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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <memory>
#include <string>
#include <pthread.h>
#include <sys/prctl.h>
#include <jni.h>
#include <nativehelper/JNIHelp.h>
static JavaVM* javaVm = nullptr;
static void* TestThreadNaming(void* arg) {
const bool attach_with_name = (reinterpret_cast<uint64_t>(arg) == 1);
const std::string native_thread_name = "foozball";
pthread_setname_np(pthread_self(), native_thread_name.c_str());
JNIEnv* env;
JavaVMAttachArgs args;
args.version = JNI_VERSION_1_6;
args.group = nullptr;
if (attach_with_name) {
args.name = native_thread_name.c_str();
} else {
args.name = nullptr;
}
if (javaVm->AttachCurrentThread(&env, &args) != JNI_OK) {
return new std::string("Attach failed");
}
std::string* exception_message = nullptr;
std::unique_ptr<char[]> thread_name(new char[32]);
if (prctl(PR_GET_NAME, reinterpret_cast<unsigned long>(thread_name.get()), 0L, 0L, 0L) == 0) {
// If a thread is attached with a name, the native thread name must be set to
// the supplied name. In this test, the name we attach with == the
// native_thread_name.
if (attach_with_name && (thread_name.get() != native_thread_name)) {
exception_message = new std::string("expected_thread_name != thread_name: ");
exception_message->append("expected :");
exception_message->append(native_thread_name);
exception_message->append(" was :");
exception_message->append(thread_name.get());
}
// On the other hand, if the thread isn't attached with a name - the
// runtime assigns a name according to the usual thread naming scheme.
if (!attach_with_name && strncmp(thread_name.get(), "Thread", 6)) {
exception_message = new std::string("unexpected thread name : ");
exception_message->append(thread_name.get());
}
} else {
exception_message = new std::string("prctl(PR_GET_NAME) failed :");
exception_message->append(strerror(errno));
}
if (javaVm->DetachCurrentThread() != JNI_OK) {
if (exception_message == nullptr) {
exception_message = new std::string("Detach failed");
}
}
return exception_message;
}
extern "C" jstring Java_libcore_java_lang_ThreadTest_nativeTestNativeThreadNames(
JNIEnv* env, jobject /* object */) {
std::string result;
// TEST 1: Test that a thread attaching with a specified name (in the
// JavaVMAttachArgs) does not have its name changed.
pthread_t attacher;
if (pthread_create(&attacher, nullptr, TestThreadNaming,
reinterpret_cast<void*>(static_cast<uint64_t>(0))) != 0) {
jniThrowException(env, "java/lang/IllegalStateException", "Attach failed");
}
std::string* result_test1;
if (pthread_join(attacher, reinterpret_cast<void**>(&result_test1)) != 0) {
jniThrowException(env, "java/lang/IllegalStateException", "Join failed");
}
if (result_test1 != nullptr) {
result.append("test 1: ");
result.append(*result_test1);
}
// TEST 2: Test that a thread attaching without a specified name (in the
// JavaVMAttachArgs) has its native name changed as per the standard naming
// convention.
pthread_t attacher2;
if (pthread_create(&attacher2, nullptr, TestThreadNaming,
reinterpret_cast<void*>(static_cast<uint64_t>(1))) != 0) {
jniThrowException(env, "java/lang/IllegalStateException", "Attach failed");
}
std::string* result_test2;
if (pthread_join(attacher2, reinterpret_cast<void**>(&result_test2)) != 0) {
jniThrowException(env, "java/lang/IllegalStateException", "Join failed");
}
if (result_test2 != nullptr) {
result.append("test 2: ");
result.append(*result_test2);
}
// Return test results.
jstring resultJString = nullptr;
if (result.size() > 0) {
resultJString = env->NewStringUTF(result.c_str());
}
delete result_test1;
delete result_test2;
return resultJString;
}
extern "C" int JNI_OnLoad(JavaVM* vm, void*) {
javaVm = vm;
return JNI_VERSION_1_6;
}
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