suthread.cpp

// Copyright (c) 2016 Suneido Software Corp. All rights reserved
// Licensed under GPLv2

#include "value.h"
#include "fibers.h"
#include "errlog.h"
#include "exceptimp.h"
#include "suobject.h"
#include "interp.h"
// ReSharper disable once CppUnusedIncludeDirective
#include "dbms.h"
#include "alert.h"
#include "sublock.h"
#include "builtinclass.h"
#include <span>

#pragma warning(disable : 4722) // destructor never returns
struct ThreadCloser {
	ThreadCloser() { // to avoid gcc unused warning
	}
	~ThreadCloser() {
		delete tls().thedbms;
		tls().thedbms = nullptr;

		Fibers::end();
	}
};

struct ThreadInfo {
	ThreadInfo(Value f) : fn(f) {
	}
	Value fn;
};

// this is a wrapper that runs inside the fiber to catch exceptions
static void _stdcall thread(void* arg) {
	Proc p;
	tls().proc = &p;

	ThreadCloser closer;
	try {
		ThreadInfo* ti = static_cast<ThreadInfo*>(arg);
		ti->fn.call(ti->fn, CALL);
	} catch (const Except& e) {
		errlog("ERROR uncaught in thread:", e.str(), e.callstack());
	}
}

class SuThread : public SuValue {
public:
	static auto methods() {
		return std::span<Method<SuThread>>(); // none
	}

	static Value Count(BuiltinArgs&);
	static Value List(BuiltinArgs&);
	static Value Name(BuiltinArgs&);
	static Value Sleep(BuiltinArgs&);
};

template <>
Value BuiltinClass<SuThread>::instantiate(BuiltinArgs& args) {
	except("can't create instance of Thread");
}

template <>
Value BuiltinClass<SuThread>::callclass(BuiltinArgs& args) {
	args.usage("Thread(block)");
	Value func = args.getValue("block");
	args.end();
	Fibers::create(thread, new ThreadInfo(func));
	return Value();
}

template <>
auto BuiltinClass<SuThread>::static_methods() {
	static StaticMethod methods[]{{"Count", &SuThread::Count},
		{"List", &SuThread::List}, {"Name", &SuThread::Name},
		{"Sleep", &SuThread::Sleep}};
	return std::span(methods);
}

Value SuThread::Count(BuiltinArgs& args) {
	args.usage("Thread.Count()").end();
	return Fibers::size();
}

Value SuThread::List(BuiltinArgs& args) {
	args.usage("Thread.List()").end();
	SuObject* list = new SuObject();
	Fibers::foreach_fiber_info([list](gcstring name, const char* status) {
		list->putdata(new SuString(name), status);
	});
	return list;
}

Value SuThread::Name(BuiltinArgs& args) {
	args.usage("Thread.Name() or Thread.Name(string)");
	if (Value name = args.getValue("string", Value()))
		Fibers::set_name(name.gcstr());
	args.end();
	return new SuString(Fibers::get_name());
}

Value SuThread::Sleep(BuiltinArgs& args) {
	args.usage("Thread.Sleep(ms)");
	int ms = args.getint("ms");
	args.end();
	Fibers::sleep(ms);
	return Value();
}

Value su_Thread() {
	static BuiltinClass<SuThread> instance("(func)");
	return &instance;
}