text: /****************************************************************************
   *
   *   Copyright (C) 2012 - 2014 PX4 Development Team. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   * 3. Neither the name PX4 nor the names of its contributors may be
   *    used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   ****************************************************************************/
  
  /*
   * @file perf_counter.cpp
   *
   * Empty function calls for ros compatibility
   *
   * @author Roman Bapst <bapstr@ethz.ch>
   *
   */
  #include <stdlib.h>
  #include <stdio.h>
  #include <systemlib/perf_counter.h>
  
  
  
  perf_counter_t	perf_alloc(enum perf_counter_type type, const char *name)
  {
  	return NULL;
  }
  
  /**
   * Free a counter.
   *
   * @param handle		The performance counter's handle.
   */
  void perf_free(perf_counter_t handle)
  {
  
  }
  
  /**
   * Count a performance event.
   *
   * This call only affects counters that take single events; PC_COUNT, PC_INTERVAL etc.
   *
   * @param handle		The handle returned from perf_alloc.
   */
  void		perf_count(perf_counter_t handle)
  {
  
  }
  
  /**
   * Begin a performance event.
   *
   * This call applies to counters that operate over ranges of time; PC_ELAPSED etc.
   *
   * @param handle		The handle returned from perf_alloc.
   */
  void		perf_begin(perf_counter_t handle)
  {
  
  }
  
  /**
   * End a performance event.
   *
   * This call applies to counters that operate over ranges of time; PC_ELAPSED etc.
   * If a call is made without a corresopnding perf_begin call, or if perf_cancel
   * has been called subsequently, no change is made to the counter.
   *
   * @param handle		The handle returned from perf_alloc.
   */
  void		perf_end(perf_counter_t handle)
  {
  
  }
  
  /**
   * Cancel a performance event.
   *
   * This call applies to counters that operate over ranges of time; PC_ELAPSED etc.
   * It reverts the effect of a previous perf_begin.
   *
   * @param handle		The handle returned from perf_alloc.
   */
  void		perf_cancel(perf_counter_t handle)
  {
  
  }
  
  /**
   * Reset a performance counter.
   *
   * This call resets performance counter to initial state
   *
   * @param handle		The handle returned from perf_alloc.
   */
  void		perf_reset(perf_counter_t handle)
  {
  
  }
  
  /**
   * Print one performance counter to stdout
   *
   * @param handle		The counter to print.
   */
  void		perf_print_counter(perf_counter_t handle)
  {
  
  }
  
  /**
   * Print one performance counter to a fd.
   *
   * @param fd			File descriptor to print to - e.g. 0 for stdout
   * @param handle		The counter to print.
   */
  void		perf_print_counter_fd(int fd, perf_counter_t handle)
  {
  
  }
  
  int		perf_print_counter_buffer(char *buffer, int length, perf_counter_t handle)
  {
  	return 0;
  }
  
  void	perf_iterate_all(perf_callback cb, void *user)
  {
  
  }
  
  /**
   * Print all of the performance counters.
   *
   * @param fd			File descriptor to print to - e.g. 0 for stdout
   */
  void		perf_print_all(int fd)
  {
  
  }
  
  /**
   * Reset all of the performance counters.
   */
  void		perf_reset_all(void)
  {
  
  }
  
  /**
   * Return current event_count
   *
   * @param handle		The counter returned from perf_alloc.
   * @return			event_count
   */
  uint64_t	perf_event_count(perf_counter_t handle)
  {
  	return 0;
  }
  