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overflow fix in timer on windows

This commit is contained in:
Arvid Norberg 2007-04-26 21:33:07 +00:00
parent db657af26d
commit 99dc46bd29
1 changed files with 13 additions and 2 deletions
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15
include/libtorrent/time.hpp
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@ -254,7 +254,12 @@ namespace libtorrent
if (performace_counter_frequency.QuadPart == 0)
QueryPerformanceFrequency(&performace_counter_frequency);
return pc * 1000000 / performace_counter_frequency.QuadPart;
#ifndef NDEBUG
// make sure we don't overflow
boost::int64_t ret = (pc * 1000 / performace_counter_frequency.QuadPart) * 1000;
assert((pc >= 0 && pc >= ret) || (pc < 0 && pc < ret));
#endif
return (pc * 1000 / performace_counter_frequency.QuadPart) * 1000;
}
inline boost::int64_t microseconds_to_performance_counter(boost::int64_t ms)
@ -262,7 +267,13 @@ namespace libtorrent
static LARGE_INTEGER performace_counter_frequency = {0,0};
if (performace_counter_frequency.QuadPart == 0)
QueryPerformanceFrequency(&performace_counter_frequency);
return ms * performace_counter_frequency.QuadPart / 1000000;
#ifndef NDEBUG
// make sure we don't overflow
boost::int64_t ret = (ms / 1000) * performace_counter_frequency.QuadPart / 1000;
assert((ms >= 0 && ms <= ret)
|| (ms < 0 && ms > ret));
#endif
return (ms / 1000) * performace_counter_frequency.QuadPart / 1000;
}
}