On 2024-Jan-23, Alvaro Herrera wrote:
> This is what I came up with.
Hm, I forgot the attachment, thanks Heikki for the reminder.
--
Álvaro Herrera PostgreSQL Developer — https://www.EnterpriseDB.com/
"Las mujeres son como hondas: mientras más resistencia tienen,
más lejos puedes llegar con ellas" (Jonas Nightingale, Leap of Faith)
>From 2f5185cdd37e3502520d85e5f6f565b58330e702 Mon Sep 17 00:00:00 2001
From: Alvaro Herrera <alvhe...@alvh.no-ip.org>
Date: Tue, 23 Jan 2024 10:36:14 +0100
Subject: [PATCH v2] Use designated initializers for BuiltinTrancheNames
---
src/backend/storage/lmgr/Makefile | 3 +-
.../storage/lmgr/generate-lwlocknames.pl | 10 +-
src/backend/storage/lmgr/lwlock.c | 110 ++++++------------
src/backend/storage/lmgr/meson.build | 10 +-
4 files changed, 49 insertions(+), 84 deletions(-)
diff --git a/src/backend/storage/lmgr/Makefile b/src/backend/storage/lmgr/Makefile
index 504480e847..81da6ee13a 100644
--- a/src/backend/storage/lmgr/Makefile
+++ b/src/backend/storage/lmgr/Makefile
@@ -12,13 +12,14 @@ subdir = src/backend/storage/lmgr
top_builddir = ../../../..
include $(top_builddir)/src/Makefile.global
+override CPPFLAGS := -I. $(CPPFLAGS)
+
OBJS = \
condition_variable.o \
deadlock.o \
lmgr.o \
lock.o \
lwlock.o \
- lwlocknames.o \
predicate.o \
proc.o \
s_lock.o \
diff --git a/src/backend/storage/lmgr/generate-lwlocknames.pl b/src/backend/storage/lmgr/generate-lwlocknames.pl
index 7b93ecf6c1..a679a4ff54 100644
--- a/src/backend/storage/lmgr/generate-lwlocknames.pl
+++ b/src/backend/storage/lmgr/generate-lwlocknames.pl
@@ -10,7 +10,6 @@ use Getopt::Long;
my $output_path = '.';
my $lastlockidx = -1;
-my $continue = "\n";
GetOptions('outdir:s' => \$output_path);
@@ -29,8 +28,6 @@ print $h $autogen;
print $h "/* there is deliberately not an #ifndef LWLOCKNAMES_H here */\n\n";
print $c $autogen, "\n";
-print $c "const char *const IndividualLWLockNames[] = {";
-
#
# First, record the predefined LWLocks listed in wait_event_names.txt. We'll
# cross-check those with the ones in lwlocknames.txt.
@@ -97,12 +94,10 @@ while (<$lwlocknames>)
while ($lastlockidx < $lockidx - 1)
{
++$lastlockidx;
- printf $c "%s \"<unassigned:%d>\"", $continue, $lastlockidx;
- $continue = ",\n";
+ printf $c "[%s] = \"<unassigned:%d>\",\n", $lastlockidx, $lastlockidx;
}
- printf $c "%s \"%s\"", $continue, $trimmedlockname;
+ printf $c "[%s] = \"%s\",\n", $lockidx, $trimmedlockname;
$lastlockidx = $lockidx;
- $continue = ",\n";
print $h "#define $lockname (&MainLWLockArray[$lockidx].lock)\n";
}
@@ -112,7 +107,6 @@ die
. "lwlocknames.txt"
if $i < scalar @wait_event_lwlocks;
-printf $c "\n};\n";
print $h "\n";
printf $h "#define NUM_INDIVIDUAL_LWLOCKS %s\n", $lastlockidx + 1;
diff --git a/src/backend/storage/lmgr/lwlock.c b/src/backend/storage/lmgr/lwlock.c
index 2f2de5a562..8aad9c6690 100644
--- a/src/backend/storage/lmgr/lwlock.c
+++ b/src/backend/storage/lmgr/lwlock.c
@@ -115,8 +115,8 @@ StaticAssertDecl(LW_VAL_EXCLUSIVE > (uint32) MAX_BACKENDS,
* There are three sorts of LWLock "tranches":
*
* 1. The individually-named locks defined in lwlocknames.h each have their
- * own tranche. The names of these tranches appear in IndividualLWLockNames[]
- * in lwlocknames.c.
