iconv: Use __twalk_r in __gconv_release_shlib

  2019-05-02  Florian Weimer  <fweimer@redhat.com>

	* iconv/gconv_dl.c (release_handle): Remove file-level definition.
	(do_release_shlib): Adjust for __twalk_r.
	(__gconv_release_shlib): Call __twalk_r.
  

* Florian Weimer:

> 2019-05-02  Florian Weimer  <fweimer@redhat.com>
>
> 	* iconv/gconv_dl.c (release_handle): Remove file-level definition.
> 	(do_release_shlib): Adjust for __twalk_r.
> 	(__gconv_release_shlib): Call __twalk_r.
>
> diff --git a/iconv/gconv_dl.c b/iconv/gconv_dl.c
> index cf7023a9aa..8379a488ed 100644
> --- a/iconv/gconv_dl.c
> +++ b/iconv/gconv_dl.c
> @@ -149,15 +149,11 @@ __gconv_find_shlib (const char *name)
>    return found;
>  }
>  
> -
> -/* This is very ugly but the tsearch functions provide no way to pass
> -   information to the walker function.  So we use a global variable.
> -   It is MT safe since we use a lock.  */
> -static struct __gconv_loaded_object *release_handle;
> -
>  static void
> -do_release_shlib (void *nodep, VISIT value, int level)
> +do_release_shlib (const void *nodep, VISIT value, void *closure)
>  {
> +
> +  struct __gconv_loaded_object *release_handle = closure;
>    struct __gconv_loaded_object *obj = *(struct __gconv_loaded_object **) nodep;
>  
>    if (value != preorder && value != leaf)
> @@ -184,13 +180,10 @@ do_release_shlib (void *nodep, VISIT value, int level)
>  void
>  __gconv_release_shlib (struct __gconv_loaded_object *handle)
>  {
> -  /* Urgh, this is ugly but we have no other possibility.  */
> -  release_handle = handle;
> -
>    /* Process all entries.  Please note that we also visit entries
>       with release counts <= 0.  This way we can finally unload them
>       if necessary.  */
> -  __twalk (loaded, (__action_fn_t) do_release_shlib);
> +  __twalk_r (loaded, do_release_shlib, handle);
>  }

Ping?  This gets rid of “very ugly” code (their words, not mine).

Thanks,
Florian
  

On Mai 02 2019, Florian Weimer <fweimer@redhat.com> wrote:

> 	* iconv/gconv_dl.c (release_handle): Remove file-level definition.
> 	(do_release_shlib): Adjust for __twalk_r.
> 	(__gconv_release_shlib): Call __twalk_r.

Ok.

> diff --git a/iconv/gconv_dl.c b/iconv/gconv_dl.c
> index cf7023a9aa..8379a488ed 100644
> --- a/iconv/gconv_dl.c
> +++ b/iconv/gconv_dl.c
> @@ -149,15 +149,11 @@ __gconv_find_shlib (const char *name)
>    return found;
>  }
>  
> -
> -/* This is very ugly but the tsearch functions provide no way to pass
> -   information to the walker function.  So we use a global variable.
> -   It is MT safe since we use a lock.  */
> -static struct __gconv_loaded_object *release_handle;
> -
>  static void
> -do_release_shlib (void *nodep, VISIT value, int level)
> +do_release_shlib (const void *nodep, VISIT value, void *closure)
>  {
> +
> +  struct __gconv_loaded_object *release_handle = closure;

Extra empty line.

Andreas.
  

* Andreas Schwab:

> On Mai 02 2019, Florian Weimer <fweimer@redhat.com> wrote:
>
>> 	* iconv/gconv_dl.c (release_handle): Remove file-level definition.
>> 	(do_release_shlib): Adjust for __twalk_r.
>> 	(__gconv_release_shlib): Call __twalk_r.
>
> Ok.
>
>> diff --git a/iconv/gconv_dl.c b/iconv/gconv_dl.c
>> index cf7023a9aa..8379a488ed 100644
>> --- a/iconv/gconv_dl.c
>> +++ b/iconv/gconv_dl.c
>> @@ -149,15 +149,11 @@ __gconv_find_shlib (const char *name)
>>    return found;
>>  }
>>  
>> -
>> -/* This is very ugly but the tsearch functions provide no way to pass
>> -   information to the walker function.  So we use a global variable.
>> -   It is MT safe since we use a lock.  */
>> -static struct __gconv_loaded_object *release_handle;
>> -
>>  static void
>> -do_release_shlib (void *nodep, VISIT value, int level)
>> +do_release_shlib (const void *nodep, VISIT value, void *closure)
>>  {
>> +
>> +  struct __gconv_loaded_object *release_handle = closure;
>
> Extra empty line.

Thanks, pushed with that change.

Florian