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

code/userprog/synchconsole.h

@@ -0,0 +1,53 @@
+// synchconsole.h 
+//	Data structures for synchronized access to the keyboard
+//	and console display devices.
+//
+//	NOTE: this abstraction is not completely implemented.
+//
+// Copyright (c) 1992-1996 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 SYNCHCONSOLE_H
+#define SYNCHCONSOLE_H
+
+#include "copyright.h"
+#include "utility.h"
+#include "callback.h"
+#include "console.h"
+#include "synch.h"
+
+// The following two classes define synchronized input and output to
+// a console device
+
+class SynchConsoleInput : public CallBackObj {
+  public:
+    SynchConsoleInput(char *inputFile); // Initialize the console device
+    ~SynchConsoleInput();		// Deallocate console device
+
+    char GetChar();		// Read a character, waiting if necessary
+    
+  private:
+    ConsoleInput *consoleInput;	// the hardware keyboard
+    Lock *lock;			// only one reader at a time
+    Semaphore *waitFor;		// wait for callBack
+
+    void CallBack();		// called when a keystroke is available
+};
+
+class SynchConsoleOutput : public CallBackObj {
+  public:
+    SynchConsoleOutput(char *outputFile); // Initialize the console device
+    ~SynchConsoleOutput();
+
+    void PutChar(char ch);	// Write a character, waiting if necessary
+   
+  private:
+    ConsoleOutput *consoleOutput;// the hardware display
+    Lock *lock;			// only one writer at a time
+    Semaphore *waitFor;		// wait for callBack
+
+    void CallBack();		// called when more data can be written
+};
+
+#endif // SYNCHCONSOLE_H