xiaoxiang781216 commented on code in PR #17573:
URL: https://github.com/apache/nuttx/pull/17573#discussion_r2675187984
##########
sched/sched/sched_processtimer.c:
##########
@@ -44,11 +44,108 @@
#include "sched/sched.h"
#include "wdog/wdog.h"
#include "clock/clock.h"
+#include "hrtimer/hrtimer.h"
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+#ifdef CONFIG_HRTIMER
+
+/* Scheduler-owned high-resolution timer instance.
+ *
+ * This timer acts as the time source for scheduler-related events:
+ *
+ * - Periodic scheduler ticks in non-tickless mode
+ * - Dynamic expiration points in tickless mode
+ *
+ * The timer is initialized lazily to avoid unnecessary setup when
+ * CONFIG_HRTIMER is enabled but not used immediately.
+ */
+
+static hrtimer_t g_nxsched_hrtimer;
Review Comment:
```
static hrtimer_t g_nxsched_hrtimer =
{
nxsched_hrtimer_callback,
};
```
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