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/*
* 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;
}
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