Many files:

Modifications for query cache + trxs, fix of q.c.+ foreign keys
os0file.c:
  Use unbuffered i/o in Windows

innobase/dict/dict0mem.c

@@ -74,6 +74,8 @@ dict_mem_table_create(
 
 	table->auto_inc_lock = mem_heap_alloc(heap, lock_get_size());
 
+	table->query_cache_inv_trx_id = ut_dulint_zero;
+
 	UT_LIST_INIT(table->locks);
 	UT_LIST_INIT(table->foreign_list);
 	UT_LIST_INIT(table->referenced_list);

innobase/lock/lock0lock.c

@@ -14,6 +14,8 @@ Created 5/7/1996 Heikki Tuuri
 
 #include "usr0sess.h"
 #include "trx0purge.h"
+#include "dict0mem.h"
+#include "trx0sys.h"
 
 /* Restricts the length of search we will do in the waits-for
 graph of transactions */
@@ -3416,8 +3418,9 @@ lock_release_off_kernel(
 /*====================*/
 	trx_t*	trx)	/* in: transaction */
 {
-	ulint	count;
+	dict_table_t*	table;
-	lock_t*	lock;
+	ulint		count;
+	lock_t*		lock;
 
 	ut_ad(mutex_own(&kernel_mutex));
 
@@ -3435,6 +3438,19 @@ lock_release_off_kernel(
 		} else {
 			ut_ad(lock_get_type(lock) == LOCK_TABLE);
 
+			if (lock_get_mode(lock) != LOCK_IS
+			    && (trx->insert_undo || trx->update_undo)) {
+
+				/* The trx may have modified the table.
+				We block the use of the MySQL query cache
+				for all currently active transactions. */
+
+				table = lock->un_member.tab_lock.table;
+			
+				table->query_cache_inv_trx_id =
+							trx_sys->max_trx_id;
+			}
+
 			lock_table_dequeue(lock);
 		}
 

innobase/os/os0file.c

@@ -669,13 +669,14 @@ os_file_get_size(
 		return(FALSE);
 	}
 	
-#if SIZEOF_OFF_T > 4
+	if (sizeof(off_t) > 4) {
-	*size = (ulint)(offs & 0xFFFFFFFF);
+	        *size = (ulint)(offs & 0xFFFFFFFF);
-	*size_high = (ulint)(offs >> 32);
+		*size_high = (ulint)(offs >> 32);
-#else
+	} else {
-	*size = (ulint) offs;
+		*size = (ulint) offs;
-	*size_high = 0;
+		*size_high = 0;
-#endif	
+	}
+	
 	return(TRUE);	
 #endif
 }
@@ -838,16 +839,18 @@ os_file_pread(
         /* If off_t is > 4 bytes in size, then we assume we can pass a
 	64-bit address */
 
-#if SIZEOF_OFF_T > 4
+        if (sizeof(off_t) > 4) {
-	offs = (off_t)offset + (((off_t)offset_high) << 32);
+	        offs = (off_t)offset + (((off_t)offset_high) << 32);
-#else
+        				
-	offs = (off_t)offset;
+        } else {
+        	offs = (off_t)offset;
 
-	if (offset_high > 0) {
+        	if (offset_high > 0) {
-	  fprintf(stderr,
+        		fprintf(stderr,
-		  "InnoDB: Error: file read at offset > 4 GB\n");
+			"InnoDB: Error: file read at offset > 4 GB\n");
+		}
         }
-#endif
+
 	os_n_file_reads++;
 
 #ifdef HAVE_PREAD

innobase/row/row0ins.c

@@ -32,6 +32,23 @@ Created 4/20/1996 Heikki Tuuri
 #define	ROW_INS_PREV	1
 #define	ROW_INS_NEXT	2
 
+
+/*********************************************************************
+This prototype is copied from /mysql/sql/ha_innodb.cc.
+Invalidates the MySQL query cache for the table.
+NOTE that the exact prototype of this function has to be in
+/innobase/row/row0ins.c! */
+
+void
+innobase_invalidate_query_cache(
+/*============================*/
+	trx_t*	trx,		/* in: transaction which modifies the table */
+	char*	full_name,	/* in: concatenation of database name, null
+				char '\0', table name; NOTE that in
+				Windows this is always in LOWER CASE! */
+	ulint	full_name_len);	/* in: full name length */
+
+
 /*************************************************************************
 Creates an insert node struct. */
 