+ * own tranche. The names of these tranches come from lwlocknames.c into
+ * BuiltinTranchNames[] below.
*
* 2. There are some predefined tranches for built-in groups of locks.
* These are listed in enum BuiltinTrancheIds in lwlock.h, and their names
@@ -129,75 +129,43 @@ StaticAssertDecl(LW_VAL_EXCLUSIVE > (uint32) MAX_BACKENDS,
* All these names are user-visible as wait event names, so choose with care
* ... and do not forget to update the documentation's list of wait events.
*/
-extern const char *const IndividualLWLockNames[]; /* in lwlocknames.c */
-
static const char *const BuiltinTrancheNames[] = {
- /* LWTRANCHE_XACT_BUFFER: */
- "XactBuffer",
- /* LWTRANCHE_COMMITTS_BUFFER: */
- "CommitTsBuffer",
- /* LWTRANCHE_SUBTRANS_BUFFER: */
- "SubtransBuffer",
- /* LWTRANCHE_MULTIXACTOFFSET_BUFFER: */
- "MultiXactOffsetBuffer",
- /* LWTRANCHE_MULTIXACTMEMBER_BUFFER: */
- "MultiXactMemberBuffer",
- /* LWTRANCHE_NOTIFY_BUFFER: */
- "NotifyBuffer",
- /* LWTRANCHE_SERIAL_BUFFER: */
- "SerialBuffer",
- /* LWTRANCHE_WAL_INSERT: */
- "WALInsert",
- /* LWTRANCHE_BUFFER_CONTENT: */
- "BufferContent",
- /* LWTRANCHE_REPLICATION_ORIGIN_STATE: */
- "ReplicationOriginState",
- /* LWTRANCHE_REPLICATION_SLOT_IO: */
- "ReplicationSlotIO",
- /* LWTRANCHE_LOCK_FASTPATH: */
- "LockFastPath",
- /* LWTRANCHE_BUFFER_MAPPING: */
- "BufferMapping",
- /* LWTRANCHE_LOCK_MANAGER: */
- "LockManager",
- /* LWTRANCHE_PREDICATE_LOCK_MANAGER: */
- "PredicateLockManager",
- /* LWTRANCHE_PARALLEL_HASH_JOIN: */
- "ParallelHashJoin",
- /* LWTRANCHE_PARALLEL_QUERY_DSA: */
- "ParallelQueryDSA",
- /* LWTRANCHE_PER_SESSION_DSA: */
- "PerSessionDSA",
- /* LWTRANCHE_PER_SESSION_RECORD_TYPE: */
- "PerSessionRecordType",
- /* LWTRANCHE_PER_SESSION_RECORD_TYPMOD: */
- "PerSessionRecordTypmod",
- /* LWTRANCHE_SHARED_TUPLESTORE: */
- "SharedTupleStore",
- /* LWTRANCHE_SHARED_TIDBITMAP: */
- "SharedTidBitmap",
- /* LWTRANCHE_PARALLEL_APPEND: */
- "ParallelAppend",
- /* LWTRANCHE_PER_XACT_PREDICATE_LIST: */
- "PerXactPredicateList",
- /* LWTRANCHE_PGSTATS_DSA: */
- "PgStatsDSA",
- /* LWTRANCHE_PGSTATS_HASH: */
- "PgStatsHash",
- /* LWTRANCHE_PGSTATS_DATA: */
- "PgStatsData",
- /* LWTRANCHE_LAUNCHER_DSA: */
- "LogicalRepLauncherDSA",
- /* LWTRANCHE_LAUNCHER_HASH: */
- "LogicalRepLauncherHash",
- /* LWTRANCHE_DSM_REGISTRY_DSA: */
- "DSMRegistryDSA",
- /* LWTRANCHE_DSM_REGISTRY_HASH: */
- "DSMRegistryHash",
+#include "lwlocknames.c"
+ [LWTRANCHE_XACT_BUFFER] = "XactBuffer",
+ [LWTRANCHE_COMMITTS_BUFFER] = "CommitTsBuffer",
+ [LWTRANCHE_SUBTRANS_BUFFER] = "SubtransBuffer",
+ [LWTRANCHE_MULTIXACTOFFSET_BUFFER] = "MultiXactOffsetBuffer",
+ [LWTRANCHE_MULTIXACTMEMBER_BUFFER] = "MultiXactMemberBuffer",
+ [LWTRANCHE_NOTIFY_BUFFER] = "NotifyBuffer",
