--- time.c Wed Jun 16 20:06:54 1999
+++ time1.c Tue Jan 30 09:15:59 2001
@@ -21,22 +21,88 @@
#include <mmsystem.h>
#include <errno.h>
+int getfilesystemtime(struct timeval *time_Info)
+{
+FILETIME ft;
+__int64 ff;
+
+ GetSystemTimeAsFileTime(&ft); /* 100 ns blocks since 01-Jan-1641 */
+ /* resolution seems to be 0.01 sec */
+ ff = *(__int64*)(&ft);
+ time_Info->tv_sec = (int)(ff/(__int64)10000000-(__int64)11644473600);
+ time_Info->tv_usec = (int)(ff % 10000000)/10;
+ return 0;
+}
+
int gettimeofday(struct timeval *time_Info, struct timezone *timezone_Info)
{
- _int64 mstimer, freq;
+static struct timeval starttime = {0, 0};
+static __int64 lasttime = 0;
+static __int64 freq = 0;
+__int64 timer;
+LARGE_INTEGER li;
+BOOL b;
+double dt;
+
/* Get the time, if they want it */
if (time_Info != NULL) {
- time_Info->tv_sec = time(NULL);
- /* get ticks-per-second of the performance counter
- Note the necessary typecast to a LARGE_INTEGER structure
- */
- if (!QueryPerformanceFrequency((LARGE_INTEGER *) & freq)) {
- time_Info->tv_usec = 0;
- } else {
- QueryPerformanceCounter((LARGE_INTEGER *) &
mstimer);
- mstimer = (__int64) (mstimer * .8);
- time_Info->tv_usec = (long) (mstimer % 0x0FFFFFFF);
- }
+ if (starttime.tv_sec == 0) {
+ b = QueryPerformanceFrequency(&li);
+ if (!b) {
+ starttime.tv_sec = -1;
+ }
+ else {
+ freq = li.QuadPart;
+ b = QueryPerformanceCounter(&li);
+ if (!b) {
+ starttime.tv_sec = -1;
+ }
+ else {
+ getfilesystemtime(&starttime);
+ timer = li.QuadPart;
+ dt = (double)timer/freq;
+ starttime.tv_usec -= (int)((dt-(int)dt)*1000000);
+ if (starttime.tv_usec < 0) {
+ starttime.tv_usec += 1000000;
+ --starttime.tv_sec;
+ }
+ starttime.tv_sec -= (int)dt;
+ }
+ }
+ }
+ if (starttime.tv_sec > 0) {
+ b = QueryPerformanceCounter(&li);
+ if (!b) {
+ starttime.tv_sec = -1;
+ }
+ else {
+ timer = li.QuadPart;
+ if (timer < lasttime) {
+ getfilesystemtime(time_Info);
+ dt = (double)timer/freq;
+ starttime = *time_Info;
+ starttime.tv_usec -= (int)((dt-(int)dt)*1000000);
+ if (starttime.tv_usec < 0) {
+ starttime.tv_usec += 1000000;
+ --starttime.tv_sec;
+ }
+ starttime.tv_sec -= (int)dt;
+ }
+ else {
+ lasttime = timer;
+ dt = (double)timer/freq;
+ time_Info->tv_sec = starttime.tv_sec + (int)dt;
+ time_Info->tv_usec = starttime.tv_usec +
(int)((dt-(int)dt)*1000000);
+ if (time_Info->tv_usec > 1000000) {
+ time_Info->tv_usec -= 1000000;
+ ++time_Info->tv_sec;
+ }
+ }
+ }
+ }
+ if (starttime.tv_sec < 0) {
+ getfilesystemtime(time_Info);
+ }
}
/* Get the timezone, if they want it */
if (timezone_Info != NULL) {
@@ -52,21 +118,30 @@
/* this usleep isnt exactly accurate but should do ok */
void usleep(unsigned int useconds)
{
- __int64 mstimer, freq;
- long now, then;
- if (QueryPerformanceFrequency((LARGE_INTEGER *) & freq)) {
- QueryPerformanceCounter((LARGE_INTEGER *) & mstimer);
- now = (long) (((__int64) (mstimer * .8)) % 0x0FFFFFFF);
- then = now + useconds;
- while (now < then) {
- QueryPerformanceCounter((LARGE_INTEGER *) &
mstimer);
- now = (long) (((__int64) (mstimer * .8)) %
0x0FFFFFFF);
- }
- } else {
- /*workaround for systems without performance counter
- this is actualy a millisecond sleep */
- Sleep((int) (useconds / 1000));
- }
+struct timeval tnow, tthen, t0;
+
+ gettimeofday(&tthen, NULL);
+ t0 = tthen;
+ tthen.tv_usec += useconds;
+ while (tthen.tv_usec > 1000000) {
+ tthen.tv_usec -= 1000000;
+ tthen.tv_sec++;
+ }
+ if (useconds > 10000) {
+ useconds -= 10000;
+ Sleep(useconds/1000);
+ }
+ while (1) {
+ gettimeofday(&tnow, NULL);
+ if (tnow.tv_sec > tthen.tv_sec) {
+ break;
+ }
+ if (tnow.tv_sec == tthen.tv_sec) {
+ if (tnow.tv_usec > tthen.tv_usec) {
+ break;
+ }
+ }
+ }
}
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