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-rw-r--r--contrib/Makefile1
-rw-r--r--contrib/bloom/blscan.c1
-rw-r--r--contrib/meson.build1
-rw-r--r--contrib/old_snapshot/Makefile21
-rw-r--r--contrib/old_snapshot/meson.build23
-rw-r--r--contrib/old_snapshot/old_snapshot--1.0.sql14
-rw-r--r--contrib/old_snapshot/old_snapshot.control5
-rw-r--r--contrib/old_snapshot/time_mapping.c142
8 files changed, 0 insertions, 208 deletions
diff --git a/contrib/Makefile b/contrib/Makefile
index bbf220407b0..da4e2316a3b 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -29,7 +29,6 @@ SUBDIRS = \
lo \
ltree \
oid2name \
- old_snapshot \
pageinspect \
passwordcheck \
pg_buffercache \
diff --git a/contrib/bloom/blscan.c b/contrib/bloom/blscan.c
index 6cc7d07164a..61d1f66b387 100644
--- a/contrib/bloom/blscan.c
+++ b/contrib/bloom/blscan.c
@@ -132,7 +132,6 @@ blgetbitmap(IndexScanDesc scan, TIDBitmap *tbm)
LockBuffer(buffer, BUFFER_LOCK_SHARE);
page = BufferGetPage(buffer);
- TestForOldSnapshot(scan->xs_snapshot, scan->indexRelation, page);
if (!PageIsNew(page) && !BloomPageIsDeleted(page))
{
diff --git a/contrib/meson.build b/contrib/meson.build
index bd4a57c43c0..84d4e185618 100644
--- a/contrib/meson.build
+++ b/contrib/meson.build
@@ -37,7 +37,6 @@ subdir('lo')
subdir('ltree')
subdir('ltree_plpython')
subdir('oid2name')
-subdir('old_snapshot')
subdir('pageinspect')
subdir('passwordcheck')
subdir('pg_buffercache')
diff --git a/contrib/old_snapshot/Makefile b/contrib/old_snapshot/Makefile
deleted file mode 100644
index adb557532fc..00000000000
--- a/contrib/old_snapshot/Makefile
+++ /dev/null
@@ -1,21 +0,0 @@
-# contrib/old_snapshot/Makefile
-
-MODULE_big = old_snapshot
-OBJS = \
- $(WIN32RES) \
- time_mapping.o
-
-EXTENSION = old_snapshot
-DATA = old_snapshot--1.0.sql
-PGFILEDESC = "old_snapshot - utilities in support of old_snapshot_threshold"
-
-ifdef USE_PGXS
-PG_CONFIG = pg_config
-PGXS := $(shell $(PG_CONFIG) --pgxs)
-include $(PGXS)
-else
-subdir = contrib/old_snapshot
-top_builddir = ../..
-include $(top_builddir)/src/Makefile.global
-include $(top_srcdir)/contrib/contrib-global.mk
-endif
diff --git a/contrib/old_snapshot/meson.build b/contrib/old_snapshot/meson.build
deleted file mode 100644
index fe5fb9027ab..00000000000
--- a/contrib/old_snapshot/meson.build
+++ /dev/null
@@ -1,23 +0,0 @@
-# Copyright (c) 2022-2023, PostgreSQL Global Development Group
-
-old_snapshot_sources = files(
- 'time_mapping.c',
-)
-
-if host_system == 'windows'
- old_snapshot_sources += rc_lib_gen.process(win32ver_rc, extra_args: [
- '--NAME', 'old_snapshot',
- '--FILEDESC', 'old_snapshot - utilities in support of old_snapshot_threshold',])
-endif
-
-old_snapshot = shared_module('old_snapshot',
- old_snapshot_sources,
- kwargs: contrib_mod_args,
-)
-contrib_targets += old_snapshot
-
-install_data(
- 'old_snapshot.control',
- 'old_snapshot--1.0.sql',
- kwargs: contrib_data_args,
-)
diff --git a/contrib/old_snapshot/old_snapshot--1.0.sql b/contrib/old_snapshot/old_snapshot--1.0.sql
deleted file mode 100644
index 9ebb8829e37..00000000000
--- a/contrib/old_snapshot/old_snapshot--1.0.sql
+++ /dev/null
@@ -1,14 +0,0 @@
-/* contrib/old_snapshot/old_snapshot--1.0.sql */
-
--- complain if script is sourced in psql, rather than via CREATE EXTENSION
-\echo Use "CREATE EXTENSION old_snapshot" to load this file. \quit
-
--- Show visibility map and page-level visibility information for each block.
-CREATE FUNCTION pg_old_snapshot_time_mapping(array_offset OUT int4,
- end_timestamp OUT timestamptz,
- newest_xmin OUT xid)
-RETURNS SETOF record
-AS 'MODULE_PATHNAME', 'pg_old_snapshot_time_mapping'
-LANGUAGE C STRICT;
-
--- XXX. Do we want REVOKE commands here?
diff --git a/contrib/old_snapshot/old_snapshot.control b/contrib/old_snapshot/old_snapshot.control
deleted file mode 100644
index 491eec536cd..00000000000
--- a/contrib/old_snapshot/old_snapshot.control
+++ /dev/null
@@ -1,5 +0,0 @@
-# old_snapshot extension
-comment = 'utilities in support of old_snapshot_threshold'
-default_version = '1.0'
-module_pathname = '$libdir/old_snapshot'
-relocatable = true
diff --git a/contrib/old_snapshot/time_mapping.c b/contrib/old_snapshot/time_mapping.c
deleted file mode 100644
index 352308cd49b..00000000000
--- a/contrib/old_snapshot/time_mapping.c
+++ /dev/null
@@ -1,142 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- * time_mapping.c
- * time to XID mapping information
- *
- * Copyright (c) 2020-2023, PostgreSQL Global Development Group
- *
- * contrib/old_snapshot/time_mapping.c
- *-------------------------------------------------------------------------
- */
-#include "postgres.h"
-
-#include "funcapi.h"
-#include "storage/lwlock.h"
-#include "utils/old_snapshot.h"
-#include "utils/snapmgr.h"
-#include "utils/timestamp.h"
-
-/*
- * Backend-private copy of the information from oldSnapshotControl which relates
- * to the time to XID mapping, plus an index so that we can iterate.
