From 0240e75426f483ff558422f99e29708e3f31fdb7 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Wed, 5 Sep 2012 20:50:15 +0200
Subject: db_lock: add C++ helper class ScopeDatabaseLock

---
 src/db/SimpleDatabasePlugin.cxx | 17 ++++++-----------
 src/db_lock.h                   | 15 +++++++++++++++
 2 files changed, 21 insertions(+), 11 deletions(-)

(limited to 'src')

diff --git a/src/db/SimpleDatabasePlugin.cxx b/src/db/SimpleDatabasePlugin.cxx
index 54441f4cd..1e5ffe9bb 100644
--- a/src/db/SimpleDatabasePlugin.cxx
+++ b/src/db/SimpleDatabasePlugin.cxx
@@ -250,11 +250,8 @@ SimpleDatabase::LookupDirectory(const char *uri) const
 	assert(root != NULL);
 	assert(uri != NULL);
 
-	db_lock();
-	struct directory *directory =
-		directory_lookup_directory(root, uri);
-	db_unlock();
-	return directory;
+	ScopeDatabaseLock protect;
+	return directory_lookup_directory(root, uri);
 }
 
 bool
@@ -281,12 +278,10 @@ SimpleDatabase::Visit(const DatabaseSelection &selection,
 	    !visit_directory(*directory, error_r))
 		return false;
 
-	db_lock();
-	bool ret = directory->Walk(selection.recursive, selection.filter,
-				   visit_directory, visit_song, visit_playlist,
-				   error_r);
-	db_unlock();
-	return ret;
+	ScopeDatabaseLock protect;
+	return directory->Walk(selection.recursive, selection.filter,
+			       visit_directory, visit_song, visit_playlist,
+			       error_r);
 }
 
 bool
diff --git a/src/db_lock.h b/src/db_lock.h
index 4640502f3..eed71eec0 100644
--- a/src/db_lock.h
+++ b/src/db_lock.h
@@ -81,4 +81,19 @@ db_unlock(void)
 	g_static_mutex_unlock(&db_mutex);
 }
 
+#ifdef __cplusplus
+
+class ScopeDatabaseLock {
+public:
+	ScopeDatabaseLock() {
+		db_lock();
+	}
+
+	~ScopeDatabaseLock() {
+		db_unlock();
+	}
+};
+
+#endif
+
 #endif
-- 
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