+ [LWTRANCHE_SERIAL_BUFFER] = "SerialBuffer",
+ [LWTRANCHE_WAL_INSERT] = "WALInsert",
+ [LWTRANCHE_BUFFER_CONTENT] = "BufferContent",
+ [LWTRANCHE_REPLICATION_ORIGIN_STATE] = "ReplicationOriginState",
+ [LWTRANCHE_REPLICATION_SLOT_IO] = "ReplicationSlotIO",
+ [LWTRANCHE_LOCK_FASTPATH] = "LockFastPath",
+ [LWTRANCHE_BUFFER_MAPPING] = "BufferMapping",
+ [LWTRANCHE_LOCK_MANAGER] = "LockManager",
+ [LWTRANCHE_PREDICATE_LOCK_MANAGER] = "PredicateLockManager",
+ [LWTRANCHE_PARALLEL_HASH_JOIN] = "ParallelHashJoin",
+ [LWTRANCHE_PARALLEL_QUERY_DSA] = "ParallelQueryDSA",
+ [LWTRANCHE_PER_SESSION_DSA] = "PerSessionDSA",
+ [LWTRANCHE_PER_SESSION_RECORD_TYPE] = "PerSessionRecordType",
+ [LWTRANCHE_PER_SESSION_RECORD_TYPMOD] = "PerSessionRecordTypmod",
+ [LWTRANCHE_SHARED_TUPLESTORE] = "SharedTupleStore",
+ [LWTRANCHE_SHARED_TIDBITMAP] = "SharedTidBitmap",
+ [LWTRANCHE_PARALLEL_APPEND] = "ParallelAppend",
+ [LWTRANCHE_PER_XACT_PREDICATE_LIST] = "PerXactPredicateList",
+ [LWTRANCHE_PGSTATS_DSA] = "PgStatsDSA",
+ [LWTRANCHE_PGSTATS_HASH] = "PgStatsHash",
+ [LWTRANCHE_PGSTATS_DATA] = "PgStatsData",
+ [LWTRANCHE_LAUNCHER_DSA] = "LogicalRepLauncherDSA",
+ [LWTRANCHE_LAUNCHER_HASH] = "LogicalRepLauncherHash",
+ [LWTRANCHE_DSM_REGISTRY_DSA] = "DSMRegistryDSA",
+ [LWTRANCHE_DSM_REGISTRY_HASH] = "DSMRegistryHash",
};
StaticAssertDecl(lengthof(BuiltinTrancheNames) ==
- LWTRANCHE_FIRST_USER_DEFINED - NUM_INDIVIDUAL_LWLOCKS,
+ LWTRANCHE_FIRST_USER_DEFINED,
"missing entries in BuiltinTrancheNames[]");
/*
@@ -769,13 +737,9 @@ LWLockReportWaitEnd(void)
static const char *
GetLWTrancheName(uint16 trancheId)
{
- /* Individual LWLock? */
- if (trancheId < NUM_INDIVIDUAL_LWLOCKS)
- return IndividualLWLockNames[trancheId];
-
- /* Built-in tranche? */
+ /* Individual LWLock or built-in tranche? */
if (trancheId < LWTRANCHE_FIRST_USER_DEFINED)
- return BuiltinTrancheNames[trancheId - NUM_INDIVIDUAL_LWLOCKS];
+ return BuiltinTrancheNames[trancheId];
/*
* It's an extension tranche, so look in LWLockTrancheNames[]. However,
diff --git a/src/backend/storage/lmgr/meson.build b/src/backend/storage/lmgr/meson.build
index da32198f78..16a004202d 100644
--- a/src/backend/storage/lmgr/meson.build
+++ b/src/backend/storage/lmgr/meson.build
@@ -5,11 +5,17 @@ backend_sources += files(
'deadlock.c',
'lmgr.c',
'lock.c',
- 'lwlock.c',
'predicate.c',
'proc.c',
's_lock.c',
'spin.c',
)
-generated_backend_sources += lwlocknames[1]
+# this includes a .c file generated. Is there a better way?
+lwlock = static_library('lwlock',
+ files('lwlock.c'),
+ dependencies: [backend_code],
+ include_directories: include_directories('../../../include/storage'),
+ kwargs: internal_lib_args,
+ )
+backend_link_with += lwlock
--
2.39.2
