src/rx/rx_clock_nt.c

   1 /*
   2  * Copyright 2000, International Business Machines Corporation and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 /* Elapsed time package */
  11 /* See rx_clock.h for calling conventions */
  12
  13 #include <afsconfig.h>
  14 #include <afs/param.h>
  15
  16 #include <roken.h>
  17
  18 #ifdef AFS_NT40_ENV
  19 #include <windef.h>
  20 #include <winbase.h>
  21 #include "rx_clock.h"
  22
  23 struct clock clock_now;         /* The last elapsed time ready by clock_GetTimer */
  24
  25 /* This is set to 1 whenever the time is read, and reset to 0 whenever
  26  * clock_NewTime is called.  This is to allow the caller to control the
  27  * frequency with which the actual time is re-evaluated.
  28  */
  29 #undef clock_haveCurrentTime
  30 int clock_haveCurrentTime = 0;
  31
  32 int clock_nUpdates;             /* The actual number of clock updates */
  33 static int clockInitialized = 0;
  34
  35 /* Timing tests show that we can compute times at about 4uS per call. */
  36 LARGE_INTEGER rxi_clock0;
  37 LARGE_INTEGER rxi_clockFreq;
  38
  39 #undef clock_UpdateTime
  40 void clock_UpdateTime(void);
  41
  42 #undef clock_Init
  43 void
  44 clock_Init(void)
  45 {
  46     if (!QueryPerformanceFrequency(&rxi_clockFreq)) {
  47         OutputDebugString("No High Performance clock, exiting.\n");
  48         exit(1);
  49     }
  50     clockInitialized = 1;
  51
  52     clock_UpdateTime();
  53 }
  54
  55 #ifndef KERNEL
  56 /* Make clock uninitialized. */
  57 int
  58 clock_UnInit(void)
  59 {
  60     clockInitialized = 0;
  61     return 0;
  62 }
  63 #endif
  64
  65 void
  66 clock_UpdateTime(void)
  67 {
  68     LARGE_INTEGER now, delta;
  69     double seconds;
  70
  71     (void)QueryPerformanceCounter(&now);
  72
  73     delta.QuadPart = now.QuadPart - rxi_clock0.QuadPart;
  74
  75     seconds = (double)delta.QuadPart / (double)rxi_clockFreq.QuadPart;
  76
  77     clock_now.sec = (int)seconds;
  78     clock_now.usec = (int)((seconds - (double)clock_now.sec)
  79                            * (double)1000000);
  80     clock_haveCurrentTime = 1;
  81     clock_nUpdates++;
  82
  83 }
  84 #endif /* AFS_NT40_ENV */