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interactive/threads: Clean up

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Add some comments explaining why we use idle handlers to update the UI,
and update to the newest API in GLib master.
This commit is contained in:
Emmanuele Bassi 2011-10-13 10:38:36 +01:00
parent e389240b23
commit c58baf42ca
1 changed files with 32 additions and 12 deletions
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44
tests/interactive/test-threads.c
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@ -5,6 +5,7 @@
#undef CLUTTER_DISABLE_DEPRECATED
#include <clutter/clutter.h>
/* our thread-specific data */
typedef struct
{
ClutterActor *stage;
@ -12,8 +13,6 @@ typedef struct
ClutterActor *progress;
ClutterTimeline *timeline;
volatile gboolean cancelled;
} TestThreadData;
static TestThreadData *
@ -57,7 +56,22 @@ test_thread_done_idle (gpointer user_data)
return FALSE;
}
static GPrivate test_thread_data = G_PRIVATE_INIT (test_thread_data_free);
static void
test_thread_data_done (gpointer _data)
{
TestThreadData *data = _data;
/* since the TestThreadData structure references Clutter data structures
* we need to free it from within the same thread that called clutter_main()
* which means using an idle handler in the main loop.
*
* clutter_threads_add_idle() is guaranteed to run the callback passed to
* to it under the Big Clutter Lock.
*/
clutter_threads_add_idle (test_thread_done_idle, data);
}
static GPrivate test_thread_data = G_PRIVATE_INIT (test_thread_data_done);
typedef struct
{
@ -73,7 +87,6 @@ update_label_idle (gpointer data)
gchar *text;
text = g_strdup_printf ("Count to %d", update->count);
clutter_text_set_text (CLUTTER_TEXT (update->thread_data->label), text);
clutter_actor_set_width (update->thread_data->label, -1);
@ -99,8 +112,6 @@ do_something_very_slow (void)
gint i;
data = g_private_get (&test_thread_data);
if (data->cancelled)
return;
for (i = 0; i < 100; i++)
{
@ -108,13 +119,18 @@ do_something_very_slow (void)
msecs = 1 + (int) (100.0 * rand () / ((RAND_MAX + 1.0) / 3));
/* sleep for a while */
/* sleep for a while, to emulate some work being done */
g_usleep (msecs * 1000);
if ((i % 10) == 0)
{
TestUpdate *update;
/* update the UI from within the main loop, making sure that the
* Big Clutter Lock is held; only one thread at a time can call
* Clutter API, and it's better to do this from the same thread
* that called clutter_init()/clutter_main().
*/
update = g_new (TestUpdate, 1);
update->count = i;
update->thread_data = data;
@ -133,12 +149,9 @@ test_thread_func (gpointer user_data)
g_private_set (&test_thread_data, data);
/* this function will block */
do_something_very_slow ();
clutter_threads_add_idle_full (G_PRIORITY_DEFAULT + 30,
test_thread_done_idle,
data, NULL);
return NULL;
}
@ -167,7 +180,8 @@ on_key_press_event (ClutterStage *stage,
data->progress = g_object_ref (progress_rect);
data->timeline = g_object_ref (timeline);
g_thread_new ("counter", test_thread_func, data, FALSE, NULL);
/* start the thread that updates the counter and the progress bar */
g_thread_new ("counter", test_thread_func, data);
return TRUE;
@ -261,3 +275,9 @@ test_threads_main (int argc, char *argv[])
return EXIT_SUCCESS;
}
const char *
test_threads_describe (void)
{
return "Multi-threading programming with Clutter";
}