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- ;/* signals.c - Execute me to compile me with SAS C 5.10
- LC -b1 -cfistq -v -y -j73 signals.c
- Blink FROM LIB:c.o,signals.o TO signals LIBRARY LIB:LC.lib,LIB:Amiga.lib
- quit ;
-
-
- Copyright (c) 1992-1999 Amiga, Inc.
-
- This example is provided in electronic form by Amiga, Inc. for
- use with the "Amiga ROM Kernel Reference Manual: Libraries", 3rd Edition,
- published by Addison-Wesley (ISBN 0-201-56774-1).
-
- The "Amiga ROM Kernel Reference Manual: Libraries" contains additional
- information on the correct usage of the techniques and operating system
- functions presented in these examples. The source and executable code
- of these examples may only be distributed in free electronic form, via
- bulletin board or as part of a fully non-commercial and freely
- redistributable diskette. Both the source and executable code (including
- comments) must be included, without modification, in any copy. This
- example may not be published in printed form or distributed with any
- commercial product. However, the programming techniques and support
- routines set forth in these examples may be used in the development
- of original executable software products for Amiga computers.
-
- All other rights reserved.
-
- This example is provided "as-is" and is subject to change; no
- warranties are made. All use is at your own risk. No liability or
- responsibility is assumed.
- */
-
- #include <exec/types.h>
- #include <exec/memory.h>
- #include <dos/dos.h>
-
- #include <clib/exec_protos.h>
- #include <clib/dos_protos.h>
- #include <clib/alib_protos.h>
- #include "stdio.h"
-
- #ifdef LATTICE
- int CXBRK(void) { return(0); } /* Disable Lattice CTRL/C handling */
- int chkabort(void) { return(0); } /* really */
- #endif
-
- static UBYTE *VersTag = "$VER: signals 37.1 (28.3.91)";
-
- void subtaskcode(void); /* prototype for our subtask routine */
-
- LONG mainsignum = -1;
- ULONG mainsig, wakeupsigs;
- struct Task *maintask = NULL, *subtask = NULL;
- UBYTE subtaskname[] = "RKM_signal_subtask";
-
- void main(int argc, char **argv)
- {
- BOOL Done = FALSE, WaitingForSubtask = TRUE;
-
- /* We must allocate any special signals we want to receive. */
- mainsignum = AllocSignal(-1);
- if(mainsignum == -1)
- printf("No signals available\n");
- else
- {
- mainsig = 1L << mainsignum; /* subtask can access this global */
- maintask = FindTask(NULL); /* subtask can access this global */
-
- printf("We alloc a signal, create a task, wait for signals\n");
- subtask = CreateTask(subtaskname, 0L, subtaskcode, 2000);
- if(!subtask)
- printf("Can't create subtask\n");
- else
- {
- printf("After subtask signals, press CTRL-C or CTRL-D to exit\n");
-
- while((!Done)||(WaitingForSubtask))
- {
- /* Wait on the combined mask for all of the signals we are
- * interested in. All processes have the CTRL_C thru CTRL_F
- * signals. We're also Waiting on the mainsig we allocated
- * for our subtask to signal us with. We could also Wait on
- * the signals of any ports/windows our main task created ... */
-
- wakeupsigs = Wait(mainsig | SIGBREAKF_CTRL_C | SIGBREAKF_CTRL_D);
-
- /* Deal with all signals that woke us up - may be more than one */
- if(wakeupsigs & mainsig)
- {
- printf("Signalled by subtask\n");
- WaitingForSubtask = FALSE; /* OK to kill subtask now */
- }
- if(wakeupsigs & SIGBREAKF_CTRL_C)
- {
- printf("Got CTRL-C signal\n");
- Done = TRUE;
- }
- if(wakeupsigs & SIGBREAKF_CTRL_D)
- {
- printf("Got CTRL-D signal\n");
- Done = TRUE;
- }
- }
- Forbid();
- DeleteTask(subtask);
- Permit();
- }
- FreeSignal(mainsignum);
- }
- }
-
- void subtaskcode(void)
- {
- Signal(maintask,mainsig);
- Wait(0L); /* safe state in which this subtask can be deleted */
- }