@@ -386,10 +403,30 @@ row_ins_foreign_delete_or_set_null(
 	upd_t*		update;
 	ulint		err;
 	ulint		i;
+	char*		ptr;
+	char		table_name_buf[1000];
 	char		err_buf[1000];
 	
 	ut_a(thr && foreign && pcur && mtr);
 
+	/* Since we are going to delete or update a row, we have to invalidate
+	the MySQL query cache for table */
+
+	ut_a(ut_strlen(table->name) < 998);
+	
+	ut_memcpy(table_name_buf, table->name, ut_strlen(table->name) + 1);
+
+	ptr = table_name_buf;
+
+	while (*ptr != '/') {
+		ptr++;
+	}
+
+	*ptr = '\0';
+	
+	/* We call a function in ha_innodb.cc */
+	innobase_invalidate_query_cache(thr_get_trx(thr), table_name_buf,
+						ut_strlen(table->name));
 	node = thr->run_node;
 
 	ut_a(que_node_get_type(node) == QUE_NODE_UPDATE);

innobase/row/row0mysql.c

@@ -1186,12 +1186,7 @@ row_create_table_for_mysql(
 	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
 	ut_ad(mutex_own(&(dict_sys->mutex)));
 	
-	/* We allow a create table also if innodb_force_recovery is used. This
+	if (srv_created_new_raw || srv_force_recovery) {
-        enables the user to stop a runaway rollback or a crash caused by
-	a temporary table #sql... He can use the trick explained in the
-	manual to rename the temporary table to rsql..., and then drop it. */
-
-	if (srv_created_new_raw) {
 		fprintf(stderr,
 		"InnoDB: A new raw disk partition was initialized or\n"
 		"InnoDB: innodb_force_recovery is on: we do not allow\n"
@@ -1712,13 +1707,7 @@ row_drop_table_for_mysql(
 	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
 	ut_a(name != NULL);
 
-	/* Note that we allow dropping of a table even if innodb_force_recovery
+	if (srv_created_new_raw || srv_force_recovery) {
-        is used. If a rollback or purge would crash because of a corrupt
-        table, the user can try dropping it to avoid the crash. This is also
-        a nice way to stop a runaway rollback caused by a failing big
-        table import in a single transaction. */
-
-	if (srv_created_new_raw) {
 		fprintf(stderr,
 		"InnoDB: A new raw disk partition was initialized or\n"
 		"InnoDB: innodb_force_recovery is on: we do not allow\n"

innobase/row/row0sel.c

@@ -30,6 +30,7 @@ Created 12/19/1997 Heikki Tuuri
 #include "pars0sym.h"
 #include "pars0pars.h"
 #include "row0mysql.h"
+#include "read0read.h"
 
 /* Maximum number of rows to prefetch; MySQL interface has another parameter */
 #define SEL_MAX_N_PREFETCH	16
@@ -3115,3 +3116,56 @@ normal_return:
 
 	return(ret);
 }
+
+/***********************************************************************
+Checks if MySQL at the moment is allowed for this table to retrieve a
+consistent read result, or store it to the query cache. */
+
+ibool
+row_search_check_if_query_cache_permitted(
+/*======================================*/
+				/* out: TRUE if storing or retrieving from
+				the query cache is permitted */
+	trx_t*	trx,		/* in: transaction object */
+	char*	norm_name)	/* in: concatenation of database name, '/'
+				char, table name */
+{
+	dict_table_t*	table;
+	ibool		ret 	= FALSE;
+
+	table = dict_table_get(norm_name, trx);
+
+	if (table == NULL) {
+
+		return(FALSE);
+	}
+
+	mutex_enter(&kernel_mutex);
+
+	/* Start the transaction if it is not started yet */
+
+	trx_start_if_not_started_low(trx);
+
+	/* If there are locks on the table or some trx has invalidated the
+	cache up to our trx id, then ret = FALSE.
+	We do not check what type locks there are on the table, though only
+	IX type locks actually would require ret = FALSE. */
+
+	if (UT_LIST_GET_LEN(table->locks) == 0
+	    && ut_dulint_cmp(trx->id, table->query_cache_inv_trx_id) >= 0) {
+
+		ret = TRUE;
+		
+		/* Assign a read view for the transaction if it does not yet
+		have one */
+
+		if (!trx->read_view) {
+			trx->read_view = read_view_open_now(trx,
+						trx->read_view_heap);
+		}
+	}
+	
+	mutex_exit(&kernel_mutex);
+
+	return(ret);
+}

