On Tue, Jun 17, 2025 at 05:43:24PM +0530, Rahila Syed wrote:
>> Using a DSA from the registry is cumbersome. You essentially need
>> another batch of shared memory to keep track of the pointers and do
>> locking, so it might not be tremendously useful on its own
>
> Isn't this true while using dshash from the registry as well?
No, once you have a pointer to the dshash table, you should be able to
access it without any other special runtime-generated pointers.
> What if we make the DSM registry hash table generic so it can be used for
> dsm segments, dsas as well as dshashs?
>
> The DSMRegistryEntry could be modified as follows to contain a dsa_pointer
> instead of actual values.
> typedef struct DSMRegistryEntry
> {
> char name[64];
> dsa_pointer value;
> } DSMRegistryEntry;
>
> This dsa_pointer could point to a memory chunk in the same dsa that's
> created by init_dsm_registry to store the Dshash registry table.
>
> This pointer can be cast to a structure pointer with information about
> DSMs, DSAs, or DSHASHs, based on which one we want to register in the
> registry.
I like this idea, but I took it one step further in the attached patch and
made the registry entry struct flexible enough to store any type of entry.
Specifically, I've added a new "type" enum followed by a union of the
different structs used to store the entry data. I was originally trying to
avoid this kind of invasive change, but it's not nearly as complicated as I
feared, and there are benefits such as fewer shared memory things to juggle
and better sanity checking. It should also be easy to extend in the
future. WDYT?
> -static TestDSMRegistryStruct *tdr_state;
> +typedef struct TestDSMRegistryHashEntry
> +{
> + char key[64];
> + dsa_handle val;
> +} TestDSMRegistryHashEntry;
>
> Did you mean to create val as dsa_pointer instead of dsa_handle?
> You assigned it a dsa_pointer in set_val_in_hash() function.
Yes, good catch.
--
nathan
>From 1bc7ab1c4ad4aa420b282cb40e09353fe9349745 Mon Sep 17 00:00:00 2001
From: Nathan Bossart <[email protected]>
Date: Wed, 4 Jun 2025 14:21:14 -0500
Subject: [PATCH v9 1/1] simplify creating hash table in dsm registry
---
src/backend/storage/ipc/dsm_registry.c | 263 +++++++++++++++++-
src/backend/utils/mmgr/dsa.c | 15 +
src/include/storage/dsm_registry.h | 7 +-
src/include/utils/dsa.h | 1 +
.../expected/test_dsm_registry.out | 26 +-
.../sql/test_dsm_registry.sql | 6 +-
.../test_dsm_registry--1.0.sql | 10 +-
.../test_dsm_registry/test_dsm_registry.c | 111 ++++++--
src/tools/pgindent/typedefs.list | 5 +
9 files changed, 398 insertions(+), 46 deletions(-)
diff --git a/src/backend/storage/ipc/dsm_registry.c
b/src/backend/storage/ipc/dsm_registry.c
index 1d4fd31ffed..136fe8b8d7d 100644
--- a/src/backend/storage/ipc/dsm_registry.c
+++ b/src/backend/storage/ipc/dsm_registry.c
@@ -15,6 +15,20 @@
* current backend. This function guarantees that only one backend
* initializes the segment and that all other backends just attach it.
*
+ * A DSA can be created in or retrieved from the registry by calling
+ * GetNamedDSA(). As with GetNamedDSMSegment(), if a DSA with the provided
+ * name does not yet exist, it is created. Otherwise, GetNamedDSA()
+ * ensures the DSA is attached to the current backend. This function
+ * guarantees that only one backend initializes the DSA and that all other
+ * backends just attach it.
+ *
+ * A dshash table can be created in or retrieved from the registry by
+ * calling GetNamedDSHash(). As with GetNamedDSMSegment(), if a hash
+ * table with the provided name does not yet exist, it is created.
+ * Otherwise, GetNamedDSHash() ensures the hash table is attached to the
+ * current backend. This function guarantees that only one backend
+ * initializes the table and that all other backends just attach it.
