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texture: Simplify asynchronous loading code

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The asynchronous loading code could do with some modernization.

First of all, we should drop the internal GMutex held when manipulating
the boolean flags: it's far too expensive for its role, and modern GLib
provides us with bitlocks that are quite a lot faster.

Then we should consolidate most of the implementation into something
smaller and more manageable.
This commit is contained in:
Emmanuele Bassi 2011-09-27 16:06:43 +01:00
parent 11c585c420
commit 56c7d9b0b3
1 changed files with 114 additions and 154 deletions
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268
clutter/clutter-texture.c
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@ -99,36 +99,37 @@ struct _ClutterTexturePrivate
guint seen_create_pick_material_warning : 1;
};
#define ASYNC_STATE_LOCKED 1
#define ASYNC_STATE_CANCELLED 2
#define ASYNC_STATE_QUEUED 3
struct _ClutterTextureAsyncData
{
/* Mutex used to synchronize setting the abort flag */
GMutex *mutex;
/* If set to true, the loaded data will be discarded */
gboolean abort;
/* The texture for which the data is being loaded */
ClutterTexture *texture;
/* Source ID of the idle handler for loading. If this is zero then
the data is being loaded in a thread from the thread pool. Once
the thread is finished it will be converted to idle load handler
and load_idle will be nonzero. If load_idle is nonzero, and
upload_queued is FALSE then the rest of the load can safely be
aborted by just removing the source, otherwise the abort flag
needs to be set and the data should be disowned */
guint load_idle;
gchar *load_filename;
CoglHandle load_bitmap;
/* Set when the texture is queued for GPU upload, used to determine
* what to do with the texture data when load_idle is zero.
*/
gboolean upload_queued;
guint load_idle;
gchar *load_filename;
CoglHandle load_bitmap;
GError *load_error;
GError *load_error;
gint state;
};
static inline void
clutter_texture_async_data_lock (ClutterTextureAsyncData *data)
{
g_bit_lock (&data->state, 0);
}
static inline void
clutter_texture_async_data_unlock (ClutterTextureAsyncData *data)
{
g_bit_unlock (&data->state, 0);
}
enum
{
PROP_0,
@ -711,19 +712,14 @@ clutter_texture_async_data_free (ClutterTextureAsyncData *data)
once it is known that the load thread has completed or from the
load thread/upload function itself if the abort flag is true (in
which case the main thread has disowned the data) */
g_free (data->load_filename);
if (data->load_filename)
g_free (data->load_filename);
if (data->load_bitmap)
if (data->load_bitmap != NULL)
cogl_handle_unref (data->load_bitmap);
if (data->load_error)
if (data->load_error != NULL)
g_error_free (data->load_error);
if (data->mutex)
g_mutex_free (data->mutex);
g_slice_free (ClutterTextureAsyncData, data);
}
@ -739,40 +735,30 @@ clutter_texture_async_load_cancel (ClutterTexture *texture)
{
ClutterTexturePrivate *priv = texture->priv;
if (priv->async_data)
if (priv->async_data != NULL)
{
GMutex *mutex = priv->async_data->mutex;
ClutterTextureAsyncData *async_data = priv->async_data;
/* The mutex will only be NULL if the no thread was used for
this load, in which case there's no need for any
synchronization */
if (mutex)
g_mutex_lock (mutex);
priv->async_data = NULL;
/* If there is no thread behind this load then we can just abort
the idle handler and destroy the load data immediately */
if (priv->async_data->load_idle)
if (async_data->load_idle != 0)
{
g_source_remove (priv->async_data->load_idle);
priv->async_data->load_idle = 0;
g_source_remove (async_data->load_idle);
async_data->load_idle = 0;
if (mutex)
g_mutex_unlock (mutex);
