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/*
* Copyright (C) 2017 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 <inttypes.h>
#include <pthread.h>
#include <sched.h>
#include "android-base/logging.h"
#include "android-base/macros.h"
#include "jni.h"
#include "jvmti.h"
#include "scoped_local_ref.h"
// Test infrastructure
#include "jvmti_helper.h"
#include "test_env.h"
namespace art {
namespace Test930AgentThread {
struct AgentData {
AgentData() : main_thread(nullptr),
jvmti_env(nullptr),
priority(0) {
}
jthread main_thread;
jvmtiEnv* jvmti_env;
pthread_barrier_t b;
jint priority;
};
static void AgentMain(jvmtiEnv* jenv, JNIEnv* env, void* arg) {
AgentData* data = reinterpret_cast<AgentData*>(arg);
// Check some basics.
// This thread is not the main thread.
jthread this_thread;
jvmtiError this_thread_result = jenv->GetCurrentThread(&this_thread);
CheckJvmtiError(jenv, this_thread_result);
CHECK(!env->IsSameObject(this_thread, data->main_thread));
// The thread is a daemon.
jvmtiThreadInfo info;
jvmtiError info_result = jenv->GetThreadInfo(this_thread, &info);
CheckJvmtiError(jenv, info_result);
CHECK(info.is_daemon);
CheckJvmtiError(jenv, jenv->Deallocate(reinterpret_cast<unsigned char*>(info.name)));
if (info.thread_group != nullptr) {
env->DeleteLocalRef(info.thread_group);
}
if (info.context_class_loader != nullptr) {
env->DeleteLocalRef(info.context_class_loader);
}
// The thread has the requested priority.
// TODO: Our thread priorities do not work on the host.
// CHECK_EQ(info.priority, data->priority);
// Check further parts of the thread:
jint thread_count;
jthread* threads;
jvmtiError threads_result = jenv->GetAllThreads(&thread_count, &threads);
CheckJvmtiError(jenv, threads_result);
bool found = false;
for (jint i = 0; i != thread_count; ++i) {
if (env->IsSameObject(threads[i], this_thread)) {
found = true;
break;
}
}
CHECK(found);
// Done, let the main thread progress.
int wait_result = pthread_barrier_wait(&data->b);
CHECK(wait_result == PTHREAD_BARRIER_SERIAL_THREAD || wait_result == 0);
}
extern "C" JNIEXPORT void JNICALL Java_art_Test931_testAgentThread(
JNIEnv* env, jclass Main_klass ATTRIBUTE_UNUSED) {
// Create a Thread object.
ScopedLocalRef<jobject> thread_name(env, env->NewStringUTF("Agent Thread"));
if (thread_name.get() == nullptr) {
return;
}
ScopedLocalRef<jclass> thread_klass(env, env->FindClass("java/lang/Thread"));
if (thread_klass.get() == nullptr) {
return;
}
ScopedLocalRef<jobject> thread(env, env->AllocObject(thread_klass.get()));
if (thread.get() == nullptr) {
return;
}
// Get a ThreadGroup from the current thread. We need a non-null one as we're gonna call a
// runtime-only constructor (so we can set priority and daemon state).
jvmtiThreadInfo cur_thread_info;
jvmtiError info_result = jvmti_env->GetThreadInfo(nullptr, &cur_thread_info);
if (JvmtiErrorToException(env, jvmti_env, info_result)) {
return;
}
CheckJvmtiError(jvmti_env,
jvmti_env->Deallocate(reinterpret_cast<unsigned char*>(cur_thread_info.name)));
ScopedLocalRef<jobject> thread_group(env, cur_thread_info.thread_group);
if (cur_thread_info.context_class_loader != nullptr) {
env->DeleteLocalRef(cur_thread_info.context_class_loader);
}
jmethodID initID = env->GetMethodID(
thread_klass.get(), "<init>", "(Ljava/lang/ThreadGroup;Ljava/lang/String;)V");
if (initID == nullptr) {
return;
}
env->CallNonvirtualVoidMethod(
thread.get(), thread_klass.get(), initID, thread_group.get(), thread_name.get());
if (env->ExceptionCheck()) {
return;
}
jthread main_thread;
jvmtiError main_thread_result = jvmti_env->GetCurrentThread(&main_thread);
if (JvmtiErrorToException(env, jvmti_env, main_thread_result)) {
return;
}
AgentData data;
data.main_thread = env->NewGlobalRef(main_thread);
data.jvmti_env = jvmti_env;
data.priority = JVMTI_THREAD_MIN_PRIORITY;
CHECK_EQ(0, pthread_barrier_init(&data.b, nullptr, 2));
jvmtiError result = jvmti_env->RunAgentThread(thread.get(), AgentMain, &data, data.priority);
if (JvmtiErrorToException(env, jvmti_env, result)) {
return;
}
int wait_result = pthread_barrier_wait(&data.b);
CHECK(wait_result == PTHREAD_BARRIER_SERIAL_THREAD || wait_result == 0);
// Scheduling may mean that the agent thread is put to sleep. Wait until it's dead in an effort
// to not unload the plugin and crash.
for (;;) {
sleep(1);
jint thread_state;
jvmtiError state_result = jvmti_env->GetThreadState(thread.get(), &thread_state);
if (JvmtiErrorToException(env, jvmti_env, state_result)) {
return;
}
if (thread_state == 0 || // Was never alive.
(thread_state & JVMTI_THREAD_STATE_TERMINATED) != 0) { // Was alive and died.
break;
}
}
// Yield and sleep a bit more, to give the plugin time to tear down the native thread structure.
sched_yield();
sleep(1);
env->DeleteGlobalRef(data.main_thread);
pthread_barrier_destroy(&data.b);
}
} // namespace Test930AgentThread
} // namespace art
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