diff --git a/runtime/bin/ffi_test/ffi_test_functions_vmspecific.cc b/runtime/bin/ffi_test/ffi_test_functions_vmspecific.cc
index 9ecaa7ec688..77ab3511f53 100644
--- a/runtime/bin/ffi_test/ffi_test_functions_vmspecific.cc
+++ b/runtime/bin/ffi_test/ffi_test_functions_vmspecific.cc
@@ -894,16 +894,11 @@ DART_EXPORT void ThreadPoolTest_BarrierSync(
   dart_exit_isolate();
   {
     std::unique_lock<std::mutex> lock(mutex);
-
     ++thread_count;
-    if (thread_count < num_threads) {
-      while (thread_count < num_threads) {
-        cvar.wait(lock);
-      }
-    } else {
-      if (thread_count != num_threads) FATAL("bug");
-      cvar.notify_all();
+    while (thread_count < num_threads) {
+      cvar.wait(lock);
     }
+    cvar.notify_all();
   }
   dart_enter_isolate(isolate);
 }
@@ -1282,6 +1277,11 @@ DART_EXPORT void SetFfiNativeResolverForTest(Dart_Handle url) {
   ENSURE(!Dart_IsError(result));
 }
 
+DART_EXPORT void WaitUntilNThreadsEnterBarrier(intptr_t num_threads) {
+  ThreadPoolTest_BarrierSync(Dart_CurrentIsolate_DL, Dart_EnterIsolate_DL,
+                             Dart_ExitIsolate_DL, num_threads);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // Helper for the regression test for b/216834909
 ////////////////////////////////////////////////////////////////////////////////
diff --git a/runtime/include/dart_api_dl.h b/runtime/include/dart_api_dl.h
index ba50d992369..cce34500947 100644
--- a/runtime/include/dart_api_dl.h
+++ b/runtime/include/dart_api_dl.h
@@ -90,6 +90,10 @@ typedef void (*Dart_NativeMessageHandler_DL)(Dart_Port_DL dest_port_id,
   F(Dart_UpdateFinalizableExternalSize, void,                                  \
     (Dart_FinalizableHandle object, Dart_Handle strong_ref_to_object,          \
      intptr_t external_allocation_size))                                       \
+  /* Isolates */                                                               \
+  F(Dart_CurrentIsolate, Dart_Isolate, (void))                                 \
+  F(Dart_ExitIsolate, void, (void))                                            \
+  F(Dart_EnterIsolate, void, (Dart_Isolate))                                   \
   /* Dart_Port */                                                              \
   F(Dart_Post, bool, (Dart_Port_DL port_id, Dart_Handle object))               \
   F(Dart_NewSendPort, Dart_Handle, (Dart_Port_DL port_id))                     \
diff --git a/runtime/include/dart_version.h b/runtime/include/dart_version.h
index 680fb539bbe..e2d3651fbd3 100644
--- a/runtime/include/dart_version.h
+++ b/runtime/include/dart_version.h
@@ -11,6 +11,6 @@
 // On backwards compatible changes the minor version is increased.
 // The versioning covers the symbols exposed in dart_api_dl.h
 #define DART_API_DL_MAJOR_VERSION 2
-#define DART_API_DL_MINOR_VERSION 2
+#define DART_API_DL_MINOR_VERSION 3
 
 #endif /* RUNTIME_INCLUDE_DART_VERSION_H_ */ /* NOLINT */
diff --git a/tests/ffi/dl_api_exit_enter_isolate_test.dart b/tests/ffi/dl_api_exit_enter_isolate_test.dart
new file mode 100644
index 00000000000..5842cc8ba72
--- /dev/null
+++ b/tests/ffi/dl_api_exit_enter_isolate_test.dart
@@ -0,0 +1,33 @@
+// Copyright (c) 2023, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// SharedObjects=ffi_test_functions
+
+import 'dart:ffi';
+import 'dart:isolate';
+
+import 'package:expect/expect.dart';
+
+import 'dylib_utils.dart';
+
+final ffiTestFunctions = dlopenPlatformSpecific("ffi_test_functions");
+
+final initializeApi = ffiTestFunctions.lookupFunction<
+    IntPtr Function(Pointer<Void>),
+    int Function(Pointer<Void>)>("InitDartApiDL");
+final enterBarrier =
+    ffiTestFunctions.lookupFunction<Void Function(IntPtr), void Function(int)>(
+        "WaitUntilNThreadsEnterBarrier");
+
+main() async {
+  const threadBarrierCount = 30;
+
+  initializeApi(NativeApi.initializeApiDLData);
+
+  final all = <Future>[];
+  for (int i = 0; i < threadBarrierCount; ++i) {
+    all.add(Isolate.run(() => enterBarrier(threadBarrierCount)));
+  }
+  await Future.wait(all);
+}
diff --git a/tests/ffi_2/dl_api_exit_enter_isolate_test.dart b/tests/ffi_2/dl_api_exit_enter_isolate_test.dart
new file mode 100644
index 00000000000..03abbb3ed50
--- /dev/null
+++ b/tests/ffi_2/dl_api_exit_enter_isolate_test.dart
@@ -0,0 +1,35 @@
+// Copyright (c) 2023, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// @dart = 2.9
+
+// SharedObjects=ffi_test_functions
+
+import 'dart:ffi';
+import 'dart:isolate';
+
+import 'package:expect/expect.dart';
+
+import 'dylib_utils.dart';
+
+final ffiTestFunctions = dlopenPlatformSpecific("ffi_test_functions");
+
+final initializeApi = ffiTestFunctions.lookupFunction<
+    IntPtr Function(Pointer<Void>),
+    int Function(Pointer<Void>)>("InitDartApiDL");
+final enterBarrier =
+    ffiTestFunctions.lookupFunction<Void Function(IntPtr), void Function(int)>(
+        "WaitUntilNThreadsEnterBarrier");
+
+main() async {
+  const threadBarrierCount = 30;
+
+  initializeApi(NativeApi.initializeApiDLData);
+
+  final all = <Future>[];
+  for (int i = 0; i < threadBarrierCount; ++i) {
+    all.add(Isolate.run(() => enterBarrier(threadBarrierCount)));
+  }
+  await Future.wait(all);
+}