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

code/userprog/synchconsole.cc

@@ -0,0 +1,119 @@
+// synchconsole.cc 
+//	Routines providing synchronized access to the keyboard 
+//	and console display hardware devices.
+//
+// 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.
+
+#include "copyright.h"
+#include "synchconsole.h"
+
+//----------------------------------------------------------------------
+// SynchConsoleInput::SynchConsoleInput
+//      Initialize synchronized access to the keyboard
+//
+//      "inputFile" -- if NULL, use stdin as console device
+//              otherwise, read from this file
+//----------------------------------------------------------------------
+
+SynchConsoleInput::SynchConsoleInput(char *inputFile)
+{
+    consoleInput = new ConsoleInput(inputFile, this);
+    lock = new Lock("console in");
+    waitFor = new Semaphore("console in", 0);
+}
+
+//----------------------------------------------------------------------
+// SynchConsoleInput::~SynchConsoleInput
+//      Deallocate data structures for synchronized access to the keyboard
+//----------------------------------------------------------------------
+
+SynchConsoleInput::~SynchConsoleInput()
+{ 
+    delete consoleInput; 
+    delete lock; 
+    delete waitFor;
+}
+
+//----------------------------------------------------------------------
+// SynchConsoleInput::GetChar
+//      Read a character typed at the keyboard, waiting if necessary.
+//----------------------------------------------------------------------
+
+char
+SynchConsoleInput::GetChar()
+{
+    char ch;
+
+    lock->Acquire();
+    waitFor->P();	// wait for EOF or a char to be available.
+    ch = consoleInput->GetChar();
+    lock->Release();
+    return ch;
+}
+
+//----------------------------------------------------------------------
+// SynchConsoleInput::CallBack
+//      Interrupt handler called when keystroke is hit; wake up
+//	anyone waiting.
+//----------------------------------------------------------------------
+
+void
+SynchConsoleInput::CallBack()
+{
+    waitFor->V();
+}
+
+//----------------------------------------------------------------------
+// SynchConsoleOutput::SynchConsoleOutput
+//      Initialize synchronized access to the console display
+//
+//      "outputFile" -- if NULL, use stdout as console device
+//              otherwise, read from this file
+//----------------------------------------------------------------------
+
+SynchConsoleOutput::SynchConsoleOutput(char *outputFile)
+{
+    consoleOutput = new ConsoleOutput(outputFile, this);
+    lock = new Lock("console out");
+    waitFor = new Semaphore("console out", 0);
+}
+
+//----------------------------------------------------------------------
+// SynchConsoleOutput::~SynchConsoleOutput
+//      Deallocate data structures for synchronized access to the keyboard
+//----------------------------------------------------------------------
+
+SynchConsoleOutput::~SynchConsoleOutput()
+{ 
+    delete consoleOutput; 
+    delete lock; 
+    delete waitFor;
+}
+
+//----------------------------------------------------------------------
+// SynchConsoleOutput::PutChar
+//      Write a character to the console display, waiting if necessary.
+//----------------------------------------------------------------------
+
+void
+SynchConsoleOutput::PutChar(char ch)
+{
+    lock->Acquire();
+    consoleOutput->PutChar(ch);
+    waitFor->P();
+    lock->Release();
+}
+
+//----------------------------------------------------------------------
+// SynchConsoleOutput::CallBack
+//      Interrupt handler called when it's safe to send the next 
+//	character can be sent to the display.
+//----------------------------------------------------------------------
+
+void
+SynchConsoleOutput::CallBack()
+{
+    waitFor->V();
+}