105 lines
3.5 KiB
C++
105 lines
3.5 KiB
C++
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/*
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* Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include <cstring>
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#include <jvmti.h>
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#include <atomic>
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#include "jvmti_common.h"
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extern "C" {
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static jvmtiEnv *jvmti = nullptr;
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static std::atomic<int> thread_end_cnt(0);
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static std::atomic<int> thread_unmount_cnt(0);
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static std::atomic<int> thread_mount_cnt(0);
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void JNICALL VirtualThreadEnd(jvmtiEnv *jvmti, JNIEnv* jni, jthread vthread) {
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thread_end_cnt++;
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}
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void JNICALL VirtualThreadMount(jvmtiEnv* jvmti, ...) {
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thread_mount_cnt++;
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}
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void JNICALL VirtualThreadUnmount(jvmtiEnv* jvmti, ...) {
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thread_unmount_cnt++;
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}
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JNIEXPORT jint JNICALL
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Java_VThreadEventTest_threadEndCount(JNIEnv* jni, jclass clazz) {
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return thread_end_cnt;
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}
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JNIEXPORT jint JNICALL
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Java_VThreadEventTest_threadMountCount(JNIEnv* jni, jclass clazz) {
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return thread_mount_cnt;
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}
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JNIEXPORT jint JNICALL
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Java_VThreadEventTest_threadUnmountCount(JNIEnv* jni, jclass clazz) {
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return thread_unmount_cnt;
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}
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JNIEXPORT jint JNICALL
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Agent_OnAttach(JavaVM *vm, char *options, void *reserved) {
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jvmtiEventCallbacks callbacks;
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jvmtiCapabilities caps;
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jvmtiError err;
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LOG("Agent_OnAttach started\n");
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if (vm->GetEnv(reinterpret_cast<void **>(&jvmti), JVMTI_VERSION) != JNI_OK || !jvmti) {
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LOG("Could not initialize JVMTI env\n");
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return JNI_ERR;
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}
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memset(&caps, 0, sizeof(caps));
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caps.can_support_virtual_threads = 1;
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check_jvmti_error(jvmti->AddCapabilities(&caps), "AddCapabilities");
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memset(&callbacks, 0, sizeof(callbacks));
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callbacks.VirtualThreadEnd = &VirtualThreadEnd;
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err = jvmti->SetEventCallbacks(&callbacks, (jint)sizeof(callbacks));
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check_jvmti_error(err, "SetEventCallbacks");
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err = set_ext_event_callback(jvmti, "VirtualThreadMount", VirtualThreadMount);
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check_jvmti_error(err, "SetExtEventCallback for VirtualThreadMount");
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err = set_ext_event_callback(jvmti, "VirtualThreadUnmount", VirtualThreadUnmount);
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check_jvmti_error(err, "SetExtEventCallback for VirtualThreadUnmount");
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err = jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_VIRTUAL_THREAD_END, nullptr);
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check_jvmti_error(err, "SetEventNotificationMode for VirtualThreadEnd");
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err = jvmti->SetEventNotificationMode(JVMTI_ENABLE, EXT_EVENT_VIRTUAL_THREAD_MOUNT, nullptr);
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check_jvmti_error(err, "SetEventNotificationMode for VirtualThreadMount");
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err = jvmti->SetEventNotificationMode(JVMTI_ENABLE, EXT_EVENT_VIRTUAL_THREAD_UNMOUNT, nullptr);
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check_jvmti_error(err, "SetEventNotificationMode for VirtualThreadUnmount");
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LOG("vthread events enabled\n");
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return JVMTI_ERROR_NONE;
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}
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} // extern "C"
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