src/hotspot/share/gc/g1/g1FreeIdSet.hpp

rev 53151 : [mq]: tschatzl_review

@@ -27,11 +27,15 @@
 
 #include "memory/allocation.hpp"
 #include "runtime/semaphore.hpp"
 #include "utilities/globalDefinitions.hpp"
 
-// Represents a set of free small integer ids.
+// Represents a set of small integer ids, from which elements can be
+// temporarily allocated for exclusive use.  The ids are in a
+// contiguous range from 'start' to 'start + size'.  Used to obtain a
+// distinct worker_id value for a mutator thread that doesn't normally
+// have such an id.
 class G1FreeIdSet : public CHeapObj<mtGC> {
   Semaphore _sem;
   uint* _next;
   uint _start;
   uint _size;