// progtest.cc 
//	Test routines for demonstrating that Nachos can load
//	a user program and execute it.  
//
//	Also, routines for testing the Console hardware device.
//
// 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.

#include "console.h"
#include "synch.h"


// Data structures needed for the console test.  Threads making
// I/O requests wait on a Semaphore to delay until the I/O completes.

static Console *console;
static Semaphore *readAvail;
static Semaphore *writeDone;

//----------------------------------------------------------------------
// ConsoleInterruptHandlers
// 	Wake up the thread that requested the I/O.
//----------------------------------------------------------------------

static void ReadAvail(int arg) { readAvail->V(); }
static void WriteDone(int arg) { writeDone->V(); }

//----------------------------------------------------------------------
// ConsoleTest
// 	Test the console by echoing characters typed at the input onto
//	the output.  Stop when the user types a 'q'.
//----------------------------------------------------------------------

void  ConsoleTest (char *in, char *out)
{
    char ch;

    console = new Console(in, out, ReadAvail, WriteDone, 0);
    readAvail = new Semaphore("read avail", 0);
    writeDone = new Semaphore("write done", 0);
    
    for (;;) {
	readAvail->P();		// wait for character to arrive
	ch = console->GetChar();
	console->PutChar(ch);	// echo it!
	writeDone->P() ;        // wait for write to finish
	if (ch == 'q') return;  // if q, quit
    }
}