Rename some shared memory initialization routines

To make them follow the usual naming convention where
FoobarShmemSize() calculates the amount of shared memory needed by
Foobar subsystem, and FoobarShmemInit() performs the initialization.

I didn't rename CreateLWLocks() and InitShmmeIndex(), because they are
a little special. They need to be called before any of the other
ShmemInit() functions, because they set up the shared memory
bookkeeping itself. I also didn't rename InitProcGlobal(), because
unlike other Shmeminit functions, it's not called by individual
backends.

Reviewed-by: Andreas Karlsson
Discussion: https://www.postgresql.org/message-id/c09694ff-2453-47e5-b26c-32a16cd75ce6@iki.fi

src/backend/storage/buffer/buf_init.c

@@ -65,7 +65,7 @@ CkptSortItem *CkptBufferIds;
  * postmaster, or in a standalone backend).
  */
 void
-InitBufferPool(void)
+BufferManagerShmemInit(void)
 {
 	bool		foundBufs,
 				foundDescs,
@@ -151,13 +151,13 @@ InitBufferPool(void)
 }
 
 /*
- * BufferShmemSize
+ * BufferManagerShmemSize
  *
  * compute the size of shared memory for the buffer pool including
  * data pages, buffer descriptors, hash tables, etc.
  */
 Size
-BufferShmemSize(void)
+BufferManagerShmemSize(void)
 {
 	Size		size = 0;
 

src/backend/storage/buffer/bufmgr.c

@@ -3582,7 +3582,7 @@ AtEOXact_Buffers(bool isCommit)
  * buffer pool.
  */
 void
-InitBufferPoolAccess(void)
+InitBufferManagerAccess(void)
 {
 	HASHCTL		hash_ctl;
 

src/backend/storage/buffer/freelist.c

@@ -506,7 +506,7 @@ StrategyInitialize(bool init)
 
 		/*
 		 * Grab the whole linked list of free buffers for our strategy. We
-		 * assume it was previously set up by InitBufferPool().
+		 * assume it was previously set up by BufferManagerShmemInit().
 		 */
 		StrategyControl->firstFreeBuffer = 0;
 		StrategyControl->lastFreeBuffer = NBuffers - 1;

src/backend/storage/ipc/ipci.c

@@ -115,7 +115,7 @@ CalculateShmemSize(int *num_semaphores)
 											 sizeof(ShmemIndexEnt)));
 	size = add_size(size, dsm_estimate_size());
 	size = add_size(size, DSMRegistryShmemSize());
-	size = add_size(size, BufferShmemSize());
+	size = add_size(size, BufferManagerShmemSize());
 	size = add_size(size, LockManagerShmemSize());
 	size = add_size(size, PredicateLockShmemSize());
 	size = add_size(size, ProcGlobalShmemSize());
@@ -132,7 +132,7 @@ CalculateShmemSize(int *num_semaphores)
 	size = add_size(size, LWLockShmemSize());
 	size = add_size(size, ProcArrayShmemSize());
 	size = add_size(size, BackendStatusShmemSize());
-	size = add_size(size, SInvalShmemSize());
+	size = add_size(size, SharedInvalShmemSize());
 	size = add_size(size, PMSignalShmemSize());
 	size = add_size(size, ProcSignalShmemSize());
 	size = add_size(size, CheckpointerShmemSize());
@@ -286,7 +286,7 @@ CreateOrAttachShmemStructs(void)
 	CommitTsShmemInit();
 	SUBTRANSShmemInit();
 	MultiXactShmemInit();
-	InitBufferPool();
+	BufferManagerShmemInit();
 
 	/*
 	 * Set up lock manager
@@ -296,22 +296,22 @@ CreateOrAttachShmemStructs(void)
 	/*
 	 * Set up predicate lock manager
 	 */
-	InitPredicateLocks();
+	PredicateLockShmemInit();
 
 	/*
 	 * Set up process table
 	 */
 	if (!IsUnderPostmaster)
 		InitProcGlobal();
-	CreateSharedProcArray();
-	CreateSharedBackendStatus();
+	ProcArrayShmemInit();
+	BackendStatusShmemInit();
 	TwoPhaseShmemInit();
 	BackgroundWorkerShmemInit();
 
 	/*
 	 * Set up shared-inval messaging
 	 */
-	CreateSharedInvalidationState();
+	SharedInvalShmemInit();
 
 	/*
 	 * Set up interprocess signaling mechanisms

src/backend/storage/ipc/procarray.c

@@ -370,7 +370,7 @@ static inline FullTransactionId FullXidRelativeTo(FullTransactionId rel,
 static void GlobalVisUpdateApply(ComputeXidHorizonsResult *horizons);
 
 /*
- * Report shared-memory space needed by CreateSharedProcArray.
+ * Report shared-memory space needed by ProcArrayShmemInit
  */
 Size
 ProcArrayShmemSize(void)
@@ -415,7 +415,7 @@ ProcArrayShmemSize(void)
  * Initialize the shared PGPROC array during postmaster startup.
  */
 void
-CreateSharedProcArray(void)
+ProcArrayShmemInit(void)
 {
 	bool		found;
 

src/backend/storage/ipc/sinvaladt.c

@@ -212,10 +212,10 @@ static void CleanupInvalidationState(int status, Datum arg);
 
