core/idle: Add support for running idle tasks in a new thread

Signed-off-by: Anna Schumaker <Anna@OcarinaProject.net>

core/core.c

@@ -6,6 +6,7 @@
 #include <core/collection.h>
 #include <core/filter.h>
 #include <core/history.h>
+#include <core/idle.h>
 #include <core/playlist.h>
 #include <core/tags/tags.h>
 #include <core/tempq.h>
@@ -13,6 +14,7 @@
 
 void core_init(int *argc, char ***argv, struct core_init_data *init)
 {
+	idle_init();
 	filter_init();
 	tags_init();
 	playlist_init(init->playlist_ops);
@@ -31,4 +33,5 @@ void core_deinit()
 	playlist_deinit();
 	tags_deinit();
 	filter_deinit();
+	idle_deinit();
 }

core/idle.c

@@ -8,21 +8,58 @@
 struct idle_task {
 	void (*idle_func)(void *);
 	void  *idle_data;
+	enum   idle_sync_t idle_sync;
 };
 
-static GQueue idle_queue = G_QUEUE_INIT;
-static float queued   = 0.0;
-static float serviced = 0.0;
+static GThreadPool *idle_pool  = NULL;
+static GQueue       idle_queue = G_QUEUE_INIT;
+static unsigned int queued   = 0;
+static unsigned int serviced = 0;
 
 
+void __idle_run_task(struct idle_task *task)
+{
+	task->idle_func(task->idle_data);
+	g_free(task);
+	g_atomic_int_inc(&serviced);
+}
+
+void __idle_thread(gpointer task, gpointer data)
+{
+	__idle_run_task(task);
+}
+
+
+void idle_init()
+{
+	idle_pool = g_thread_pool_new(__idle_thread, NULL, 1, true, NULL);
+}
+
+void idle_deinit()
+{
+	struct idle_task *task;
+
+	while (!g_queue_is_empty(&idle_queue)) {
+		task = g_queue_pop_head(&idle_queue);
+		g_free(task);
+	}
+
+	if (idle_pool)
+		g_thread_pool_free(idle_pool, true, false);
+
+	queued   = 0;
+	serviced = 0;
+}
+
 void idle_schedule(enum idle_sync_t sync, void (*func)(void *), void *data)
 {
 	struct idle_task *task = g_malloc(sizeof(struct idle_task));
 	task->idle_func = func;
 	task->idle_data = data;
+	task->idle_sync = sync;
 
 	g_queue_push_tail(&idle_queue, task);
-	queued++;
+	g_atomic_int_inc(&queued);
 }
 
 bool idle_run_task()
@@ -31,31 +68,24 @@ bool idle_run_task()
 
 	if (!g_queue_is_empty(&idle_queue)) {
 		task = g_queue_pop_head(&idle_queue);
-		task->idle_func(task->idle_data);
-		g_free(task);
-		serviced++;
+		if (task->idle_sync == IDLE_ASYNC)
+			g_thread_pool_push(idle_pool, task, NULL);
+		else
+			__idle_run_task(task);
 	}
 
-	if (g_queue_is_empty(&idle_queue)) {
-		queued   = 0.0;
-		serviced = 0.0;
-	}
-	return !g_queue_is_empty(&idle_queue);
+	if (g_atomic_int_get(&queued) != g_atomic_int_get(&serviced))
+		return true;
+
+	queued   = 0;
+	serviced = 0;
+	return false;
 }
 
 float idle_progress()
 {
-	if (g_queue_is_empty(&idle_queue))
+	if (g_atomic_int_get(&serviced) == 0 &&
+	    g_atomic_int_get(&queued) == 0)
 		return 1.0;
-	return serviced / queued;
-}
-
-void idle_cancel()
-{
-	struct idle_task *task;
-
-	while (!g_queue_is_empty(&idle_queue)) {
-		task = g_queue_pop_head(&idle_queue);
-		g_free(task);
-	}
+	return (float)g_atomic_int_get(&serviced) / (float)queued;
 }

