Signal.h

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/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * Written (W) 1999-2009 Soeren Sonnenburg
 * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
 */

#ifndef __SIGNAL__H_
#define __SIGNAL__H_

#include <shogun/lib/config.h>

#ifndef DISABLE_CANCEL_CALLBACK
namespace shogun
{
extern void (*sg_cancel_computations)(bool &delayed, bool &immediately);
}
#endif

#include <shogun/lib/config.h>
#include <shogun/lib/ShogunException.h>
#include <shogun/base/SGObject.h>

#ifndef WIN32
#include <signal.h>
#define NUMTRAPPEDSIGS 2

namespace shogun
{
class CSignal : public CSGObject
{
    public:
        CSignal();
        virtual ~CSignal();

        static void handler(int signal);

        static bool set_handler();

        static bool unset_handler();

        static void clear();

        static void clear_cancel();

        static void set_cancel(bool immediately=false);

        static inline bool cancel_computations()
        {
#ifndef DISABLE_CANCEL_CALLBACK
            if (sg_cancel_computations)
                sg_cancel_computations(cancel_computation, cancel_immediately);
#endif
            if (cancel_immediately)
                throw ShogunException("Computations have been cancelled immediately");

            return cancel_computation;
        }

        virtual const char* get_name() const { return "Signal"; }

    protected:
        static int signals[NUMTRAPPEDSIGS];

        static struct sigaction oldsigaction[NUMTRAPPEDSIGS];

        static bool active;

        static bool cancel_computation;

        static bool cancel_immediately;
};
}
#endif // WIN32
#endif // __SIGNAL__H_