Source: ../../libxorp/timespent.hh

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// -*- c-basic-offset: 4; tab-width: 8; indent-tabs-mode: t -*-

// Copyright (c) 2001-2004 International Computer Science Institute
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software")
// to deal in the Software without restriction, subject to the conditions
// listed in the XORP LICENSE file. These conditions include: you must
// preserve this copyright notice, and you cannot mention the copyright
// holders in advertising related to the Software without their permission.
// The Software is provided WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED. This
// notice is a summary of the XORP LICENSE file; the license in that file is
// legally binding.

// $XORP: xorp/libxorp/timespent.hh,v 1.7 2004/06/23 01:12:52 pavlin Exp $

#ifndef __LIBXORP_TIMESPENT_HH__
#define __LIBXORP_TIMESPENT_HH__

#include "libxorp/timeval.hh"

static const int TIMESPENT_LIMIT = 10;	// Time allowed in seconds.

/**
 * @short (Debugging) Used to find code that has taken too long to execute.
 *
 * It is expected that this class will not be used directly but via
 * the macros below. Thus allowing file, function and line number
 * information to be captured.
 */
class TimeSpent {
public:
    TimeSpent(const char *function, const char *file, int line, int limit)
	: _function(function), _file(file), _line(line),
	  _limit(TimeVal(limit,0))
    {
	timeval now;
	gettimeofday(&now, 0);
	_start = TimeVal(now);
    }

    /**
     * @param delta the time that has passed.
     * @return true if the alloted time has been exceeded.
     */
    bool overlimit(TimeVal& delta)
    {
	timeval now;
	gettimeofday(&now, 0);
	delta = TimeVal(now) - _start;

	return delta > _limit;
    }

    /**
     * @return true if the alloted time has been exceeded.
     */
    bool overlimit()
    {
	TimeVal delta;

	return overlimit(delta);
    }

    /**
     * Has the alloted time been exceeded? If it has print a warning message.
     */
    void check(const char *function, const char *file, int line)
    {
	TimeVal delta;

	if (overlimit(delta))
	    XLOG_WARNING("Function %s +%d %s took %s\n", function, line, file,
		   delta.str().c_str());
    }

    ~TimeSpent()
    {
	check(_function, _file, _line);
    }

private:
    TimeVal _start;
    const char *_function;
    const char *_file;
    int _line;
    TimeVal _limit;
};

#ifdef	CHECK_TIME
/**
 * To be placed in suspect method.
 */
#define	TIMESPENT()       TimeSpent _t(__FUNCTION__,__FILE__,__LINE__, \
				       TIMESPENT_LIMIT)
/**
 * Verify that thus far into the method the time limit has not been exceeded.
 *
 * If the alloted time has been exceeded a warning message will be printed.
 */
#define TIMESPENT_CHECK()	_t.check(__FUNCTION__, __FILE__, __LINE__)

/**
 * A boolean that will return true if the alloted time has been exceeded.
 */
#define TIMESPENT_OVERLIMIT()	_t.overlimit()

#else	// ! CHECK_TIME
#define	TIMESPENT()
#define TIMESPENT_CHECK()
#define TIMESPENT_OVERLIMIT()	0
#endif

#endif // __LIBXORP_TIMESPENT_HH__