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Add missing PGDLLEXPORT markings in contrib/pg_prewarm.

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After commit 089480c07, it's necessary for background worker entry
points to be marked PGDLLEXPORT, else they aren't findable by
LookupBackgroundWorkerFunction().  Since pg_prewarm lacks any
regression tests, it's not surprising its worker entry points were
overlooked.  (A quick search turned up no other such oversights.)

I added some documentation pointing out the need for this, too.

Robins Tharakan and Tom Lane

CAEP4nAzndnQv3-1QKb=D-hLoK3Rko12HHMFHHtdj2GQAUXO3gw@mail.gmail.com
This commit is contained in:
Tom Lane
2022-07-27 12:00:10 -04:00
parent a2e97cb2b6
commit 03361a368e
2 changed files with 8 additions and 7 deletions
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4
contrib/pg_prewarm/autoprewarm.c
View File

@ -82,8 +82,8 @@ typedef struct AutoPrewarmSharedState
int prewarmed_blocks;
} AutoPrewarmSharedState;
void autoprewarm_main(Datum main_arg);
void autoprewarm_database_main(Datum main_arg);
PGDLLEXPORT void autoprewarm_main(Datum main_arg);
PGDLLEXPORT void autoprewarm_database_main(Datum main_arg);
PG_FUNCTION_INFO_V1(autoprewarm_start_worker);
PG_FUNCTION_INFO_V1(autoprewarm_dump_now);

11
doc/src/sgml/bgworker.sgml
View File

@ -141,14 +141,15 @@ typedef struct BackgroundWorker
which the initial entry point for the background worker should be sought.
The named library will be dynamically loaded by the worker process and
<structfield>bgw_function_name</structfield> will be used to identify the
function to be called. If loading a function from the core code, this must
be set to "postgres".
function to be called. If calling a function in the core code, this must
be set to <literal>"postgres"</literal>.
</para>
<para>
<structfield>bgw_function_name</structfield> is the name of a function in
a dynamically loaded library which should be used as the initial entry point
for a new background worker.
<structfield>bgw_function_name</structfield> is the name of the function
to use as the initial entry point for the new background worker. If
this function is in a dynamically loaded library, it must be marked
<literal>PGDLLEXPORT</literal> (and not <literal>static</literal>).
</para>
<para>