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 "ExceptionCheckingJniEnv.hpp" 27 #include "jni_tools.h" 28 29 extern "C" { 30 31 static jfieldID objFieldId = NULL; 32 33 /* 34 * Class: nsk_share_gc_lock_jniref_JNIRefLocker 35 * Method: criticalNative 36 * Signature: (JJ)V 37 */ 38 JNIEXPORT void JNICALL Java_nsk_share_gc_lock_jniref_JNIRefLocker_criticalNative 39 (JNIEnv *jni_env, jobject o, jlong enterTime, jlong sleepTime) { 40 ExceptionCheckingJniEnvPtr env(jni_env); 41 42 jobject obj; 43 jobject gref, lref, gwref; 44 time_t start_time, current_time; 45 46 if (objFieldId == NULL) { 47 jclass klass = env->GetObjectClass(o); 48 objFieldId = env->GetFieldID(klass, "obj", "Ljava/lang/Object;"); 49 } 50 51 obj = env->GetObjectField(o, objFieldId); 52 env->SetObjectField(o, objFieldId, NULL); 53 54 start_time = time(NULL); 55 enterTime /= 1000; 56 current_time = 0; 57 while (current_time - start_time < enterTime) { 58 gref = env->NewGlobalRef(obj); 59 lref = env->NewLocalRef(obj); 60 gwref = env->NewWeakGlobalRef(obj); 61 mssleep((long) sleepTime); 62 env->DeleteGlobalRef(gref); 63 env->DeleteLocalRef(lref); 64 env->DeleteWeakGlobalRef(gwref); 65 mssleep((long) sleepTime); 66 current_time = time(NULL); 67 } 68 env->SetObjectField(o, objFieldId, obj); 69 } 70 71 }