mdbx-testing: добавление extra/cursor_closing.

test/CMakeLists.txt

@@ -279,6 +279,7 @@ else()
     endif()
     if(MDBX_BUILD_CXX)
       if(NOT WIN32 OR NOT MDBX_CXX_STANDARD LESS 17)
+        add_extra_test(cursor_closing)
         add_extra_test(early_close_dbi)
         add_extra_test(maindb_ordinal)
         add_extra_test(dupfix_multiple)

test/extra/cursor_closing.c++

@@ -0,0 +1,59 @@
+#include "mdbx.h++"
+
+#include <iostream>
+
+static void logger_nofmt(MDBX_log_level_t loglevel, const char *function,
+                         int line, const char *msg, unsigned length) noexcept {
+  (void)length;
+  (void)loglevel;
+  std::cout << function << ":" << line << " " << msg;
+}
+
+static char log_buffer[1024];
+
+int main(int argc, const char *argv[]) {
+  (void)argc;
+  (void)argv;
+
+  mdbx_setup_debug_nofmt(MDBX_LOG_NOTICE, MDBX_DBG_ASSERT, logger_nofmt,
+                         log_buffer, sizeof(log_buffer));
+
+  mdbx::path db_filename = "test-cursor-closing";
+  mdbx::env::remove(db_filename);
+
+  mdbx::env_managed env(
+      db_filename, mdbx::env_managed::create_parameters(),
+      mdbx::env::operate_parameters(42, 0, mdbx::env::nested_transactions));
+
+  {
+    auto txn = env.start_write();
+    auto table = txn.create_map("dummy", mdbx::key_mode::usual,
+                                mdbx::value_mode::single);
+    auto cursor_1 = txn.open_cursor(table);
+    auto cursor_2 = cursor_1.clone();
+
+    auto nested = env.start_write(txn);
+    auto nested_cursor_1 = nested.open_cursor(table);
+    auto nested_cursor_2 = nested_cursor_1.clone();
+    auto nested_cursor_3 = cursor_1.clone();
+
+    auto deep = env.start_write(nested);
+    auto deep_cursor_1 = deep.open_cursor(table);
+    auto deep_cursor_2 = nested_cursor_1.clone();
+    auto deep_cursor_3 = cursor_1.clone();
+    deep_cursor_1.close();
+    deep.commit();
+    deep_cursor_2.close();
+
+    nested_cursor_1.close();
+    nested.abort();
+    nested_cursor_2.close();
+
+    cursor_1.close();
+    txn.commit();
+    cursor_2.close();
+  }
+
+  std::cout << "OK\n";
+  return EXIT_SUCCESS;
+}