src/share/vm/gc_implementation/g1/vm_operations_g1.cpp

rev 7267 : 8062036: ConcurrentMarkThread::slt may be invoked before ConcurrentMarkThread::makeSurrogateLockerThread causing intermittent crashes
Summary: Suppress gc_alot during VM init, improve error for SLT uninitialized.
Reviewed-by: jmasa, brutisso

*** 211,221 ****
  
  void VM_CGC_Operation::acquire_pending_list_lock() {
    assert(_needs_pll, "don't call this otherwise");
    // The caller may block while communicating
    // with the SLT thread in order to acquire/release the PLL.
!   if (SurrogateLockerThread* slt = ConcurrentMarkThread::slt()) {
      slt->manipulatePLL(SurrogateLockerThread::acquirePLL);
    } else {
      SurrogateLockerThread::report_missing_slt();
    }
  }
--- 211,222 ----
  
  void VM_CGC_Operation::acquire_pending_list_lock() {
    assert(_needs_pll, "don't call this otherwise");
    // The caller may block while communicating
    // with the SLT thread in order to acquire/release the PLL.
!   SurrogateLockerThread* slt = ConcurrentMarkThread::slt();
!   if (slt != NULL) {
      slt->manipulatePLL(SurrogateLockerThread::acquirePLL);
    } else {
      SurrogateLockerThread::report_missing_slt();
    }
  }