hujun260 commented on code in PR #16673:
URL: https://github.com/apache/nuttx/pull/16673#discussion_r2227122134
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sched/sched/sched_addreadytorun.c:
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@@ -114,14 +114,98 @@ bool nxsched_add_readytorun(FAR struct tcb_s *btcb)
return ret;
}
-#endif /* !CONFIG_SMP */
+
+#else /* !CONFIG_SMP */
+
+/****************************************************************************
+ * Name: nxsched_switch_running
+ *
+ * Description:
+ * This function switches the head of the current CPU's assigned tasks
+ * list to the TCB given as parameter. The idle task is not switched out.
+ * If the running task can't be swapped out, the btcb is pushed to
+ * the ready-to-run list.
+ *
+ * Input Parameters:
+ * btcb - Points to the TCB that is ready-to-run
+ * cpu - Always this_cpu(). Given as argument only for optimization
+ *
+ * Returned Value:
+ * true if the currently active task is switched to the btcb
+ *
+ * Assumptions:
+ * - The caller has established a critical section
+ * - The caller has already removed the input rtcb from whatever list it
+ * was in.
+ * - The caller handles the condition that occurs if the head of the
+ * assigned tasks list has changed.
+ *
+ ****************************************************************************/
+
+bool nxsched_switch_running(int cpu)
+{
+ FAR struct tcb_s *rtcb = current_task(cpu);
+ int sched_priority = rtcb->sched_priority;
+ FAR struct tcb_s *btcb;
+ bool ret = false;
+
+ DEBUGASSERT(cpu == this_cpu());
+
+ if (nxsched_islocked_tcb(rtcb))
+ {
+ return false;
+ }
+
+ /* If there is a task in readytorun list, which is eglible to run on this
+ * CPU, and has higher priority than the current task,
+ * switch the current task to that one.
+ */
+
+ for (btcb = (FAR struct tcb_s *)dq_peek(list_readytorun());
+ btcb && btcb->sched_priority >= sched_priority;
Review Comment:
btcb->sched_priority > sched_priority;
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