srv0start.h, srv0start.c, ha_innodb.cc:

  Add check that sizeof(trx_t) is the same in ha_inndob.cc and InnoDB compilation modules

innobase/include/srv0start.h

@@ -79,6 +79,8 @@ innobase_shutdown_for_mysql(void);
 /*=============================*/
 				/* out: DB_SUCCESS or error code */
 
+extern  ulint   srv_sizeof_trx_t_in_ha_innodb_cc;
+
 extern	ibool	srv_startup_is_before_trx_rollback_phase;
 extern	ibool	srv_is_being_shut_down;
 

innobase/srv/srv0start.c

@@ -56,6 +56,8 @@ Created 2/16/1996 Heikki Tuuri
 #include "srv0start.h"
 #include "que0que.h"
 
+ulint           srv_sizeof_trx_t_in_ha_innodb_cc;
+
 ibool           srv_startup_is_before_trx_rollback_phase = FALSE;
 ibool           srv_is_being_started = FALSE;
 ibool           srv_was_started      = FALSE;
@@ -960,6 +962,15 @@ innobase_start_or_create_for_mysql(void)
 "InnoDB: !!!!!!!!!!!!!! UNIV_MEM_DEBUG switched on !!!!!!!!!!!!!!!\n"); 
 #endif
 
+        if (srv_sizeof_trx_t_in_ha_innodb_cc != (ulint)sizeof(trx_t)) {
+	        fprintf(stderr,
+  "InnoDB: Error: trx_t size is %lu in ha_innodb.cc but %lu in srv0start.c\n"
+  "InnoDB: Check that pthread_mutex_t is defined in the same way in these\n"
+  "InnoDB: compilation modules. Cannot continue.\n",
+		  srv_sizeof_trx_t_in_ha_innodb_cc, (ulint)sizeof(trx_t));
+		return(DB_ERROR);
+	}
+
 	log_do_write = TRUE;
 /*	yydebug = TRUE; */
 

sql/ha_innodb.cc

@@ -747,6 +747,14 @@ innobase_init(void)
 				default_charset_info->sort_order, 256);
 	}
 
+	/* Since we in this module access directly the fields of a trx
+        struct, and due to different headers and flags it might happen that
+	mutex_t has a different size in this module and in InnoDB
+	modules, we check at run time that the size is the same in
+	these compilation modules. */
+
+	srv_sizeof_trx_t_in_ha_innodb_cc = sizeof(trx_t);
+
 	err = innobase_start_or_create_for_mysql();
 
 	if (err != DB_SUCCESS) {