src/lwp/test/test.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 #include <afsconfig.h>
  11 #include <afs/param.h>
  12
  13
  14 #include <stdio.h>
  15 #include <sys/time.h>
  16 #include "lwp.h"
  17
  18 char semaphore;
  19
  20 int
  21 OtherProcess()
  22 {
  23     for (;;) {
  24         LWP_SignalProcess(&semaphore);
  25     }
  26 }
  27
  28 main(argc, argv)
  29      int argc;
  30      char *argv[];
  31 {
  32     struct timeval t1, t2;
  33     int pid, otherpid;
  34     int i, count, x;
  35     char *waitarray[2];
  36     static char c[] = "OtherProcess";
  37
  38     count = atoi(argv[1]);
  39
  40     assert(LWP_InitializeProcessSupport(0, (PROCESS *) & pid) == LWP_SUCCESS);
  41     assert(LWP_CreateProcess
  42            (OtherProcess, 4096, 0, 0, c,
  43             (PROCESS *) & otherpid) == LWP_SUCCESS);
  44
  45     waitarray[0] = &semaphore;
  46     waitarray[1] = 0;
  47     gettimeofday(&t1, NULL);
  48     for (i = 0; i < count; i++) {
  49         LWP_MwaitProcess(1, waitarray, 1);
  50     }
  51     gettimeofday(&t2, NULL);
  52
  53     x = (t2.tv_sec - t1.tv_sec) * 1000000 + (t2.tv_usec - t1.tv_usec);
  54     printf("%d milliseconds for %d MWaits (%f usec per Mwait and Signal)\n",
  55            x / 1000, count, (float)(x / count));
  56 }