| /* |
| * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| #include <stdio.h> |
| #include <string.h> |
| #include "jvmti.h" |
| #include "jni.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| #ifndef JNI_ENV_ARG |
| |
| #ifdef __cplusplus |
| #define JNI_ENV_ARG(x, y) y |
| #define JNI_ENV_PTR(x) x |
| #else |
| #define JNI_ENV_ARG(x,y) x, y |
| #define JNI_ENV_PTR(x) (*x) |
| #endif |
| |
| #endif |
| |
| #define PASSED 0 |
| #define FAILED 2 |
| |
| #define TEST_CLASS "GetOwnedMonitorInfoTest" |
| |
| static volatile jboolean event_has_posted = JNI_FALSE; |
| static volatile jint status = PASSED; |
| static volatile jclass testClass = NULL; |
| |
| static jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved); |
| |
| static void ShowErrorMessage(jvmtiEnv *jvmti, jvmtiError errCode, const char *message) { |
| char *errMsg; |
| jvmtiError result; |
| |
| result = (*jvmti)->GetErrorName(jvmti, errCode, &errMsg); |
| if (result == JVMTI_ERROR_NONE) { |
| fprintf(stderr, "%s: %s (%d)\n", message, errMsg, errCode); |
| (*jvmti)->Deallocate(jvmti, (unsigned char *)errMsg); |
| } else { |
| fprintf(stderr, "%s (%d)\n", message, errCode); |
| } |
| } |
| |
| static jboolean CheckLockObject(JNIEnv *env, jobject monitor) { |
| if (testClass == NULL) { |
| // JNI_OnLoad has not been called yet, so can't possibly be an instance of TEST_CLASS. |
| return JNI_FALSE; |
| } |
| return (*env)->IsInstanceOf(env, monitor, testClass); |
| } |
| |
| JNIEXPORT void JNICALL |
| MonitorContendedEnter(jvmtiEnv *jvmti, JNIEnv *env, jthread thread, jobject monitor) { |
| jvmtiError err; |
| jvmtiThreadInfo threadInfo; |
| jint monitorCount; |
| jobject *ownedMonitors; |
| |
| if (CheckLockObject(env, monitor) == JNI_FALSE) { |
| return; |
| } |
| |
| err = (*jvmti)->GetThreadInfo(jvmti, thread, &threadInfo); |
| if (err != JVMTI_ERROR_NONE) { |
| ShowErrorMessage(jvmti, err, |
| "MonitorContendedEnter: error in JVMTI GetThreadInfo"); |
| status = FAILED; |
| event_has_posted = JNI_TRUE; |
| return; |
| } |
| err = (*jvmti)->GetOwnedMonitorInfo(jvmti, thread, &monitorCount, &ownedMonitors); |
| if (err != JVMTI_ERROR_NONE) { |
| ShowErrorMessage(jvmti, err, |
| "MonitorContendedEnter: error in JVMTI GetOwnedMonitorInfo"); |
| status = FAILED; |
| event_has_posted = JNI_TRUE; |
| return; |
| } |
| |
| printf("MonitorContendedEnter: %s owns %d monitor(s)\n", |
| threadInfo.name, monitorCount); |
| |
| (*jvmti)->Deallocate(jvmti, (unsigned char *)ownedMonitors); |
| (*jvmti)->Deallocate(jvmti, (unsigned char *)threadInfo.name); |
| |
| if (monitorCount != 0) { |
| fprintf(stderr, "MonitorContendedEnter: FAIL: monitorCount should be zero.\n"); |
| status = FAILED; |
| } |
| |
| event_has_posted = JNI_TRUE; |
| } |
| |
| JNIEXPORT void JNICALL |
| MonitorContendedEntered(jvmtiEnv *jvmti, JNIEnv *env, jthread thread, jobject monitor) { |
| jvmtiError err; |
| jvmtiThreadInfo threadInfo; |
| jint monitorCount; |
| jobject *ownedMonitors; |
| |
| if (CheckLockObject(env, monitor) == JNI_FALSE) { |
| return; |
| } |
| |
| err = (*jvmti)->GetThreadInfo(jvmti, thread, &threadInfo); |
| if (err != JVMTI_ERROR_NONE) { |
| ShowErrorMessage(jvmti, err, |
| "MonitorContendedEntered: error in JVMTI GetThreadInfo"); |
| status = FAILED; |
| return; |
| } |
| err = (*jvmti)->GetOwnedMonitorInfo(jvmti, thread, &monitorCount, &ownedMonitors); |
| if (err != JVMTI_ERROR_NONE) { |
| ShowErrorMessage(jvmti, err, |
| "MonitorContendedEntered: error in JVMTI GetOwnedMonitorInfo"); |
| status = FAILED; |
| return; |
| } |
| |
| printf("MonitorContendedEntered: %s owns %d monitor(s)\n", |
| threadInfo.name, monitorCount); |
| |
| (*jvmti)->Deallocate(jvmti, (unsigned char *)ownedMonitors); |
| (*jvmti)->Deallocate(jvmti, (unsigned char *)threadInfo.name); |
