io_thread: new thread for non-blocking background I/O

Try to eliminate the remaining blocking I/O.

1 files changed, 85 insertions, 0 deletions

diff --git a/src/io_thread.c b/src/io_thread.c
new file mode 100644
index 000000000..69d6fb71a
--- /dev/null
+++ b/src/io_thread.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "io_thread.h"
+
+#include <assert.h>
+
+static GMainContext *io_context;
+static GMainLoop *io_loop;
+static GThread *io_thread;
+
+static gpointer
+io_thread_func(G_GNUC_UNUSED gpointer arg)
+{
+	assert(io_context != NULL);
+	assert(io_loop != NULL);
+
+	g_main_loop_run(io_loop);
+	return NULL;
+}
+
+void
+io_thread_init(void)
+{
+	assert(io_context == NULL);
+	assert(io_loop == NULL);
+	assert(io_thread == NULL);
+
+	io_context = g_main_context_new();
+	io_loop = g_main_loop_new(io_context, false);
+}
+
+bool
+io_thread_start(GError **error_r)
+{
+	assert(io_context != NULL);
+	assert(io_loop != NULL);
+	assert(io_thread == NULL);
+
+	io_thread = g_thread_create(io_thread_func, NULL, true, error_r);
+	if (io_thread == NULL)
+		return false;
+
+	return true;
+}
+
+void
+io_thread_deinit(void)
+{
+	if (io_thread != NULL) {
+		assert(io_loop != NULL);
+
+		g_main_loop_quit(io_loop);
+		g_thread_join(io_thread);
+	}
+
+	if (io_loop != NULL)
+		g_main_loop_unref(io_loop);
+
+	if (io_context != NULL)
+		g_main_context_unref(io_context);
+}
+
+GMainContext *
+io_thread_context(void)
+{
+	return io_context;
+}
+