On Mon, 18 Jul 2005, Sudhanshu Prakash wrote:
> Hi *,
>
> I am using apr_* api's in my apache module and scenario is like as
> follows:
>
> 1) In init_module, I am creating one apr_global_mutex_t
> and registering a cleanup function which destroys the mutex.
init_module?
The following in a post_config hook works fine for me:
apr_global_mutex_create(&global_mutex, global_fname,
APR_LOCK_DEFAULT, pool) ;
unixd_set_global_mutex_perms(global_mutex) ;
apr_pool_cleanup_register(pool, global_mutex,
(void*)apr_global_mutex_destroy, apr_pool_cleanup_null) ;
>
> 2) In init_child, I am re-opening the same mutex using
> apr_global_mutex_child_init
Yep, that's right.
> 3) During Graceful restart, there is a race condition between mutex
> destruction and child-restart i.e. Mutex is destroyed first while old
> httpd childrens are still running and throws an error "(22), Invalid
> Argument". (This scenario is easy to replicate when http is pumped with
> high number of http requests and simultaneously i do graceful restart)
Hmmm, I haven't had that problem. You need to tell us what hook
you are referring to as init_module.
BTW, this would be more on-topic for the apache-modules list.
--
Nick Kew
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