8029326: G1 does not check if threads gets created

Reviewed-by: brutisso, jmasa, jwilhelm

src/share/vm/gc_implementation/g1/concurrentG1Refine.cpp

@@ -27,6 +27,7 @@
 #include "gc_implementation/g1/concurrentG1RefineThread.hpp"
 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
 #include "gc_implementation/g1/g1HotCardCache.hpp"
+#include "runtime/java.hpp"
 
 ConcurrentG1Refine::ConcurrentG1Refine(G1CollectedHeap* g1h) :
   _threads(NULL), _n_threads(0),
@@ -62,6 +63,10 @@ ConcurrentG1Refine::ConcurrentG1Refine(G1CollectedHeap* g1h) :
   for (int i = _n_threads - 1; i >= 0; i--) {
     ConcurrentG1RefineThread* t = new ConcurrentG1RefineThread(this, next, worker_id_offset, i);
     assert(t != NULL, "Conc refine should have been created");
+    if (t->osthread() == NULL) {
+        vm_shutdown_during_initialization("Could not create ConcurrentG1RefineThread");
+    }
+
     assert(t->cg1r() == this, "Conc refine thread should refer to this");
     _threads[i] = t;
     next = t;

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

@@ -553,6 +553,9 @@ ConcurrentMark::ConcurrentMark(G1CollectedHeap* g1h, ReservedSpace heap_rs) :
   _cmThread = new ConcurrentMarkThread(this);
   assert(cmThread() != NULL, "CM Thread should have been created");
   assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm");
+  if (_cmThread->osthread() == NULL) {
+      vm_shutdown_during_initialization("Could not create ConcurrentMarkThread");
+  }
 
   assert(CGC_lock != NULL, "Where's the CGC_lock?");
   assert(_markBitMap1.covers(heap_rs), "_markBitMap1 inconsistency");