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QueryPerformanceXXX does not fail after WindowsXP, simplify code.

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This commit is contained in:
Ion Gaztañaga
2023-01-20 12:41:56 +01:00
parent 99294523dc
commit 2513f1bdcd
1 changed files with 6 additions and 14 deletions
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20
include/boost/move/detail/nsec_clock.hpp
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@ -103,10 +103,9 @@ struct QPFHolder
static inline double get_nsec_per_tic()
{
long long freq;
int r = boost::move_detail::QueryPerformanceFrequency( &freq );
boost::movelib::ignore(r);
assert(r != 0 && "Boost::Move - get_nanosecs_per_tic Internal Error");
//According to MS documentation:
//"On systems that run Windows XP or later, the function will always succeed and will thus never return zero"
(void)boost::move_detail::QueryPerformanceFrequency(&freq);
return double(1000000000.0L / double(freq));
}
@ -121,16 +120,9 @@ inline boost::uint64_t nsec_clock() BOOST_NOEXCEPT
double nanosecs_per_tic = QPFHolder<0>::nanosecs_per_tic;
long long pcount;
unsigned times=0;
while ( !boost::move_detail::QueryPerformanceCounter( &pcount ) )
{
if ( ++times > 3 )
{
assert("Boost::Move - QueryPerformanceCounter Internal Error");
return 0u;
}
}
//According to MS documentation:
//"On systems that run Windows XP or later, the function will always succeed and will thus never return zero"
(void)boost::move_detail::QueryPerformanceCounter( &pcount );
return static_cast<boost::uint64_t>(nanosecs_per_tic * double(pcount));
}