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