79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <dlfcn.h>
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#include <iostream>
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#include "base/casts.h"
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#include "base/macros.h"
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#include "jni/java_vm_ext.h"
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#include "jni/jni_env_ext.h"
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#include "thread-current-inl.h"
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namespace art {
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namespace {
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static volatile std::atomic<bool> vm_was_shutdown(false);
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static const int kThreadCount = 4;
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static std::atomic<int> barrier_count(kThreadCount + 1);
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static void JniThreadBarrierWait() {
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barrier_count--;
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while (barrier_count.load() != 0) {
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usleep(1000);
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}
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}
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extern "C" JNIEXPORT void JNICALL Java_Main_waitAndCallIntoJniEnv(JNIEnv* env, jclass) {
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// Wait for all threads to enter JNI together.
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JniThreadBarrierWait();
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// Wait until the runtime is shutdown.
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while (!vm_was_shutdown.load()) {
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usleep(1000);
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}
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std::cout << "About to call exception check\n";
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env->ExceptionCheck();
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LOG(ERROR) << "Should not be reached!";
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}
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// NO_RETURN does not work with extern "C" for target builds.
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extern "C" JNIEXPORT void JNICALL Java_Main_destroyJavaVMAndExit(JNIEnv* env, jclass) {
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// Wait for all threads to enter JNI together.
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JniThreadBarrierWait();
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// Fake up the managed stack so we can detach.
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Thread* const self = Thread::Current();
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self->SetTopOfStack(nullptr);
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self->SetTopOfShadowStack(nullptr);
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JavaVM* vm = down_cast<JNIEnvExt*>(env)->GetVm();
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vm->DetachCurrentThread();
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// Open ourself again to make sure the native library does not get unloaded from
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// underneath us due to DestroyJavaVM. b/28406866
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void* handle = dlopen(kIsDebugBuild ? "libarttestd.so" : "libarttest.so", RTLD_NOW);
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CHECK(handle != nullptr);
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vm->DestroyJavaVM();
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vm_was_shutdown.store(true);
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// Give threads some time to get stuck in ExceptionCheck.
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usleep(1000000);
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if (env != nullptr) {
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// Use env != nullptr to trick noreturn.
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exit(0);
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}
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}
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} // namespace
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} // namespace art
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