Add generic UI countdown timer

[petitboot] / ui / common / timer.c

diff --git a/ui/common/timer.c b/ui/common/timer.c
new file mode 100644 (file)
index 0000000..954a18a
--- /dev/null
+++ b/ui/common/timer.c
@@ -0,0 +1,139 @@
+/*
+ *  Copyright (C) 2009 Sony Computer Entertainment Inc.
+ *  Copyright 2009 Sony Corp.
+ *
+ *  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; version 2 of the License.
+ *
+ *  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
+ */
+
+#if defined(HAVE_CONFIG_H)
+#include "config.h"
+#endif
+
+#define _GNU_SOURCE
+#include <assert.h>
+#include <limits.h>
+#include <unistd.h>
+
+#include "log/log.h"
+#include "timer.h"
+
+/**
+ * ui_timer_init - Initialize the timer for use.
+ * @seconds: The final timeout value in seconds.
+ */
+
+void ui_timer_init(struct ui_timer *timer, unsigned int seconds)
+{
+       pb_log("%s: %u\n", __func__, seconds);
+       assert(!timer->disabled);
+       timer->timeout = seconds;
+}
+
+/**
+ * ui_timer_next - Calculate the next timer interval.
+ */
+
+static unsigned int ui_timer_next(unsigned int seconds)
+{
+       unsigned int next;
+
+       if (seconds == 0) {
+               next = 0;
+               goto done;
+       }
+
+       if (seconds <= 10) {
+               next = 1;
+               goto done;
+       }
+
+       if (seconds <= 60) {
+               next = seconds % 5;
+               next = next ? next : 5;
+               goto done;
+       }
+
+       next = seconds % 10;
+       next = next ? next : 10;
+
+done:
+       pb_log("%s: %u = %u\n", __func__, seconds, next);
+       return next;
+}
+
+/**
+ * ui_timer_kick - Kickstart the next timer interval.
+ */
+
+void ui_timer_kick(struct ui_timer *timer)
+{
+       unsigned int next;
+
+       if(timer->disabled)
+               return;
+
+       if (timer->update_display)
+               timer->update_display(timer, timer->timeout);
+
+       next = ui_timer_next(timer->timeout);
+       timer->timeout -= next;
+
+       if (next) {
+               alarm(next);
+               return;
+       }
+
+       pb_log("%s: timed out\n", __func__);
+
+       ui_timer_disable(timer);
+       timer->handle_timeout(timer);
+}
+
+/**
+ * ui_timer_disable - Stop and disable the timer.
+ */
+
+void ui_timer_disable(struct ui_timer *timer)
+{
+       if (timer->disabled)
+               return;
+
+       pb_log("%s\n", __func__);
+       timer->disabled = 1;
+       timer->timeout = UINT_MAX;
+       alarm(0);
+}
+
+/**
+ * ui_timer_sigalrm
+ *
+ * Called at SIGALRM.
+ */
+
+void ui_timer_sigalrm(struct ui_timer *timer)
+{
+       timer->signaled = 1;
+}
+
+/**
+ * ui_timer_process_sig - Process a timer signal
+ */
+
+void ui_timer_process_sig(struct ui_timer *timer)
+{
+       while (timer->signaled) {
+               timer->signaled = 0;
+               ui_timer_kick(timer);
+       }
+}