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Support frontend-backend protocol communication using a shm_mq.

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A background worker can use pq_redirect_to_shm_mq() to direct protocol
that would normally be sent to the frontend to a shm_mq so that another
process may read them.

The receiving process may use pq_parse_errornotice() to parse an
ErrorResponse or NoticeResponse from the background worker and, if
it wishes, ThrowErrorData() to propagate the error (with or without
further modification).

Patch by me.  Review by Andres Freund.
This commit is contained in:
Robert Haas
2014-10-31 12:02:40 -04:00
parent 252e652ede
commit 2bd9e412f9
9 changed files with 428 additions and 47 deletions
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2
src/include/utils/builtins.h
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@@ -285,7 +285,7 @@ extern Datum current_schema(PG_FUNCTION_ARGS);
extern Datum current_schemas(PG_FUNCTION_ARGS);
/* numutils.c */
extern int32 pg_atoi(char *s, int size, int c);
extern int32 pg_atoi(const char *s, int size, int c);
extern void pg_itoa(int16 i, char *a);
extern void pg_ltoa(int32 l, char *a);
extern void pg_lltoa(int64 ll, char *a);