Fix Windows build, remove some warnings, try to fix atomic alignment issues on Win32

Author: ololobus

engine.c

@@ -253,7 +253,7 @@ ptrackMapInit(void)
 	}
 	else
 	{
-		strncat(ptrack_map->magic, PTRACK_MAGIC, 3);
+		memcpy(ptrack_map->magic, PTRACK_MAGIC, PTRACK_MAGIC_SIZE);
 		ptrack_map->version_num = PTRACK_VERSION_NUM;
 	}
 
@@ -639,9 +639,13 @@ ptrack_mark_block(RelFileNodeBackend smgr_rnode,
 {
 	size_t		hash;
 	XLogRecPtr	new_lsn;
-	XLogRecPtr	old_lsn;
-	XLogRecPtr	old_init_lsn;
 	PtBlockId	bid;
+	/*
+	 * We use pg_atomic_uint64 here only for alignment purposes, because
+	 * pg_atomic_uint64 is forcely aligned on 8 bytes during the MSVC build.
+	 */
+	pg_atomic_uint64	old_lsn;
+	pg_atomic_uint64	old_init_lsn;
 
 	if (ptrack_map_size != 0 && (ptrack_map != NULL) &&
 		smgr_rnode.backend == InvalidBackendId) /* do not track temporary
@@ -657,24 +661,24 @@ ptrack_mark_block(RelFileNodeBackend smgr_rnode,
 		else
 			new_lsn = GetXLogInsertRecPtr();
 
-		old_lsn = pg_atomic_read_u64(&ptrack_map->entries[hash]);
+		old_lsn.value = pg_atomic_read_u64(&ptrack_map->entries[hash]);
 
 		/* Atomically assign new init LSN value */
-		old_init_lsn = pg_atomic_read_u64(&ptrack_map->init_lsn);
+		old_init_lsn.value = pg_atomic_read_u64(&ptrack_map->init_lsn);
 
-		if (old_init_lsn == InvalidXLogRecPtr)
+		if (old_init_lsn.value == InvalidXLogRecPtr)
 		{
-			elog(DEBUG1, "ptrack_mark_block: init_lsn " UINT64_FORMAT " <- " UINT64_FORMAT, old_init_lsn, new_lsn);
+			elog(DEBUG1, "ptrack_mark_block: init_lsn " UINT64_FORMAT " <- " UINT64_FORMAT, old_init_lsn.value, new_lsn);
 
-			while (old_init_lsn < new_lsn &&
-				   !pg_atomic_compare_exchange_u64(&ptrack_map->init_lsn, &old_init_lsn, new_lsn));
+			while (old_init_lsn.value < new_lsn &&
+				   !pg_atomic_compare_exchange_u64(&ptrack_map->init_lsn, (uint64 *) &old_init_lsn.value, new_lsn));
 		}
 
-		elog(DEBUG3, "ptrack_mark_block: map[%zu]=" UINT64_FORMAT " <- " UINT64_FORMAT, hash, old_lsn, new_lsn);
+		elog(DEBUG3, "ptrack_mark_block: map[%zu]=" UINT64_FORMAT " <- " UINT64_FORMAT, hash, old_lsn.value, new_lsn);
 
 		/* Atomically assign new LSN value */
-		while (old_lsn < new_lsn &&
-			   !pg_atomic_compare_exchange_u64(&ptrack_map->entries[hash], &old_lsn, new_lsn));
+		while (old_lsn.value < new_lsn &&
+			   !pg_atomic_compare_exchange_u64(&ptrack_map->entries[hash], (uint64 *) &old_lsn.value, new_lsn));
 		elog(DEBUG3, "ptrack_mark_block: map[%zu]=" UINT64_FORMAT, hash, pg_atomic_read_u64(&ptrack_map->entries[hash]));
 	}
 }

engine.h

@@ -33,6 +33,10 @@
 
 #define PTRACK_BUF_SIZE 1000
 
+/* Ptrack magic bytes */
+#define PTRACK_MAGIC "ptk"
+#define PTRACK_MAGIC_SIZE 4
+
 /*
  * Header of ptrack map.
  */
@@ -42,7 +46,7 @@ typedef struct PtrackMapHdr
 	 * Three magic bytes (+ \0) to be sure, that we are reading ptrack.map
 	 * with a right PtrackMapHdr strucutre.
 	 */
-	char		magic[4];
+	char		magic[PTRACK_MAGIC_SIZE];
 