| |
| if (monitorCount != 1) { |
| fprintf(stderr, "MonitorContendedEnter: FAIL: monitorCount should be one.\n"); |
| status = FAILED; |
| } |
| } |
| |
| JNIEXPORT jint JNICALL |
| Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| |
| JNIEXPORT jint JNICALL |
| Agent_OnAttach(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| |
| JNIEXPORT jint JNICALL |
| JNI_OnLoad(JavaVM *jvm, void *reserved) { |
| jint res; |
| JNIEnv *env; |
| |
| res = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (void **) &env), |
| JNI_VERSION_9); |
| if (res != JNI_OK || env == NULL) { |
| fprintf(stderr, "Error: GetEnv call failed(%d)!\n", res); |
| return JNI_ERR; |
| } |
| |
| testClass = (*env)->FindClass(env, TEST_CLASS); |
| if (testClass != NULL) { |
| testClass = (*env)->NewGlobalRef(env, testClass); |
| } |
| if (testClass == NULL) { |
| fprintf(stderr, "Error: Could not load class %s!\n", TEST_CLASS); |
| return JNI_ERR; |
| } |
| |
| return JNI_VERSION_9; |
| } |
| |
| static |
| jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) { |
| jint res; |
| jvmtiError err; |
| jvmtiEnv *jvmti; |
| jvmtiCapabilities caps; |
| jvmtiEventCallbacks callbacks; |
| |
| printf("Agent_OnLoad started\n"); |
| |
| res = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (void **) &jvmti), |
| JVMTI_VERSION_9); |
| if (res != JNI_OK || jvmti == NULL) { |
| fprintf(stderr, "Error: wrong result of a valid call to GetEnv!\n"); |
| return JNI_ERR; |
| } |
| |
| err = (*jvmti)->GetPotentialCapabilities(jvmti, &caps); |
| if (err != JVMTI_ERROR_NONE) { |
| ShowErrorMessage(jvmti, err, |
| "Agent_OnLoad: error in JVMTI GetPotentialCapabilities"); |
| return JNI_ERR; |
| } |
| |
| err = (*jvmti)->AddCapabilities(jvmti, &caps); |
| if (err != JVMTI_ERROR_NONE) { |
| ShowErrorMessage(jvmti, err, |
| "Agent_OnLoad: error in JVMTI AddCapabilities"); |
| return JNI_ERR; |
| } |
| |
| err = (*jvmti)->GetCapabilities(jvmti, &caps); |
| if (err != JVMTI_ERROR_NONE) { |
| ShowErrorMessage(jvmti, err, |
| "Agent_OnLoad: error in JVMTI GetCapabilities"); |
| return JNI_ERR; |
| } |
| |
| if (!caps.can_generate_monitor_events) { |
| fprintf(stderr, "Warning: Monitor events are not implemented\n"); |
| return JNI_ERR; |
| } |
| if (!caps.can_get_owned_monitor_info) { |
| fprintf(stderr, "Warning: GetOwnedMonitorInfo is not implemented\n"); |
| return JNI_ERR; |
| } |
| |
| memset(&callbacks, 0, sizeof(callbacks)); |
| callbacks.MonitorContendedEnter = &MonitorContendedEnter; |
| callbacks.MonitorContendedEntered = &MonitorContendedEntered; |
| |
| err = (*jvmti)->SetEventCallbacks(jvmti, &callbacks, sizeof(jvmtiEventCallbacks)); |
| if (err != JVMTI_ERROR_NONE) { |
| ShowErrorMessage(jvmti, err, |
| "Agent_OnLoad: error in JVMTI SetEventCallbacks"); |
| return JNI_ERR; |
| } |
| |
| err = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE, |
| JVMTI_EVENT_MONITOR_CONTENDED_ENTER, NULL); |
| if (err != JVMTI_ERROR_NONE) { |
| ShowErrorMessage(jvmti, err, |
| "Agent_OnLoad: error in JVMTI SetEventNotificationMode #1"); |
| return JNI_ERR; |
| } |
| err = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE, |
| JVMTI_EVENT_MONITOR_CONTENDED_ENTERED, NULL); |
| if (err != JVMTI_ERROR_NONE) { |
| ShowErrorMessage(jvmti, err, |
| "Agent_OnLoad: error in JVMTI SetEventNotificationMode #2"); |
| return JNI_ERR; |
| } |
| printf("Agent_OnLoad finished\n"); |
| return JNI_OK; |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_GetOwnedMonitorInfoTest_check(JNIEnv *env, jclass cls) { |
| return status; |
| } |
| |
| JNIEXPORT jboolean JNICALL |
| Java_GetOwnedMonitorInfoTest_hasEventPosted(JNIEnv *env, jclass cls) { |
| return event_has_posted; |
| } |
| |
| #ifdef __cplusplus |
| } |
| #endif |
