1 /* 2 * Copyright (c) 2007, 2017 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 <jni.h> 25 26 static volatile int release_critical = 0; 27 28 JNIEXPORT jboolean JNICALL Java_CSLocker_lock 29 (JNIEnv *env, jobject obj, jintArray array) 30 { 31 jboolean retval = JNI_TRUE; 32 void *nativeArray = (*env)->GetPrimitiveArrayCritical(env, array, 0); 33 34 if (nativeArray == NULL) { 35 retval = JNI_FALSE; 36 } 37 38 // deadblock 39 while (!release_critical) /* empty */; 40 41 (*env)->ReleasePrimitiveArrayCritical(env, array, nativeArray, 0); 42 return retval; 43 } 44 45 JNIEXPORT void JNICALL Java_CSLocker_unlock 46 (JNIEnv *env, jobject obj) 47 { 48 release_critical = 1; 49 }