+ *
* Portions Copyright (c) 1996-2025, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
@@ -32,6 +46,12 @@
#include "storage/shmem.h"
#include "utils/memutils.h"
+#define DSMR_NAME_LEN 128
+
+#define DSMR_DSA_TRANCHE_SUFFIX " DSA"
+#define DSMR_DSA_TRANCHE_SUFFIX_LEN (sizeof(DSMR_DSA_TRANCHE_SUFFIX) - 1)
+#define DSMR_DSA_TRANCHE_NAME_LEN (DSMR_NAME_LEN +
DSMR_DSA_TRANCHE_SUFFIX_LEN)
+
typedef struct DSMRegistryCtxStruct
{
dsa_handle dsah;
@@ -40,15 +60,48 @@ typedef struct DSMRegistryCtxStruct
static DSMRegistryCtxStruct *DSMRegistryCtx;
-typedef struct DSMRegistryEntry
+typedef struct NamedDSMState
{
- char name[64];
dsm_handle handle;
size_t size;
+} NamedDSMState;
+
+typedef struct NamedDSAState
+{
+ dsa_handle handle;
+ int tranche;
+ char tranche_name[DSMR_DSA_TRANCHE_NAME_LEN];
+} NamedDSAState;
+
+typedef struct NamedDSHState
+{
+ NamedDSAState dsa;
+ dshash_table_handle handle;
+ int tranche;
+ char tranche_name[DSMR_NAME_LEN];
+} NamedDSHState;
+
+typedef enum DSMREntryType
+{
+ DSMR_ENTRY_TYPE_DSM,
+ DSMR_ENTRY_TYPE_DSA,
+ DSMR_ENTRY_TYPE_DSH,
+} DSMREntryType;
+
+typedef struct DSMRegistryEntry
+{
+ char name[DSMR_NAME_LEN];
+ DSMREntryType type;
+ union
+ {
+ NamedDSMState dsm;
+ NamedDSAState dsa;
+ NamedDSHState dsh;
+ } data;
} DSMRegistryEntry;
static const dshash_parameters dsh_params = {
- offsetof(DSMRegistryEntry, handle),
+ offsetof(DSMRegistryEntry, type),
sizeof(DSMRegistryEntry),
dshash_strcmp,
dshash_strhash,
@@ -141,7 +194,7 @@ GetNamedDSMSegment(const char *name, size_t size,
ereport(ERROR,
(errmsg("DSM segment name cannot be empty")));
- if (strlen(name) >= offsetof(DSMRegistryEntry, handle))
+ if (strlen(name) >= offsetof(DSMRegistryEntry, type))
ereport(ERROR,
(errmsg("DSM segment name too long")));
@@ -158,32 +211,39 @@ GetNamedDSMSegment(const char *name, size_t size,
entry = dshash_find_or_insert(dsm_registry_table, name, found);
if (!(*found))
{
+ NamedDSMState *state = &entry->data.dsm;
+ dsm_segment *seg;
+
+ entry->type = DSMR_ENTRY_TYPE_DSM;
+
/* Initialize the segment. */
- dsm_segment *seg = dsm_create(size, 0);
+ seg = dsm_create(size, 0);
dsm_pin_segment(seg);
dsm_pin_mapping(seg);
- entry->handle = dsm_segment_handle(seg);
- entry->size = size;
+ state->handle = dsm_segment_handle(seg);
+ state->size = size;
ret = dsm_segment_address(seg);
if (init_callback)
(*init_callback) (ret);
}
- else if (entry->size != size)
- {
+ else if (entry->type != DSMR_ENTRY_TYPE_DSM)
ereport(ERROR,
- (errmsg("requested DSM segment size does not
match size of "
- "existing segment")));
- }
+ (errmsg("requested DSM segment does not match
type of existing entry")));
+ else if (entry->data.dsm.size != size)
+ ereport(ERROR,
+ (errmsg("requested DSM segment size does not
match size of existing segment")));
else
{
- dsm_segment *seg = dsm_find_mapping(entry->handle);
+ NamedDSMState *state = &entry->data.dsm;
+ dsm_segment *seg;
/* If the existing segment is not already attached, attach it
now. */
+ seg = dsm_find_mapping(state->handle);
if (seg == NULL)
{
- seg = dsm_attach(entry->handle);
+ seg = dsm_attach(state->handle);
if (seg == NULL)
elog(ERROR, "could not map dynamic shared
memory segment");
@@ -198,3 +258,178 @@ GetNamedDSMSegment(const char *name, size_t size,
return ret;
}
+
+/*
+ * Initialize or attach a named DSA.
