compiler/clib/clock.c

   1 /*
   2     Copyright © 1995-2003, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Returns time passed since start of program.
   6 */
   7
   8 #include "__arosc_privdata.h"
   9
  10 #include <dos/dos.h>
  11 #include <proto/dos.h>
  12 #include <aros/symbolsets.h>
  13
  14 /*****************************************************************************
  15
  16     NAME */
  17 #include <time.h>
  18
  19         clock_t clock (
  20
  21 /*  SYNOPSIS */
  22         void)
  23
  24 /*  FUNCTION
  25        clock() returns an approximation of the time passed since
  26        the program was started
  27
  28     INPUTS
  29
  30     RESULT
  31         The time passed in CLOCKS_PER_SEC units. To get the
  32         number of seconds divide by CLOCKS_PER_SEC.
  33
  34     NOTES
  35         This function must not be used in a shared library or
  36         in a threaded application.
  37
  38     EXAMPLE
  39
  40     BUGS
  41
  42     SEE ALSO
  43         time()
  44
  45     INTERNALS
  46
  47 ******************************************************************************/
  48 {
  49     struct DateStamp    t;
  50     clock_t             retval;
  51
  52     DateStamp (&t); /* Get timestamp */
  53
  54     /* Day difference */
  55     retval =  (t.ds_Days - __startup_datestamp.ds_Days);
  56
  57     /* Convert into minutes */
  58     retval *= (24 * 60);
  59
  60     /* Minute difference */
  61     retval += (t.ds_Minute - __startup_datestamp.ds_Minute);
  62
  63     /* Convert into CLOCKS_PER_SEC (which is the same as TICKS_PER_SECOND) units */
  64     retval *= (60 * TICKS_PER_SECOND);
  65
  66     /* Add tick difference */
  67     retval += (t.ds_Tick - __startup_datestamp.ds_Tick);
  68
  69     return retval;
  70
  71 } /* clock */
  72
  73 int __init_clock(void)
  74 {
  75     DateStamp(&__startup_datestamp);
  76     return 1;
  77 }
  78
  79 ADD2INIT(__init_clock, 20);