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/*****************************************************************************
* vlc_mtime.h: high resolution time management functions
*****************************************************************************
* This header provides portable high precision time management functions,
* which should be the only ones used in other segments of the program, since
* functions like gettimeofday() and ftime() are not always supported.
* Most functions are declared as inline or as macros since they are only
* interfaces to system calls and have to be called frequently.
* 'm' stands for 'micro', since maximum resolution is the microsecond.
* Functions prototyped are implemented in interface/mtime.c.
*****************************************************************************
* Copyright (C) 1996, 1997, 1998, 1999, 2000 the VideoLAN team
* $Id: 8d51250dab38177845a3c4ff2fab79e30128506c $
*
* Authors: Vincent Seguin <seguin@via.ecp.fr>
*
* 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 of the License, 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 Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#ifndef __VLC_MTIME_H
# define __VLC_MTIME_H 1
/*****************************************************************************
* LAST_MDATE: date which will never happen
*****************************************************************************
* This date can be used as a 'never' date, to mark missing events in a function
* supposed to return a date, such as nothing to display in a function
* returning the date of the first image to be displayed. It can be used in
* comparaison with other values: all existing dates will be earlier.
*****************************************************************************/
#define LAST_MDATE ((mtime_t)((uint64_t)(-1)/2))
/*****************************************************************************
* MSTRTIME_MAX_SIZE: maximum possible size of mstrtime
*****************************************************************************
* This values is the maximal possible size of the string returned by the
* mstrtime() function, including '-' and the final '\0'. It should be used to
* allocate the buffer.
*****************************************************************************/
#define MSTRTIME_MAX_SIZE 22
/*****************************************************************************
* Prototypes
*****************************************************************************/
VLC_EXPORT( char *, mstrtime, ( char *psz_buffer, mtime_t date ) );
VLC_EXPORT( mtime_t, mdate, ( void ) );
VLC_EXPORT( void, mwait, ( mtime_t date ) );
VLC_EXPORT( void, msleep, ( mtime_t delay ) );
VLC_EXPORT( char *, secstotimestr, ( char *psz_buffer, int32_t secs ) );
# define VLC_HARD_MIN_SLEEP 10000 /* 10 milliseconds = 1 tick at 100Hz */
#if defined (__GNUC__) \
&& ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
/* Linux has 100, 250, 300 or 1000Hz
*
* HZ=100 by default on FreeBSD, but some architectures use a 1000Hz timer
*/
# define VLC_SOFT_MIN_SLEEP 9000000 /* 9 seconds */
static
__attribute__((unused))
__attribute__((noinline))
__attribute__((error("sorry, cannot sleep for such short a time")))
mtime_t impossible_delay( mtime_t delay )
{
(void) delay;
return VLC_HARD_MIN_SLEEP;
}
static
__attribute__((unused))
__attribute__((noinline))
__attribute__((warning("use proper event handling instead of short delay")))
mtime_t harmful_delay( mtime_t delay )
{
return delay;
}
# define check_delay( d ) \
((__builtin_constant_p(d < VLC_HARD_MIN_SLEEP) \
&& (d < VLC_HARD_MIN_SLEEP)) \
? impossible_delay(d) \
: ((__builtin_constant_p(d < VLC_SOFT_MIN_SLEEP) \
&& (d < VLC_SOFT_MIN_SLEEP)) \
? harmful_delay(d) \
: d))
static
__attribute__((unused))
__attribute__((noinline))
__attribute__((error("deadlines can not be constant")))
mtime_t impossible_deadline( mtime_t deadline )
{
return deadline;
}
# define check_deadline( d ) \
(__builtin_constant_p(d) ? impossible_deadline(d) : d)
#else
# define check_delay(d) (d)
# define check_deadline(d) (d)
#endif
#define msleep(d) msleep(check_delay(d))
#define mwait(d) mwait(check_deadline(d))
/*****************************************************************************
* date_t: date incrementation without long-term rounding errors
*****************************************************************************/
struct date_t
{
mtime_t date;
uint32_t i_divider_num;
uint32_t i_divider_den;
uint32_t i_remainder;
};
VLC_EXPORT( void, date_Init, ( date_t *, uint32_t, uint32_t ) );
VLC_EXPORT( void, date_Change, ( date_t *, uint32_t, uint32_t ) );
VLC_EXPORT( void, date_Set, ( date_t *, mtime_t ) );
VLC_EXPORT( mtime_t, date_Get, ( const date_t * ) );
VLC_EXPORT( void, date_Move, ( date_t *, mtime_t ) );
VLC_EXPORT( mtime_t, date_Increment, ( date_t *, uint32_t ) );
VLC_EXPORT( mtime_t, date_Decrement, ( date_t *, uint32_t ) );
VLC_EXPORT( uint64_t, NTPtime64, ( void ) );
#endif /* !__VLC_MTIME_ */
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