innobase/srv/srv0srv.c

@@ -96,7 +96,7 @@ ulint	srv_n_log_files		= ULINT_MAX;
 ulint	srv_log_file_size	= ULINT_MAX;	/* size in database pages */ 
 ibool	srv_log_archive_on	= TRUE;
 ulint	srv_log_buffer_size	= ULINT_MAX;	/* size in database pages */ 
-ulint	srv_flush_log_at_trx_commit = 1;
+ibool	srv_flush_log_at_trx_commit = TRUE;
 
 byte	srv_latin1_ordering[256]	/* The sort order table of the latin1
 					character set. The following table is

sql/ha_innodb.cc

@@ -14,13 +14,12 @@
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
 
-/*
+/* This file defines the InnoDB handler: the interface between MySQL and
-  This file defines the InnoDB handler: the interface between MySQL and InnoDB */
+InnoDB */
 
 /* TODO list for the InnoDB handler:
   - Ask Monty if strings of different languages can exist in the same
     database. Answer: in 4.1 yes.
-
 */
 
 #ifdef __GNUC__
@@ -29,6 +28,8 @@
 
 #include "mysql_priv.h"
 #include "slave.h"
+#include "sql_cache.h"
+
 #ifdef HAVE_INNOBASE_DB
 #include <m_ctype.h>
 #include <assert.h>
@@ -101,18 +102,11 @@ char*	innobase_unix_file_flush_method		= NULL;
 /* Below we have boolean-valued start-up parameters, and their default
 values */
 
+uint	innobase_flush_log_at_trx_commit	= 0;
 my_bool innobase_log_archive			= FALSE;
 my_bool	innobase_use_native_aio			= FALSE;
 my_bool	innobase_fast_shutdown			= TRUE;
 
-/* innodb_flush_log_at_trx_commit can now have 3 values:
-0 : write to the log file once per second and flush it to disk;
-1 : write to the log file at each commit and flush it to disk;
-2 : write to the log file at each commit, but flush to disk only once per
-second */
-
-uint    innobase_flush_log_at_trx_commit	= 0;
-
 /*
   Set default InnoDB data file size to 10 MB and let it be
   auto-extending. Thus users can use InnoDB without having to
@@ -412,6 +406,176 @@ ha_innobase::update_thd(
 	return(0);
 }
 
