From f575da0fedc920003afb4655f3503cc91949cc55 Mon Sep 17 00:00:00 2001
From: Peter Eisentraut <peter@eisentraut.org>
Date: Sun, 29 Dec 2019 09:09:20 +0100
Subject: [PATCH 1/4] Remove STATUS_FOUND

Replace the solitary use with a bool.
---
 src/backend/storage/lmgr/lock.c | 24 +++++++++++-------------
 src/backend/storage/lmgr/proc.c | 12 ++++--------
 src/include/c.h                 |  1 -
 src/include/storage/lock.h      |  2 +-
 4 files changed, 16 insertions(+), 23 deletions(-)

diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c
index 9089733ecc..e2c728a97d 100644
--- a/src/backend/storage/lmgr/lock.c
+++ b/src/backend/storage/lmgr/lock.c
@@ -746,7 +746,7 @@ LockAcquireExtended(const LOCKTAG *locktag,
 	ResourceOwner owner;
 	uint32		hashcode;
 	LWLock	   *partitionLock;
-	int			status;
+	bool		found_conflict;
 	bool		log_lock = false;
 
 	if (lockmethodid <= 0 || lockmethodid >= lengthof(LockMethods))
@@ -979,12 +979,12 @@ LockAcquireExtended(const LOCKTAG *locktag,
 	 * (That's last because most complex check.)
 	 */
 	if (lockMethodTable->conflictTab[lockmode] & lock->waitMask)
-		status = STATUS_FOUND;
+		found_conflict = true;
 	else
-		status = LockCheckConflicts(lockMethodTable, lockmode,
+		found_conflict = LockCheckConflicts(lockMethodTable, lockmode,
 									lock, proclock);
 
-	if (status == STATUS_OK)
+	if (!found_conflict)
 	{
 		/* No conflict with held or previously requested locks */
 		GrantLock(lock, proclock, lockmode);
@@ -992,8 +992,6 @@ LockAcquireExtended(const LOCKTAG *locktag,
 	}
 	else
 	{
-		Assert(status == STATUS_FOUND);
-
 		/*
 		 * We can't acquire the lock immediately.  If caller specified no
 		 * blocking, remove useless table entries and return
@@ -1330,7 +1328,7 @@ RemoveLocalLock(LOCALLOCK *locallock)
  * LockCheckConflicts -- test whether requested lock conflicts
  *		with those already granted
  *
- * Returns STATUS_FOUND if conflict, STATUS_OK if no conflict.
+ * Returns true if conflict, false if no conflict.
  *
  * NOTES:
  *		Here's what makes this complicated: one process's locks don't
@@ -1340,7 +1338,7 @@ RemoveLocalLock(LOCALLOCK *locallock)
  * the same group.  So, we must subtract off these locks when determining
  * whether the requested new lock conflicts with those already held.
  */
-int
+bool
 LockCheckConflicts(LockMethod lockMethodTable,
 				   LOCKMODE lockmode,
 				   LOCK *lock,
@@ -1367,7 +1365,7 @@ LockCheckConflicts(LockMethod lockMethodTable,
 	if (!(conflictMask & lock->grantMask))
 	{
 		PROCLOCK_PRINT("LockCheckConflicts: no conflict", proclock);
-		return STATUS_OK;
+		return false;
 	}
 
 	/*
@@ -1393,7 +1391,7 @@ LockCheckConflicts(LockMethod lockMethodTable,
 	if (totalConflictsRemaining == 0)
 	{
 		PROCLOCK_PRINT("LockCheckConflicts: resolved (simple)", proclock);
-		return STATUS_OK;
+		return false;
 	}
 
 	/* If no group locking, it's definitely a conflict. */
@@ -1402,7 +1400,7 @@ LockCheckConflicts(LockMethod lockMethodTable,
 		Assert(proclock->tag.myProc == MyProc);
 		PROCLOCK_PRINT("LockCheckConflicts: conflicting (simple)",
 					   proclock);
-		return STATUS_FOUND;
+		return true;
 	}
 
 	/*
@@ -1439,7 +1437,7 @@ LockCheckConflicts(LockMethod lockMethodTable,
 			{
 				PROCLOCK_PRINT("LockCheckConflicts: resolved (group)",
 							   proclock);
-				return STATUS_OK;
+				return false;
 			}
 		}
 		otherproclock = (PROCLOCK *)
@@ -1449,7 +1447,7 @@ LockCheckConflicts(LockMethod lockMethodTable,
 
 	/* Nope, it's a real conflict. */
 	PROCLOCK_PRINT("LockCheckConflicts: conflicting (group)", proclock);
-	return STATUS_FOUND;
+	return true;
 }
 
 /*
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c
index fff0628e58..dbb541757f 100644
--- a/src/backend/storage/lmgr/proc.c
+++ b/src/backend/storage/lmgr/proc.c
@@ -1149,10 +1149,8 @@ ProcSleep(LOCALLOCK *locallock, LockMethod lockMethodTable)
 				}
 				/* I must go before this waiter.  Check special case. */
 				if ((lockMethodTable->conflictTab[lockmode] & aheadRequests) == 0 &&
-					LockCheckConflicts(lockMethodTable,
-									   lockmode,
-									   lock,
-									   proclock) == STATUS_OK)
+					!LockCheckConflicts(lockMethodTable, lockmode, lock,
+										proclock))
 				{
 					/* Skip the wait and just grant myself the lock. */
 					GrantLock(lock, proclock, lockmode);
@@ -1648,10 +1646,8 @@ ProcLockWakeup(LockMethod lockMethodTable, LOCK *lock)
 		 * (b) doesn't conflict with already-held locks.
 		 */
 		if ((lockMethodTable->conflictTab[lockmode] & aheadRequests) == 0 &&
-			LockCheckConflicts(lockMethodTable,
-							   lockmode,
-							   lock,
-							   proc->waitProcLock) == STATUS_OK)
+			!LockCheckConflicts(lockMethodTable, lockmode, lock,
+								proc->waitProcLock))
 		{
 			/* OK to waken */
 			GrantLock(lock, proc->waitProcLock, lockmode);
diff --git a/src/include/c.h b/src/include/c.h
index 00e41ac546..eddeb36ca1 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -1120,7 +1120,6 @@ typedef union PGAlignedXLogBlock
 #define STATUS_OK				(0)
 #define STATUS_ERROR			(-1)
 #define STATUS_EOF				(-2)
-#define STATUS_FOUND			(1)
 #define STATUS_WAITING			(2)
 
 /*
diff --git a/src/include/storage/lock.h b/src/include/storage/lock.h
index e8b50fe094..7978fcf216 100644
--- a/src/include/storage/lock.h
+++ b/src/include/storage/lock.h
@@ -550,7 +550,7 @@ extern VirtualTransactionId *GetLockConflicts(const LOCKTAG *locktag,
 											  LOCKMODE lockmode, int *countp);
 extern void AtPrepare_Locks(void);
 extern void PostPrepare_Locks(TransactionId xid);
-extern int	LockCheckConflicts(LockMethod lockMethodTable,
+extern bool LockCheckConflicts(LockMethod lockMethodTable,
 							   LOCKMODE lockmode,
 							   LOCK *lock, PROCLOCK *proclock);
 extern void GrantLock(LOCK *lock, PROCLOCK *proclock, LOCKMODE lockmode);
-- 
2.24.1