#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>
#include <boost/thread.hpp>
#include <iostream>
#include <string>

struct read_t
{
	read_t(const std::string &_js) : js(_js)
	{
	}

	void operator()() const
	{
		std::istringstream ijs;
		while (true)
		{
			ijs.str(js);
			boost::property_tree::ptree pt;
			boost::property_tree::read_json(ijs, pt);
			std::cout << "." << std::flush;
		}
	}

	const std::string js;
};


int main()
{
	const std::string js = "\
		{\
		   \"glossary\":{\
			  \"title\":\"example glossary\",\
			  \"GlossDiv\":{\
				 \"title\":\"S\",\
				 \"GlossList\":{\
					\"GlossEntry\":{\
					   \"ID\":\"SGML\",\
					   \"SortAs\":\"SGML\",\
					   \"GlossTerm\":\"Standard Generalized Markup Language\",\
					   \"Acronym\":\"SGML\",\
					   \"Abbrev\":\"ISO 8879:1986\",\
					   \"GlossDef\":{\
						  \"para\":\"A meta-markup language.\",\
						  \"GlossSeeAlso\":[\
							 \"GML\",\
							 \"XML\"\
						  ]\
					   },\
					   \"GlossSee\":\"markup\"\
					}\
				 }\
			  }\
		   }\
		}\
	";

	boost::thread t1((read_t(js)));
	boost::thread t2((read_t(js))); // comment out this line and the program runs fine
	t1.join(); // never stop
	return 0;
}