+
+/*   BACKGROUND INFO: HOW THE MYSQL QUERY CACHE WORKS WITH INNODB
+     ------------------------------------------------------------
+
+1) The use of the query cache for TBL is disabled when there is an
+uncommitted change to TBL.
+
+2) When a change to TBL commits, InnoDB stores the current value of
+its global trx id counter, let us denote it by INV_TRX_ID, to the table object
+in the InnoDB data dictionary, and does only allow such transactions whose
+id >= INV_TRX_ID to use the query cache.
+
+3) When InnoDB does an INSERT/DELETE/UPDATE to a table TBL, or an implicit
+modification because an ON DELETE CASCADE, we invalidate the MySQL query cache
+of TBL immediately.
+
+How this is implemented inside InnoDB:
+
+1) Since every modification always sets an IX type table lock on the InnoDB
+table, it is easy to check if there can be uncommitted modifications for a
+table: just check if there are locks in the lock list of the table.
+
+2) When a transaction inside InnoDB commits, it reads the global trx id
+counter and stores the value INV_TRX_ID to the tables on which it had a lock.
+
+3) If there is an implicit table change from ON DELETE CASCADE or SET NULL,
+InnoDB calls an invalidate method for the MySQL query cache for that table.
+
+How this is implemented inside sql_cache.cc:
+
+1) The query cache for an InnoDB table TBL is invalidated immediately at an
+INSERT/UPDATE/DELETE, just like in the case of MyISAM. No need to delay
+invalidation to the transaction commit.
+
+2) To store or retrieve a value from the query cache of an InnoDB table TBL,
+any query must first ask InnoDB's permission. We must pass the thd as a
+parameter because InnoDB will look at the trx id, if any, associated with
+that thd.
+
+3) Use of the query cache for InnoDB tables is now allowed also when
+AUTOCOMMIT==0 or we are inside BEGIN ... COMMIT. Thus transactions no longer
+put restrictions on the use of the query cache.
+*/
+
+/**********************************************************************
+The MySQL query cache uses this to check from InnoDB if the query cache at
+the moment is allowed to operate on an InnoDB table. The SQL query must
+be a non-locking SELECT.
+
+The query cache is allowed to operate on certain query only if this function
+returns TRUE for all tables in the query.
+
+If thd is not in the autocommit state, this function also starts a new
+transaction for thd if there is no active trx yet, and assigns a consistent
+read view to it if there is no read view yet. */
+
+my_bool
+innobase_query_caching_of_table_permitted(
+/*======================================*/
+				/* out: TRUE if permitted, FALSE if not;
+				note that the value FALSE does not mean
+				we should invalidate the query cache:
+				invalidation is called explicitly */
+	THD*	thd,		/* in: thd of the user who is trying to
+				store a result to the query cache or
+				retrieve it */
+	char*	full_name,	/* in: concatenation of database name,
+				the null character '\0', and the table
+				name */
+	uint	full_name_len)	/* in: length of the full name, i.e.
+				len(dbname) + len(tablename) + 1 */
+{
+	ibool	is_autocommit;
+	trx_t*	trx;
+	char*	ptr;
+	char	norm_name[1000];
+
+	ut_a(full_name_len < 999);
+
+	if (thd->variables.tx_isolation == ISO_SERIALIZABLE) {
+		/* In the SERIALIZABLE mode we add LOCK IN SHARE MODE to every
+		plain SELECT */
+	
+		return((my_bool)FALSE);
+	}
+
+	trx = (trx_t*) thd->transaction.all.innobase_tid;
+
+	if (trx == NULL) {
+		trx = check_trx_exists(thd);
+	}
+
+	innobase_release_stat_resources(trx);
+
+	if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {
+
+		is_autocommit = TRUE;
+	} else {
+		is_autocommit = FALSE;
+
+	}
+
+	if (is_autocommit && trx->conc_state == TRX_NOT_STARTED) {
+		/* We are going to retrieve the query result from the
+		query cache. This cannot be a store operation because then
+		we would have started the trx already.
+
+		We can imagine we instantaneously serialize
+		this consistent read trx to the current trx id counter.
+		If trx2 would have changed the tables of a query
+		result stored in the cache, and trx2 would have already
+		committed, making the result obsolete, then trx2 would have
+		already invalidated the cache. Thus we can trust the result
+		in the cache is ok for this query. */
+
+		return((my_bool)TRUE);
+	}
+	
+	/* Normalize the table name to InnoDB format */
+
+	memcpy(norm_name, full_name, full_name_len);
+
+	norm_name[strlen(norm_name)] = '/'; /* InnoDB uses '/' as the
+					    separator between db and table */
+	norm_name[full_name_len] = '\0';
+#ifdef __WIN__
+	/* Put to lower case */
+
+	ptr = norm_name;
+
+	while (*ptr != '\0') {
+	        *ptr = tolower(*ptr);
+	        ptr++;
+	}
+#endif
+	if (row_search_check_if_query_cache_permitted(trx, norm_name)) {
+
+		printf("Query cache for %s permitted\n", norm_name);
+
+		return((my_bool)TRUE);
+	}
+
+	printf("Query cache for %s NOT permitted\n", norm_name);
+
+	return((my_bool)FALSE);
+}
+
+extern "C" {
+/*********************************************************************
+Invalidates the MySQL query cache for the table.
+NOTE that the exact prototype of this function has to be in
+/innobase/row/row0ins.c! */
+
+void
+innobase_invalidate_query_cache(
+/*============================*/
+	trx_t*	trx,		/* in: transaction which modifies the table */
+	char*	full_name,	/* in: concatenation of database name, null
+				char '\0', table name; NOTE that in
+				Windows this is always in LOWER CASE! */
+	ulint	full_name_len)	/* in: full name length */
+{
+	/* Argument TRUE below means we are using transactions */
+	query_cache.invalidate((THD*)(trx->mysql_thd),
+					(const char*)full_name,
+					(uint32)full_name_len,
+					TRUE);
+}
+}
+
 /*********************************************************************
 Call this when you have opened a new table handle in HANDLER, before you
 call index_read_idx() etc. Actually, we can let the cursor stay open even

sql/ha_innodb.h

@@ -204,3 +204,5 @@ int innobase_close_connection(THD *thd);
 int innobase_drop_database(char *path);
 int innodb_show_status(THD* thd);
 
+my_bool innobase_query_caching_of_table_permitted(THD* thd, char* full_name,
+						uint full_name_len);