89 lines
2.6 KiB
C++
89 lines
2.6 KiB
C++
/*
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* Copyright (c) 2001, 2024, 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 <string.h>
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#include "jvmti.h"
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extern "C" {
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static jvmtiEnv* jvmti = nullptr;
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#define LOG(...) \
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do { \
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printf(__VA_ARGS__); \
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printf("\n"); \
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fflush(stdout); \
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} while (0)
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JNIEXPORT jint JNICALL
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Java_GetLockOwnerName_wait4ContendedEnter(JNIEnv *jni, jclass cls, jthread thr) {
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jvmtiError err;
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jint thread_state;
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do {
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err = jvmti->GetThreadState(thr, &thread_state);
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if (err != JVMTI_ERROR_NONE) {
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return err;
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}
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if ((thread_state & JVMTI_THREAD_STATE_BLOCKED_ON_MONITOR_ENTER) != 0) {
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// For this test, we need the contended monitor reference and
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// that is saved right after the thread state is updated so we
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// only return from this function when we have both.
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jobject monitor_ptr;
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err = jvmti->GetCurrentContendedMonitor(thr, &monitor_ptr);
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if (err != JVMTI_ERROR_NONE) {
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return err;
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}
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if (monitor_ptr != nullptr) {
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break;
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}
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}
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} while (true);
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return err;
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}
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/** Agent library initialization. */
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JNIEXPORT jint JNICALL
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Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {
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LOG("\nAgent_OnLoad started");
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// create JVMTI environment
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if (jvm->GetEnv((void **) (&jvmti), JVMTI_VERSION) != JNI_OK) {
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return JNI_ERR;
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}
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// add capabilities needed for this test
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jvmtiCapabilities needCaps;
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memset(&needCaps, 0, sizeof(needCaps));
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needCaps.can_get_current_contended_monitor = 1;
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jvmtiError err = jvmti->AddCapabilities(&needCaps);
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if (err != JVMTI_ERROR_NONE) {
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return JNI_ERR;
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}
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LOG("Agent_OnLoad finished\n");
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return JNI_OK;
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}
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}
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