+ *
+ * This routine returns a pointer to the DSA. A new LWLock tranche ID will be
+ * generated if needed. Note that the lock tranche will be registered with the
+ * provided name. Also note that this should be called at most once for a
+ * given DSA in each backend.
+ */
+dsa_area *
+GetNamedDSA(const char *name, bool *found)
+{
+ DSMRegistryEntry *entry;
+ MemoryContext oldcontext;
+ dsa_area *ret;
+
+ Assert(found);
+
+ if (!name || *name == '\0')
+ ereport(ERROR,
+ (errmsg("DSA name cannot be empty")));
+
+ if (strlen(name) >= offsetof(DSMRegistryEntry, type))
+ ereport(ERROR,
+ (errmsg("DSA name too long")));
+
+ /* Be sure any local memory allocated by DSM/DSA routines is
persistent. */
+ oldcontext = MemoryContextSwitchTo(TopMemoryContext);
+
+ /* Connect to the registry. */
+ init_dsm_registry();
+
+ entry = dshash_find_or_insert(dsm_registry_table, name, found);
+ if (!(*found))
+ {
+ NamedDSAState *state = &entry->data.dsa;
+
+ entry->type = DSMR_ENTRY_TYPE_DSA;
+
+ /* Initialize the LWLock tranche for the DSA. */
+ state->tranche = LWLockNewTrancheId();
+ strcpy(state->tranche_name, name);
+ LWLockRegisterTranche(state->tranche, state->tranche_name);
+
+ /* Initialize the DSA. */
+ ret = dsa_create(state->tranche);
+ dsa_pin(ret);
+ dsa_pin_mapping(ret);
+
+ /* Store handle for other backends to use. */
+ state->handle = dsa_get_handle(ret);
+ }
+ else if (entry->type != DSMR_ENTRY_TYPE_DSA)
+ ereport(ERROR,
+ (errmsg("requested DSA does not match type of
existing entry")));
+ else if (dsa_is_attached(entry->data.dsa.handle))
+ ereport(ERROR,
+ (errmsg("requested DSA already attached to
current process")));
+ else
+ {
+ NamedDSAState *state = &entry->data.dsa;
+
+ /* Initialize existing LWLock tranche for the DSA. */
+ LWLockRegisterTranche(state->tranche, state->tranche_name);
+
+ /* Attach to existing DSA. */
+ ret = dsa_attach(state->handle);
+ dsa_pin_mapping(ret);
+ }
+
+ dshash_release_lock(dsm_registry_table, entry);
+ MemoryContextSwitchTo(oldcontext);
+
+ return ret;
+}
+
+/*
+ * Initialize or attach a named dshash table.
+ *
+ * This routine returns the address of the table. The tranche_id member of
+ * params is ignored; new tranche IDs will be generated if needed. Note that
+ * the DSA lock tranche will be registered with the provided name with " DSA"
+ * appended. The dshash lock tranche will be registered with the provided
+ * name. Also note that this should be called at most once for a given table
+ * in each backend.
