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Cache the result of TIME_GetBias for up to 1 second.

This commit is contained in:
Huw Davies 2004-02-27 00:43:20 +00:00 committed by Alexandre Julliard
parent cc5d49f8cb
commit 67e2d6cb4d
1 changed files with 29 additions and 5 deletions
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34
dlls/ntdll/time.c
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@ -48,6 +48,16 @@
WINE_DEFAULT_DEBUG_CHANNEL(ntdll);
static CRITICAL_SECTION TIME_GetBias_section;
static CRITICAL_SECTION_DEBUG critsect_debug =
{
0, 0, &TIME_GetBias_section,
{ &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
0, 0, { 0, (DWORD)(__FILE__ ": TIME_GetBias_section") }
};
static CRITICAL_SECTION TIME_GetBias_section = { &critsect_debug, -1, 0, 0, 0, 0 };
#define SETTIME_MAX_ADJUST 120
/* This structure is used to store strings that represent all of the time zones
@ -481,11 +491,25 @@ BOOLEAN WINAPI RtlTimeFieldsToTime(
*/
static int TIME_GetBias(time_t utc, int *pdaylight)
{
struct tm *ptm = localtime(&utc);
*pdaylight = ptm->tm_isdst; /* daylight for local timezone */
ptm = gmtime(&utc);
ptm->tm_isdst = *pdaylight; /* use local daylight, not that of Greenwich */
return (int)(utc-mktime(ptm));
struct tm *ptm;
static time_t last_utc;
static int last_bias;
int ret;
RtlEnterCriticalSection( &TIME_GetBias_section );
if(utc == last_utc)
ret = last_bias;
else
{
ptm = localtime(&utc);
*pdaylight = ptm->tm_isdst; /* daylight for local timezone */
ptm = gmtime(&utc);
ptm->tm_isdst = *pdaylight; /* use local daylight, not that of Greenwich */
last_utc = utc;
ret = last_bias = (int)(utc-mktime(ptm));
}
RtlLeaveCriticalSection( &TIME_GetBias_section );
return ret;
}
/******************************************************************************