/*

 * Copyright (c) 2003, 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 <string.h>

#include "jvmti.h"

#include "agent_common.h"

#include "jni_tools.h"

#include "jvmti_tools.h"

extern "C" {

/* ============================================================================= */

/* scaffold objects */

static jlong timeout = 0;

/* constant names */

#define THREAD_NAME     "TestedThread"

/* constants */

#define DEFAULT_THREADS_COUNT   10

#define EVENTS_COUNT            1

/* events list */

static jvmtiEvent eventsList[EVENTS_COUNT] = {

    JVMTI_EVENT_THREAD_END

};

static int threadsCount = 0;

static jthread* threads = NULL;

static volatile int eventsReceived = 0;

static jrawMonitorID eventsReceivedMtx = 0;

/* ============================================================================= */

static int fillThreadsByName(jvmtiEnv* jvmti, JNIEnv* jni,

                                const char name[], int foundCount, jthread foundThreads[]);

/** Agent algorithm. */

static void JNICALL

agentProc(jvmtiEnv* jvmti, JNIEnv* jni, void* arg) {

    NSK_DISPLAY0("Wait for threads to start\n");

    if (!nsk_jvmti_waitForSync(timeout))

        return;

    /* perform testing */

    {

        jvmtiError* results = NULL;

        int i;

        NSK_DISPLAY1("Allocate threads array: %d threads\n", threadsCount);

        if (!NSK_JVMTI_VERIFY(jvmti->Allocate((threadsCount * sizeof(jthread)),

                                              (unsigned char**)&threads))) {

            nsk_jvmti_setFailStatus();

            return;

        }

        NSK_DISPLAY1("  ... allocated array: %p\n", (void*)threads);

        NSK_DISPLAY1("Allocate results array: %d threads\n", threadsCount);

        if (!NSK_JVMTI_VERIFY(jvmti->Allocate((threadsCount * sizeof(jvmtiError)),

                                              (unsigned char**)&results))) {

            nsk_jvmti_setFailStatus();

            return;

        }

        NSK_DISPLAY1("  ... allocated array: %p\n", (void*)threads);

        NSK_DISPLAY1("Find threads: %d threads\n", threadsCount);

        if (!NSK_VERIFY(fillThreadsByName(jvmti, jni, THREAD_NAME, threadsCount, threads)))

            return;

        NSK_DISPLAY0("Suspend threads list\n");

        if (!NSK_JVMTI_VERIFY(jvmti->SuspendThreadList(threadsCount, threads, results))) {

            nsk_jvmti_setFailStatus();

            return;

        }

        NSK_DISPLAY0("Check threads results:\n");

        for (i = 0; i < threadsCount; i++) {

            NSK_DISPLAY3("  ... thread #%d: %s (%d)\n",

                                i, TranslateError(results[i]), (int)results[i]);

            if (!NSK_JVMTI_VERIFY(results[i]))

                nsk_jvmti_setFailStatus();

        }

        eventsReceived = 0;

        NSK_DISPLAY1("Enable event: %s\n", "THREAD_END");

        if (!nsk_jvmti_enableEvents(JVMTI_ENABLE, EVENTS_COUNT, eventsList, NULL))

            return;

        NSK_DISPLAY0("Let threads to run and finish\n");

        if (!nsk_jvmti_resumeSync())

            return;

        NSK_DISPLAY0("Resume threads list\n");

        if (!NSK_JVMTI_VERIFY(jvmti->ResumeThreadList(threadsCount, threads, results))) {

            nsk_jvmti_setFailStatus();

            return;

        }

        NSK_DISPLAY0("Check threads results:\n");

        for (i = 0; i < threadsCount; i++) {

            NSK_DISPLAY3("  ... thread #%d: %s (%d)\n",

                                i, TranslateError(results[i]), (int)results[i]);

            if (!NSK_JVMTI_VERIFY(results[i]))

                nsk_jvmti_setFailStatus();

        }

        NSK_DISPLAY1("Check that THREAD_END events received for timeout: %ld ms\n", (long)timeout);

        {

            jlong delta = 1000;

            jlong time;

            for (time = 0; time < timeout; time += delta) {

                if (eventsReceived >= threadsCount)

                    break;

                nsk_jvmti_sleep(delta);

            }

            if (eventsReceived < threadsCount) {

                NSK_COMPLAIN1("Some threads have not ran and finished after resuming: %d threads\n",

                                                        (threadsCount - eventsReceived));

                nsk_jvmti_setFailStatus();

            }

        }

        NSK_DISPLAY1("Disable event: %s\n", "THREAD_END");

        if (!nsk_jvmti_enableEvents(JVMTI_DISABLE, EVENTS_COUNT, eventsList, NULL))

            return;

        NSK_DISPLAY0("Wait for thread to finish\n");

        if (!nsk_jvmti_waitForSync(timeout))

            return;

        NSK_DISPLAY0("Delete threads references\n");

        for (i = 0; i < threadsCount; i++) {

            if (threads[i] != NULL)

                NSK_TRACE(jni->DeleteGlobalRef(threads[i]));

        }

        NSK_DISPLAY1("Deallocate threads array: %p\n", (void*)threads);

        if (!NSK_JVMTI_VERIFY(jvmti->Deallocate((unsigned char*)threads))) {

            nsk_jvmti_setFailStatus();

        }

        NSK_DISPLAY1("Deallocate results array: %p\n", (void*)results);

        if (!NSK_JVMTI_VERIFY(jvmti->Deallocate((unsigned char*)results))) {

            nsk_jvmti_setFailStatus();

