Revert "Fix inaccurate ticks in windows port (FreeRTOS#142)" (FreeRTOS#143)

This reverts commit d85fd46.

Author: cobusve

portable/MSVC-MingW/port.c

@@ -22,6 +22,7 @@
  * https://www.FreeRTOS.org
  * https://github.com/FreeRTOS
  *
+ * 1 tab == 4 spaces!
  */
 
 /* Standard includes. */
@@ -139,9 +140,6 @@ static DWORD WINAPI prvSimulatedPeripheralTimer( LPVOID lpParameter )
 {
 TickType_t xMinimumWindowsBlockTime;
 TIMECAPS xTimeCaps;
-TickType_t xWaitTimeBetweenTicks = portTICK_PERIOD_MS;
-HANDLE hTimer = NULL;
-LARGE_INTEGER liDueTime;
 
 	/* Set the timer resolution to the maximum possible. */
 	if( timeGetDevCaps( &xTimeCaps, sizeof( xTimeCaps ) ) == MMSYSERR_NOERROR )
@@ -161,32 +159,22 @@ LARGE_INTEGER liDueTime;
 	/* Just to prevent compiler warnings. */
 	( void ) lpParameter;
 
-	/* Tick time for the timer is adjusted with the maximum available
-	 resolution. */
-	if( portTICK_PERIOD_MS < xMinimumWindowsBlockTime )
-	{
-		xWaitTimeBetweenTicks = xMinimumWindowsBlockTime;
-	}
-
-	/* Convert the tick time in milliseconds to nanoseconds resolution
-	 for the Waitable Timer. */
-	liDueTime.u.LowPart = xWaitTimeBetweenTicks * 1000 * 1000;
-	liDueTime.u.HighPart = 0;
-
-	/* Create a synchronization Waitable Timer.*/
-	hTimer = CreateWaitableTimer( NULL, FALSE, NULL );
-
-	configASSERT( hTimer != NULL );
-
-	/* Set the Waitable Timer. The timer is set to run periodically at every
-	xWaitTimeBetweenTicks milliseconds. */
-	configASSERT( SetWaitableTimer( hTimer, &liDueTime, xWaitTimeBetweenTicks, NULL, NULL, 0 ) );
-
 	for( ;; )
 	{
 		/* Wait until the timer expires and we can access the simulated interrupt
-		variables. */
-		WaitForSingleObject( hTimer, INFINITE );
+		variables.  *NOTE* this is not a 'real time' way of generating tick
+		events as the next wake time should be relative to the previous wake
+		time, not the time that Sleep() is called.  It is done this way to
+		prevent overruns in this very non real time simulated/emulated
+		environment. */
+		if( portTICK_PERIOD_MS < xMinimumWindowsBlockTime )
+		{
+			Sleep( xMinimumWindowsBlockTime );
+		}
+		else
+		{
+			Sleep( portTICK_PERIOD_MS );
+		}
 
 		configASSERT( xPortRunning );