jack1/config/os/macosx/time.h

/*
    Copyright (C) 2001-2003 Paul Davis
    
    This program 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 2.1 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 Lesser General Public License for more details.
    
    You should have received a copy of the GNU Lesser General Public License
    along with this program; if not, write to the Free Software 
    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

    $Id$
*/

#ifndef __jack_time_h__
#define __jack_time_h__

/*
 *  This is the MacOSX version of <jack/time.h>.  It overrides the
 *  generic version via the configure.hosts mechanism.
 */
#include <jack/types.h>
#include <mach/mach_time.h>

/* This is a kludge.  We need one global instantiation of this
 * variable in each address space.  So, libjack/client.c declares the
 * actual storage.  Other source files will see it as an extern. */
#define JACK_TIME_GLOBAL_DECL double __jack_time_ratio
extern JACK_TIME_GLOBAL_DECL;

static inline jack_time_t 
jack_get_microseconds(void) 
{  
        return  mach_absolute_time () * __jack_time_ratio;
}

/* This should only be called ONCE per process. */
static inline void 
jack_init_time ()
{
        mach_timebase_info_data_t info; 
        mach_timebase_info(&info);
        __jack_time_ratio = ((float)info.numer/info.denom) / 1000;
}

#endif /* __jack_time_h__ */