38   // less than, equal to, or greater than active workers.  If greater than
  39   // or equal to active_workers, nothing is done.
  40   //   worker_type - type of thread.
  41   //   initializing - true if this is called to get the initial number of
  42   // GC workers.
  43   // If initializing is true, do a vm exit if the workers cannot be created.
  44   // The initializing = true case is for JVM start up and failing to
  45   // create all the worker at start should considered a problem so exit.
  46   // If initializing = false, there are already some number of worker
  47   // threads and a failure would not be optimal but should not be fatal.
  48   template <class WorkerType>
  49   static uint add_workers (WorkerType* holder,
  50                    uint active_workers,
  51                    uint total_workers,
  52                    uint created_workers,
  53                    os::ThreadType worker_type,
  54                    bool initializing) {
  55     uint start = created_workers;
  56     uint end = MIN2(active_workers, total_workers);
  57     for (uint worker_id = start; worker_id < end; worker_id += 1) {
  58       WorkerThread* new_worker = holder->install_worker(worker_id);
  59       assert(new_worker != NULL, "Failed to allocate GangWorker");


  60       if (new_worker == NULL || !os::create_thread(new_worker, worker_type)) {
  61         if(initializing) {
  62           vm_exit_out_of_memory(0, OOM_MALLOC_ERROR,
  63                   "Cannot create worker GC thread. Out of system resources.");





  64         }

  65       }
  66       created_workers++;
  67       os::start_thread(new_worker);
  68     }
  69 
  70     log_trace(gc, task)("AdaptiveSizePolicy::add_workers() : "
  71        "active_workers: %u created_workers: %u",
  72        active_workers, created_workers);
  73 
  74     return created_workers;
  75   }
  76 };
  77 #endif // SHARE_VM_GC_SHARED_WORKERMANAGER_HPP

  38   // less than, equal to, or greater than active workers.  If greater than
  39   // or equal to active_workers, nothing is done.
  40   //   worker_type - type of thread.
  41   //   initializing - true if this is called to get the initial number of
  42   // GC workers.
  43   // If initializing is true, do a vm exit if the workers cannot be created.
  44   // The initializing = true case is for JVM start up and failing to
  45   // create all the worker at start should considered a problem so exit.
  46   // If initializing = false, there are already some number of worker
  47   // threads and a failure would not be optimal but should not be fatal.
  48   template <class WorkerType>
  49   static uint add_workers (WorkerType* holder,
  50                            uint active_workers,
  51                            uint total_workers,
  52                            uint created_workers,
  53                            os::ThreadType worker_type,
  54                            bool initializing) {
  55     uint start = created_workers;
  56     uint end = MIN2(active_workers, total_workers);
  57     for (uint worker_id = start; worker_id < end; worker_id += 1) {
  58       WorkerThread* new_worker = NULL;
  59       if (initializing || !InjectGCWorkerCreationFailure) {
  60         new_worker = holder->install_worker(worker_id);
  61       }
  62       if (new_worker == NULL || !os::create_thread(new_worker, worker_type)) {
  63         log_trace(gc, task)("WorkerManager::add_workers() : "
  64                             "creation failed due to failed allocation of native %s",
  65                             new_worker == NULL ?  "memory" : "thread");
  66         if (new_worker != NULL) {
  67            delete new_worker;
  68         }
  69         if (initializing) {
  70           vm_exit_out_of_memory(0, OOM_MALLOC_ERROR, "Cannot create worker GC thread. Out of system resources.");
  71         }
  72         break;
  73       }
  74       created_workers++;
  75       os::start_thread(new_worker);
  76     }
  77 
  78     log_trace(gc, task)("WorkerManager::add_workers() : "
  79                         "created_workers: %u", created_workers);

  80 
  81     return created_workers;
  82   }
  83 };
  84 #endif // SHARE_VM_GC_SHARED_WORKERMANAGER_HPP