Events: Difference between revisions
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m (→{{header|REXX}}: added/changed whitespace and comments, aligned statements, used a template for the output section.) |
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<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. |
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<lang rexx>/*REXX program demonstrates a method of handling events (this is a time─driven pgm).*/ |
<lang rexx>/*REXX program demonstrates a method of handling events (this is a time─driven pgm).*/ |
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signal on halt /*allow |
signal on halt /*allow user to HALT (Break) the pgm.*/ |
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parse arg timeEvent /*allow the "event" to be specified. */ |
parse arg timeEvent /*allow the "event" to be specified. */ |
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if timeEvent='' then timeEvent= |
if timeEvent='' then timeEvent= 5 /*Not specified? Then use the default.*/ |
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event?: do forever /*determine if an event has occurred. */ |
event?: do forever /*determine if an event has occurred. */ |
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theEvent=right(time(),1) |
theEvent= right(time(), 1) /*maybe it's an event, ─or─ maybe not.*/ |
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if pos(theEvent,timeEvent) |
if pos(theEvent, timeEvent)>0 then signal happening |
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end /*forever*/ |
end /*forever*/ |
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say 'Control should never get here!' /*This is a logic can─never─happen ! */ |
say 'Control should never get here!' /*This is a logic can─never─happen ! */ |
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halt: say '════════════ program halted.'; |
halt: say '════════════ program halted.'; exit 0 /*stick a fork in it, we're all done. */ |
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/*──────────────────────────────────────────────────────────────────────────────────────*/ |
/*──────────────────────────────────────────────────────────────────────────────────────*/ |
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happening: say 'an event occurred at' time()", the event is:" theEvent |
happening: say 'an event occurred at' time()", the event is:" theEvent |
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do |
do while theEvent==right(time(), 1) /*spin until a tic (a second) changes. */ |
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nop /*replace NOP with the "process" code.*/ |
nop /*replace NOP with the "process" code.*/ |
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end /*while*/ /*NOP |
end /*while*/ /*NOP is a REXX statement, does nothing*/ |
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signal event? /*see if another event has happened. */</lang> |
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{{out|output|text= when using the input of: <tt> 1 3 5 0 7 9 </tt>}} |
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<pre> |
<pre> |
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an event occurred at 16:13:29, the event is: 9 |
an event occurred at 16:13:29, the event is: 9 |
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