db/DatabasePlugin: pass EventThread's EventLoop to create()

src/Main.cxx

@@ -193,7 +193,9 @@ static bool
 glue_db_init_and_load(void)
 {
 	instance->database =
-		CreateConfiguredDatabase(instance->event_loop, *instance);
+		CreateConfiguredDatabase(instance->event_loop,
+					 instance->io_thread.GetEventLoop(),
+					 *instance);
 	if (instance->database == nullptr)
 		return true;
 

src/db/Configured.cxx

@@ -28,7 +28,7 @@
 #include "util/RuntimeError.hxx"
 
 Database *
-CreateConfiguredDatabase(EventLoop &main_event_loop,
+CreateConfiguredDatabase(EventLoop &main_event_loop, EventLoop &io_event_loop,
 			 DatabaseListener &listener)
 {
 	const auto *param = config_get_block(ConfigBlockOption::DATABASE);
@@ -39,12 +39,12 @@ CreateConfiguredDatabase(EventLoop &main_event_loop,
 					 param->line, path->line);
 
 	if (param != nullptr)
-		return DatabaseGlobalInit(main_event_loop,
+		return DatabaseGlobalInit(main_event_loop, io_event_loop,
 					  listener, *param);
 	else if (path != nullptr) {
 		ConfigBlock block(path->line);
 		block.AddBlockParam("path", path->value.c_str(), path->line);
-		return DatabaseGlobalInit(main_event_loop,
+		return DatabaseGlobalInit(main_event_loop, io_event_loop,
 					  listener, block);
 	} else {
 		/* if there is no override, use the cache directory */
@@ -61,7 +61,7 @@ CreateConfiguredDatabase(EventLoop &main_event_loop,
 
 		ConfigBlock block;
 		block.AddBlockParam("path", db_file_utf8.c_str(), -1);
-		return DatabaseGlobalInit(main_event_loop,
+		return DatabaseGlobalInit(main_event_loop, io_event_loop,
 					  listener, block);
 	}
 }

src/db/Configured.hxx

@@ -34,7 +34,7 @@ class Database;
  * Throws #std::runtime_error on error.
  */
 Database *
-CreateConfiguredDatabase(EventLoop &main_event_loop,
+CreateConfiguredDatabase(EventLoop &main_event_loop, EventLoop &io_event_loop,
 			 DatabaseListener &listener);
 
 #endif

src/db/DatabaseGlue.cxx

@@ -27,6 +27,7 @@
 
 Database *
 DatabaseGlobalInit(EventLoop &main_event_loop,
+		   EventLoop &io_event_loop,
 		   DatabaseListener &listener,
 		   const ConfigBlock &block)
 {
@@ -39,7 +40,8 @@ DatabaseGlobalInit(EventLoop &main_event_loop,
 					 plugin_name);
 
 	try {
-		return plugin->create(main_event_loop, listener, block);
+		return plugin->create(main_event_loop, io_event_loop,
+				      listener, block);
 	} catch (...) {
 		std::throw_with_nested(FormatRuntimeError("Failed to initialize database plugin '%s'",
 							  plugin_name));

src/db/DatabaseGlue.hxx

@@ -36,6 +36,7 @@ class Database;
  */
 Database *
 DatabaseGlobalInit(EventLoop &main_event_loop,
+		   EventLoop &io_event_loop,
 		   DatabaseListener &listener,
 		   const ConfigBlock &block);
 

src/db/DatabasePlugin.hxx

@@ -49,8 +49,11 @@ struct DatabasePlugin {
 	 *
 	 * @param main_event_loop the #EventLoop running in the same
 	 * thread which invokes #Database methods
+	 * @param io_event_loop the #EventLoop running on the
+	 * #EventThread, i.e. the one used for background I/O
 	 */
 	Database *(*create)(EventLoop &main_event_loop,
+			    EventLoop &io_event_loop,
 			    DatabaseListener &listener,
 			    const ConfigBlock &block);
 

src/db/plugins/ProxyDatabasePlugin.cxx

@@ -107,7 +107,9 @@ public:
 	ProxyDatabase(EventLoop &_loop, DatabaseListener &_listener,
 		      const ConfigBlock &block);
 
-	static Database *Create(EventLoop &loop, DatabaseListener &listener,
+	static Database *Create(EventLoop &main_event_loop,
+				EventLoop &io_event_loop,
+				DatabaseListener &listener,
 				const ConfigBlock &block);
 
 	void Open() override;
@@ -345,7 +347,8 @@ ProxyDatabase::ProxyDatabase(EventLoop &_loop, DatabaseListener &_listener,
 }
 
 Database *
-ProxyDatabase::Create(EventLoop &loop, DatabaseListener &listener,
+ProxyDatabase::Create(EventLoop &loop, EventLoop &,
+		      DatabaseListener &listener,
 		      const ConfigBlock &block)
 {
 	return new ProxyDatabase(loop, listener, block);

src/db/plugins/simple/SimpleDatabasePlugin.cxx

@@ -83,7 +83,7 @@ inline SimpleDatabase::SimpleDatabase(AllocatedPath &&_path,
 }
 
 Database *
-SimpleDatabase::Create(gcc_unused EventLoop &loop,
+SimpleDatabase::Create(EventLoop &, EventLoop &,
 		       gcc_unused DatabaseListener &listener,
 		       const ConfigBlock &block)
 {

src/db/plugins/simple/SimpleDatabasePlugin.hxx

@@ -72,7 +72,9 @@ class SimpleDatabase : public Database {
 	SimpleDatabase(AllocatedPath &&_path, bool _compress);
 
 public:
-	static Database *Create(EventLoop &loop, DatabaseListener &listener,
+	static Database *Create(EventLoop &main_event_loop,
+				EventLoop &io_event_loop,
+				DatabaseListener &listener,
 				const ConfigBlock &block);
 
 	gcc_pure

src/db/plugins/upnp/UpnpDatabasePlugin.cxx

@@ -75,7 +75,9 @@ class UpnpDatabase : public Database {
 public:
 	UpnpDatabase():Database(upnp_db_plugin) {}
 
-	static Database *Create(EventLoop &loop, DatabaseListener &listener,
+	static Database *Create(EventLoop &main_event_loop,
+				EventLoop &io_event_loop,
+				DatabaseListener &listener,
 				const ConfigBlock &block);
 
 	void Open() override;
@@ -138,7 +140,7 @@ private:
 };
 
 Database *
-UpnpDatabase::Create(gcc_unused EventLoop &loop,
+UpnpDatabase::Create(EventLoop &, EventLoop &,
 		     gcc_unused DatabaseListener &listener,
 		     const ConfigBlock &)
 {

test/DumpDatabase.cxx

@@ -138,6 +138,7 @@ try {
 		block.AddBlockParam("path", path->value.c_str(), path->line);
 
 	Database *db = plugin->create(init.GetEventLoop(),
+				      init.GetEventLoop(),
 				      database_listener, block);
 
 	AtScopeExit(db) { delete db; };