davids5 commented on a change in pull request #5504:
URL: https://github.com/apache/incubator-nuttx/pull/5504#discussion_r806782591
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File path: mm/mm_heap/mm_sem.c
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@@ -104,9 +104,23 @@ bool mm_takesemaphore(FAR struct mm_heap_s *heap)
#if defined(CONFIG_BUILD_FLAT) || defined(__KERNEL__)
else if (sched_idletask())
{
- /* Try to take the semaphore */
+ return false;
+ }
+ else if (up_interrupt_context())
+ {
+ int val;
+
+#ifdef CONFIG_SMP
+ return false;
+#endif
+
+ /* Check the semaphore value, if held by someone, then return false.
+ * Else, we can take it, return true.
+ */
- return _SEM_TRYWAIT(&heap->mm_semaphore) >= 0;
+ _SEM_GETVALUE(&heap->mm_semaphore, &val);
+
+ return val > 0;
Review comment:
There is an opportunity to return false for SMP on entry - why not use
it?
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