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| author | Andres Freund <andres@anarazel.de> | 2017-09-14 19:59:21 -0700 |
|---|---|---|
| committer | Andres Freund <andres@anarazel.de> | 2017-09-14 19:59:21 -0700 |
| commit | cc5f81366c36b3dd8f02bd9be1cf75b2cc8482bd (patch) | |
| tree | 8670bbca7404426515b5556ab2c6477b316e3edc /src/backend/utils/init/postinit.c | |
| parent | 9b6cb4650bc6a56114000678c1944afdb95f8333 (diff) | |
| download | postgresql-cc5f81366c36b3dd8f02bd9be1cf75b2cc8482bd.tar.gz postgresql-cc5f81366c36b3dd8f02bd9be1cf75b2cc8482bd.zip | |
Add support for coordinating record typmods among parallel workers.
Tuples can have type RECORDOID and a typmod number that identifies a blessed
TupleDesc in a backend-private cache. To support the sharing of such tuples
through shared memory and temporary files, provide a typmod registry in
shared memory.
To achieve that, introduce per-session DSM segments, created on demand when a
backend first runs a parallel query. The per-session DSM segment has a
table-of-contents just like the per-query DSM segment, and initially the
contents are a shared record typmod registry and a DSA area to provide the
space it needs to grow.
State relating to the current session is accessed via a Session object
reached through global variable CurrentSession that may require significant
redesign further down the road as we figure out what else needs to be shared
or remodelled.
Author: Thomas Munro
Reviewed-By: Andres Freund
Discussion: https://postgr.es/m/CAEepm=0ZtQ-SpsgCyzzYpsXS6e=kZWqk3g5Ygn3MDV7A8dabUA@mail.gmail.com
Diffstat (limited to 'src/backend/utils/init/postinit.c')
| -rw-r--r-- | src/backend/utils/init/postinit.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/backend/utils/init/postinit.c b/src/backend/utils/init/postinit.c index eb6960d93fa..20f1d279e9c 100644 --- a/src/backend/utils/init/postinit.c +++ b/src/backend/utils/init/postinit.c @@ -21,6 +21,7 @@ #include "access/heapam.h" #include "access/htup_details.h" +#include "access/session.h" #include "access/sysattr.h" #include "access/xact.h" #include "access/xlog.h" @@ -1027,6 +1028,9 @@ InitPostgres(const char *in_dbname, Oid dboid, const char *username, /* initialize client encoding */ InitializeClientEncoding(); + /* Initialize this backend's session state. */ + InitializeSession(); + /* report this backend in the PgBackendStatus array */ if (!bootstrap) pgstat_bestart(); |