/*

 * Copyright (c) 2004, 2019, 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 <stdlib.h>

#include <string.h>

#include "jni_tools.h"

#include "agent_common.h"

#include "jvmti_tools.h"

extern "C" {

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

static const jlong EXPECTED_TIMEOUT = 1;

/*

 * The expected timeout accuracy was already increased from 100000 to 300000.

 * Please, do not increase it anymore if the test still fails with the message:

 *  "(waitedTime - waitTime) >= (EXPECTED_TIMEOUT * 1000000) - EXPECTED_TIMEOUT_ACCURACY_NS"

 */

static const jlong EXPECTED_TIMEOUT_ACCURACY_NS = 300000;

#if (defined(WIN32) || defined(_WIN32))

static const jlong EXPECTED_ACCURACY = 16; // 16ms is longest clock update interval

#else

static const jlong EXPECTED_ACCURACY = 10; // high frequency clock updates expected

#endif

/* scaffold objects */

static jlong timeout = 0;

/* test objects */

static jthread thread = NULL;

static jobject object_M = NULL;

static volatile int waitEventsCount = 0;

static volatile int waitedEventsCount = 0;

static jlong waitTime = 0;

static jlong waitThreadCpuTime = 0;

static jlong waitedTime = 0;

static jlong waitedThreadCpuTime = 0;

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

void JNICALL

MonitorWait(jvmtiEnv *jvmti, JNIEnv* jni,

        jthread thr, jobject obj, jlong tout) {

    char buffer[32];

    if (!NSK_VERIFY(thr != NULL)) {

        nsk_jvmti_setFailStatus();

        return;

    }

    if (!NSK_VERIFY(obj != NULL)) {

        nsk_jvmti_setFailStatus();

        return;

    }

    /* check if event is for tested thread and object */

    if (jni->IsSameObject(thread, thr) &&

            jni->IsSameObject(object_M, obj)) {

        if (!NSK_JVMTI_VERIFY(jvmti->GetThreadCpuTime(thr, &waitThreadCpuTime))) {

            nsk_jvmti_setFailStatus();

        }

        if (!NSK_JVMTI_VERIFY(jvmti->GetTime(&waitTime))) {

            nsk_jvmti_setFailStatus();

        }

        waitEventsCount++;

        NSK_DISPLAY0("MonitorWait event:\n");

        NSK_DISPLAY3("\tthread: %p, object: %p, timeout: %s\n",

            thr, obj, jlong_to_string(tout, buffer));

        NSK_DISPLAY1("\ttime: %s\n",

            jlong_to_string(waitTime, buffer));

        NSK_DISPLAY1("\tthread CPU time: %s\n",

            jlong_to_string(waitThreadCpuTime, buffer));

        if (!NSK_VERIFY(tout == EXPECTED_TIMEOUT)) {

            nsk_jvmti_setFailStatus();

        }

    }

}

void JNICALL

MonitorWaited(jvmtiEnv *jvmti, JNIEnv* jni,

        jthread thr, jobject obj, jboolean timed_out) {

    char buffer[32];

    if (!NSK_VERIFY(thr != NULL)) {

        nsk_jvmti_setFailStatus();

        return;

    }

    if (!NSK_VERIFY(obj != NULL)) {

        nsk_jvmti_setFailStatus();

        return;

    }

    /* check if event is for tested thread and object */

    if (jni->IsSameObject(thread, thr) &&

            jni->IsSameObject(object_M, obj)) {

        if (!NSK_JVMTI_VERIFY(jvmti->GetThreadCpuTime(thr, &waitedThreadCpuTime))) {

            nsk_jvmti_setFailStatus();

        }

        if (!NSK_JVMTI_VERIFY(jvmti->GetTime(&waitedTime))) {

            nsk_jvmti_setFailStatus();

        }

        waitedEventsCount++;

        NSK_DISPLAY0("MonitorWaited event:\n");