+ */
+dshash_table *
+GetNamedDSHash(const char *name, const dshash_parameters *params, bool *found)
+{
+ DSMRegistryEntry *entry;
+ MemoryContext oldcontext;
+ dshash_table *ret;
+
+ Assert(params);
+ Assert(found);
+
+ if (!name || *name == '\0')
+ ereport(ERROR,
+ (errmsg("DSHash name cannot be empty")));
+
+ if (strlen(name) >= offsetof(DSMRegistryEntry, type))
+ ereport(ERROR,
+ (errmsg("DSHash name too long")));
+
+ /* Be sure any local memory allocated by DSM/DSA routines is
persistent. */
+ oldcontext = MemoryContextSwitchTo(TopMemoryContext);
+
+ /* Connect to the registry. */
+ init_dsm_registry();
+
+ entry = dshash_find_or_insert(dsm_registry_table, name, found);
+ if (!(*found))
+ {
+ NamedDSAState *dsa_state = &entry->data.dsh.dsa;
+ NamedDSHState *dsh_state = &entry->data.dsh;
+ dshash_parameters params_copy;
+ dsa_area *dsa;
+
+ entry->type = DSMR_ENTRY_TYPE_DSH;
+
+ /* Initialize the LWLock tranche for the DSA. */
+ dsa_state->tranche = LWLockNewTrancheId();
+ sprintf(dsa_state->tranche_name, "%s%s", name,
DSMR_DSA_TRANCHE_SUFFIX);
+ LWLockRegisterTranche(dsa_state->tranche,
dsa_state->tranche_name);
+
+ /* Initialize the LWLock tranche for the dshash table. */
+ dsh_state->tranche = LWLockNewTrancheId();
+ strcpy(dsh_state->tranche_name, name);
+ LWLockRegisterTranche(dsh_state->tranche,
dsh_state->tranche_name);
+
+ /* Initialize the DSA for the hash table. */
+ dsa = dsa_create(dsa_state->tranche);
+ dsa_pin(dsa);
+ dsa_pin_mapping(dsa);
+
+ /* Initialize the dshash table. */
+ memcpy(¶ms_copy, params, sizeof(dshash_parameters));
+ params_copy.tranche_id = dsh_state->tranche;
+ ret = dshash_create(dsa, ¶ms_copy, NULL);
+
+ /* Store handles in the DSM segment for other backends to use.
*/
+ dsa_state->handle = dsa_get_handle(dsa);
+ dsh_state->handle = dshash_get_hash_table_handle(ret);
+ }
+ else if (entry->type != DSMR_ENTRY_TYPE_DSH)
+ ereport(ERROR,
+ (errmsg("requested DSHash does not match type
of existing entry")));
+ else if (dsa_is_attached(entry->data.dsa.handle))
+ ereport(ERROR,
+ (errmsg("requested DSHash already attached to
current process")));
+ else
+ {
+ NamedDSAState *dsa_state = &entry->data.dsh.dsa;
+ NamedDSHState *dsh_state = &entry->data.dsh;
+ dsa_area *dsa;
+
+ /* XXX: Should we verify params matches what table was created
with? */
+
+ /* Initialize existing LWLock tranches for the DSA and dshash
table. */
+ LWLockRegisterTranche(dsa_state->tranche,
dsa_state->tranche_name);
+ LWLockRegisterTranche(dsh_state->tranche,
dsh_state->tranche_name);
+
+ /* Attach to existing DSA for the hash table. */
+ dsa = dsa_attach(dsa_state->handle);
+ dsa_pin_mapping(dsa);
+
+ /* Attach to existing dshash table. */
+ ret = dshash_attach(dsa, params, dsh_state->handle, NULL);
+ }
+
+ dshash_release_lock(dsm_registry_table, entry);
+ MemoryContextSwitchTo(oldcontext);
+
+ return ret;
+}
diff --git a/src/backend/utils/mmgr/dsa.c b/src/backend/utils/mmgr/dsa.c
index 17d4f7a7a06..be43e9351c3 100644
--- a/src/backend/utils/mmgr/dsa.c
+++ b/src/backend/utils/mmgr/dsa.c
@@ -531,6 +531,21 @@ dsa_attach(dsa_handle handle)
return area;
}
+/*
+ * Returns whether the area with the given handle was already attached by the
+ * current process. The area must have been created with dsa_create (not
+ * dsa_create_in_place).
