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/* -*- C++ -*- */
/*
* Software Bluetooth Hands-Free Implementation
*
* Copyright (C) 2006-2008 Sam Revitch <samr7@cs.washington.edu>
*
* 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 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#if !defined(__PRIVATE_OPLATENCY_H__)
#define __PRIVATE_OPLATENCY_H__
#if !defined(NDEBUG)
#define DO_OPLATENCY
#endif
#if defined(DO_OPLATENCY)
#include <sys/time.h>
#include <libhfp/events.h>
#endif /* defined(DO_OPLATENCY) */
/*
* Problems can be caused by a function incurring higher than expected
* CPU usage, or more commonly, unexpectedly blocking in the kernel.
*
* To diagnose operations incurring more latency than expected, we
* use the OpLatencyMonitor class. We instantiate one on the stack
* frame of a function or block to be monitored.
*/
class OpLatencyMonitor {
public:
#if defined(DO_OPLATENCY)
libhfp::DispatchInterface *m_di;
const char *m_label;
int m_trigger;
struct timeval m_start;
OpLatencyMonitor(libhfp::DispatchInterface *di, const char *label,
int trigger_ms = 10)
: m_di(di), m_label(label), m_trigger(trigger_ms) {
gettimeofday(&m_start, NULL);
}
~OpLatencyMonitor() {
struct timeval rtv;
gettimeofday(&rtv, NULL);
/* Make sure time doesn't go backwards */
if (timercmp(&m_start, &rtv, <)) {
timersub(&rtv, &m_start, &rtv);
if ((rtv.tv_sec > (m_trigger / 1000)) ||
((rtv.tv_sec == (m_trigger / 1000)) &&
((rtv.tv_usec / 1000) > (m_trigger % 1000)))) {
m_di->LogDebug("** OpLatency: %s took %ldms",
m_label,
(rtv.tv_sec * 1000) +
(rtv.tv_usec / 1000));
}
}
}
#else /* defined(DO_OPLATENCY) */
OpLatencyMonitor(libhfp::DispatchInterface *, const char *,
int trig = 0) {}
#endif /* defined(DO_OPLATENCY) */
};
#endif /* !defined(__PRIVATE_OPLATENCY_H__) */
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