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Revert r1831218, the API garantees slotmem_attach() is called in child_init().

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r1831394 is the right follow to r1830800 to preserve "inherited" slotmems in
children processes.

While at it, comment on the expectations from mod_proxy_balancer w.r.t.
slotmem_attach() implementations, and eventually how we could improve the API
later (w/o backporting to 2.4.x).



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1831396 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Yann Ylavic
2018-05-11 09:44:38 +00:00
parent eb353ffa5d
commit 76418da90b
1 changed files with 15 additions and 3 deletions
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18
modules/proxy/mod_proxy_balancer.c
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@ -1885,14 +1885,26 @@ static void balancer_child_init(apr_pool_t *p, server_rec *s)
proxy_server_conf *conf = (proxy_server_conf *)ap_get_module_config(sconf, &proxy_module);
apr_status_t rv;
if (conf->balancers->nelts && !conf->bslot) {
if (conf->balancers->nelts) {
apr_size_t size;
unsigned int num;
storage->attach(&(conf->bslot), conf->id, &size, &num, p);
/* In 2.4.x we rely on the provider to return either the same
* in/out &bslot, a valid new one, or NULL for failure/exit().
* TODO? for 2.6+/3.x we possibly could consider returned status
* to be real failures, but e.g. NOTFOUND/ENOSHM* to continue with
* existing conf->bslot (even when the returned one is NULL).
* Hence handle the slotmem reuse it here where we know it's valid
* both for fork()ed post_config()s and MPM winnt-like ones (run in
* child process too). The provider tells what it attached or not,
* and if not whether the child should stop (fatal) or continue
* with the "inherited" configuration.
*/
rv = storage->attach(&conf->bslot, conf->id, &size, &num, p);
if (!conf->bslot) {
ap_log_error(APLOG_MARK, APLOG_EMERG, 0, s, APLOGNO(01205) "slotmem_attach failed");
ap_log_error(APLOG_MARK, APLOG_EMERG, rv, s, APLOGNO(01205) "slotmem_attach failed");
exit(1); /* Ugly, but what else? */
}
(void)rv;
}
balancer = (proxy_balancer *)conf->balancers->elts;