/*

 * Copyright (c) 2007, 2018, 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 <stdlib.h>

#include <string.h>

#include <jni.h>

#include <jvmti.h>

#include <aod.h>

#include <jvmti_aod.h>

extern "C" {

/*

 * Expected agent work scenario:

 * - from Agent_OnAttach function start auxiliary thread waiting on 'gcFinishMonitor'

 * - receive GarbageCollectionStart event

 * - receive GarbageCollectionFinish event, notify 'gcFinishMonitor'

 * - notified auxiliary thread calls function 'nsk_aod_agentFinished' and agent completes work

 * (such schema is used because of agent can't call nsk_aod_agentFinished from GarbageCollectionFinish handler,

 * nsk_aod_agentFinished calls JNI functions and it is prohibited in GarbageCollectionFinish handler)

 *

 */

static Options* options = NULL;

static const char* agentName;

static jvmtiEvent testEvents[] = {JVMTI_EVENT_GARBAGE_COLLECTION_START, JVMTI_EVENT_GARBAGE_COLLECTION_FINISH};

static const int testEventsNumber = 2;

static jrawMonitorID gcFinishMonitor;

static volatile int gcStartEventReceived = 0;

static volatile int gcFinishEventReceived = 0;

static volatile int success = 1;

void JNICALL garbageCollectionStartHandler(jvmtiEnv *jvmti) {

    NSK_DISPLAY1("%s: GC start event received\n", agentName);

    gcStartEventReceived = 1;

}

void JNICALL garbageCollectionFinishHandler(jvmtiEnv *jvmti) {

    int auxiliaryThreadNotified = 0;

    NSK_DISPLAY1("%s: GC finish event received\n", agentName);

    if (!gcStartEventReceived) {

        NSK_COMPLAIN1("%s: GC start event wasn't received before GC finish event\n", agentName);

        success = 0;

    }

    if (NSK_JVMTI_VERIFY(jvmti->RawMonitorEnter(gcFinishMonitor))) {

        gcFinishEventReceived = 1;

        if (NSK_JVMTI_VERIFY(jvmti->RawMonitorNotify(gcFinishMonitor))) {

            auxiliaryThreadNotified = 1;

        }

        if (!NSK_JVMTI_VERIFY(jvmti->RawMonitorExit(gcFinishMonitor))) {

            success = 0;

        }

    } else {

        success = 0;

    }

    if (!auxiliaryThreadNotified) {

        NSK_COMPLAIN1("%s: Error happenned during auxiliary thread notification, test may hang\n", agentName);

    }

}

void JNICALL auxiliaryThreadFunction(jvmtiEnv* jvmti, JNIEnv* jni, void* arg) {

    NSK_DISPLAY1("%s: auxiliary thread is running\n", agentName);

    if (NSK_JVMTI_VERIFY(jvmti->RawMonitorEnter(gcFinishMonitor))) {

        if (!gcFinishEventReceived) {

            if (!NSK_JVMTI_VERIFY(jvmti->RawMonitorWait(gcFinishMonitor, 0))) {

                success = 0;

            }

        }

        if (!NSK_JVMTI_VERIFY(jvmti->RawMonitorExit(gcFinishMonitor))) {

            success = 0;

        }

    } else {

        success = 0;

    }

    nsk_jvmti_aod_disableEventsAndFinish(agentName, testEvents, testEventsNumber, success, jvmti, jni);

}

int startAuxiliaryThread(jvmtiEnv* jvmti, JNIEnv* jni) {

    jthread thread;

    if (!NSK_VERIFY((thread = nsk_jvmti_aod_createThread(jni)) != NULL))

        return NSK_FALSE;

        return NSK_FALSE;

    }

    NSK_DISPLAY1("%s: auxiliary thread was started\n", agentName);

    return NSK_TRUE;

}

#ifdef STATIC_BUILD

JNIEXPORT jint JNI_OnLoad_attach020Agent00(JavaVM *jvm, char *options, void *reserved) {

    return JNI_VERSION_1_8;

}

#endif

JNIEXPORT jint JNICALL

#ifdef STATIC_BUILD

Agent_OnAttach_attach020Agent00(JavaVM *vm, char *optionsString, void *reserved)

#else

Agent_OnAttach(JavaVM *vm, char *optionsString, void *reserved)

#endif

{

    jvmtiEnv* jvmti;

    jvmtiEventCallbacks eventCallbacks;

    jvmtiCapabilities caps;

    JNIEnv* jni;

    if (!NSK_VERIFY((options = (Options*) nsk_aod_createOptions(optionsString)) != NULL))

        return JNI_ERR;

    agentName = nsk_aod_getOptionValue(options, NSK_AOD_AGENT_NAME_OPTION);

    if ((jni = (JNIEnv*) nsk_aod_createJNIEnv(vm)) == NULL)

        return JNI_ERR;

    if (!NSK_VERIFY((jvmti = nsk_jvmti_createJVMTIEnv(vm, reserved)) != NULL))

        return JNI_ERR;

    if (!NSK_JVMTI_VERIFY(jvmti->CreateRawMonitor("GCFinishMonitor", &gcFinishMonitor))) {

        return JNI_ERR;

    }

    if (!NSK_VERIFY(startAuxiliaryThread(jvmti, jni)))

        return JNI_ERR;

    memset(&caps, 0, sizeof(caps));

    caps.can_generate_garbage_collection_events = 1;

        return JNI_ERR;

    }

    memset(&eventCallbacks,0, sizeof(eventCallbacks));

    eventCallbacks.GarbageCollectionStart  = garbageCollectionStartHandler;

    eventCallbacks.GarbageCollectionFinish = garbageCollectionFinishHandler;

        return JNI_ERR;

    }

    if (!(nsk_jvmti_aod_enableEvents(jvmti, testEvents, testEventsNumber))) {

        return JNI_ERR;

    }

    NSK_DISPLAY1("%s: initialization was done\n", agentName);

    if (!NSK_VERIFY(nsk_aod_agentLoaded(jni, agentName)))

        return JNI_ERR;

    return JNI_OK;

}

}