id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
9654	try_join_for(0) returns false when thread has exited	ernest.galbrun@…	Anthony Williams	"I use try_join_for(boost::chrono::milliseconds(0)) to check if my thread has finished.

When upgrading from boost 53 to boost 55 I noticed that it now returns false systematically. It seems to work fine if I use any duration other than 0.

Here is a minimal code that reproduces the problem, I work with visual studio 2012 x64:


{{{
#include <boost\thread.hpp>
#include <iostream>

void my_func(void){
	std::cout<<""This shouldn't take long...\n"";
}

void main(void) {
	boost::thread * t = new boost::thread(my_func);
	int i = 0;
	while (! t->try_join_for(boost::chrono::milliseconds(1))) {
		std::cout<<""iteration ""<<++i<<'\n';
		boost::this_thread::sleep_for(boost::chrono::milliseconds(100));
	}
	std::cout << ""first task finished\n"";
	delete t;
	t = new boost::thread(my_func);
	i=0;
	while (! t->try_join_for(boost::chrono::milliseconds(0))) {
		std::cout<<""iteration ""<<++i<<'\n';
		boost::this_thread::sleep_for(boost::chrono::milliseconds(100));
	}	
	std::cout << ""second task finished\n"";
}
}}}

"	Bugs	closed		thread	Boost 1.55.0	Regression	duplicate