src/share/vm/gc/shared/workgroup.cpp

rev 11040 : 8155232: Augment Workgang to run task with a given number of threads
Summary: Add a method to run a WorkGang with a set number of threads.
Reviewed-by:
rev 11041 : [mq]: 8155232-stefank-review

@@ -253,11 +253,19 @@
 AbstractGangWorker* WorkGang::allocate_worker(uint worker_id) {
   return new GangWorker(this, worker_id);
 }
 
 void WorkGang::run_task(AbstractGangTask* task) {
-  _dispatcher->coordinator_execute_on_workers(task, active_workers());
+  run_task(task, active_workers());
+}
+
+void WorkGang::run_task(AbstractGangTask* task, uint num_workers) {
+  guarantee(num_workers <= active_workers(),
+            "Trying to execute task %s with %u workers which is more than the amount of active workers %u.",
+            task->name(), num_workers, active_workers());
+  guarantee(num_workers > 0, "Trying to execute task %s with zero workers", task->name());
+  _dispatcher->coordinator_execute_on_workers(task, num_workers);
 }
 
 AbstractGangWorker::AbstractGangWorker(AbstractWorkGang* gang, uint id) {
   _gang = gang;
   set_id(id);