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 <jni.h> 24 #include <stdio.h> 25 #include <time.h> 26 #include "jni_tools.h" 27 28 extern "C" { 29 30 static jfieldID objFieldId = NULL; 31 32 /* 33 * Class: nsk_share_gc_lock_jni_ByteArrayCriticalLocker 34 * Method: criticalNative 35 */ 36 JNIEXPORT jbyte JNICALL Java_nsk_share_gc_lock_jni_ByteArrayCriticalLocker_criticalNative 37 (JNIEnv *env, jobject o, jlong enterTime, jlong sleepTime) { 38 jsize size, i; 39 jbyteArray arr; 40 jbyte *pa; 41 jbyte hash = 0; 42 time_t start_time, current_time; 43 44 if (objFieldId == NULL) { 45 jclass klass = env->GetObjectClass(o); 46 if (klass == NULL) { 47 printf("Error: GetObjectClass returned NULL\n"); 48 return 0; 49 } 50 objFieldId = env->GetFieldID(klass, "obj", "Ljava/lang/Object;"); 51 if (objFieldId == NULL) { 52 printf("Error: GetFieldID returned NULL\n"); 53 return 0; 54 } 55 } 56 arr = (jbyteArray) env->GetObjectField(o, objFieldId); 57 if (arr == NULL) { 58 printf("Error: GetObjectField returned NULL\n"); 59 return 0; 60 } 61 env->SetObjectField(o, objFieldId, NULL); 62 size = env->GetArrayLength(arr); 63 start_time = time(NULL); 64 enterTime /= 1000; 65 current_time = 0; 66 while (current_time - start_time < enterTime) { 67 pa = (jbyte*) env->GetPrimitiveArrayCritical(arr, NULL); 68 if (pa != NULL) { 69 for (i = 0; i < size; ++i) 70 hash ^= pa[i]; 71 } else { 72 hash = 0; 73 } 74 mssleep((long) sleepTime); 75 env->ReleasePrimitiveArrayCritical(arr, pa, 0); 76 mssleep((long) sleepTime); 77 current_time = time(NULL); 78 } 79 env->SetObjectField(o, objFieldId, arr); 80 return hash; 81 } 82 83 }