xiaoxiang781216 commented on a change in pull request #1663:
URL: https://github.com/apache/incubator-nuttx/pull/1663#discussion_r479759276



##########
File path: arch/sim/src/sim/up_hostirq.c
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@@ -86,3 +112,44 @@ void up_irq_restore(uint64_t flags)
 void up_irqinitialize(void)
 {
 }
+
+/****************************************************************************
+ * Name: up_enable_irq
+ *
+ * Description:
+ *   Enable the IRQ specified by 'irq'
+ *
+ ****************************************************************************/
+
+void up_enable_irq(int irq)

Review comment:
       It's good to unmask the signal on all threads because we can simulate 
the hardware behaviour more closely.




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