+ */
+bool
+dsa_is_attached(dsa_handle handle)
+{
+ /*
+ * An area handle is really a DSM segment handle for the first segment,
so
+ * we can just search for that.
+ */
+ return dsm_find_mapping(handle) != NULL;
+}
+
/*
* Attach to an area that was created with dsa_create_in_place. The caller
* must somehow know the location in memory that was used when the area was
diff --git a/src/include/storage/dsm_registry.h
b/src/include/storage/dsm_registry.h
index b381e44bc9d..4871ed509eb 100644
--- a/src/include/storage/dsm_registry.h
+++ b/src/include/storage/dsm_registry.h
@@ -13,10 +13,15 @@
#ifndef DSM_REGISTRY_H
#define DSM_REGISTRY_H
+#include "lib/dshash.h"
+
extern void *GetNamedDSMSegment(const char *name, size_t size,
void
(*init_callback) (void *ptr),
bool *found);
-
+extern dsa_area *GetNamedDSA(const char *name, bool *found);
+extern dshash_table *GetNamedDSHash(const char *name,
+ const
dshash_parameters *params,
+ bool
*found);
extern Size DSMRegistryShmemSize(void);
extern void DSMRegistryShmemInit(void);
diff --git a/src/include/utils/dsa.h b/src/include/utils/dsa.h
index 9eca8788908..0a6067be628 100644
--- a/src/include/utils/dsa.h
+++ b/src/include/utils/dsa.h
@@ -145,6 +145,7 @@ extern dsa_area *dsa_create_in_place_ext(void *place,
size_t size,
size_t init_segment_size,
size_t max_segment_size);
extern dsa_area *dsa_attach(dsa_handle handle);
+extern bool dsa_is_attached(dsa_handle handle);
extern dsa_area *dsa_attach_in_place(void *place, dsm_segment *segment);
extern void dsa_release_in_place(void *place);
extern void dsa_on_dsm_detach_release_in_place(dsm_segment *, Datum);
diff --git a/src/test/modules/test_dsm_registry/expected/test_dsm_registry.out
b/src/test/modules/test_dsm_registry/expected/test_dsm_registry.out
index 8ffbd343a05..7ee02bb51e3 100644
--- a/src/test/modules/test_dsm_registry/expected/test_dsm_registry.out
+++ b/src/test/modules/test_dsm_registry/expected/test_dsm_registry.out
@@ -1,14 +1,26 @@
CREATE EXTENSION test_dsm_registry;
-SELECT set_val_in_shmem(1236);
- set_val_in_shmem
-------------------
+SELECT set_val_in_dsm(1236);
+ set_val_in_dsm
+----------------
+
+(1 row)
+
+SELECT set_val_in_hash('test', '1414');
+ set_val_in_hash
+-----------------
(1 row)
\c
-SELECT get_val_in_shmem();
- get_val_in_shmem
-------------------
- 1236
+SELECT get_val_in_dsm();
+ get_val_in_dsm
+----------------
+ 1236
+(1 row)
+
+SELECT get_val_in_hash('test');
+ get_val_in_hash
+-----------------
+ 1414
(1 row)
diff --git a/src/test/modules/test_dsm_registry/sql/test_dsm_registry.sql
b/src/test/modules/test_dsm_registry/sql/test_dsm_registry.sql
index b3351be0a16..7076f825260 100644
--- a/src/test/modules/test_dsm_registry/sql/test_dsm_registry.sql
+++ b/src/test/modules/test_dsm_registry/sql/test_dsm_registry.sql
@@ -1,4 +1,6 @@
