5.6.24

storage/innobase/include/dict0mem.h

@@ -1,6 +1,6 @@
 /*****************************************************************************
 
-Copyright (c) 1996, 2014, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 1996, 2015, Oracle and/or its affiliates. All Rights Reserved.
 Copyright (c) 2012, Facebook Inc.
 
 This program is free software; you can redistribute it and/or modify it under
@@ -540,11 +540,12 @@ extern ulong	zip_failure_threshold_pct;
 compression failures */
 extern ulong	zip_pad_max;
 
-/** Data structure to hold information about about how much space in
+/** Data structure to hold information about how much space in
 an uncompressed page should be left as padding to avoid compression
 failures. This estimate is based on a self-adapting heuristic. */
 struct zip_pad_info_t {
-	os_fast_mutex_t	mutex;	/*!< mutex protecting the info */
+	os_fast_mutex_t*
+			mutex;	/*!< mutex protecting the info */
 	ulint		pad;	/*!< number of bytes used as pad */
 	ulint		success;/*!< successful compression ops during
 				current round */
@@ -552,6 +553,9 @@ struct zip_pad_info_t {
 				current round */
 	ulint		n_rounds;/*!< number of currently successful
 				rounds */
+	volatile os_once::state_t
+			mutex_created;
+				/*!< Creation state of mutex member */
 };
 
 /** Data structure for an index.  Most fields will be
@@ -1142,9 +1146,14 @@ struct dict_table_t{
 				space from the lock heap of the trx:
 				otherwise the lock heap would grow rapidly
 				if we do a large insert from a select */
-	ib_mutex_t		autoinc_mutex;
+	ib_mutex_t*	autoinc_mutex;
 				/*!< mutex protecting the autoincrement
 				counter */
+
+	/** Creation state of autoinc_mutex member */
+	volatile os_once::state_t
+			autoinc_mutex_created;
+
 	ib_uint64_t	autoinc;/*!< autoinc counter value to give to the
 				next inserted row */
 	ulong		n_waiting_or_granted_auto_inc_locks;
@@ -1207,6 +1216,111 @@ struct dict_foreign_add_to_referenced_table {
 	}
 };
 
+/** Destroy the autoinc latch of the given table.
+This function is only called from either single threaded environment
+or from a thread that has not shared the table object with other threads.
+@param[in,out]	table	table whose stats latch to destroy */
+inline
+void
+dict_table_autoinc_destroy(
+	dict_table_t*	table)
+{
+	if (table->autoinc_mutex_created == os_once::DONE
+	    && table->autoinc_mutex != NULL) {
+		mutex_free(table->autoinc_mutex);
+		delete table->autoinc_mutex;
+	}
+}
+
+/** Allocate and init the autoinc latch of a given table.
+This function must not be called concurrently on the same table object.
+@param[in,out]	table_void	table whose autoinc latch to create */
+void
+dict_table_autoinc_alloc(
+	void*	table_void);
+
+/** Allocate and init the zip_pad_mutex of a given index.
+This function must not be called concurrently on the same index object.
+@param[in,out]	index_void	index whose zip_pad_mutex to create */
+void
+dict_index_zip_pad_alloc(
+	void*	index_void);
+
+/** Request for lazy creation of the autoinc latch of a given table.
+This function is only called from either single threaded environment
+or from a thread that has not shared the table object with other threads.
+@param[in,out]	table	table whose autoinc latch is to be created. */
+inline
+void
+dict_table_autoinc_create_lazy(
+	dict_table_t*	table)
+{
+#ifdef HAVE_ATOMIC_BUILTINS
+	table->autoinc_mutex = NULL;
+	table->autoinc_mutex_created = os_once::NEVER_DONE;
+#else /* HAVE_ATOMIC_BUILTINS */
+	dict_table_autoinc_alloc(table);
+	table->autoinc_mutex_created = os_once::DONE;
+#endif /* HAVE_ATOMIC_BUILTINS */
+}
+
+/** Request a lazy creation of dict_index_t::zip_pad::mutex.
+This function is only called from either single threaded environment
+or from a thread that has not shared the table object with other threads.
+@param[in,out]	index	index whose zip_pad mutex is to be created */
+inline
+void
+dict_index_zip_pad_mutex_create_lazy(
+	dict_index_t*	index)
+{
+#ifdef HAVE_ATOMIC_BUILTINS
+	index->zip_pad.mutex = NULL;
+	index->zip_pad.mutex_created = os_once::NEVER_DONE;
+#else /* HAVE_ATOMIC_BUILTINS */
+	dict_index_zip_pad_alloc(index);
+	index->zip_pad.mutex_created = os_once::DONE;
+#endif /* HAVE_ATOMIC_BUILTINS */
+}
+
+/** Destroy the zip_pad_mutex of the given index.
+This function is only called from either single threaded environment
+or from a thread that has not shared the table object with other threads.
+@param[in,out]	table	table whose stats latch to destroy */
+inline
+void
+dict_index_zip_pad_mutex_destroy(
+	dict_index_t*	index)
+{
+	if (index->zip_pad.mutex_created == os_once::DONE
+	    && index->zip_pad.mutex != NULL) {
+		os_fast_mutex_free(index->zip_pad.mutex);
+		delete index->zip_pad.mutex;
+	}
+}
+
+/** Release the zip_pad_mutex of a given index.
+@param[in,out]	index	index whose zip_pad_mutex is to be released */
+inline
+void
+dict_index_zip_pad_unlock(
+	dict_index_t*	index)
+{
+	os_fast_mutex_unlock(index->zip_pad.mutex);
+}
+
+#ifdef UNIV_DEBUG
+/** Check if the current thread owns the autoinc_mutex of a given table.
+@param[in]	table	the autoinc_mutex belongs to this table
+@return true, if the current thread owns the autoinc_mutex, false otherwise.*/
+inline
+bool
+dict_table_autoinc_own(
+	const dict_table_t*	table)
+{
+	return(mutex_own(table->autoinc_mutex));
+}
+#endif /* UNIV_DEBUG */
+
 #ifndef UNIV_NONINL
 #include "dict0mem.ic"
 #endif