Re: pgsql: Add new function dsa_allocate0.

On Fri, Feb 17, 2017 at 12:03 PM, Thomas Munro
<thomas.munro@enterprisedb.com> wrote:
> On Fri, Feb 17, 2017 at 11:34 AM, Thomas Munro
> <thomas.munro@enterprisedb.com> wrote:
>> On Fri, Feb 17, 2017 at 7:02 AM, Robert Haas <rhaas@postgresql.org> wrote:
>>> http://git.postgresql.org/pg/commitdiff/9acb85597f1223ac26a5b19a9345849c43d0ff54
>> Hmm.  This will segfault if you're out of memory.
>
> Or to provide a more useful response... maybe this should be like the
> attached?  Or maybe people think that dsa_allocate should throw on
> failure to allocate, like palloc?

     dp = dsa_allocate(area, size);
-    object = dsa_get_address(area, dp);
-    memset(object, 0, size);
+    if (DsaPointerIsValid(dp))
+        memset(dsa_get_address(area, dp), 0, size);
What you are proposing here looks like the right answer to me. Like
dsa_allocate, dsa_allocate0 should allow users to fallback to other
methods if what is returned is InvalidDsaPointer for consistency.
-- 
Michael