main_notify: renamed source to event_pipe.c

We are going to migrate away from the concept of notifying the main
thread.  There should be events sent to it instead.  This patch starts
a series to implement that.

1 files changed, 85 insertions, 0 deletions

diff --git a/src/event_pipe.c b/src/event_pipe.c
new file mode 100644
index 00000000..ac76209d
--- /dev/null
+++ b/src/event_pipe.c
@@ -0,0 +1,85 @@
+/* the Music Player Daemon (MPD)
+ * Copyright (C) 2003-2007 Warren Dukes <warren.dukes@gmail.com>
+ * Copyright (C) 2008 Eric Wong <normalperson@yhbt.net>
+ *
+ * This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "event_pipe.h"
+#include "utils.h"
+#include "log.h"
+
+#include <assert.h>
+#include <glib.h>
+#include <string.h>
+
+static int main_pipe[2];
+GThread *main_task;
+
+static void consume_pipe(void)
+{
+	char buffer[256];
+	ssize_t r = read(main_pipe[0], buffer, sizeof(buffer));
+
+	if (r < 0 && errno != EAGAIN && errno != EINTR)
+		FATAL("error reading from pipe: %s\n", strerror(errno));
+}
+
+static gboolean
+main_notify_event(G_GNUC_UNUSED GIOChannel *source,
+		  G_GNUC_UNUSED GIOCondition condition,
+		  G_GNUC_UNUSED gpointer data)
+{
+	consume_pipe();
+	main_notify_triggered();
+	return true;
+}
+
+void init_main_notify(void)
+{
+	GIOChannel *channel;
+
+	main_task = g_thread_self();
+
+	if (pipe(main_pipe) < 0)
+		g_error("Couldn't open pipe: %s", strerror(errno));
+	if (set_nonblocking(main_pipe[1]) < 0)
+		g_error("Couldn't set non-blocking I/O: %s", strerror(errno));
+
+	channel = g_io_channel_unix_new(main_pipe[0]);
+	g_io_add_watch(channel, G_IO_IN, main_notify_event, NULL);
+	g_io_channel_unref(channel);
+
+	main_task = g_thread_self();
+}
+
+void deinit_main_notify(void)
+{
+	xclose(main_pipe[0]);
+	xclose(main_pipe[1]);
+}
+
+void wakeup_main_task(void)
+{
+	ssize_t w = write(main_pipe[1], "", 1);
+	if (w < 0 && errno != EAGAIN && errno != EINTR)
+		g_error("error writing to pipe: %s", strerror(errno));
+}
+
+void wait_main_task(void)
+{
+	consume_pipe();
+}