CREATE EXTENSION test_dsm_registry;
-SELECT set_val_in_shmem(1236);
+SELECT set_val_in_dsm(1236);
+SELECT set_val_in_hash('test', '1414');
\c
-SELECT get_val_in_shmem();
+SELECT get_val_in_dsm();
+SELECT get_val_in_hash('test');
diff --git a/src/test/modules/test_dsm_registry/test_dsm_registry--1.0.sql
b/src/test/modules/test_dsm_registry/test_dsm_registry--1.0.sql
index 8c55b0919b1..74ceeccfd3b 100644
--- a/src/test/modules/test_dsm_registry/test_dsm_registry--1.0.sql
+++ b/src/test/modules/test_dsm_registry/test_dsm_registry--1.0.sql
@@ -3,8 +3,14 @@
-- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "CREATE EXTENSION test_dsm_registry" to load this file. \quit
-CREATE FUNCTION set_val_in_shmem(val INT) RETURNS VOID
+CREATE FUNCTION set_val_in_dsm(val INT) RETURNS VOID
AS 'MODULE_PATHNAME' LANGUAGE C;
-CREATE FUNCTION get_val_in_shmem() RETURNS INT
+CREATE FUNCTION get_val_in_dsm() RETURNS INT
+ AS 'MODULE_PATHNAME' LANGUAGE C;
+
+CREATE FUNCTION set_val_in_hash(key TEXT, val TEXT) RETURNS VOID
+ AS 'MODULE_PATHNAME' LANGUAGE C;
+
+CREATE FUNCTION get_val_in_hash(key TEXT) RETURNS TEXT
AS 'MODULE_PATHNAME' LANGUAGE C;
diff --git a/src/test/modules/test_dsm_registry/test_dsm_registry.c
b/src/test/modules/test_dsm_registry/test_dsm_registry.c
index 96a890be228..a9e60c4126b 100644
--- a/src/test/modules/test_dsm_registry/test_dsm_registry.c
+++ b/src/test/modules/test_dsm_registry/test_dsm_registry.c
@@ -15,6 +15,7 @@
#include "fmgr.h"
#include "storage/dsm_registry.h"
#include "storage/lwlock.h"
+#include "utils/builtins.h"
PG_MODULE_MAGIC;
@@ -24,15 +25,31 @@ typedef struct TestDSMRegistryStruct
LWLock lck;
} TestDSMRegistryStruct;
-static TestDSMRegistryStruct *tdr_state;
+typedef struct TestDSMRegistryHashEntry
+{
+ char key[64];
+ dsa_pointer val;
+} TestDSMRegistryHashEntry;
+
+static TestDSMRegistryStruct *tdr_dsm;
+static dsa_area *tdr_dsa;
+static dshash_table *tdr_hash;
+
+static const dshash_parameters dsh_params = {
+ offsetof(TestDSMRegistryHashEntry, val),
+ sizeof(TestDSMRegistryHashEntry),
+ dshash_strcmp,
+ dshash_strhash,
+ dshash_strcpy
+};
static void
-tdr_init_shmem(void *ptr)
+init_tdr_dsm(void *ptr)
{
- TestDSMRegistryStruct *state = (TestDSMRegistryStruct *) ptr;
+ TestDSMRegistryStruct *dsm = (TestDSMRegistryStruct *) ptr;
- LWLockInitialize(&state->lck, LWLockNewTrancheId());
- state->val = 0;
+ LWLockInitialize(&dsm->lck, LWLockNewTrancheId());
+ dsm->val = 0;
}
static void
@@ -40,37 +57,91 @@ tdr_attach_shmem(void)
{
bool found;
- tdr_state = GetNamedDSMSegment("test_dsm_registry",
-
sizeof(TestDSMRegistryStruct),
-
tdr_init_shmem,
- &found);
- LWLockRegisterTranche(tdr_state->lck.tranche, "test_dsm_registry");
+ tdr_dsm = GetNamedDSMSegment("test_dsm_registry_dsm",
+
sizeof(TestDSMRegistryStruct),
+ init_tdr_dsm,
+ &found);
