1 /* 2 * Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 #include <stdio.h> 24 #include <stdlib.h> 25 #include <string.h> 26 #include <jni.h> 27 #include <jvmti.h> 28 #include <aod.h> 29 #include <jvmti_aod.h> 30 31 extern "C" { 32 33 /* 34 * Expected agent work scenario: 35 * - from Agent_OnAttach function start auxiliary thread waiting on 'gcFinishMonitor' 36 * - receive GarbageCollectionStart event 37 * - receive GarbageCollectionFinish event, notify 'gcFinishMonitor' 38 * - notified auxiliary thread calls function 'nsk_aod_agentFinished' and agent completes work 39 * (such schema is used because of agent can't call nsk_aod_agentFinished from GarbageCollectionFinish handler, 40 * nsk_aod_agentFinished calls JNI functions and it is prohibited in GarbageCollectionFinish handler) 41 * 42 */ 43 44 static Options* options = NULL; 45 static const char* agentName; 46 47 static jvmtiEvent testEvents[] = {JVMTI_EVENT_GARBAGE_COLLECTION_START, JVMTI_EVENT_GARBAGE_COLLECTION_FINISH}; 48 static const int testEventsNumber = 2; 49 50 static jrawMonitorID gcFinishMonitor; 51 52 static volatile int gcStartEventReceived = 0; 53 54 static volatile int gcFinishEventReceived = 0; 55 56 static volatile int success = 1; 57 58 void JNICALL garbageCollectionStartHandler(jvmtiEnv *jvmti) { 59 NSK_DISPLAY1("%s: GC start event received\n", agentName); 60 61 gcStartEventReceived = 1; 62 } 63 64 void JNICALL garbageCollectionFinishHandler(jvmtiEnv *jvmti) { 65 int auxiliaryThreadNotified = 0; 66 67 NSK_DISPLAY1("%s: GC finish event received\n", agentName); 68 69 if (!gcStartEventReceived) { 70 NSK_COMPLAIN1("%s: GC start event wasn't received before GC finish event\n", agentName); 71 success = 0; 72 } 73 74 if (NSK_JVMTI_VERIFY(jvmti->RawMonitorEnter(gcFinishMonitor))) { 75 76 gcFinishEventReceived = 1; 77 78 if (NSK_JVMTI_VERIFY(jvmti->RawMonitorNotify(gcFinishMonitor))) { 79 auxiliaryThreadNotified = 1; 80 } 81 82 if (!NSK_JVMTI_VERIFY(jvmti->RawMonitorExit(gcFinishMonitor))) { 83 success = 0; 84 } 85 } else { 86 success = 0; 87 } 88 89 if (!auxiliaryThreadNotified) { 90 NSK_COMPLAIN1("%s: Error happenned during auxiliary thread notification, test may hang\n", agentName); 91 } 92 } 93 94 void JNICALL auxiliaryThreadFunction(jvmtiEnv* jvmti, JNIEnv* jni, void* arg) { 95 NSK_DISPLAY1("%s: auxiliary thread is running\n", agentName); 96 97 if (NSK_JVMTI_VERIFY(jvmti->RawMonitorEnter(gcFinishMonitor))) { 98 99 if (!gcFinishEventReceived) { 100 if (!NSK_JVMTI_VERIFY(jvmti->RawMonitorWait(gcFinishMonitor, 0))) { 101 success = 0; 102 } 103 } 104 105 if (!NSK_JVMTI_VERIFY(jvmti->RawMonitorExit(gcFinishMonitor))) { 106 success = 0; 107 } 108 } else { 109 success = 0; 110 } 111 112 nsk_jvmti_aod_disableEventsAndFinish(agentName, testEvents, testEventsNumber, success, jvmti, jni); 113 } 114 115 int startAuxiliaryThread(jvmtiEnv* jvmti, JNIEnv* jni) { 116 jthread thread; 117 118 if (!NSK_VERIFY((thread = nsk_jvmti_aod_createThread(jni)) != NULL)) 119 return NSK_FALSE; 120 121 if (!NSK_JVMTI_VERIFY(jvmti->RunAgentThread(thread, auxiliaryThreadFunction, NULL, JVMTI_THREAD_NORM_PRIORITY))) { 122 return NSK_FALSE; 123 } 124 125 NSK_DISPLAY1("%s: auxiliary thread was started\n", agentName); 126 127 return NSK_TRUE; 128 } 129 130 #ifdef STATIC_BUILD 131 JNIEXPORT jint JNI_OnLoad_attach020Agent00(JavaVM *jvm, char *options, void *reserved) { 132 return JNI_VERSION_1_8; 133 } 134 #endif 135 136 JNIEXPORT jint JNICALL 137 #ifdef STATIC_BUILD 138 Agent_OnAttach_attach020Agent00(JavaVM *vm, char *optionsString, void *reserved) 139 #else 140 Agent_OnAttach(JavaVM *vm, char *optionsString, void *reserved) 141 #endif 142 { 143 jvmtiEnv* jvmti; 144 jvmtiEventCallbacks eventCallbacks; 145 jvmtiCapabilities caps; 146 JNIEnv* jni; 147 148 if (!NSK_VERIFY((options = (Options*) nsk_aod_createOptions(optionsString)) != NULL)) 149 return JNI_ERR; 150 151 agentName = nsk_aod_getOptionValue(options, NSK_AOD_AGENT_NAME_OPTION); 152 153 if ((jni = (JNIEnv*) nsk_aod_createJNIEnv(vm)) == NULL) 154 return JNI_ERR; 155 156 if (!NSK_VERIFY((jvmti = nsk_jvmti_createJVMTIEnv(vm, reserved)) != NULL)) 157 return JNI_ERR; 158 159 if (!NSK_JVMTI_VERIFY(jvmti->CreateRawMonitor("GCFinishMonitor", &gcFinishMonitor))) { 160 return JNI_ERR; 161 } 162 163 if (!NSK_VERIFY(startAuxiliaryThread(jvmti, jni))) 164 return JNI_ERR; 165 166 memset(&caps, 0, sizeof(caps)); 167 caps.can_generate_garbage_collection_events = 1; 168 if (!NSK_JVMTI_VERIFY(jvmti->AddCapabilities(&caps))) { 169 return JNI_ERR; 170 } 171 172 memset(&eventCallbacks,0, sizeof(eventCallbacks)); 173 eventCallbacks.GarbageCollectionStart = garbageCollectionStartHandler; 174 eventCallbacks.GarbageCollectionFinish = garbageCollectionFinishHandler; 175 if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&eventCallbacks, sizeof(eventCallbacks)))) { 176 return JNI_ERR; 177 } 178 179 if (!(nsk_jvmti_aod_enableEvents(jvmti, testEvents, testEventsNumber))) { 180 return JNI_ERR; 181 } 182 183 NSK_DISPLAY1("%s: initialization was done\n", agentName); 184 185 if (!NSK_VERIFY(nsk_aod_agentLoaded(jni, agentName))) 186 return JNI_ERR; 187 188 return JNI_OK; 189 } 190 }