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Merge pull request #4346 from Cyan4973/wintime

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fix a risk of overflow on a time counter on Windows
This commit is contained in:
Yann Collet
2025-03-27 21:07:57 -07:00
committed by GitHub
parent 23e8812f5b 33f4d40d1e
commit 7f0519dcfd
1 changed files with 3 additions and 1 deletions
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4
programs/timefn.c
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@ -28,18 +28,20 @@
UTIL_time_t UTIL_getTime(void) UTIL_time_t UTIL_getTime(void)
{ {
static LARGE_INTEGER ticksPerSecond; static LARGE_INTEGER ticksPerSecond;
static double nsFactor = 1.0;
static int init = 0; static int init = 0;
if (!init) { if (!init) {
if (!QueryPerformanceFrequency(&ticksPerSecond)) { if (!QueryPerformanceFrequency(&ticksPerSecond)) {
perror("timefn::QueryPerformanceFrequency"); perror("timefn::QueryPerformanceFrequency");
abort(); abort();
} }
nsFactor = 1000000000.0 / (double)ticksPerSecond.QuadPart;
init = 1; init = 1;
} }
{ UTIL_time_t r; { UTIL_time_t r;
LARGE_INTEGER x; LARGE_INTEGER x;
QueryPerformanceCounter(&x); QueryPerformanceCounter(&x);
r.t = (PTime)(x.QuadPart * 1000000000ULL / ticksPerSecond.QuadPart); r.t = (PTime)((double)x.QuadPart * nsFactor);
return r; return r;
} }
} }