init: init nachos hw01, should pass jenkins os_group_20_hw job but fail on os_group_20_ta job

code/machine/stats.h

@@ -0,0 +1,60 @@
+// stats.h 
+//	Data structures for gathering statistics about Nachos performance.
+//
+// DO NOT CHANGE -- these stats are maintained by the machine emulation
+//
+//
+// Copyright (c) 1992-1993 The Regents of the University of California.
+// All rights reserved.  See copyright.h for copyright notice and limitation 
+// of liability and disclaimer of warranty provisions.
+
+#ifndef STATS_H
+#define STATS_H
+
+#include "copyright.h"
+
+// The following class defines the statistics that are to be kept
+// about Nachos behavior -- how much time (ticks) elapsed, how
+// many user instructions executed, etc.
+//
+// The fields in this class are public to make it easier to update.
+
+class Statistics {
+  public:
+    int totalTicks;      	// Total time running Nachos
+    int idleTicks;       	// Time spent idle (no threads to run)
+    int systemTicks;	 	// Time spent executing system code
+    int userTicks;       	// Time spent executing user code
+				// (this is also equal to # of
+				// user instructions executed)
+
+    int numDiskReads;		// number of disk read requests
+    int numDiskWrites;		// number of disk write requests
+    int numConsoleCharsRead;	// number of characters read from the keyboard
+    int numConsoleCharsWritten; // number of characters written to the display
+    int numPageFaults;		// number of virtual memory page faults
+    int numPacketsSent;		// number of packets sent over the network
+    int numPacketsRecvd;	// number of packets received over the network
+
+    Statistics(); 		// initialize everything to zero
+
+    void Print();		// print collected statistics
+};
+
+// Constants used to reflect the relative time an operation would
+// take in a real system.  A "tick" is a just a unit of time -- if you 
+// like, a microsecond.
+//
+// Since Nachos kernel code is directly executed, and the time spent
+// in the kernel measured by the number of calls to enable interrupts,
+// these time constants are none too exact.
+
+const int UserTick = 	   1;	// advance for each user-level instruction 
+const int SystemTick =	  10; 	// advance each time interrupts are enabled
+const int RotationTime = 500; 	// time disk takes to rotate one sector
+const int SeekTime =	 500;  	// time disk takes to seek past one track
+const int ConsoleTime =	 100;	// time to read or write one character
+const int NetworkTime =	 100;  	// time to send or receive one packet
+const int TimerTicks = 	 100;  	// (average) time between timer interrupts
+
+#endif // STATS_H