Re: Manipulating C code at the AST level, in C

On Fri, 14 Aug 2026 23:47:19 -0400, c186282 wrote:

   Polling, for this sort of thing, has to be
   fast and constant - a big CPU drag. You are
   basically WAITING for something to happen -
   which MAY or may NOT happen at any moment.

I used select() rather than poll() but I'm archaic. Typically the select
call was in the main loop. The timeout was often 1 second. If the call
returned a ready fd you took care of business. If it timed out, then you
did whatever housekeeping was necessary, making sure it wasn't a long
process.

Without the select the main loop would chew up 100% of the CPU. Interrupt
have their place but often complex ISRs are used that aren't any faster
than polling.

Date	Sujet	#		Auteur
14 Aug 26	Re: Manipulating C code at the AST level, in C	74		Nuno Silva
14 Aug 26	Re: Manipulating C code at the AST level, in C	2		Geoff Clare
14 Aug22:10	Re: Manipulating C code at the AST level, in C	1		Lawrence D’Oliveiro
15 Aug04:47	Re: Manipulating C code at the AST level, in C	71		c186282
15 Aug08:20	Re: Manipulating C code at the AST level, in C	5		rbowman
15 Aug11:33	Re: Manipulating C code at the AST level, in C	1		The Natural Philosopher
16 Aug03:41	Re: Manipulating C code at the AST level, in C	3		c186282
16 Aug09:50	Re: Manipulating C code at the AST level, in C	2		Carlos E. R.
16 Aug20:04	Re: Manipulating C code at the AST level, in C	1		rbowman
15 Aug12:07	Re: Manipulating C code at the AST level, in C	2		Jim Jackson
15 Aug12:18	Re: Manipulating C code at the AST level, in C	1		The Natural Philosopher
15 Aug12:20	Re: Manipulating C code at the AST level, in C	63		Richard Kettlewell
16 Aug09:59	Re: Manipulating C code at the AST level, in C	55		Richard Kettlewell
16 Aug11:42	Re: Manipulating C code at the AST level, in C	54		The Natural Philosopher
17 Aug05:02	Re: Manipulating C code at the AST level, in C	53		c186282
17 Aug08:10	Re: Manipulating C code at the AST level, in C	52		rbowman
17 Aug09:32	Re: Manipulating C code at the AST level, in C	1		Nuno Silva
17 Aug10:13	Re: Manipulating C code at the AST level, in C	50		The Natural Philosopher
17 Aug18:15	Re: Manipulating C code at the AST level, in C	2		rbowman
17 Aug20:58	Re: Manipulating C code at the AST level, in C	1		The Natural Philosopher
18 Aug03:24	Re: Manipulating C code at the AST level, in C	47		c186282
18 Aug07:17	Re: Manipulating C code at the AST level, in C	8		rbowman
19 Aug03:11	Re: Manipulating C code at the AST level, in C	7		c186282
19 Aug05:21	Re: Manipulating C code at the AST level, in C	5		rbowman
19 Aug07:26	Re: Manipulating C code at the AST level, in C	3		c186282
19 Aug14:29	Re: Manipulating C code at the AST level, in C	2		The Natural Philosopher
19 Aug20:36	Re: Manipulating C code at the AST level, in C	1		rbowman
19 Aug14:28	Re: Manipulating C code at the AST level, in C	1		The Natural Philosopher
19 Aug14:24	Re: Manipulating C code at the AST level, in C	1		The Natural Philosopher
18 Aug10:19	Re: Manipulating C code at the AST level, in C	38		The Natural Philosopher
19 Aug05:11	Re: Manipulating C code at the AST level, in C	26		rbowman
19 Aug05:38	Re: Manipulating C code at the AST level, in C	16		Lawrence D’Oliveiro
19 Aug07:35	Re: Manipulating C code at the AST level, in C	6		rbowman
