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/****************************************************************************
*
* Copyright (C) 2012 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,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* 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.h
* Performance measuring tools.
*/
#ifndef _SYSTEMLIB_PERF_COUNTER_H
#define _SYSTEMLIB_PERF_COUNTER_H value
#include <stdint.h>
/**
* Counter types.
*/
enum perf_counter_type {
PC_COUNT, /**< count the number of times an event occurs */
PC_ELAPSED, /**< measure the time elapsed performing an event */
PC_INTERVAL /**< measure the interval between instances of an event */
};
struct perf_ctr_header;
typedef struct perf_ctr_header *perf_counter_t;
__BEGIN_DECLS
/**
* Create a new counter.
*
* @param type The type of the new counter.
* @param name The counter name.
* @return Handle for the new counter, or NULL if a counter
* could not be allocated.
*/
__EXPORT extern perf_counter_t perf_alloc(enum perf_counter_type type, const char *name);
/**
* Free a counter.
*
* @param handle The performance counter's handle.
*/
__EXPORT extern 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.
*/
__EXPORT extern 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.
*/
__EXPORT extern 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.
*/
__EXPORT extern 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.
*/
__EXPORT extern 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.
*/
__EXPORT extern void perf_reset(perf_counter_t handle);
/**
* Print one performance counter to stdout
*
* @param handle The counter to print.
*/
__EXPORT extern 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.
*/
__EXPORT extern void perf_print_counter_fd(int fd, perf_counter_t handle);
/**
* Print all of the performance counters.
*
* @param fd File descriptor to print to - e.g. 0 for stdout
*/
__EXPORT extern void perf_print_all(int fd);
/**
* Reset all of the performance counters.
*/
__EXPORT extern void perf_reset_all(void);
/**
* Return current event_count
*
* @param handle The counter returned from perf_alloc.
* @return event_count
*/
__EXPORT extern uint64_t perf_event_count(perf_counter_t handle);
__END_DECLS
#endif
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