gui/idle.c

@@ -13,7 +13,7 @@ static gboolean __on_idle(gpointer data)
 
 	if (idle_run_task()) {
 		gtk_progress_bar_set_fraction(progress, idle_progress());
-		return gtk_widget_is_visible(gui_builder_widget("o_window"));
+		return G_SOURCE_CONTINUE;
 	} else {
 		gtk_widget_hide(GTK_WIDGET(progress));
 		idle_id = 0;
@@ -33,5 +33,4 @@ void gui_idle_disable()
 {
 	if (idle_id)
 		g_source_remove(idle_id);
-	idle_cancel();
 }

include/core/idle.h

@@ -17,10 +17,18 @@
 
 enum idle_sync_t {
 	IDLE_SYNC,  /* Run task in the main thread.   */
+	IDLE_ASYNC, /* Run task in a separate thread. */
 };
 
 #define IDLE_FUNC(x) ((void (*)(void *))x)
 
+
+/* Called to initialize the idle queue. */
+void idle_init();
+
+/* Called to deinitialize the idle queue. */
+void idle_deinit();
+
 /* Called to schedule a function to run later. */
 void idle_schedule(enum idle_sync_t, void (*)(void *), void *);
 
@@ -33,7 +41,4 @@ bool idle_run_task();
 /* Called to find the percentage of idle tasks that have been run. */
 float idle_progress();
 
-/* Called to cancel all idle tasks on the queue. */
-void idle_cancel();
-
 #endif /* OCARINA_CORE_IDLE_H */

tests/core/collection.c

@@ -57,11 +57,7 @@ static void test_add()
 	test_equal(lib->li_path, "tests/Music");
 
 	test_equal(queue_size(q), 0);
-	test_equal(idle_run_task(), (bool)true);  /* collection validation  */
-	test_equal(idle_run_task(), (bool)true);  /* tests/Music/           */
-	test_equal(idle_run_task(), (bool)true);  /* <DIR>/Hyrule Symphony/ */
-	test_equal(idle_run_task(), (bool)false); /* <DIR>/Ocarina of Time/ */
-
+	while (idle_run_task()) {};
 	test_equal(track_db_get()->db_size, 48);
 	test_equal(lib->li_size,  48);
 	test_equal(queue_size(q), 48);

tests/core/history.c

@@ -14,6 +14,7 @@ static void test_init()
 {
 	struct queue *q = history_get_queue();
 
+	idle_init();
 	filter_init();
 	tags_init();
 	playlist_init(NULL);

tests/core/idle.c

@@ -21,6 +21,8 @@ static void test_idle_queue(unsigned int n)
 {
 	cur = -1;
 
+	idle_init();
+
 	test_equal(idle_progress(), (float)1.0);
 	test_equal(idle_run_task(), (bool)false);
 
@@ -37,11 +39,18 @@ static void test_idle_queue(unsigned int n)
 	test_equal(idle_run_task(), (bool)false);
 	test_equal(idle_progress(), (float)1.0);
 
+	for (unsigned int i = n; i < (2 * n); i++)
+		idle_schedule(IDLE_ASYNC, inc_cur, GINT_TO_POINTER(i));
+	while (idle_run_task()) {}
+	test_equal(idle_progress(), (float)1.0);
+	test_equal(func_passed, (bool)true);
+	test_equal(cur, (2 * n) - 1);
+
 	for (unsigned int i = 0; i < n; i++)
 		idle_schedule(IDLE_SYNC, inc_cur, GINT_TO_POINTER(i));
 	test_equal(idle_progress(), (float)0.0);
 
-	idle_cancel();
+	idle_deinit();
 	test_equal(idle_progress(), (float)1.0);
 }
 

tests/core/tempq.c

@@ -13,6 +13,7 @@
 
 static void test_init()
 {
+	idle_init();
 	filter_init();
 	tags_init();
 	playlist_init(NULL);