19 Aug14:31	Re: Manipulating C code at the AST level, in C	5		The Natural Philosopher
19 Aug20:47	Re: Manipulating C code at the AST level, in C	4		rbowman
20 Aug14:04	[off-topic] MA 370 flight disappearance (Was: Re: Manipulating C code at the AST level, in C)	3		Anton Antimo
20 Aug22:11	Re: [off-topic] MA 370 flight disappearance (Was: Re: Manipulating C code at the AST level, in C)	1		rbowman
21 Aug13:32	Re: [off-topic] MA 370 flight disappearance	1		The Natural Philosopher
19 Aug07:39	Re: Manipulating C code at the AST level, in C	1		rbowman
19 Aug08:04	Re: Manipulating C code at the AST level, in C	8		Lawrence D’Oliveiro
19 Aug20:59	Re: Manipulating C code at the AST level, in C	7		rbowman
20 Aug01:31	Re: Manipulating C code at the AST level, in C	6		The Natural Philosopher
20 Aug04:26	Re: Manipulating C code at the AST level, in C	5		rbowman
20 Aug11:50	Re: Manipulating C code at the AST level, in C	4		The Natural Philosopher
20 Aug12:06	Re: Manipulating C code at the AST level, in C	1		The Natural Philosopher
20 Aug17:51	Re: Manipulating C code at the AST level, in C	2		c186282
21 Aug13:34	Re: Manipulating C code at the AST level, in C	1		The Natural Philosopher
19 Aug07:30	Re: Manipulating C code at the AST level, in C	1		rbowman
19 Aug23:17	Re: Manipulating C code at the AST level, in C	8		rbowman
20 Aug01:34	Re: Manipulating C code at the AST level, in C	2		The Natural Philosopher
20 Aug04:45	Re: Manipulating C code at the AST level, in C	1		rbowman
20 Aug04:26	Re: Manipulating C code at the AST level, in C	5		c186282
20 Aug22:40	Re: Manipulating C code at the AST level, in C	4		rbowman
21 Aug04:42	Re: Manipulating C code at the AST level, in C	3		c186282
21 Aug07:10	Re: Manipulating C code at the AST level, in C	2		rbowman
21 Aug14:01	Re: Manipulating C code at the AST level, in C	1		Lars Poulsen
19 Aug14:15	Re: Manipulating C code at the AST level, in C	11		The Natural Philosopher
19 Aug20:39	Re: Manipulating C code at the AST level, in C	10		rbowman
20 Aug01:25	Re: Manipulating C code at the AST level, in C	8		The Natural Philosopher
20 Aug04:56	Re: Manipulating C code at the AST level, in C	7		rbowman
20 Aug05:46	Re: Manipulating C code at the AST level, in C	2		Lawrence D’Oliveiro
20 Aug05:59	Re: Manipulating C code at the AST level, in C	1		Lawrence D’Oliveiro
20 Aug22:46	Re: Manipulating C code at the AST level, in C	4		rbowman
21 Aug05:05	Re: Manipulating C code at the AST level, in C	1		c186282
21 Aug05:35	Re: Manipulating C code at the AST level, in C	1		rbowman
21 Aug05:54	Re: Manipulating C code at the AST level, in C	1		c186282
20 Aug05:03	Re: Manipulating C code at the AST level, in C	1		rbowman
16 Aug20:13	Re: Manipulating C code at the AST level, in C	2		rbowman
17 Aug06:14	Re: Manipulating C code at the AST level, in C	1		c186282
17 Aug13:44	Re: Manipulating C code at the AST level, in C	5		Geoff Clare
17 Aug15:31	Re: Manipulating C code at the AST level, in C	3		The Natural Philosopher
18 Aug13:23	Re: Manipulating C code at the AST level, in C	2		Geoff Clare
18 Aug17:16	Re: Manipulating C code at the AST level, in C	1		The Natural Philosopher
17 Aug20:27	Re: Manipulating C code at the AST level, in C	1		Richard Kettlewell

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