clutter_texture_async_data_free (priv->async_data);
clutter_texture_async_data_free (async_data);
}
else
{
/* Otherwise we need to tell the thread to abort and disown
the data, if the data has been loaded and decoded the data
is now waiting for a master clock iteration to be repainted */
priv->async_data->abort = TRUE;
clutter_texture_async_data_lock (async_data);
if (mutex)
g_mutex_unlock (mutex);
CLUTTER_NOTE (TEXTURE, "[async] cancelling operation for '%s'",
async_data->load_filename);
async_data->state |= ASYNC_STATE_CANCELLED;
clutter_texture_async_data_unlock (async_data);
}
priv->async_data = NULL;
}
}
@ -1736,8 +1722,8 @@ clutter_texture_async_load_complete (ClutterTexture *self,
const GError *error)
{
ClutterTexturePrivate *priv = self->priv;
CoglHandle handle;
CoglTextureFlags flags = COGL_TEXTURE_NONE;
CoglHandle handle;
priv->async_data = NULL;
@ -1766,30 +1752,6 @@ clutter_texture_async_load_complete (ClutterTexture *self,
clutter_actor_queue_relayout (CLUTTER_ACTOR (self));
}
static gboolean
clutter_texture_thread_idle_func (gpointer user_data)
{
ClutterTextureAsyncData *data = user_data;
/* Grab the mutex so we can be sure the thread has unlocked it
before we destroy it */
g_mutex_lock (data->mutex);
if (data->abort)
{
g_mutex_unlock (data->mutex);
clutter_texture_async_data_free (data);
return FALSE;
}
g_mutex_unlock (data->mutex);
clutter_texture_async_load_complete (data->texture, data->load_bitmap,
data->load_error);
clutter_texture_async_data_free (data);
return FALSE;
}
static gboolean
texture_repaint_upload_func (gpointer user_data)
{
@ -1797,7 +1759,7 @@ texture_repaint_upload_func (gpointer user_data)
g_mutex_lock (&upload_list_mutex);
if (upload_list)
if (upload_list != NULL)
{
start_time = clutter_get_timestamp ();
@ -1806,16 +1768,32 @@ texture_repaint_upload_func (gpointer user_data)
*/
do
{
ClutterTextureAsyncData *data = upload_list->data;
ClutterTextureAsyncData *async_data = upload_list->data;
clutter_texture_thread_idle_func (data);
clutter_texture_async_data_lock (async_data);
upload_list = g_list_remove (upload_list, data);
if (async_data->state & ASYNC_STATE_QUEUED)
{
CLUTTER_NOTE (TEXTURE, "[async] operation complete for '%s'",
async_data->load_filename);
clutter_texture_async_load_complete (async_data->texture,
async_data->load_bitmap,
async_data->load_error);
}
else
CLUTTER_NOTE (TEXTURE, "[async] operation cancelled for '%s'",
async_data->load_filename);
clutter_texture_async_data_unlock (async_data);
upload_list = g_list_remove (upload_list, async_data);
clutter_texture_async_data_free (async_data);
}
while (upload_list && clutter_get_timestamp () < start_time + 5 * 1000);
}
if (upload_list)
if (upload_list != NULL)
{
ClutterMasterClock *master_clock;
@ -1829,47 +1807,23 @@ texture_repaint_upload_func (gpointer user_data)
}
static void
clutter_texture_thread_func (gpointer user_data, gpointer pool_data)
clutter_texture_thread_load (gpointer user_data,
gpointer pool_data)
{
ClutterTextureAsyncData *data = user_data;
gboolean should_abort;
ClutterTextureAsyncData *async_data = user_data;
ClutterMasterClock *master_clock = _clutter_master_clock_get_default ();
/* Make sure we haven't been told to abort before the thread had a
chance to run */
g_mutex_lock (data->mutex);
should_abort = data->abort;
g_mutex_unlock (data->mutex);
clutter_texture_async_data_lock (async_data);
if (should_abort)
if (~async_data->state & ASYNC_STATE_CANCELLED)
{
/* If we've been told to abort then main thread has disowned the
async data and we need to free it */
clutter_texture_async_data_free (data);
return;
}
CLUTTER_NOTE (TEXTURE, "[async] loading bitmap from file '%s'",
async_data->load_filename);
data->load_bitmap = cogl_bitmap_new_from_file (data->load_filename,
&data->load_error);
