From a0e2b0c5a247beaf201c6e49a3221c7e04e306e9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Beat=20K=C3=BCng?= <beat-kueng@gmx.net>
Date: Fri, 24 Mar 2017 17:01:16 +0100
Subject: [PATCH] param: add param_control_autosave to enable/disable autosave

---
 src/modules/systemlib/param/param.c       | 15 +++++++++++++++
 src/modules/systemlib/param/param.h       |  8 ++++++++
 src/modules/systemlib/param/param_shmem.c | 15 +++++++++++++++
 3 files changed, 38 insertions(+)

diff --git a/src/modules/systemlib/param/param.c b/src/modules/systemlib/param/param.c
index 37ad429f85..7800dde4cc 100644
--- a/src/modules/systemlib/param/param.c
+++ b/src/modules/systemlib/param/param.c
@@ -639,6 +639,21 @@ static void param_autosave(void)
 	autosave_scheduled = true;
 	work_queue(LPWORK, &autosave_work, (worker_t)&autosave_worker, NULL, USEC2TICK(delay));
 }
+
+void
+param_control_autosave(bool enable)
+{
+	param_lock_writer();
+
+	if (!enable && autosave_scheduled) {
+		work_cancel(LPWORK, &autosave_work);
+		autosave_scheduled = false;
+	}
+
+	autosave_disabled = !enable;
+	param_unlock_writer();
+}
+
 static int
 param_set_internal(param_t param, const void *val, bool mark_saved, bool notify_changes)
 {
diff --git a/src/modules/systemlib/param/param.h b/src/modules/systemlib/param/param.h
index 09889b2ef8..c2d5c06adb 100644
--- a/src/modules/systemlib/param/param.h
+++ b/src/modules/systemlib/param/param.h
@@ -383,6 +383,14 @@ __EXPORT int 		param_load_default(void);
  */
 __EXPORT uint32_t	param_hash_check(void);
 
+
+/**
+ * Enable/disable the param autosaving.
+ * Re-enabling with changed params will not cause an autosave.
+ * @param enable true: enable autosaving, false: disable autosaving
+ */
+__EXPORT void	param_control_autosave(bool enable);
+
 /*
  * Macros creating static parameter definitions.
  *
diff --git a/src/modules/systemlib/param/param_shmem.c b/src/modules/systemlib/param/param_shmem.c
index ab4aecae25..390ce7c9be 100644
--- a/src/modules/systemlib/param/param_shmem.c
+++ b/src/modules/systemlib/param/param_shmem.c
@@ -640,6 +640,21 @@ static void param_autosave(void)
 	autosave_scheduled = true;
 	work_queue(LPWORK, &autosave_work, (worker_t)&autosave_worker, NULL, USEC2TICK(delay));
 }
+
+void
+param_control_autosave(bool enable)
+{
+	param_lock();
+
+	if (!enable && autosave_scheduled) {
+		work_cancel(LPWORK, &autosave_work);
+		autosave_scheduled = false;
+	}
+
+	autosave_disabled = !enable;
+	param_unlock();
+}
+
 static int
 param_set_internal(param_t param, const void *val, bool mark_saved, bool notify_changes)
 {