1 /*
   2  * Copyright (c) 2003, 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 
  24 #include <string.h>
  25 #include "jvmti.h"
  26 #include "agent_common.h"
  27 #include "jni_tools.h"
  28 #include "jvmti_tools.h"
  29 
  30 extern "C" {
  31 
  32 /* ============================================================================= */
  33 
  34 /* scaffold objects */
  35 static jlong timeout = 0;
  36 
  37 /* constant names */
  38 #define THREAD_NAME     "TestedThread"
  39 
  40 /* ============================================================================= */
  41 
  42 /** Agent algorithm. */
  43 static void JNICALL
  44 agentProc(jvmtiEnv* jvmti, JNIEnv* jni, void* arg) {
  45 
  46     NSK_DISPLAY0("Wait for thread to start\n");
  47     if (!nsk_jvmti_waitForSync(timeout))
  48         return;
  49 
  50     /* perform testing */
  51     {
  52         jthread testedThread = NULL;
  53 
  54         NSK_DISPLAY1("Find thread: %s\n", THREAD_NAME);
  55         if (!NSK_VERIFY((testedThread =
  56                 nsk_jvmti_threadByName(THREAD_NAME)) != NULL))
  57             return;
  58         NSK_DISPLAY1("  ... found thread: %p\n", (void*)testedThread);
  59 
  60         NSK_DISPLAY1("Suspend thread: %p\n", (void*)testedThread);
  61         if (!NSK_JVMTI_VERIFY(jvmti->SuspendThread(testedThread))) {
  62             nsk_jvmti_setFailStatus();
  63             return;
  64         }
  65 
  66         NSK_DISPLAY0("Let thread to run and finish\n");
  67         if (!nsk_jvmti_resumeSync())
  68             return;
  69 
  70         NSK_DISPLAY1("Get state vector for thread: %p\n", (void*)testedThread);
  71         {
  72             jint state = 0;
  73 
  74             if (!NSK_JVMTI_VERIFY(jvmti->GetThreadState(testedThread, &state))) {
  75                 nsk_jvmti_setFailStatus();
  76             }
  77             NSK_DISPLAY2("  ... got state vector: %s (%d)\n",
  78                             TranslateState(state), (int)state);
  79 
  80             if ((state & JVMTI_THREAD_STATE_SUSPENDED) == 0) {
  81                 NSK_COMPLAIN2("SuspendThread() does not turn on flag SUSPENDED:\n"
  82                               "#   state: %s (%d)\n",
  83                               TranslateState(state), (int)state);
  84                 nsk_jvmti_setFailStatus();
  85             }
  86         }
  87 
  88         NSK_DISPLAY1("Resume thread: %p\n", (void*)testedThread);
  89         if (!NSK_JVMTI_VERIFY(jvmti->ResumeThread(testedThread))) {
  90             nsk_jvmti_setFailStatus();
  91         }
  92 
  93         NSK_DISPLAY0("Wait for thread to finish\n");
  94         if (!nsk_jvmti_waitForSync(timeout))
  95             return;
  96 
  97         NSK_DISPLAY0("Delete thread reference\n");
  98         NSK_TRACE(jni->DeleteGlobalRef(testedThread));
  99     }
 100 
 101     NSK_DISPLAY0("Let debugee to finish\n");
 102     if (!nsk_jvmti_resumeSync())
 103         return;
 104 }
 105 
 106 /* ============================================================================= */
 107 
 108 /** Agent library initialization. */
 109 #ifdef STATIC_BUILD
 110 JNIEXPORT jint JNICALL Agent_OnLoad_suspendthrd001(JavaVM *jvm, char *options, void *reserved) {
 111     return Agent_Initialize(jvm, options, reserved);
 112 }
 113 JNIEXPORT jint JNICALL Agent_OnAttach_suspendthrd001(JavaVM *jvm, char *options, void *reserved) {
 114     return Agent_Initialize(jvm, options, reserved);
 115 }
 116 JNIEXPORT jint JNI_OnLoad_suspendthrd001(JavaVM *jvm, char *options, void *reserved) {
 117     return JNI_VERSION_1_8;
 118 }
 119 #endif
 120 jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
 121     jvmtiEnv* jvmti = NULL;
 122 
 123     /* init framework and parse options */
 124     if (!NSK_VERIFY(nsk_jvmti_parseOptions(options)))
 125         return JNI_ERR;
 126 
 127     timeout = nsk_jvmti_getWaitTime() * 60 * 1000;
 128 
 129     /* create JVMTI environment */
 130     if (!NSK_VERIFY((jvmti =
 131             nsk_jvmti_createJVMTIEnv(jvm, reserved)) != NULL))
 132         return JNI_ERR;
 133 
 134     /* add specific capabilities for suspending thread */
 135     {
 136         jvmtiCapabilities suspendCaps;
 137         memset(&suspendCaps, 0, sizeof(suspendCaps));
 138         suspendCaps.can_suspend = 1;
 139         if (!NSK_JVMTI_VERIFY(jvmti->AddCapabilities(&suspendCaps)))
 140             return JNI_ERR;
 141     }
 142 
 143     /* register agent proc and arg */
 144     if (!NSK_VERIFY(nsk_jvmti_setAgentProc(agentProc, NULL)))
 145         return JNI_ERR;
 146 
 147     return JNI_OK;
 148 }
 149 
 150 /* ============================================================================= */
 151 
 152 }