async_data->load_bitmap =
cogl_bitmap_new_from_file (async_data->load_filename,
&async_data->load_error);
/* Check again if we've been told to abort */
g_mutex_lock (data->mutex);
if (data->abort)
{
g_mutex_unlock (data->mutex);
clutter_texture_async_data_free (data);
}
else
{
ClutterMasterClock *master_clock = _clutter_master_clock_get_default ();
/* Make sure we give the image to GL in the main thread, where we
* hold the main Clutter lock. Once load_idle is non-NULL then the
* main thread is guaranteed not to set the abort flag. It can't
* set it while we're holding the mutex so we can safely start the
* idle handler now without the possibility of calling the
* callback after it is aborted */
g_mutex_lock (&upload_list_mutex);
if (repaint_upload_func == 0)
@ -1879,33 +1833,40 @@ clutter_texture_thread_func (gpointer user_data, gpointer pool_data)
NULL, NULL);
}
upload_list = g_list_append (upload_list, data);
data->upload_queued = TRUE;
upload_list = g_list_append (upload_list, async_data);
async_data->state |= ASYNC_STATE_QUEUED;
CLUTTER_NOTE (TEXTURE, "[async] operation queued");
g_mutex_unlock (&upload_list_mutex);
g_mutex_unlock (data->mutex);
_clutter_master_clock_ensure_next_iteration (master_clock);
}
else
{
clutter_texture_async_data_unlock (async_data);
clutter_texture_async_data_free (async_data);
return;
}
clutter_texture_async_data_unlock (async_data);
_clutter_master_clock_ensure_next_iteration (master_clock);
}
static gboolean
clutter_texture_idle_func (gpointer user_data)
clutter_texture_idle_load (gpointer data)
{
ClutterTextureAsyncData *data = user_data;
GError *internal_error = NULL;
ClutterTextureAsyncData *async_data = data;
data->load_bitmap = cogl_bitmap_new_from_file (data->load_filename,
&internal_error);
async_data->load_bitmap =
cogl_bitmap_new_from_file (async_data->load_filename,
&async_data->load_error);
clutter_texture_async_load_complete (data->texture, data->load_bitmap,
internal_error);
clutter_texture_async_load_complete (async_data->texture,
async_data->load_bitmap,
async_data->load_error);
if (internal_error)
g_error_free (internal_error);
clutter_texture_async_data_free (data);
clutter_texture_async_data_free (async_data);
return FALSE;
}
@ -1956,9 +1917,7 @@ clutter_texture_async_load (ClutterTexture *self,
height = 0;
}
else
{
res = cogl_bitmap_get_size_from_file (filename, &width, &height);
}
res = cogl_bitmap_get_size_from_file (filename, &width, &height);
if (!res)
{
@ -1975,35 +1934,34 @@ clutter_texture_async_load (ClutterTexture *self,
clutter_texture_async_load_cancel (self);
data = g_slice_new (ClutterTextureAsyncData);
data = g_slice_new0 (ClutterTextureAsyncData);
data->abort = FALSE;
data->texture = self;
data->load_idle = 0;
data->load_filename = g_strdup (filename);
data->load_bitmap = NULL;
data->load_error = NULL;
priv->async_data = data;
if (g_thread_supported ())
{
data->mutex = g_mutex_new ();
if (async_thread_pool == NULL)
/* This apparently can't fail if exclusive == FALSE */
async_thread_pool
= g_thread_pool_new (clutter_texture_thread_func,
NULL, 1, FALSE, NULL);
if (G_UNLIKELY (async_thread_pool == NULL))
{
/* This apparently can't fail if exclusive == FALSE */
async_thread_pool =
g_thread_pool_new (clutter_texture_thread_load, NULL,
1,
FALSE,
NULL);
}
g_thread_pool_push (async_thread_pool, data, NULL);
}
else
{
data->mutex = NULL;
data->load_idle
= clutter_threads_add_idle (clutter_texture_idle_func, data);
data->load_idle =
clutter_threads_add_idle_full (G_PRIORITY_DEFAULT_IDLE,
clutter_texture_idle_load,
data,
NULL);
}
return TRUE;
@ -2921,6 +2879,8 @@ clutter_texture_set_load_async (ClutterTexture *texture,
priv = texture->priv;
load_async = !!load_async;
if (priv->load_async_set != load_async)
{
priv->load_data_async = load_async;