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/* Support for mach's mapped time
Copyright (C) 1996, 1997, 2000, 2007 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.org>
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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#ifndef __MAPTIME_H__
#define __MAPTIME_H__
#include <mach/time_value.h>
#include <sys/time.h>
#include <errno.h>
#include <features.h>
#ifdef MAPTIME_DEFINE_EI
#define MAPTIME_EI
#else
#define MAPTIME_EI __extern_inline
#endif
/* Return the mach mapped time page in MTIME. If USE_MACH_DEV is false, then
the hurd time device DEV_NAME, or "/dev/time" if DEV_NAME is 0, is
used. If USE_MACH_DEV is true, the mach device DEV_NAME, or "time" if
DEV_NAME is 0, is used; this is a privileged operation. The mapped time
may be converted to a struct timeval at any time using maptime_read. */
error_t maptime_map (int use_mach_dev, char *dev_name,
volatile struct mapped_time_value **mtime);
extern void maptime_read (volatile struct mapped_time_value *mtime, struct timeval *tv);
#if defined(__USE_EXTERN_INLINES) || defined(MAPTIME_DEFINE_EI)
/* Read the current time from MTIME into TV. This should be very fast. */
MAPTIME_EI void
maptime_read (volatile struct mapped_time_value *mtime, struct timeval *tv)
{
do
{
tv->tv_sec = mtime->seconds;
__sync_synchronize ();
tv->tv_usec = mtime->microseconds;
__sync_synchronize ();
}
while (tv->tv_sec != mtime->check_seconds);
}
#endif /* Use extern inlines. */
#endif /* __MAPTIME_H__ */
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