workbench/demos/multiple_timers.c

   1 /*
   2  * Copyright (c) 1992 Commodore-Amiga, Inc.
   3  *
   4  * This example is provided in electronic form by Commodore-Amiga, Inc. for
   5  * use with the "Amiga ROM Kernel Reference Manual: Devices", 3rd Edition,
   6  * published by Addison-Wesley (ISBN 0-201-56775-X).
   7  *
   8  * The "Amiga ROM Kernel Reference Manual: Devices" contains additional
   9  * information on the correct usage of the techniques and operating system
  10  * functions presented in these examples.  The source and executable code
  11  * of these examples may only be distributed in free electronic form, via
  12  * bulletin board or as part of a fully non-commercial and freely
  13  * redistributable diskette.  Both the source and executable code (including
  14  * comments) must be included, without modification, in any copy.  This
  15  * example may not be published in printed form or distributed with any
  16  * commercial product.  However, the programming techniques and support
  17  * routines set forth in these examples may be used in the development
  18  * of original executable software products for Commodore Amiga computers.
  19  *
  20  * All other rights reserved.
  21  *
  22  * This example is provided "as-is" and is subject to change; no
  23  * warranties are made.  All use is at your own risk. No liability or
  24  * responsibility is assumed.
  25  *
  26  *****************************************************************************
  27  *
  28  *  Multiple_Timers.c
  29  *
  30  *  This program is designed to do multiple (3) time requests using one
  31  *  OpenDevice.  It creates a message port - TimerMP, creates an
  32  *  extended I/O structure of type timerequest named TimerIO[0] and
  33  *  then uses that to open the device.  The other two time request
  34  *  structures - TimerIO[1] and TimerIO[2] - are created using AllocMem
  35  *  and then copying TimerIO[0] into them.  The tv_secs field of each
  36  *  structure is set and then three SendIOs are done with the requests.
  37  *  The program then goes into a while loop until all messages are received.
  38  *
  39  * Compile with SAS C 5.10  lc -b1 -cfistq -v -y -L
  40  *
  41  * Run from CLI only
  42  */
  43
  44 #include <exec/types.h>
  45 #include <exec/memory.h>
  46 #include <devices/timer.h>
  47
  48 #include <proto/exec.h>
  49 #include <clib/alib_protos.h>
  50
  51 #include <stdio.h>
  52
  53 #ifdef LATTICE
  54 int CXBRK(void) { return(0); }  /* Disable Lattice CTRL/C handling */
  55 int chkabort(void) { return(0); }  /* really */
  56 #endif
  57
  58 int main(void)
  59 {
  60 struct timerequest *TimerIO[3];
  61 struct MsgPort *TimerMP;
  62 struct Message *TimerMSG;
  63
  64 ULONG error,x,seconds[3]={4,1,2}, microseconds[3]={0,0,0};
  65
  66 int allin = 3;
  67 char *position[]={"last","second","first"};
  68
  69 if ((TimerMP = CreatePort(0,0)))
  70     {
  71     if ((TimerIO[0] = (struct timerequest *)
  72                       CreateExtIO(TimerMP,sizeof(struct timerequest))))
  73         {
  74             /* Open the device once */
  75         if (!(error=OpenDevice( TIMERNAME, UNIT_VBLANK,(struct IORequest *) TimerIO[0], 0L)))
  76             {
  77             /* Set command to TR_ADDREQUEST */
  78             TimerIO[0]->tr_node.io_Command = TR_ADDREQUEST;
  79
  80             if ((TimerIO[1]=(struct timerequest *)
  81                     AllocMem(sizeof(struct timerequest),MEMF_PUBLIC | MEMF_CLEAR)))
  82                 {
  83                 if ((TimerIO[2]=(struct timerequest *)
  84                        AllocMem(sizeof(struct timerequest),MEMF_PUBLIC | MEMF_CLEAR)))
  85                     {
  86                     /* Copy fields from the request used to open the timer device */
  87                     *TimerIO[1] = *TimerIO[0];
  88                     *TimerIO[2] = *TimerIO[0];
  89
  90                     /* Initialize other fields */
  91                     for (x=0;x<3;x++)
  92                         {
  93                         TimerIO[x]->tr_time.tv_secs   = seconds[x];
  94                         TimerIO[x]->tr_time.tv_micro  = microseconds[x];
  95                         printf("\nInitializing TimerIO[%ld]",(long)x);
  96                         }
  97
  98                     printf("\n\nSending multiple requests\n\n");
  99
 100                     /* Send multiple requests asynchronously */
 101                     /* Do not got to sleep yet...            */
 102                     SendIO((struct IORequest *)TimerIO[0]);
 103                     SendIO((struct IORequest *)TimerIO[1]);
 104                     SendIO((struct IORequest *)TimerIO[2]);
 105
 106                     /* There might be other processing done here */
 107
 108                     /* Now go to sleep with WaitPort() waiting for the requests */
 109                     while (allin)
 110                           {
 111                           WaitPort(TimerMP);
 112                           /* Get the reply message */
 113                           TimerMSG=GetMsg(TimerMP);
 114                           for (x=0;x<3;x++)
 115                               if (TimerMSG==(struct Message *)TimerIO[x])
 116                                   printf("Request %ld finished %s\n",(long)x,position[--allin]);
 117                           }
 118
 119                     FreeMem(TimerIO[2],sizeof(struct timerequest));
 120                     }
 121
 122                 else
 123                     printf("Error: could not allocate TimerIO[2] memory\n");
 124
 125                 FreeMem(TimerIO[1],sizeof(struct timerequest));
 126                 }
 127
 128             else
 129                 printf("Error could not allocate TimerIO[1] memory\n");
 130
 131             CloseDevice((struct IORequest *) TimerIO[0]);
 132             }
 133
 134         else
 135             printf("\nError: Could not OpenDevice\n");
 136
 137         DeleteExtIO((struct IORequest *) TimerIO[0]);
 138         }
 139
 140     else
 141         printf("Error: could not create IORequest\n");
 142
 143     DeletePort(TimerMP);
 144     }
 145
 146 else
 147     printf("\nError: Could not CreatePort\n");
 148
 149 return 0;
 150 }