1 files changed, 95 insertions, 0 deletions
diff --git a/src/libaudcore/cue-cache.cc b/src/libaudcore/cue-cache.cc
new file mode 100644
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--- /dev/null
+++ b/src/libaudcore/cue-cache.cc
@@ -0,0 +1,95 @@
+/*
+ * cue-cache.cc
+ * Copyright 2016 John Lindgren
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions, and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions, and the following disclaimer in the documentation
+ *    provided with the distribution.
+ *
+ * This software is provided "as is" and without any warranty, express or
+ * implied. In no event shall the authors be liable for any damages arising from
+ * the use of this software.
+ */
+
+#include "cue-cache.h"
+#include "multihash.h"
+#include "playlist-internal.h"
+
+#include <pthread.h>
+
+enum NodeState {NotLoaded, Loading, Loaded};
+
+struct CueCacheNode {
+    Index<PlaylistAddItem> items;
+    NodeState state = NotLoaded;
+    int refcount = 0;
+};
+
+static SimpleHash<String, CueCacheNode> cache;
+static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
+
+CueCacheRef::CueCacheRef (const char * filename) :
+    m_filename (filename)
+{
+    pthread_mutex_lock (& mutex);
+
+    m_node = cache.lookup (m_filename);
+    if (! m_node)
+        m_node = cache.add (m_filename, CueCacheNode ());
+
+    m_node->refcount ++;
+
+    pthread_mutex_unlock (& mutex);
+}
+
+CueCacheRef::~CueCacheRef ()
+{
+    pthread_mutex_lock (& mutex);
+
+    m_node->refcount --;
+    if (! m_node->refcount)
+        cache.remove (m_filename);
+
+    pthread_mutex_unlock (& mutex);
+}
+
+const Index<PlaylistAddItem> & CueCacheRef::load ()
+{
+    String title; // not used
+    pthread_mutex_lock (& mutex);
+
+    switch (m_node->state)
+    {
+    case NotLoaded:
+        // load the cuesheet in this thread
+        m_node->state = Loading;
+        pthread_mutex_unlock (& mutex);
+        playlist_load (m_filename, title, m_node->items);
+        pthread_mutex_lock (& mutex);
+
+        m_node->state = Loaded;
+        pthread_cond_broadcast (& cond);
+        break;
+
+    case Loading:
+        // wait for cuesheet to load in another thread
+        while (m_node->state != Loaded)
+            pthread_cond_wait (& cond, & mutex);
+
+        break;
+
+    case Loaded:
+        // cuesheet already loaded
+        break;
+    }
+
+    pthread_mutex_unlock (& mutex);
+    return m_node->items;
+}