+ LWLockRegisterTranche(tdr_dsm->lck.tranche, "test_dsm_registry");
+
+ if (tdr_dsa == NULL)
+ tdr_dsa = GetNamedDSA("test_dsm_registry_dsa", &found);
+
+ if (tdr_hash == NULL)
+ tdr_hash = GetNamedDSHash("test_dsm_registry_hash",
&dsh_params, &found);
}
-PG_FUNCTION_INFO_V1(set_val_in_shmem);
+PG_FUNCTION_INFO_V1(set_val_in_dsm);
Datum
-set_val_in_shmem(PG_FUNCTION_ARGS)
+set_val_in_dsm(PG_FUNCTION_ARGS)
{
tdr_attach_shmem();
- LWLockAcquire(&tdr_state->lck, LW_EXCLUSIVE);
- tdr_state->val = PG_GETARG_INT32(0);
- LWLockRelease(&tdr_state->lck);
+ LWLockAcquire(&tdr_dsm->lck, LW_EXCLUSIVE);
+ tdr_dsm->val = PG_GETARG_INT32(0);
+ LWLockRelease(&tdr_dsm->lck);
PG_RETURN_VOID();
}
-PG_FUNCTION_INFO_V1(get_val_in_shmem);
+PG_FUNCTION_INFO_V1(get_val_in_dsm);
Datum
-get_val_in_shmem(PG_FUNCTION_ARGS)
+get_val_in_dsm(PG_FUNCTION_ARGS)
{
int ret;
tdr_attach_shmem();
- LWLockAcquire(&tdr_state->lck, LW_SHARED);
- ret = tdr_state->val;
- LWLockRelease(&tdr_state->lck);
+ LWLockAcquire(&tdr_dsm->lck, LW_SHARED);
+ ret = tdr_dsm->val;
+ LWLockRelease(&tdr_dsm->lck);
PG_RETURN_INT32(ret);
}
+
+PG_FUNCTION_INFO_V1(set_val_in_hash);
+Datum
+set_val_in_hash(PG_FUNCTION_ARGS)
+{
+ TestDSMRegistryHashEntry *entry;
+ char *key = TextDatumGetCString(PG_GETARG_DATUM(0));
+ char *val = TextDatumGetCString(PG_GETARG_DATUM(1));
+ bool found;
+
+ if (strlen(key) >= offsetof(TestDSMRegistryHashEntry, val))
+ ereport(ERROR,
+ (errmsg("key too long")));
+
+ tdr_attach_shmem();
+
+ entry = dshash_find_or_insert(tdr_hash, key, &found);
+ if (found)
+ dsa_free(tdr_dsa, entry->val);
+
+ entry->val = dsa_allocate(tdr_dsa, strlen(val) + 1);
+ strcpy(dsa_get_address(tdr_dsa, entry->val), val);
+
+ dshash_release_lock(tdr_hash, entry);
+
+ PG_RETURN_VOID();
+}
+
+PG_FUNCTION_INFO_V1(get_val_in_hash);
+Datum
+get_val_in_hash(PG_FUNCTION_ARGS)
+{
+ TestDSMRegistryHashEntry *entry;
+ char *key = TextDatumGetCString(PG_GETARG_DATUM(0));
+ text *val = NULL;
+
+ tdr_attach_shmem();
+
+ entry = dshash_find(tdr_hash, key, false);
+ if (entry == NULL)
+ PG_RETURN_NULL();
+
+ val = cstring_to_text(dsa_get_address(tdr_dsa, entry->val));
+
+ dshash_release_lock(tdr_hash, entry);
+
+ PG_RETURN_TEXT_P(val);
+}
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 32d6e718adc..651e4e4f741 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -601,6 +601,7 @@ DR_intorel
DR_printtup
DR_sqlfunction
DR_transientrel
+DSMREntryType
DSMRegistryCtxStruct
DSMRegistryEntry
DWORD
@@ -1736,6 +1737,9 @@ Name
NameData
NameHashEntry
NamedArgExpr
+NamedDSAState
+NamedDSHState
+NamedDSMState
NamedLWLockTranche
NamedLWLockTrancheRequest
NamedTuplestoreScan
@@ -3006,6 +3010,7 @@ Tcl_Obj
Tcl_Size
Tcl_Time
TempNamespaceStatus
+TestDSMRegistryHashEntry
TestDSMRegistryStruct
TestDecodingData
TestDecodingTxnData
--
2.39.5 (Apple Git-154)
