From 3af6b3c3e2f57e1a0447e81a9de50ba7f8c36b2b Mon Sep 17 00:00:00 2001
From: Abhishek Sagar <sachinites@gmail.com>
Date: Tue, 27 Oct 2020 04:43:13 -0700
Subject: [PATCH] Added API to get the timer state - running or not.

---
 WheelTimer/libtimer/Course/timerlib.c      | 48 ++++++++++++++++++++++
 WheelTimer/libtimer/Course/timerlib_test.c |  2 +-
 WheelTimer/libtimer/timerlib.c             | 14 +++++++
 WheelTimer/libtimer/timerlib.h             |  4 ++
 4 files changed, 67 insertions(+), 1 deletion(-)

diff --git a/WheelTimer/libtimer/Course/timerlib.c b/WheelTimer/libtimer/Course/timerlib.c
index 57d0ade..d008e95 100644
--- a/WheelTimer/libtimer/Course/timerlib.c
+++ b/WheelTimer/libtimer/Course/timerlib.c
@@ -55,6 +55,15 @@ timer_callback_wrapper(union sigval arg){
 
 	Timer_t *timer = (Timer_t *)(arg.sival_ptr);
 
+	
+    if((timer->timer_state) == TIMER_RESUMED){
+
+		if(timer->sec_exp_timer != 0){
+		timer->timer_state = TIMER_RUNNING;
+		}
+	}
+
+
 	/* invoke the user provided callback fn */
 	(timer->cb)(timer, timer->user_arg);
 }
@@ -120,3 +129,42 @@ start_timer(Timer_t *timer){
     timer_set_state(timer, TIMER_RUNNING);
 }
 
+unsigned long
+timer_get_time_remaining_in_mill_sec(Timer_t *timer){
+
+    struct itimerspec remaining_time;
+
+    memset(&remaining_time, 0, sizeof(struct itimerspec));
+
+    timer_gettime(timer->posix_timer, &remaining_time);
+
+    return timespec_to_millisec(&remaining_time.it_value);
+}
+
+
+void
+pause_timer(Timer_t *timer){
+
+    timer->time_remaining =
+        timer_get_time_remaining_in_mill_sec(timer);
+
+    timer_fill_itimerspec(&timer->ts.it_value, 0);
+    timer_fill_itimerspec(&timer->ts.it_interval, 0);
+
+    resurrect_timer(timer);
+
+    timer_set_state(timer, TIMER_PAUSED);
+}
+
+void
+resume_timer(Timer_t *timer){
+
+    assert(timer_get_current_state(timer) == TIMER_PAUSED);
+
+    timer_fill_itimerspec(&timer->ts.it_value, timer->time_remaining);
+    timer_fill_itimerspec(&timer->ts.it_interval, timer->sec_exp_timer);
+    timer->time_remaining    = 0;
+
+    resurrect_timer(timer);
+    timer_set_state(timer, TIMER_RESUMED);
+}
diff --git a/WheelTimer/libtimer/Course/timerlib_test.c b/WheelTimer/libtimer/Course/timerlib_test.c
index 219a5c1..5cb59e1 100644
--- a/WheelTimer/libtimer/Course/timerlib_test.c
+++ b/WheelTimer/libtimer/Course/timerlib_test.c
@@ -58,7 +58,7 @@ main(int argc, char **argv){
 		case 8:
 			//print_timer(timer);
 			break;
-		deafault:	;
+		default:	;
 	}
 	}
 	pause();
diff --git a/WheelTimer/libtimer/timerlib.c b/WheelTimer/libtimer/timerlib.c
index 4d0ad3c..0ff9aac 100644
--- a/WheelTimer/libtimer/timerlib.c
+++ b/WheelTimer/libtimer/timerlib.c
@@ -302,3 +302,17 @@ print_timer(Timer_t *timer){
 		timer_get_current_state(timer));
 }
 
+bool
+is_timer_running(Timer_t *timer){
+
+	TIMER_STATE_T timer_state;
+
+	timer_state = timer_get_current_state(timer);
+
+	if(timer_state == TIMER_RUNNING ||
+		timer_state == TIMER_RESUMED) {
+		return true;
+	}
+	return false;
+}
+
diff --git a/WheelTimer/libtimer/timerlib.h b/WheelTimer/libtimer/timerlib.h
index df7d2d7..9078f48 100644
--- a/WheelTimer/libtimer/timerlib.h
+++ b/WheelTimer/libtimer/timerlib.h
@@ -137,4 +137,8 @@ timespec_to_millisec(
 void
 timer_fill_itimerspec(struct timespec *ts,
                       unsigned long msec);
+
+bool
+is_timer_running(Timer_t *timer);
+
 #endif /* __TIMER_WRAP__  */