148     node = BufferNode::allocate(_buffer_size);

   148     node = BufferNode::allocate(_buffer_size);

   149   } else {

   149   } else {

   150     // Decrement count after getting buffer from free list.  This, along

   150     // Decrement count after getting buffer from free list.  This, along

   151     // with incrementing count before adding to free list, ensures count

   151     // with incrementing count before adding to free list, ensures count

   152     // never underflows.

   152     // never underflows.

   154     assert((count + 1) != 0, "_free_count underflow");

   154     assert((count + 1) != 0, "_free_count underflow");

   155   }

   155   }

   156   return node;

   156   return node;

   157 }

   157 }

   158 

   158 

   210     size_t count = 1;

   210     size_t count = 1;

   211     for (BufferNode* next = first->next(); next != NULL; next = next->next()) {

   211     for (BufferNode* next = first->next(); next != NULL; next = next->next()) {

   212       last = next;

   212       last = next;

   213       ++count;

   213       ++count;

   214     }

   214     }

   216 

   216 

   217     // Wait for any in-progress pops, to avoid ABA for them.

   217     // Wait for any in-progress pops, to avoid ABA for them.

   218     GlobalCounter::write_synchronize();

   218     GlobalCounter::write_synchronize();

   219 

   219 

   220     // Add synchronized nodes to _free_list.

   220     // Add synchronized nodes to _free_list.

   234   for ( ; removed < remove_goal; ++removed) {

   234   for ( ; removed < remove_goal; ++removed) {

   235     BufferNode* node = _free_list.pop();

   235     BufferNode* node = _free_list.pop();

   236     if (node == NULL) break;

   236     if (node == NULL) break;

   237     BufferNode::deallocate(node);

   237     BufferNode::deallocate(node);

   238   }

   238   }

   240   log_debug(gc, ptrqueue, freelist)

   240   log_debug(gc, ptrqueue, freelist)

   241            ("Reduced %s free list by " SIZE_FORMAT " to " SIZE_FORMAT,

   241            ("Reduced %s free list by " SIZE_FORMAT " to " SIZE_FORMAT,

   242             name(), removed, new_count);

   242             name(), removed, new_count);

   243   return removed;

   243   return removed;

   244 }

   244 }