MDEV-17441 - InnoDB transition to C++11 atomics

fil_validate_count transition to Atomic_counter.

Author: svoj

storage/innobase/fil/fil0fil.cc

@@ -204,19 +204,11 @@ fil_validate_skip(void)
 /*===================*/
 {
 	/** The fil_validate() call skip counter. */
-	static int fil_validate_count = FIL_VALIDATE_SKIP;
+	static Atomic_counter<uint32_t> fil_validate_count;
 
 	/* We want to reduce the call frequency of the costly fil_validate()
 	check in debug builds. */
-	int count = my_atomic_add32_explicit(&fil_validate_count, -1,
-					     MY_MEMORY_ORDER_RELAXED);
-	if (count > 0) {
-		return(true);
-	}
-
-	my_atomic_store32_explicit(&fil_validate_count, FIL_VALIDATE_SKIP,
-				   MY_MEMORY_ORDER_RELAXED);
-	return(fil_validate());
+	return (fil_validate_count++ % FIL_VALIDATE_SKIP) || fil_validate();
 }
 #endif /* UNIV_DEBUG */
 

storage/innobase/include/dict0dict.h

@@ -31,7 +31,6 @@ Created 1/8/1996 Heikki Tuuri
 #include "data0data.h"
 #include "dict0mem.h"
 #include "fsp0fsp.h"
-#include <atomic>
 #include <deque>
 
 extern bool innodb_table_stats_not_found;

storage/innobase/include/univ.i

@@ -83,6 +83,7 @@ used throughout InnoDB but do not include too much themselves.  They
 support cross-platform development and expose comonly used SQL names. */
 
 #include <my_global.h>
+#include "my_counter.h"
 
 /* JAN: TODO: missing 5.7 header */
 #ifdef HAVE_MY_THREAD_H

storage/innobase/include/ut0counter.h

@@ -29,7 +29,6 @@ Created 2012/04/12 by Sunny Bains
 #define ut0counter_h
 
 #include "os0thread.h"
-#include <atomic>
 #include "my_rdtsc.h"
 
 /** CPU cache line size */