id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
6361	integer overflow in boost::chrono::process_real_cpu_clock::now() under Windows 32bits	ivan.lelann@…	viboes	"As of 1.48 Boost.Chrono contains code below for boost::chrono::process_real_cpu_clock::now()
(boost\chrono\detail\inlined\win\process_cpu_clocks.hpp)

    clock_t c = ::clock();
    /* ... */
    return time_point(
      duration(c*(1000000000l/CLOCKS_PER_SEC))
    );

duration::rep is int64/nanoseconds, clock_t is long. This is under VS2008, Win XP 32bits.
I think ""c"" should be cast to duration::rep before being multiplied.

C-style cast fixed the problem for me.
Howard Hinnant suggested following cleaner fix on the mailing list :

typedef ratio_divide<giga, ratio<CLOCKS_PER_SEC>>::type R;
return time_point(
  duration(static_cast<rep>(c)*R::num/R::den)
);

NB: This appears at least twice in this file. It also appears in ""mac"" and ""posix"" folders though I cannot say if it is problematic on this platforms."	Bugs	closed	Boost 1.50.0	chrono	Boost 1.48.0	Problem	fixed