- *
- * Note that the length of the xid_by_minute array is given by
- * OLD_SNAPSHOT_TIME_MAP_ENTRIES (which is not a compile-time constant).
- */
-typedef struct
-{
- int current_index;
- int head_offset;
- TimestampTz head_timestamp;
- int count_used;
- TransactionId xid_by_minute[FLEXIBLE_ARRAY_MEMBER];
-} OldSnapshotTimeMapping;
-
-#define NUM_TIME_MAPPING_COLUMNS 3
-
-PG_MODULE_MAGIC;
-PG_FUNCTION_INFO_V1(pg_old_snapshot_time_mapping);
-
-static OldSnapshotTimeMapping *GetOldSnapshotTimeMapping(void);
-static HeapTuple MakeOldSnapshotTimeMappingTuple(TupleDesc tupdesc,
- OldSnapshotTimeMapping *mapping);
-
-/*
- * SQL-callable set-returning function.
- */
-Datum
-pg_old_snapshot_time_mapping(PG_FUNCTION_ARGS)
-{
- FuncCallContext *funcctx;
- OldSnapshotTimeMapping *mapping;
-
- if (SRF_IS_FIRSTCALL())
- {
- MemoryContext oldcontext;
- TupleDesc tupdesc;
-
- funcctx = SRF_FIRSTCALL_INIT();
- oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
- mapping = GetOldSnapshotTimeMapping();
- funcctx->user_fctx = mapping;
- if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
- elog(ERROR, "return type must be a row type");
- funcctx->tuple_desc = tupdesc;
- MemoryContextSwitchTo(oldcontext);
- }
-
- funcctx = SRF_PERCALL_SETUP();
- mapping = (OldSnapshotTimeMapping *) funcctx->user_fctx;
-
- while (mapping->current_index < mapping->count_used)
- {
- HeapTuple tuple;
-
- tuple = MakeOldSnapshotTimeMappingTuple(funcctx->tuple_desc, mapping);
- ++mapping->current_index;
- SRF_RETURN_NEXT(funcctx, HeapTupleGetDatum(tuple));
- }
-
- SRF_RETURN_DONE(funcctx);
-}
-
-/*
- * Get the old snapshot time mapping data from shared memory.
- */
-static OldSnapshotTimeMapping *
-GetOldSnapshotTimeMapping(void)
-{
- OldSnapshotTimeMapping *mapping;
-
- mapping = palloc(offsetof(OldSnapshotTimeMapping, xid_by_minute)
- + sizeof(TransactionId) * OLD_SNAPSHOT_TIME_MAP_ENTRIES);
- mapping->current_index = 0;
-
- LWLockAcquire(OldSnapshotTimeMapLock, LW_SHARED);
- mapping->head_offset = oldSnapshotControl->head_offset;
- mapping->head_timestamp = oldSnapshotControl->head_timestamp;
- mapping->count_used = oldSnapshotControl->count_used;
- for (int i = 0; i < OLD_SNAPSHOT_TIME_MAP_ENTRIES; ++i)
- mapping->xid_by_minute[i] = oldSnapshotControl->xid_by_minute[i];
- LWLockRelease(OldSnapshotTimeMapLock);
-
- return mapping;
-}
-
-/*
- * Convert one entry from the old snapshot time mapping to a HeapTuple.
- */
-static HeapTuple
-MakeOldSnapshotTimeMappingTuple(TupleDesc tupdesc, OldSnapshotTimeMapping *mapping)
-{
- Datum values[NUM_TIME_MAPPING_COLUMNS];
- bool nulls[NUM_TIME_MAPPING_COLUMNS];
- int array_position;
- TimestampTz timestamp;
-
- /*
- * Figure out the array position corresponding to the current index.
- *
- * Index 0 means the oldest entry in the mapping, which is stored at
- * mapping->head_offset. Index 1 means the next-oldest entry, which is a
- * the following index, and so on. We wrap around when we reach the end of
- * the array.
- */
- array_position = (mapping->head_offset + mapping->current_index)
- % OLD_SNAPSHOT_TIME_MAP_ENTRIES;
-
- /*
- * No explicit timestamp is stored for any entry other than the oldest
- * one, but each entry corresponds to 1-minute period, so we can just add.
- */
- timestamp = TimestampTzPlusMilliseconds(mapping->head_timestamp,
- mapping->current_index * 60000);
-
- /* Initialize nulls and values arrays. */
- memset(nulls, 0, sizeof(nulls));
- values[0] = Int32GetDatum(array_position);
- values[1] = TimestampTzGetDatum(timestamp);
- values[2] = TransactionIdGetDatum(mapping->xid_by_minute[array_position]);
-
- return heap_form_tuple(tupdesc, values, nulls);
-}
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-17 01:36:42 +0000