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/*
(c) Copyright 2001-2009 The world wide DirectFB Open Source Community (directfb.org)
(c) Copyright 2000-2004 Convergence (integrated media) GmbH
All rights reserved.
Written by Denis Oliver Kropp <dok@directfb.org>,
Andreas Hundt <andi@fischlustig.de>,
Sven Neumann <neo@directfb.org>,
Ville Syrjälä <syrjala@sci.fi> and
Claudio Ciccani <klan@users.sf.net>.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#include <config.h>
#include <direct/clock.h>
#include <direct/debug.h>
#include <direct/util.h>
#ifdef CLOCK_MONOTONIC
#include <sys/syscall.h>
#endif
#include <sys/time.h>
#include <time.h>
D_DEBUG_DOMAIN( Direct_Clock, "Direct/Clock", "Time measurement etc." );
static struct timeval start_time = { 0, 0 };
/* libc has incredibly messy way of doing this,
* typically requiring -lrt. We just skip all this mess */
struct timeval*
direct_monotonic_gettimeofday( struct timeval *tv )
{
struct timespec ts;
#ifdef CLOCK_MONOTONIC
/* No locking or atomic ops for no_monotonic here */
static int no_monotonic = 0;
if (!no_monotonic)
if(syscall( __NR_clock_gettime, CLOCK_MONOTONIC, &ts ))
no_monotonic = 1;
if (no_monotonic)
if(syscall(__NR_clock_gettime, CLOCK_REALTIME, &ts))
#endif
{
gettimeofday( tv, NULL );
return tv;
}
tv->tv_sec = ts.tv_sec;
tv->tv_usec = ts.tv_nsec / 1000;
return tv;
}
long long
direct_clock_get_micros( void )
{
struct timeval tv;
long long ret;
if (start_time.tv_sec == 0) {
direct_monotonic_gettimeofday( &start_time );
return 0;
}
direct_monotonic_gettimeofday( &tv );
ret = (long long)(tv.tv_sec - start_time.tv_sec) * 1000000LL +
(long long)(tv.tv_usec - start_time.tv_usec);
if (ret < 0) {
D_DEBUG_AT( Direct_Clock, "Clock skew detected (%lld in the past)!\n", -ret );
start_time = tv;
ret = 0;
}
return ret;
}
long long
direct_clock_get_millis( void )
{
return direct_clock_get_micros() / 1000LL;
}
void
direct_clock_set_start( const struct timeval *start )
{
long long diff;
D_ASSERT( start != NULL );
diff = (long long)(start->tv_sec - start_time.tv_sec) * 1000LL +
(long long)(start->tv_usec - start_time.tv_usec) / 1000LL;
D_DEBUG_AT( Direct_Clock, "Adjusting start time "
"(%lld.%lld seconds diff)\n", diff / 1000LL, ABS(diff) % 1000LL );
start_time = *start;
}
long long
direct_clock_get_abs_micros( void )
{
struct timeval tv;
direct_monotonic_gettimeofday( &tv );
return (long long)(tv.tv_sec) * 1000000LL + (long long)(tv.tv_usec);
}
long long
direct_clock_get_abs_millis( void )
{
return direct_clock_get_abs_micros() / 1000LL;
}
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