[std/times]getTime now uses high resolution API on windows (#17901)

nim-lang · Jun 23, 2021 · 496bd79 · 496bd79
1 parent 63456c6
commit 496bd79
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Showing 2 changed files with 6 additions and 2 deletions.
diff --git a/lib/pure/times.nim b/lib/pure/times.nim
@@ -880,6 +880,7 @@ since((1, 1)):
   export fromUnixFloat
   export toUnixFloat
 
+
 proc fromWinTime*(win: int64): Time =
   ## Convert a Windows file time (100-nanosecond intervals since
   ## `1601-01-01T00:00:00Z`) to a `Time`.
@@ -912,7 +913,7 @@ proc getTime*(): Time {.tags: [TimeEffect], benign.} =
     result = initTime(ts.tv_sec.int64, ts.tv_nsec.int)
   elif defined(windows):
     var f {.noinit.}: FILETIME
-    getSystemTimeAsFileTime(f)
+    getSystemTimePreciseAsFileTime(f)
     result = fromWinTime(rdFileTime(f))
 
 proc `-`*(a, b: Time): Duration {.operator, extern: "ntDiffTime".} =
@@ -2595,7 +2596,7 @@ proc epochTime*(): float {.tags: [TimeEffect].} =
       toBiggestFloat(ts.tv_nsec.int64) / 1_000_000_000
   elif defined(windows):
     var f {.noinit.}: winlean.FILETIME
-    getSystemTimeAsFileTime(f)
+    getSystemTimePreciseAsFileTime(f)
     var i64 = rdFileTime(f) - epochDiff
     var secs = i64 div rateDiff
     var subsecs = i64 mod rateDiff

diff --git a/lib/windows/winlean.nim b/lib/windows/winlean.nim
@@ -928,6 +928,9 @@ proc getProcessTimes*(hProcess: Handle; lpCreationTime, lpExitTime,
   lpKernelTime, lpUserTime: var FILETIME): WINBOOL {.stdcall,
   dynlib: "kernel32", importc: "GetProcessTimes".}
 
+proc getSystemTimePreciseAsFileTime*(lpSystemTimeAsFileTime: var FILETIME) {.
+  importc: "GetSystemTimePreciseAsFileTime", dynlib: "kernel32", stdcall, sideEffect.}
+
 type inet_ntop_proc = proc(family: cint, paddr: pointer, pStringBuffer: cstring,
                       stringBufSize: int32): cstring {.gcsafe, stdcall, tags: [].}