Help with apr mutex

[Simone Caruso]

Hi all,

I wrote a simple cache inside my module with apr_shm and apr_rmm, but I have 
problems with apr mutex...
I have this peace of code:

static apr_global_mutex_t *mtx = NULL;
static void module_translate_name(request_rec *r)
{
        if(apr_global_mutex_trylock(mtx) == APR_EBUSY)
                ap_log_rerror(APLOG_MARK, APLOG_WARNING|APLOG_NOERRNO, 0, r, "Memory 
Locked!! ");
        apr_global_mutex_lock(mtx);
        element = get_from_cache();
        if(element == NULL){
                element = insert_into_cache();
                strcpy(element.name,"name\0");
        }
        apr_global_mutex_unlock(mtx);
}

static void module_post_config(apr_pool_t *p, apr_pool_t *plog, apr_pool_t 
*ptemp, server_rec *s)
{
        result = apr_global_mutex_create(&mtx, "cache_entries_lck", 
APR_LOCK_DEFAULT, p);
}


static void mod_vhost_ldap_child_init(apr_pool_t * p, server_rec * s)
{
        apr_status_t ret;
        ret = apr_global_mutex_child_init(&mtx, "cache_entries_lck", p);
}



During my tests with 'ab -c 15 -n 3000' i NEVER get the "Memory Locked" error in logs, plus i get duplicated entries in 
cache but I don't know why!

Does someone have an idea? (please consider i use apr_global_mutex_trylock() 
only for test)
Regards.

--
Simone Caruso