Merge pull request #5058 from 0x6d61726b/patch-2

CircularBuffer(): get available transactions

Author: 0xc0170

platform/CircularBuffer.h

@@ -109,6 +109,23 @@ class CircularBuffer {
         core_util_critical_section_exit();
     }
 
+    /** Get the number of elements currently stored in the circular_buffer */
+    CounterType size() const {
+        core_util_critical_section_enter();
+        CounterType elements;
+        if (!_full) {
+            if (_head < _tail) {
+                elements = BufferSize + _head - _tail;
+            } else {
+                elements = _head - _tail;
+            }
+        } else {
+            elements = BufferSize;
+        }
+        core_util_critical_section_exit();
+        return elements;
+    }
+    
 private:
     T _pool[BufferSize];
     volatile CounterType _head;