 
 /*
- * SInvalShmemSize --- return shared-memory space needed
+ * SharedInvalShmemSize --- return shared-memory space needed
  */
 Size
-SInvalShmemSize(void)
+SharedInvalShmemSize(void)
 {
 	Size		size;
 
@@ -227,18 +227,18 @@ SInvalShmemSize(void)
 }
 
 /*
- * CreateSharedInvalidationState
+ * SharedInvalShmemInit
  *		Create and initialize the SI message buffer
  */
 void
-CreateSharedInvalidationState(void)
+SharedInvalShmemInit(void)
 {
 	int			i;
 	bool		found;
 
 	/* Allocate space in shared memory */
 	shmInvalBuffer = (SISeg *)
-		ShmemInitStruct("shmInvalBuffer", SInvalShmemSize(), &found);
+		ShmemInitStruct("shmInvalBuffer", SharedInvalShmemSize(), &found);
 	if (found)
 		return;
 

src/backend/storage/lmgr/predicate.c

@@ -153,7 +153,7 @@
  * INTERFACE ROUTINES
  *
  * housekeeping for setting up shared memory predicate lock structures
- *		InitPredicateLocks(void)
+ *		PredicateLockShmemInit(void)
  *		PredicateLockShmemSize(void)
  *
  * predicate lock reporting
@@ -1127,7 +1127,7 @@ CheckPointPredicate(void)
 /*------------------------------------------------------------------------*/
 
 /*
- * InitPredicateLocks -- Initialize the predicate locking data structures.
+ * PredicateLockShmemInit -- Initialize the predicate locking data structures.
  *
  * This is called from CreateSharedMemoryAndSemaphores(), which see for
  * more comments.  In the normal postmaster case, the shared hash tables
@@ -1137,7 +1137,7 @@ CheckPointPredicate(void)
  * shared hash tables.
  */
 void
-InitPredicateLocks(void)
+PredicateLockShmemInit(void)
 {
 	HASHCTL		info;
 	long		max_table_size;

src/backend/utils/activity/backend_status.c

@@ -77,7 +77,7 @@ static void pgstat_setup_backend_status_context(void);
 
 
 /*
- * Report shared-memory space needed by CreateSharedBackendStatus.
+ * Report shared-memory space needed by BackendStatusShmemInit.
  */
 Size
 BackendStatusShmemSize(void)
@@ -113,7 +113,7 @@ BackendStatusShmemSize(void)
  * during postmaster startup.
  */
 void
-CreateSharedBackendStatus(void)
+BackendStatusShmemInit(void)
 {
 	Size		size;
 	bool		found;

src/backend/utils/init/postinit.c

@@ -592,7 +592,7 @@ BaseInit(void)
 	/* Do local initialization of storage and buffer managers */
 	InitSync();
 	smgrinit();
-	InitBufferPoolAccess();
+	InitBufferManagerAccess();
 
 	/*
 	 * Initialize temporary file access after pgstat, so that the temporary

src/include/storage/bufmgr.h

@@ -249,7 +249,7 @@ extern Buffer ExtendBufferedRelTo(BufferManagerRelation bmr,
 								  BlockNumber extend_to,
 								  ReadBufferMode mode);
 
-extern void InitBufferPoolAccess(void);
+extern void InitBufferManagerAccess(void);
 extern void AtEOXact_Buffers(bool isCommit);
 extern char *DebugPrintBufferRefcount(Buffer buffer);
 extern void CheckPointBuffers(int flags);
@@ -300,8 +300,8 @@ extern void LimitAdditionalLocalPins(uint32 *additional_pins);
 extern bool EvictUnpinnedBuffer(Buffer buf);
 
 /* in buf_init.c */
-extern void InitBufferPool(void);
-extern Size BufferShmemSize(void);
+extern void BufferManagerShmemInit(void);
+extern Size BufferManagerShmemSize(void);
 
 /* in localbuf.c */
 extern void AtProcExit_LocalBuffers(void);

src/include/storage/predicate.h

@@ -37,7 +37,7 @@ typedef void *SerializableXactHandle;
  */
 
 /* housekeeping for shared memory predicate lock structures */
-extern void InitPredicateLocks(void);
+extern void PredicateLockShmemInit(void);
 extern Size PredicateLockShmemSize(void);
 
 extern void CheckPointPredicate(void);

src/include/storage/procarray.h

@@ -21,7 +21,7 @@
 
 
 extern Size ProcArrayShmemSize(void);
-extern void CreateSharedProcArray(void);
+extern void ProcArrayShmemInit(void);
 extern void ProcArrayAdd(PGPROC *proc);
 extern void ProcArrayRemove(PGPROC *proc, TransactionId latestXid);
 

src/include/storage/sinvaladt.h

@@ -28,8 +28,8 @@
 /*
  * prototypes for functions in sinvaladt.c
  */
-extern Size SInvalShmemSize(void);
-extern void CreateSharedInvalidationState(void);
+extern Size SharedInvalShmemSize(void);
+extern void SharedInvalShmemInit(void);
 extern void SharedInvalBackendInit(bool sendOnly);
 
 extern void SIInsertDataEntries(const SharedInvalidationMessage *data, int n);

src/include/utils/backend_status.h

@@ -299,7 +299,7 @@ extern PGDLLIMPORT PgBackendStatus *MyBEEntry;
  * ----------
  */
 extern Size BackendStatusShmemSize(void);
-extern void CreateSharedBackendStatus(void);
+extern void BackendStatusShmemInit(void);
 
 
 /* ----------