        NSK_DISPLAY3("\tthread: %p, object: %p, timed_out: %s\n",

            thr, obj, (timed_out == JNI_TRUE) ? "true" : "false");

        NSK_DISPLAY1("\tGetTime: %s\n",

            jlong_to_string(waitedTime, buffer));

        NSK_DISPLAY1("\tthread CPU time: %s\n",

            jlong_to_string(waitedThreadCpuTime, buffer));

    }

}

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

static int prepare(jvmtiEnv* jvmti, JNIEnv* jni) {

    const char* THREAD_NAME = "Debuggee Thread";

    const char* FIELD_SIG = "Ljava/lang/Object;";

    jvmtiThreadInfo info;

    jthread *threads = NULL;

    jint threads_count = 0;

    jfieldID field = NULL;

    jclass klass = NULL;

    int i;

    NSK_DISPLAY0("Prepare: find tested thread\n");

    /* get all live threads */

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

        return NSK_FALSE;

    if (!NSK_VERIFY(threads_count > 0 && threads != NULL))

        return NSK_FALSE;

    /* find tested thread */

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

        if (!NSK_VERIFY(threads[i] != NULL))

            return NSK_FALSE;

        /* get thread information */

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

            return NSK_FALSE;

        NSK_DISPLAY3("    thread #%d (%s): %p\n", i, info.name, threads[i]);

        /* find by name */

        if (info.name != NULL && (strcmp(info.name, THREAD_NAME) == 0)) {

            thread = threads[i];

        }

        if (info.name != NULL) {

            if (!NSK_JVMTI_VERIFY(jvmti->Deallocate((unsigned char*)info.name)))

                return NSK_FALSE;

        }

    }

    /* deallocate threads list */

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

        return NSK_FALSE;

    if (thread == NULL) {

        NSK_COMPLAIN0("Debuggee thread not found");

        return NSK_FALSE;

    }

    /* make thread accessable for a long time */

    if (!NSK_JNI_VERIFY(jni, (thread = jni->NewGlobalRef(thread)) != NULL))

        return NSK_FALSE;

    /* get tested thread class */

    if (!NSK_JNI_VERIFY(jni, (klass = jni->GetObjectClass(thread)) != NULL))

        return NSK_FALSE;

    /* get tested thread field 'M' */

    if (!NSK_JNI_VERIFY(jni, (field = jni->GetFieldID(klass, "M", FIELD_SIG)) != NULL))

        return NSK_FALSE;

    if (!NSK_JNI_VERIFY(jni, (object_M = jni->GetObjectField(thread, field)) != NULL))

        return NSK_FALSE;

    /* make object accessable for a long time */

    if (!NSK_JNI_VERIFY(jni, (object_M = jni->NewGlobalRef(object_M)) != NULL))

        return NSK_FALSE;

    /* enable MonitorWait event */

    if (!NSK_JVMTI_VERIFY(

            jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_MONITOR_WAIT, NULL)))

        return NSK_FALSE;

    /* enable MonitorWaited event */

    if (!NSK_JVMTI_VERIFY(

            jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_MONITOR_WAITED, NULL)))

        return NSK_FALSE;

    return NSK_TRUE;

}

static int clean(jvmtiEnv* jvmti, JNIEnv* jni) {

    /* disable MonitorWait event */

    if (!NSK_JVMTI_VERIFY(

            jvmti->SetEventNotificationMode(JVMTI_DISABLE, JVMTI_EVENT_MONITOR_WAIT, NULL)))

        nsk_jvmti_setFailStatus();

    /* disable MonitorWaited event */

    if (!NSK_JVMTI_VERIFY(

            jvmti->SetEventNotificationMode(JVMTI_DISABLE, JVMTI_EVENT_MONITOR_WAITED, NULL)))

        nsk_jvmti_setFailStatus();

    return NSK_TRUE;

}

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

/* agent algorithm */

static void JNICALL

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

    char buffer[32];

