Spelling adjustments

src/backend/storage/ipc/latch.c

@@ -1354,7 +1354,7 @@ WaitEventSetWaitBlock(WaitEventSet *set, int cur_timeout,
 			 * because we don't expect the pipe to become readable or to have
 			 * any errors either, treat those cases as postmaster death, too.
 			 *
-			 * Be paranoid about a spurious event signalling the postmaster as
+			 * Be paranoid about a spurious event signaling the postmaster as
 			 * being dead.  There have been reports about that happening with
 			 * older primitives (select(2) to be specific), and a spurious
 			 * WL_POSTMASTER_DEATH event would be painful. Re-checking doesn't
@@ -1613,7 +1613,7 @@ WaitEventSetWaitBlock(WaitEventSet *set, int cur_timeout,
 			 * we don't expect the pipe to become readable or to have any
 			 * errors either, treat those cases as postmaster death, too.
 			 *
-			 * Be paranoid about a spurious event signalling the postmaster as
+			 * Be paranoid about a spurious event signaling the postmaster as
 			 * being dead.  There have been reports about that happening with
 			 * older primitives (select(2) to be specific), and a spurious
 			 * WL_POSTMASTER_DEATH event would be painful. Re-checking doesn't

src/backend/storage/ipc/procsignal.c

@@ -1,7 +1,7 @@
 /*-------------------------------------------------------------------------
  *
  * procsignal.c
- *	  Routines for interprocess signalling
+ *	  Routines for interprocess signaling
  *
  *
  * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
@@ -30,7 +30,7 @@
 #include "tcop/tcopprot.h"
 
 /*
- * The SIGUSR1 signal is multiplexed to support signalling multiple event
+ * The SIGUSR1 signal is multiplexed to support signaling multiple event
  * types. The specific reason is communicated via flags in shared memory.
  * We keep a boolean flag for each possible "reason", so that different
  * reasons can be signaled to a process concurrently.  (However, if the same
@@ -40,8 +40,8 @@
  * Each process that wants to receive signals registers its process ID
  * in the ProcSignalSlots array. The array is indexed by backend ID to make
  * slot allocation simple, and to avoid having to search the array when you
- * know the backend ID of the process you're signalling.  (We do support
- * signalling without backend ID, but it's a bit less efficient.)
+ * know the backend ID of the process you're signaling.  (We do support
+ * signaling without backend ID, but it's a bit less efficient.)
  *
  * The flags are actually declared as "volatile sig_atomic_t" for maximum
  * portability.  This should ensure that loads and stores of the flag
@@ -420,7 +420,7 @@ WaitForProcSignalBarrier(uint64 generation)
 /*
  * Perform global barrier related interrupt checking.
  *
- * Any backend that participates in ProcSignal signalling must arrange to
+ * Any backend that participates in ProcSignal signaling must arrange to
  * call this function periodically. It is called from CHECK_FOR_INTERRUPTS(),
  * which is enough for normal backends, but not necessarily for all types of
  * background processes.

src/backend/storage/ipc/shm_mq.c

@@ -1182,7 +1182,7 @@ shm_mq_wait_internal(shm_mq *mq, PGPROC **ptr, BackgroundWorkerHandle *handle)
 			}
 		}
 
-		/* Wait to be signalled. */
+		/* Wait to be signaled. */
 		(void) WaitLatch(MyLatch, WL_LATCH_SET | WL_EXIT_ON_PM_DEATH, 0,
 						 WAIT_EVENT_MQ_INTERNAL);
 

src/backend/storage/ipc/signalfuncs.c

@@ -1,7 +1,7 @@
 /*-------------------------------------------------------------------------
  *
  * signalfuncs.c
- *	  Functions for signalling backends
+ *	  Functions for signaling backends
  *
  * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California

src/backend/storage/ipc/standby.c

@@ -92,7 +92,7 @@ InitRecoveryTransactionEnvironment(void)
 	/*
 	 * Initialize shared invalidation management for Startup process, being
 	 * careful to register ourselves as a sendOnly process so we don't need to
-	 * read messages, nor will we get signalled when the queue starts filling
+	 * read messages, nor will we get signaled when the queue starts filling
 	 * up.
 	 */
 	SharedInvalBackendInit(true);

src/backend/storage/lmgr/lock.c

@@ -759,7 +759,7 @@ LockAcquire(const LOCKTAG *locktag,
  * reportMemoryError specifies whether a lock request that fills the lock
  * table should generate an ERROR or not.  Passing "false" allows the caller
  * to attempt to recover from lock-table-full situations, perhaps by forcibly
- * cancelling other lock holders and then retrying.  Note, however, that the
+ * canceling other lock holders and then retrying.  Note, however, that the
  * return code for that is LOCKACQUIRE_NOT_AVAIL, so that it's unsafe to use
  * in combination with dontWait = true, as the cause of failure couldn't be
  * distinguished.