Changeset 948 for trunk/dll/tmrsvcs.c

Timestamp:

Feb 12, 2008, 6:20:47 AM (18 years ago)

Author:

Steven Levine

Message:

Rework collector progress reporting and improve performance (ticket #79)

File:

• trunk/dll/tmrsvcs.c (modified) (3 diffs)

trunk/dll/tmrsvcs.c

@@ -21 +21 @@
 /**
  * Prepare interval timer descriptor for use
+ * Call with interval 0 to to reset internal estimators
  * @param pTD point to interval timer descriptor
  * @param interval_msec is the timer interval in msec or 0 to retain existing value
@@ -27 +28 @@
 VOID InitITimer(ITIMER_DESC *pitd, UINT interval_msec)
 {
-  if (interval_msec)
+  if (interval_msec) {
+    // Assume starting new loop at similar rate
     pitd->interval_msec = interval_msec;
-  pitd->remaining = pitd->estimated;
+    pitd->remaining = pitd->estimated;
+  }
+  else {
+    // Assume loop rate is changing to a significantly lower value
+    pitd->remaining = 0;
+    pitd->estimated = 1;                // Force rate recalc
+  }
   DosQuerySysInfo(QSV_MS_COUNT, QSV_MS_COUNT, &pitd->start_msec, sizeof(pitd->start_msec));
 }
@@ -35 +43 @@
 /**
  * Check timer interval expired
+ * Attempts to optimize calls to fetch QSV_MS_COUNT
+ * Caller should reinit if processing rate changes
  * @return TRUE if expired
  */