Events: Difference between revisions
Content added Content deleted
m (→{{header|REXX}}: added/changed comments and whitespace, changed indentations.) |
|||
| Line 772: | Line 772: | ||
=={{header|REXX}}== |
=={{header|REXX}}== |
||
Although REXX can be event driven, most events would probably have to be actively checked to see if the event occurs. |
Although REXX can be event driven, most events would probably have to be actively checked to see if the event occurs. |
||
<br>Here is a time-driven example of events happening, based on specific timer ticks. |
<br>Here is a ''time-driven'' example of events happening, based on specific timer ticks. |
||
<lang rexx>/*REXX program |
<lang rexx>/*REXX program demonstrates a method of handling events (this is a time─driven pgm).*/ |
||
signal on halt /*allow the user to HALT the |
signal on halt /*allow the user to HALT the program.*/ |
||
parse arg timeEvent /*allow "event" to be specified. */ |
parse arg timeEvent /*allow the "event" to be specified. */ |
||
if timeEvent='' then timeEvent=5 /* |
if timeEvent='' then timeEvent=5 /*Not specified? Then use the default.*/ |
||
event?: do forever /*determine if an event occurred.*/ |
event?: do forever /*determine if an event has occurred. */ |
||
theEvent=right(time(),1) /*maybe it's an event, maybe not.*/ |
theEvent=right(time(),1) /*maybe it's an event, ─or─ maybe not.*/ |
||
if pos(theEvent,timeEvent)\==0 then signal happening |
if pos(theEvent,timeEvent)\==0 then signal happening |
||
end /*forever*/ |
end /*forever*/ |
||
say 'Control should never get here!' /*This is a logic |
say 'Control should never get here!' /*This is a logic can─never─happen ! */ |
||
halt: say 'program halted.'; exit |
halt: say '════════════ program halted.'; exit /*stick a fork in it, we're all done. */ |
||
/*──────────────────────────────────────────────────────────────────────────────────────*/ |
|||
/*───────────────────────────────────HAPPENING processing───────────────*/ |
|||
happening: |
happening: say 'an event occurred at' time()", the event is:" theEvent |
||
do while theEvent==right(time(),1) |
do while theEvent==right(time(),1) |
||
nop /*replace NOP with the "process" code.*/ |
|||
end /*while*/ /*NOP is a special REXX statement. */ |
|||
| ⚫ | |||
signal event? /*see if another event has happened. */</lang> |
|||
| ⚫ | |||
<pre> |
<pre> |
||
an event occurred at 16:13:29, the event is: 9 |
an event occurred at 16:13:29, the event is: 9 |
||
| Line 807: | Line 809: | ||
an event occurred at 16:13:51, the event is: 1 |
an event occurred at 16:13:51, the event is: 1 |
||
an event occurred at 16:13:53, the event is: 3 |
an event occurred at 16:13:53, the event is: 3 |
||
program halted. |
════════════ program halted. |
||
</pre> |
</pre> |
||