Safely reopen gravity database

src/database/gravity-db.c

@@ -54,6 +54,14 @@ void gravityDB_forked(void)
 	gravityDB_open();
 }
 
+void gravityDB_reopen(void)
+{
+	lock_shm();
+	gravityDB_close();
+	gravityDB_open();
+	unlock_shm();
+}
+
 // Open gravity database
 bool gravityDB_open(void)
 {

src/database/gravity-db.h

@@ -19,6 +19,7 @@
 enum gravity_tables { GRAVITY_TABLE, EXACT_BLACKLIST_TABLE, EXACT_WHITELIST_TABLE, REGEX_BLACKLIST_TABLE, REGEX_WHITELIST_TABLE, UNKNOWN_TABLE } __attribute__ ((packed));
 
 void gravityDB_forked(void);
+void gravityDB_reopen(void);
 bool gravityDB_open(void);
 bool gravityDB_prepare_client_statements(const int clientID, clientsData* client);
 void gravityDB_close(void);

src/datastructure.c

@@ -378,8 +378,7 @@ void FTL_reload_all_domainlists(void)
 	flush_message_table();
 
 	// (Re-)open gravity database connection
-	gravityDB_close();
-	gravityDB_open();
+	gravityDB_reopen();
 
 	// Reset number of blocked domains
 	counters->gravity = gravityDB_count(GRAVITY_TABLE);