    /* wait for initial sync */

    if (!nsk_jvmti_waitForSync(timeout))

        return;

    if (!prepare(jvmti, jni)) {

        nsk_jvmti_setFailStatus();

        return;

    }

    /* resume debugee to catch MonitorContendedEntered events */

    if (!(NSK_VERIFY(nsk_jvmti_resumeSync()) &&

          NSK_VERIFY(nsk_jvmti_waitForSync(timeout))))

        return;

    NSK_DISPLAY1("Number of MonitorWait events: %d\n", waitEventsCount);

    if (!(NSK_VERIFY(waitEventsCount == 1))) {

        nsk_jvmti_setFailStatus();

    }

    NSK_DISPLAY1("Number of MonitorWaited events: %d\n", waitedEventsCount);

    if (!(NSK_VERIFY(waitedEventsCount == 1))) {

        nsk_jvmti_setFailStatus();

    }

    NSK_DISPLAY1("Time frame between the events: %s ns\n",

        jlong_to_string(waitedTime - waitTime, buffer));

    if (!(NSK_VERIFY((waitedTime - waitTime) >= (EXPECTED_TIMEOUT * 1000000) - EXPECTED_TIMEOUT_ACCURACY_NS))) {

#if (defined(WIN32) || defined(_WIN32))

        /* Do not fail on Windows as early returns are expected and wait() treats them as spurious wakeups. */

#else

        nsk_jvmti_setFailStatus();

#endif

        printf("waitedTime: %" LL "d,  waitTime: %" LL "d, waitedTime - waitTime: %" LL "d\n",

                waitedTime, waitTime, waitedTime - waitTime);

    }

    NSK_DISPLAY1("Thread CPU time between the events: %s ns\n",

        jlong_to_string(waitedThreadCpuTime - waitThreadCpuTime, buffer));

    if (!(NSK_VERIFY((waitedThreadCpuTime - waitThreadCpuTime)

            < (EXPECTED_ACCURACY * 1000000)))) {

        nsk_jvmti_setFailStatus();

        printf("waitedThreadCpuTime: %" LL "d, waitThreadCpuTime: %" LL "d, waitedThreadCpuTime - waitThreadCpuTime: %" LL "d\n",

                waitedThreadCpuTime, waitThreadCpuTime, waitedThreadCpuTime - waitThreadCpuTime);

    }

    if (!clean(jvmti, jni)) {

        nsk_jvmti_setFailStatus();

        return;

    }

    /* resume debugee after last sync */

    if (!nsk_jvmti_resumeSync())

        return;

}

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

/* agent library initialization */

#ifdef STATIC_BUILD

JNIEXPORT jint JNICALL Agent_OnLoad_tc05t001(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNICALL Agent_OnAttach_tc05t001(JavaVM *jvm, char *options, void *reserved) {

    return Agent_Initialize(jvm, options, reserved);

}

JNIEXPORT jint JNI_OnLoad_tc05t001(JavaVM *jvm, char *options, void *reserved) {

    return JNI_VERSION_1_8;

}

#endif

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

    jvmtiEnv* jvmti = NULL;

    jvmtiCapabilities caps;

    jvmtiEventCallbacks callbacks;

    /* init framework and parse options */

    if (!NSK_VERIFY(nsk_jvmti_parseOptions(options)))

        return JNI_ERR;

    timeout = nsk_jvmti_getWaitTime() * 60000;

    NSK_DISPLAY1("Timeout: %d msc\n", (int)timeout);

    /* create JVMTI environment */

    if (!NSK_VERIFY((jvmti =

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

        return JNI_ERR;

    /* add capabilities */

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

    caps.can_generate_monitor_events = 1;

    caps.can_get_thread_cpu_time = 1;

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

        return JNI_ERR;

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

    callbacks.MonitorWait = &MonitorWait;

    callbacks.MonitorWaited = &MonitorWaited;

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

        return JNI_ERR;

    /* register agent proc and arg */

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

        return JNI_ERR;

    return JNI_OK;

}

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

}