This version of isolation causes a deadlock for BDB (incorrect), but not for TokuDB (correct)

git-svn-id: file:///svn/toku/tokudb@16605 c7de825b-a66e-492c-adef-691d508d4ae1

src/tests/isolation.c

@@ -12,23 +12,43 @@ int test_main (int argc, char *argv[]) {
     toku_os_mkdir(ENVDIR, S_IRWXU+S_IRWXG+S_IRWXO);
     DB_ENV *env;
     r = db_env_create(&env, 0);                                                         CKERR(r);
+    env->set_errfile(env, stderr);
     r = env->open(env, ENVDIR, envflags, S_IRWXU+S_IRWXG+S_IRWXO);                      CKERR(r);
     
-    DB_TXN *txna;
-    r = env->txn_begin(env, NULL, &txna, 0);                                            CKERR(r);
-    env->set_errfile(env, stderr);
+    DB *db;
+    {
+	DB_TXN *txna;
+	r = env->txn_begin(env, NULL, &txna, 0);                                        CKERR(r);
+
+	r = db_create(&db, env, 0);                                                     CKERR(r);
+	r = db->open(db, txna, "foo.db", NULL, DB_BTREE, DB_CREATE, 0666);              CKERR(r);
+
+	DBT key,val;
+	r = db->put(db, txna, dbt_init(&key, "a", 4), dbt_init(&val, "a", 4), 0);       CKERR(r);
 
+	r = txna->commit(txna, 0);                                                      CKERR(r);
+    }
+    DB_TXN *txna, *txnx;
+    r = env->txn_begin(env, NULL, &txna, DB_READ_UNCOMMITTED);                          CKERR(r);
+    r = env->txn_begin(env, NULL, &txnx, 0);                                            CKERR(r);
+
+    // X writes a value, and B tries to read it in uncommitted
     {
 	DB_TXN *txnb;
-	r = env->txn_begin(env, txna, &txnb, 0);                                        CKERR(r);
+	r = env->txn_begin(env, txna, &txnb, DB_READ_UNCOMMITTED);                      CKERR(r);
+	{
+	    DBT key,val;
+	    r = db->put(db, txnx, dbt_init(&key, "x", 4), dbt_init(&val, "x", 4), 0);   CKERR(r);
+	    dbt_init_malloc(&val);
+	    r = db->get(db, txnb, dbt_init(&key, "x", 4), &val, 0);                     CKERR(r);
+	}
 	r = txnb->commit(txnb, 0);                                                      CKERR(r);
     }
-    {
-	DB_TXN *txnc;
-	r = env->txn_begin(env, txna, &txnc, DB_READ_UNCOMMITTED);                      CKERR(r);
-	r = txnc->commit(txnc, 0);                                                      CKERR(r);
-    }
+    r = txna->commit(txna, 0);                                                          CKERR(r);
+    r = txnx->commit(txnx, 0);                                                          CKERR(r);
 
+    r = db->close(db, 0);                                                               CKERR(r);
+    r = env->close(env, 0);                                                             CKERR(r);
     
     return 0;
 }