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91 lines
3.2 KiB
C
91 lines
3.2 KiB
C
/*
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* FILE: perf.c
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* AUTHORS: Isidor Kouvelas
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* Colin Perkins
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* Mark Handley
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* Orion Hodson
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* Jerry Isdale
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*
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* $Revision: 1.1 $
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* $Date: 2007/11/08 09:48:59 $
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*
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* Copyright (c) 1995-2000 University College London
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, is permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the Computer Science
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* Department at University College London
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* 4. Neither the name of the University nor of the Department may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined PERF && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1))
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#include "config.h"
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#include "config_unix.h"
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#include "config_win32.h"
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#include "debug.h"
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#include "perf.h"
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#include <sys/types.h>
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#include <string.h>
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static volatile size_t _uvp_offset;
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static int _uvp_id;
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static char *_uvp_shm;
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void perf_init()
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{
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_uvp_id = shmget(_uvp_key, BUFFER_LEN, IPC_CREAT | 0666);
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_uvp_shm = shmat(_uvp_id, NULL, 0);
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_uvp_offset = 0;
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}
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void perf_record(_uvp_event_t event, _uvp_arg_t arg)
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{
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size_t current;
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struct timeval tv;
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char *ptr;
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gettimeofday(&tv, NULL);
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current = __sync_fetch_and_add(&_uvp_offset, ENTRY_LEN);
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if(current == BUFFER_LEN)
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{
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_uvp_offset = 0;
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current = 0;
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} else if (current > BUFFER_LEN) {
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while((current = __sync_fetch_and_add(&_uvp_offset, ENTRY_LEN)) > BUFFER_LEN)
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;
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}
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ptr = _uvp_shm + current;
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((struct _uvp_entry *) ptr)->tv_sec = tv.tv_sec;
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((struct _uvp_entry *) ptr)->tv_usec = tv.tv_usec;
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((struct _uvp_entry *) ptr)->event = event;
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((struct _uvp_entry *) ptr)->arg = arg;
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}
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#endif /* PERF && __GNUC__ */
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