Process.h

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/*
 * Process.h
 *
 * Smalltalk like class library for C++
 * Process wrapper. Header.
 *
 * Copyright (c) 2004 Milan Cermak
 */
/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#ifndef __PROCESS_H
#define __PROCESS_H

#if !defined(_REENTRANT)
#  define _REENTRANT
#endif
#include <unistd.h>
#include <signal.h>

#include <stlib/Object.h>
#include <stlib/Array.h>
#include <stlib/Set.h>

#include <stlib/Callback0.h>
#include <stlib/Callback1.h>

namespace OS {

class Process : public Core::Object
{
  private:
    static bool has_handler;

  protected:
    Callback<void> *_receiver;   // what to do in the process
    Array *_arguments;

    int process_id;
    int _status;
    bool runningProcess;          // running process flag

    static Set processes;

  protected:
    Process(void);

  public:
    Process(Callback<void> *receiver, Array *args = nil);
    virtual ~Process(void);

    /* Instance creation protocol */
    static Process *fork(Callback<void> *receiver);
    static Process *fork(Callback<void> *receiver, Array *args);

    template <class TReceiver>
    static Process *fork(TReceiver *receiver, void (TReceiver::*execFunc)(void))
    {
        Callback0<TReceiver,void> *callback;
        callback = new Callback0<TReceiver,void>(receiver, execFunc);
        return fork(callback);
    }

    template <class TReceiver>
    static Process *fork(TReceiver *receiver, void (TReceiver::*execFunc)(Array *),
                         Array *args)
    {
        Callback1<TReceiver,void,Array*> *callback;
        callback = new Callback1<TReceiver,void,Array*>(receiver, execFunc);
        return fork(callback, args);
    }

    static Process *forkJob(String *progName, SequenceableCollection *args = nil,
                            SequenceableCollection *fds = nil);

    static void finalizeProcesses(void);

    /* Accessing protocol */
    virtual void arguments(Array *args);
    virtual void receiver(Callback<void> *obj);
    virtual int status(void);

    /* Controlling protocol */
    virtual void resume(void);
    virtual void run(void);
    virtual void finalize(void);
    virtual void suspend(void);
    virtual void terminate(void);
    virtual void yield(void);

    /* Testing protocol */
    virtual bool isRunning(void);

    /* Private protocol */
    virtual void childSignaled(void);

  private:
    void privateExecuteJob(Array *args);
    static void sigchildHandler(int signum);
};

};

#endif /* __PROCESS_H */

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