1 files changed, 56 insertions, 0 deletions
diff --git a/src/libs/callback/async.c b/src/libs/callback/async.c
new file mode 100644
index 0000000..d901158
--- /dev/null
+++ b/src/libs/callback/async.c
@@ -0,0 +1,56 @@
+/*
+ *  Copyright 2012  Serge van den Boom <svdb@stack.nl>
+ *
+ *  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 "async.h"
+
+#include "libs/alarm.h"
+#include "libs/callback.h"
+
+
+// Process all alarms and callbacks.
+// First, all scheduled callbacks are called.
+// Then each alarm due is called, and after each of these alarms, the
+// callbacks scheduled by this alarm are called.
+void
+Async_process(void)
+{
+	// Call pending callbacks.
+	Callback_process();
+
+	for (;;) {
+		if (!Alarm_processOne())
+			return;
+
+		// Call callbacks scheduled from the last alarm.
+		Callback_process();
+	}
+}
+
+// Returns the next time that some asynchronous callback is
+// to be called. Note that all values lower than the current time
+// should be considered as 'somewhere in the past'.
+uint32
+Async_timeBeforeNextMs(void) {
+	if (Callback_haveMore()) {
+		// Any time before the current time is ok, though we reserve 0 so
+		// that the caller may use it as a special value in its own code.
+		return 1;
+	}
+	return Alarm_timeBeforeNextMs();
+}
+