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vdpdevice: fix error handling and threadsafety

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return NULL incase of initalization errors and guard hashtable access with a mutex
This commit is contained in:
Carl-Anton Ingmarsson 2009-08-17 23:39:14 +02:00 committed by Jan Schmidt
parent 6bd853f128
commit a3452808a1
2 changed files with 40 additions and 11 deletions
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49
sys/vdpau/gstvdpdevice.c
View file

@ -41,6 +41,8 @@ gst_vdp_device_init (GstVdpDevice * device)
device->display_name = NULL;
device->display = NULL;
device->device = VDP_INVALID_HANDLE;
device->constructed = FALSE;
}
static void
@ -162,6 +164,7 @@ gst_vdp_device_constructed (GObject * object)
}
}
device->constructed = TRUE;
return;
error:
@ -239,56 +242,80 @@ gst_vdp_device_new (const gchar * display_name)
device = g_object_new (GST_TYPE_VDP_DEVICE, "display", display_name, NULL);
if (!device->constructed) {
g_object_unref (device);
return NULL;
}
return device;
}
typedef struct
{
GHashTable *hash_table;
GMutex *mutex;
} GstVdpDeviceCache;
static void
device_destroyed_cb (gpointer data, GObject * object)
{
GHashTable *devices_hash = data;
GstVdpDeviceCache *device_cache = data;
GHashTableIter iter;
gpointer device;
GST_DEBUG ("Removing object from hash table");
g_hash_table_iter_init (&iter, devices_hash);
g_mutex_lock (device_cache->mutex);
g_hash_table_iter_init (&iter, device_cache->hash_table);
while (g_hash_table_iter_next (&iter, NULL, &device)) {
if (device == object) {
g_hash_table_iter_remove (&iter);
break;
}
}
g_mutex_unlock (device_cache->mutex);
}
GstVdpDevice *
gst_vdp_get_device (const gchar * display_name)
{
static gsize once = 0;
static GHashTable *devices_hash;
static GstVdpDeviceCache device_cache;
GstVdpDevice *device;
if (g_once_init_enter (&once)) {
GST_DEBUG_CATEGORY_INIT (gst_vdp_device_debug, "vdpaudevice",
0, "vdpaudevice");
devices_hash =
device_cache.hash_table =
g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
device_cache.mutex = g_mutex_new ();
g_once_init_leave (&once, 1);
}
g_mutex_lock (device_cache.mutex);
if (display_name)
device = g_hash_table_lookup (devices_hash, display_name);
device = g_hash_table_lookup (device_cache.hash_table, display_name);
else
device = g_hash_table_lookup (devices_hash, "");
device = g_hash_table_lookup (device_cache.hash_table, "");
if (!device) {
device = gst_vdp_device_new (display_name);
g_object_weak_ref (G_OBJECT (device), device_destroyed_cb, devices_hash);
if (display_name)
g_hash_table_insert (devices_hash, g_strdup (display_name), device);
else
g_hash_table_insert (devices_hash, g_strdup (""), device);
if (device) {
g_object_weak_ref (G_OBJECT (device), device_destroyed_cb, &device_cache);
if (display_name)
g_hash_table_insert (device_cache.hash_table, g_strdup (display_name),
device);
else
g_hash_table_insert (device_cache.hash_table, g_strdup (""), device);
}
} else
g_object_ref (device);
g_mutex_unlock (device_cache.mutex);
return device;
}

2
sys/vdpau/gstvdpdevice.h
View file

@ -48,6 +48,8 @@ struct _GstVdpDevice
{
GObject object;
gboolean constructed;
gchar *display_name;
Display *display;
VdpDevice device;