home *** CD-ROM | disk | FTP | other *** search
- /***********************************************************/
- /* */
- /* Amiga C Encyclopedia (ACE) V3.0 Amiga C Club (ACC) */
- /* ------------------------------- ------------------ */
- /* */
- /* Book: ACM System Amiga C Club */
- /* Chapter: Messages Tulevagen 22 */
- /* File: Example3.c 181 41 LIDINGO */
- /* Author: Anders Bjerin SWEDEN */
- /* Date: 92-05-02 */
- /* Version: 1.00 */
- /* */
- /* Copyright 1992, Anders Bjerin - Amiga C Club (ACC) */
- /* */
- /* Registered members may use this program freely in their */
- /* own commercial/noncommercial programs/articles. */
- /* */
- /***********************************************************/
-
- /* This program will open two ports. The first port is */
- /* used by the Timer Device while the second port will */
- /* not be used at all (it is a dummy port). The reason */
- /* why this example opens an extra port is because I */
- /* want to demonstrate how you can handle two message */
- /* ports simultaniously. With this technique you can */
- /* monitor up to 32 ports (the system usually needs */
- /* some singnals, but you have at least 16 signals for */
- /* yourself). */
-
-
-
- #include <exec/types.h> /* STRPTR */
- #include <exec/ports.h> /* struct Message */
- #include <exec/memory.h> /* MEMF_PUBLIC */
- #include <exec/nodes.h> /* NT_MESSAGE */
- #include <devices/timer.h> /* TIMERNAME */
-
-
-
- /* Declare two pointers to our message ports: */
- struct MsgPort *timerport, *dummyport;
- struct Message *msg;
-
-
-
- /* Timer Device: */
- struct timerequest *tr;
- BOOL error = TRUE;
-
-
-
- /* Declare the functions: */
- void clean_up();
- void main();
-
-
-
- void main()
- {
- /* We will store the port's signal bit values in these */
- /* variables: (Up to 32 bits, which is enough) */
- ULONG dummy_sig;
- ULONG timer_sig;
- ULONG received_sig;
-
-
-
- /* The dummy port: */
- /* Create a message port: (No name, priority 0) */
- dummyport = (struct MsgPort *) CreatePort( NULL, 0 );
-
- /* Check if we have successfully created the port: */
- if( !dummyport )
- clean_up( "Could not create the dummy port!" );
-
-
-
- /* The Timer Device's port: */
- /* Create a message port through which the system */
- /* will be able to communicate with us: */
- timerport = (struct MsgPort *)
- CreatePort( NULL, 0 );
-
- /* Check if we have successfully created a port: */
- if( !timerport )
- clean_up( "Could not create the timer port!" );
-
-
-
- /* Try to alloacte and initialize a timerequest */
- /* structure, to which we will send our requests to: */
- tr = (struct timerequest *)
- CreateExtIO( timerport, sizeof( struct timerequest) );
- /* Have we successfully created the timerequest structure? */
- if( !tr )
- clean_up( "Could not create the IO!" );
-
-
-
- /* Open the Timer Device: */
- error = OpenDevice( TIMERNAME, UNIT_VBLANK, tr ,0 );
- /* Have we successfully opened the device? */
- if( error )
- clean_up( "Could not open the Timer Device!" );
-
-
-
- /* Set our request: (Wait 10 seconds) */
- tr->tr_node.io_Command = TR_ADDREQUEST;
- tr->tr_time.tv_secs = 10;
- tr->tr_time.tv_micro = 0;
-
-
-
- /* Do our request and return immediately: */
- SendIO( tr );
-
-
-
- /* Get the ports signal values and transform them */
- /* into bit field signals: */
- dummy_sig = 1 << dummyport->mp_SigBit;
- timer_sig = 1 << timerport->mp_SigBit;
-
-
-
- /* Wait until we receive a message from either */
- /* the timer or dummy message port: */
- received_sig = Wait( dummy_sig | timer_sig );
-
-
-
- /* Check which message port sent the signal: */
- /* Was it the dummy port? */
- if( received_sig & dummy_sig )
- {
- printf( "The dummy message port! (Que?)\n" );
-
- /* Remove all messages: */
- while( msg = (struct Message *) GetMsg( dummyport ) )
- /* Do nothing... */;
- }
-
-
-
- /* Was it the timer port? */
- if( received_sig & timer_sig )
- {
- printf( "The timer message port!\n" );
-
- /* Remove all messages: */
- while( msg = (struct Message *) GetMsg( timerport ) )
- /* Do nothing... */;
- }
-
-
-
- /* Clean up and leave: */
- clean_up( "The End!" );
- }
-
-
-
- void clean_up( text )
- STRPTR text;
- {
- /* Close the Timer Device: */
- if( !error )
- CloseDevice( tr );
-
-
- /* Delete the timerequest structure: */
- if( tr )
- DeleteExtIO( tr, sizeof( struct timerequest) );
-
-
- /* Close the timer's message port: */
- if( timerport )
- DeletePort( timerport);
-
-
- /* Close the dummy message port: */
- if( dummyport )
- DeletePort( dummyport );
-
-
- /* Print the message: */
- printf( "%s\n", text );
-
-
- /* Quit: */
- exit( 0 );
- }
-
-