test/hotspot/gtest/utilities/test_concurrentHashtable.cpp

rev 50281 : 8195097: Make it possible to process StringTable outside safepoint
Reviewed-by:

*** 263,272 ****
--- 263,306 ----
    EXPECT_TRUE(cht->remove(thr, stl)) << "Removing a pre-existing value failed.";
    EXPECT_FALSE(cht->get_copy(thr, stl) == val) << "Got a removed value.";
    delete cht;
  }
  
+ struct ChtCountScan {
+   size_t _count;
+   ChtCountScan() : _count(0) {}
+   bool operator()(uintptr_t* val) {
+     _count++;
+     return true; /* continue scan */
+   }
+ };
+ 
+ static void cht_move_to(Thread* thr) {
+   uintptr_t val1 = 0x2;
+   uintptr_t val2 = 0xe0000002;
+   uintptr_t val3 = 0x3;
+   SimpleTestLookup stl1(val1), stl2(val2), stl3(val3);
+   SimpleTestTable* from_cht = new SimpleTestTable();
+   EXPECT_TRUE(from_cht->insert(thr, stl1, val1)) << "Insert unique value failed.";
+   EXPECT_TRUE(from_cht->insert(thr, stl2, val2)) << "Insert unique value failed.";
+   EXPECT_TRUE(from_cht->insert(thr, stl3, val3)) << "Insert unique value failed.";
+ 
+   SimpleTestTable* to_cht = new SimpleTestTable();
+   EXPECT_TRUE(from_cht->try_move_nodes_to(thr, to_cht)) << "Moving nodes to new table failed";
+ 
+   ChtCountScan scan_old;
+   EXPECT_TRUE(from_cht->try_scan(thr, scan_old)) << "Scanning table should work.";
+   EXPECT_EQ(scan_old._count, (size_t)0) << "All items should be moved";
+ 
+   ChtCountScan scan_new;
+   EXPECT_TRUE(to_cht->try_scan(thr, scan_new)) << "Scanning table should work.";
+   EXPECT_EQ(scan_new._count, (size_t)3) << "All items should be moved";
+   EXPECT_TRUE(to_cht->get_copy(thr, stl1) == val1) << "Getting an inserted value should work.";
+   EXPECT_TRUE(to_cht->get_copy(thr, stl2) == val2) << "Getting an inserted value should work.";
+   EXPECT_TRUE(to_cht->get_copy(thr, stl3) == val3) << "Getting an inserted value should work.";
+ }
+ 
  static void cht_grow(Thread* thr) {
    uintptr_t val = 0x2;
    uintptr_t val2 = 0x22;
    uintptr_t val3 = 0x222;
    SimpleTestLookup stl(val), stl2(val2), stl3(val3);
*** 369,378 ****
--- 403,416 ----
  
  TEST_VM(ConcurrentHashTable, basic_scan) {
    nomt_test_doer(cht_scan);
  }
  
+ TEST_VM(ConcurrentHashTable, basic_move_to) {
+   nomt_test_doer(cht_move_to);
+ }
+ 
  TEST_VM(ConcurrentHashTable, basic_grow) {
    nomt_test_doer(cht_grow);
  }
  
  TEST_VM(ConcurrentHashTable, task_grow) {