<> test_channel_consumer(const channel_t<std::string> & c, size_t cnt)
{
	for (size_t i = 0; i < cnt; ++i)
	{
		try
		{
			auto val = co_await c.read();
			++gcounter;
#if OUTPUT_DEBUG
			{
				scoped_lock<std::mutex> __lock(cout_mutex);
				std::cout << "R " << val << "@" << std::this_thread::get_id() << std::endl;
			}
#endif
		}
		catch (channel_exception e)
		{
			//MAX_CHANNEL_QUEUE=0,并且先读后写，会触发read_before_write异常
			scoped_lock<std::mutex> __lock(cout_mutex);
			std::cout << e.what() << std::endl;
		}

#if OUTPUT_DEBUG
		co_await sleep_for(50ms);
#endif
	}
}

future_t<> test_channel_producer(const channel_t<std::string> & c, size_t cnt)
{
	for (size_t i = 0; i < cnt; ++i)
	{
		co_await c.write(std::to_string(i));
#if OUTPUT_DEBUG
		{
			scoped_lock<std::mutex> __lock(cout_mutex);
			std::cout << "W " << i << "@" << std::this_thread::get_id() << std::endl;
		}
#endif
	}
}

const size_t N = 8;
const size_t BATCH = 1000000;
const size_t MAX_CHANNEL_QUEUE = N + 1;		//0, 1, 5, 10, -1

void resumable_main_channel_mult_thread()
{
	channel_t<std::string> c(MAX_CHANNEL_QUEUE);

	std::thread write_th([&]
	{
		local_scheduler my_scheduler;		//2017/12/14日，仍然存在BUG。真多线程下调度，存在有协程无法被调度完成的BUG
		go test_channel_producer(c, BATCH * N);
#if RESUMEF_ENABLE_MULT_SCHEDULER
		this_scheduler()->run_until_notask();
#endif
		std::cout << "Write OK\r\n";
	});

	//std::this_thread::sleep_for(100ms);

	std::thread read_th[N];
	for (size_t i = 0; i < N; ++i)
	{
		read_th[i] = std::thread([&]
		{
			local_scheduler my_scheduler;		//2017/12/14日，仍然存在BUG。真多线程下调度，存在有协程无法被调度完成的BUG
			go test_channel_consumer(c, BATCH);
#if RESUMEF_ENABLE_MULT_SCHEDULER
			this_scheduler()->run_until_notask();
#endif
			std::cout << "Read OK\r\n";
		});
	}
	
#if !RESUMEF_ENABLE_MULT_SCHEDULER
	std::this_thread::sleep_for(100ms);
	scheduler_t::g_scheduler.run_until_notask();
#endif
	for(auto & th : read_th)
		th.join();
	write_th.join();

	std::cout << "OK: counter = " << gcounter.load() << std::endl;
	(void)_getch();
}
