1 /*
2  * Copyright (C) 2018 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #include <jni.h>
18 #include <nativehelper/scoped_local_ref.h>
19 #include <pthread.h>
20 
21 #include <android-base/logging.h>
22 
23 namespace art {
24 
25 static JavaVM* vm = nullptr;
26 
27 static void* Runner(void* arg) {
28   CHECK(vm != nullptr);
29 
30   jobject thread_group = reinterpret_cast<jobject>(arg);
31   JNIEnv* env = nullptr;
32   JavaVMAttachArgs args = { JNI_VERSION_1_6, __FUNCTION__, thread_group };
33   int attach_result = vm->AttachCurrentThread(&env, &args);
34   CHECK_EQ(attach_result, 0);
35 
36   {
37     ScopedLocalRef<jclass> klass(env, env->FindClass("Main"));
38     CHECK(klass != nullptr);
39 
40     jmethodID id = env->GetStaticMethodID(klass.get(), "runFromNative", "()V");
41     CHECK(id != nullptr);
42 
43     env->CallStaticVoidMethod(klass.get(), id);
44   }
45 
46   int detach_result = vm->DetachCurrentThread();
47   CHECK_EQ(detach_result, 0);
48   return nullptr;
49 }
50 
51 extern "C" JNIEXPORT void JNICALL Java_Main_testNativeThread(
52     JNIEnv* env, jclass, jobject thread_group) {
53   CHECK_EQ(env->GetJavaVM(&vm), 0);
54   jobject global_thread_group = env->NewGlobalRef(thread_group);
55 
56   pthread_t pthread;
57   int pthread_create_result = pthread_create(&pthread, nullptr, Runner, global_thread_group);
58   CHECK_EQ(pthread_create_result, 0);
59   int pthread_join_result = pthread_join(pthread, nullptr);
60   CHECK_EQ(pthread_join_result, 0);
61 
62   env->DeleteGlobalRef(global_thread_group);
63 }
64 
65 }  // namespace art
66