Hi,
Dealing with any kind of time differences ought to be done using
FILETIME structures, not
GetTickCount(). Then you don't have the wrap-around problem in the first
place.
The API you need is GetSystemTimeAsFileTime(), which returns a 64-bit
value in two 32-bit
DWORDs. Arithmetic on FILETIMEs is done by transferring the FILETIME to
a ULARGE_INTEGER
and accessing the "QuadPart" member.
See MSDN docs on FILETIME structure and example below.
http://msdn.microsoft.com/en-us/library/windows/apps/ms724284%28v=vs.85%29.aspx
Cheers,
---------------
ULARGE_INTEGER uNowTime, uEndTime;
// 64-bit aligned access guaranteed on all platforms.
GetSystemTimeAsFileTime((PFILETIME) &uNowTime);
if (uNowTime.QuadPart >= uEndTime.QuadPart)
{
...
}
On 10/08/13 10:29, Ken Takata wrote:
Hi,
WaitForChar() in os_win32.c doesn't wait properly when the result of
the GetTickCount() overflows. Attached patch fixes this.
Regards,
Ken Takata
# HG changeset patch
# Parent 53e9c7a35663543713dddd91f626ff27ae9c3460
diff --git a/src/os_win32.c b/src/os_win32.c
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -1362,7 +1362,7 @@
{
/* If the specified wait time has passed, return. */
dwNow = GetTickCount();
- if (dwNow>= dwEndTime)
+ if ((int)(dwNow - dwEndTime)>= 0)
break;
}
if (msec != 0)
--
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