ngx_hash_t - basic usage
mdounin at mdounin.ru
Fri Sep 6 12:05:29 UTC 2013
On Thu, Sep 05, 2013 at 12:00:39PM -0700, Michael Ellery wrote:
> I'm working on a module and I'd like to have a hash table to use across
> requests. I do, however, need to be able to both add and remove elements
> - does this implementation support removal?
It doesn't support removals (as well as additions after
ngx_hash_init() is called). It is meant to be created during
configuration parsing, and used without any further modifications.
Note well that ngx_hash_init() might be costly as it tries to find
an optimal hash table size.
> I'd appreciate any suggested examples to look at in the existing source
> to help get started with basic usage.
For very basic usage take a look at ngx_http_ssi_filter_module.c,
it uses hash to speed up lookups of SSI command names in a static
list. Tha hash is created in ngx_http_ssi_init_main_conf() and
then used by ngx_http_ssi_body_filter() to find a command.
More complete example can be found in ngx_http_map_module.c, as
the map module is essentially an interface to create hashes using
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