        }

    }

    NSK_DISPLAY0("Let debugee to finish\n");

    if (!nsk_jvmti_resumeSync())

        return;

}

/* ============================================================================= */

/** Find threads whose name starts with specified name prefix. */

static int fillThreadsByName(jvmtiEnv* jvmti, JNIEnv* jni,

                            const char name[], int foundCount, jthread foundThreads[]) {

    jint count = 0;

    jthread* threads = NULL;

    size_t len = strlen(name);

    int found = 0;

    int i;

    for (i = 0; i < foundCount; i++) {

        foundThreads[i] = NULL;

    }

    if (!NSK_JVMTI_VERIFY(jvmti->GetAllThreads(&count, &threads))) {

        nsk_jvmti_setFailStatus();

        return NSK_FALSE;

    }

    found = 0;

    for (i = 0; i < count; i++) {

        jvmtiThreadInfo info;

        if (!NSK_JVMTI_VERIFY(jvmti->GetThreadInfo(threads[i], &info))) {

            nsk_jvmti_setFailStatus();

            break;

        }

        if (info.name != NULL && strncmp(name, info.name, len) == 0) {

            NSK_DISPLAY3("  ... found thread #%d: %p (%s)\n",

                                    found, threads[i], info.name);

            if (found < foundCount)

                foundThreads[found] = threads[i];

            found++;

        }

    }

    if (!NSK_JVMTI_VERIFY(jvmti->Deallocate((unsigned char*)threads))) {

        nsk_jvmti_setFailStatus();

        return NSK_FALSE;

    }

    if (found != foundCount) {

        NSK_COMPLAIN3("Unexpected number of tested threads found:\n"

                      "#   name:     %s\n"

                      "#   found:    %d\n"

                      "#   expected: %d\n",

                      name, found, foundCount);

        nsk_jvmti_setFailStatus();

        return NSK_FALSE;

    }

    NSK_DISPLAY1("Make global references for threads: %d threads\n", foundCount);

    for (i = 0; i < foundCount; i++) {

        if (!NSK_JNI_VERIFY(jni, (foundThreads[i] = (jthread)

                    jni->NewGlobalRef(foundThreads[i])) != NULL)) {

            nsk_jvmti_setFailStatus();

            return NSK_FALSE;

        }

        NSK_DISPLAY2("  ... thread #%d: %p\n", i, foundThreads[i]);

    }

    return NSK_TRUE;

}

/* ============================================================================= */

/** THREAD_END callback. */

JNIEXPORT void JNICALL

callbackThreadEnd(jvmtiEnv* jvmti, JNIEnv* jni, jthread thread) {

    int i = 0;

    jvmtiError e = jvmti->RawMonitorEnter(eventsReceivedMtx);

        NSK_DISPLAY1("  ... ERROR entering raw monitor for thread %p\n", (void *) thread);

        return;

    }

    /* check if event is for tested thread */

    for (i = 0; i < threadsCount; i++) {

        if (thread != NULL &&

                jni->IsSameObject(threads[i], thread)) {

            NSK_DISPLAY2("  ... received THREAD_END event for thread #%d: %p\n",

                                                                    i, (void*)thread);

            eventsReceived++;

            jvmti->RawMonitorExit(eventsReceivedMtx);

            return;

        }

    }

    jvmti->RawMonitorExit(eventsReceivedMtx);

    NSK_DISPLAY1("  ... received THREAD_END event for unknown thread: %p\n", (void*)thread);

}

/* ============================================================================= */

/** Agent library initialization. */

#ifdef STATIC_BUILD

JNIEXPORT jint JNICALL Agent_OnLoad_resumethrdlst002(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNICALL Agent_OnAttach_resumethrdlst002(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNI_OnLoad_resumethrdlst002(JavaVM *jvm, char *options, void *reserved) {

    return JNI_VERSION_1_8;

}

#endif

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

    jvmtiEnv* jvmti = NULL;

    /* init framework and parse options */

    if (!NSK_VERIFY(nsk_jvmti_parseOptions(options)))

        return JNI_ERR;

    timeout = nsk_jvmti_getWaitTime() * 60 * 1000;

    /* get options */

    threadsCount = nsk_jvmti_findOptionIntValue("threads", DEFAULT_THREADS_COUNT);

    if (!NSK_VERIFY(threadsCount > 0))

        return JNI_ERR;

    /* create JVMTI environment */

    if (!NSK_VERIFY((jvmti =

            nsk_jvmti_createJVMTIEnv(jvm, reserved)) != NULL))

        return JNI_ERR;

    /* add specific capabilities for suspending thread */

    {

        jvmtiCapabilities suspendCaps;

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

        suspendCaps.can_suspend = 1;

        if (!NSK_JVMTI_VERIFY(jvmti->AddCapabilities(&suspendCaps)))

            return JNI_ERR;

    }

    /* set callbacks for THREAD_END event */

    {

        jvmtiEventCallbacks callbacks;

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

        callbacks.ThreadEnd = callbackThreadEnd;

        if (!NSK_JVMTI_VERIFY(jvmti->SetEventCallbacks(&callbacks, sizeof(callbacks))))

        return JNI_ERR;

    }

    /* create a mutex for the eventsReceived variable */

    {

            return JNI_ERR;

        }

    }

    /* register agent proc and arg */

    if (!NSK_VERIFY(nsk_jvmti_setAgentProc(agentProc, NULL)))

        return JNI_ERR;

    return JNI_OK;

}

/* ============================================================================= */

}