diff options
Diffstat (limited to 'src/DatabaseLock.hxx')
-rw-r--r-- | src/DatabaseLock.hxx | 97 |
1 files changed, 0 insertions, 97 deletions
diff --git a/src/DatabaseLock.hxx b/src/DatabaseLock.hxx deleted file mode 100644 index 1bd5cbe61..000000000 --- a/src/DatabaseLock.hxx +++ /dev/null @@ -1,97 +0,0 @@ -/* - * Copyright (C) 2003-2013 The Music Player Daemon Project - * http://www.musicpd.org - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - */ - -/** \file - * - * Support for locking data structures from the database, for safe - * multi-threading. - */ - -#ifndef MPD_DB_LOCK_HXX -#define MPD_DB_LOCK_HXX - -#include "check.h" -#include "thread/Mutex.hxx" -#include "Compiler.h" - -#include <assert.h> - -extern Mutex db_mutex; - -#ifndef NDEBUG - -#include "thread/Id.hxx" - -extern ThreadId db_mutex_holder; - -/** - * Does the current thread hold the database lock? - */ -gcc_pure -static inline bool -holding_db_lock(void) -{ - return db_mutex_holder.IsInside(); -} - -#endif - -/** - * Obtain the global database lock. This is needed before - * dereferencing a #song or #directory. It is not recursive. - */ -static inline void -db_lock(void) -{ - assert(!holding_db_lock()); - - db_mutex.lock(); - - assert(db_mutex_holder.IsNull()); -#ifndef NDEBUG - db_mutex_holder = ThreadId::GetCurrent(); -#endif -} - -/** - * Release the global database lock. - */ -static inline void -db_unlock(void) -{ - assert(holding_db_lock()); -#ifndef NDEBUG - db_mutex_holder = ThreadId::Null(); -#endif - - db_mutex.unlock(); -} - -class ScopeDatabaseLock { -public: - ScopeDatabaseLock() { - db_lock(); - } - - ~ScopeDatabaseLock() { - db_unlock(); - } -}; - -#endif |