 	/*
 	 * Value of PTRACK_VERSION_NUM at the time of map initialization.

patches/REL_12_STABLE-ptrack-core.diff

@@ -85,7 +85,7 @@ index 050cee5f9a9..75cf67d464f 100644
 
  /*
 diff --git a/src/backend/storage/sync/sync.c b/src/backend/storage/sync/sync.c
-index 705f229b27f..bec4af88810 100644
+index aff3e885f36..4fffa5df17c 100644
 --- a/src/backend/storage/sync/sync.c
 +++ b/src/backend/storage/sync/sync.c
 @@ -75,6 +75,8 @@ static MemoryContext pendingOpsCxt; /* context for the above  */
@@ -97,7 +97,7 @@ index 705f229b27f..bec4af88810 100644
  /* Intervals for calling AbsorbSyncRequests */
  #define FSYNCS_PER_ABSORB		10
  #define UNLINKS_PER_ABSORB		10
-@@ -418,6 +420,9 @@ ProcessSyncRequests(void)
+@@ -420,6 +422,9 @@ ProcessSyncRequests(void)
  	CheckpointStats.ckpt_longest_sync = longest;
  	CheckpointStats.ckpt_agg_sync_time = total_elapsed;
 
@@ -224,6 +224,37 @@ index 56f83d2fb2f..60bb7bf7a3b 100644
  	/* end of list */
  	{NULL, false}
  };
+diff --git a/src/include/miscadmin.h b/src/include/miscadmin.h
+index 61a24c2e3c6..cbd46d0cb02 100644
+--- a/src/include/miscadmin.h
++++ b/src/include/miscadmin.h
+@@ -369,7 +369,7 @@ typedef enum ProcessingMode
+ 	NormalProcessing			/* normal processing */
+ } ProcessingMode;
+ 
+-extern ProcessingMode Mode;
++extern PGDLLIMPORT ProcessingMode Mode;
+ 
+ #define IsBootstrapProcessingMode() (Mode == BootstrapProcessing)
+ #define IsInitProcessingMode()		(Mode == InitProcessing)
+diff --git a/src/include/port/pg_crc32c.h b/src/include/port/pg_crc32c.h
+index fbd079d2439..01682035e0b 100644
+--- a/src/include/port/pg_crc32c.h
++++ b/src/include/port/pg_crc32c.h
+@@ -69,8 +69,11 @@ extern pg_crc32c pg_comp_crc32c_armv8(pg_crc32c crc, const void *data, size_t le
+ #define FIN_CRC32C(crc) ((crc) ^= 0xFFFFFFFF)
+ 
+ extern pg_crc32c pg_comp_crc32c_sb8(pg_crc32c crc, const void *data, size_t len);
+-extern pg_crc32c (*pg_comp_crc32c) (pg_crc32c crc, const void *data, size_t len);
+-
++extern
++#ifndef FRONTEND
++PGDLLIMPORT
++#endif
++pg_crc32c (*pg_comp_crc32c) (pg_crc32c crc, const void *data, size_t len);
+ #ifdef USE_SSE42_CRC32C_WITH_RUNTIME_CHECK
+ extern pg_crc32c pg_comp_crc32c_sse42(pg_crc32c crc, const void *data, size_t len);
+ #endif
 diff --git a/src/include/storage/copydir.h b/src/include/storage/copydir.h
 index 525cc6203e1..9481e1c5a88 100644
 --- a/src/include/storage/copydir.h

ptrack.h

@@ -25,8 +25,6 @@
 #define PTRACK_VERSION "2.1"
 /* Ptrack version as a number */
 #define PTRACK_VERSION_NUM 210
-/* Ptrack magic bytes */
-#define PTRACK_MAGIC "ptk"
 
 /*
  * Structure identifying block on the disk.