ART: Add test for DetachCurrentThread monitor behavior
DetachCurrentThread is supposed to release any locks acquired through
JNI. The functionality has been there, add a test.
Bug: 20453586
Change-Id: I537f38e3e4003fe0846d037dbb235f2ea6ff8716
diff --git a/runtime/jni_internal_test.cc b/runtime/jni_internal_test.cc
index 649df5f..d1687d7 100644
--- a/runtime/jni_internal_test.cc
+++ b/runtime/jni_internal_test.cc
@@ -2210,4 +2210,55 @@
check_jni_abort_catcher.Check("Still holding a locked object on JNI end");
}
+static bool IsLocked(JNIEnv* env, jobject jobj) {
+ ScopedObjectAccess soa(env);
+ LockWord lock_word = soa.Decode<mirror::Object*>(jobj)->GetLockWord(true);
+ switch (lock_word.GetState()) {
+ case LockWord::kHashCode:
+ case LockWord::kUnlocked:
+ return false;
+ case LockWord::kThinLocked:
+ return true;
+ case LockWord::kFatLocked:
+ return lock_word.FatLockMonitor()->IsLocked();
+ default: {
+ LOG(FATAL) << "Invalid monitor state " << lock_word.GetState();
+ UNREACHABLE();
+ }
+ }
+}
+
+TEST_F(JniInternalTest, DetachThreadUnlockJNIMonitors) {
+ // We need to lock an object, detach, reattach, and check the locks.
+ //
+ // As re-attaching will create a different thread, we need to use a global
+ // ref to keep the object around.
+
+ // Create an object to torture.
+ jobject global_ref;
+ {
+ jclass object_class = env_->FindClass("java/lang/Object");
+ ASSERT_NE(object_class, nullptr);
+ jobject object = env_->AllocObject(object_class);
+ ASSERT_NE(object, nullptr);
+ global_ref = env_->NewGlobalRef(object);
+ }
+
+ // Lock it.
+ env_->MonitorEnter(global_ref);
+ ASSERT_TRUE(IsLocked(env_, global_ref));
+
+ // Detach and re-attach.
+ jint detach_result = vm_->DetachCurrentThread();
+ ASSERT_EQ(detach_result, JNI_OK);
+ jint attach_result = vm_->AttachCurrentThread(&env_, nullptr);
+ ASSERT_EQ(attach_result, JNI_OK);
+
+ // Look at the global ref, check whether it's still locked.
+ ASSERT_FALSE(IsLocked(env_, global_ref));
+
+ // Delete the global ref.
+ env_->DeleteGlobalRef(global_ref);
+}
+
} // namespace art