On Jan 22, 2005, at 1:14 PM, Reid Spencer wrote:
My "Newbie Question" of this past Thursday has gone unanswered.
That's weird...
Begin forwarded message:
From: Ben Hyde <[EMAIL PROTECTED]>
Date: January 21, 2005 2:48:10 PM EST
To: Reid Spencer <[EMAIL PROTECTED]>
Subject: Re: Using APR << Newbie Question
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Reid "Seriously in need of an APR tutorial" Spencer
You probably aren't unique in that regard :-)
I have an essay about pools around here someplace I really ought to
make more public.
Here's a simple example. Pools are used to provide a very very cheap
way to allocate
memory and an almost zero cost way to reclaim a batch of memory. So
they are used
to provide scratch storage for activities; when the activity is
finished the pool is cleared.
Or, they are used to provide all the storage for a large data
structure and when you want
to destroy the data structure you just destroy the pool and poof the
entire data structure
is reclaimed.
#include <stdlib.h>
#include <apr_pools.h>
#include <apr_uri.h>
/* Typically routines are handed a pool where they can
allocate memory willy nilly, their caller reclaims
all that memory from time to time.
*/
static void play_with_uri(apr_pool_t *p)
{
apr_uri_t uri;
apr_uri_parse(p, "http://example.com/foo.html",&uri);
printf(" Scheme: %s\n", uri.scheme);
printf(" Unparsed: %s\n", apr_uri_unparse(p, &uri, 0));
}
int main(int argc, char **argv)
{
apr_pool_t *process_pool; /* You always need one of these :-) */
apr_initialize();
atexit(apr_terminate);
apr_pool_create(&process_pool, NULL); /* No error handling in this
program! */
/* Create temporary pools for transient activities */
{
apr_pool_t *p;
apr_pool_create(&p, process_pool); /* temp pool */
play_with_uri(p);
apr_pool_destroy(p);
}
return 0;
}
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----
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tel:+1-781-240-2221 -- mobile, et.al.
