1 /* 2 * Copyright (c) 2003, 2007, 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 /* 27 * Copyright 2003 Wily Technology, Inc. 28 */ 29 30 #ifndef _REENTRANCY_H_ 31 #define _REENTRANCY_H_ 32 33 #include <jni.h> 34 35 /* 36 * This module provides some utility functions to support the "same thread" re-entrancy management. 37 * Uses JVMTI TLS to store a single bit per thread. 38 * Non-zero means the thread is already inside; zero means the thread is not inside. 39 */ 40 41 #ifdef __cplusplus 42 extern "C" { 43 #endif 44 45 /* returns true if the token is acquired by this call, 46 * false if we already hold it and do not have to acquire it 47 */ 48 extern jboolean 49 tryToAcquireReentrancyToken( jvmtiEnv * jvmtienv, 50 jthread thread); 51 52 /* release the token; assumes we already hold it */ 53 extern void 54 releaseReentrancyToken( jvmtiEnv * jvmtienv, 55 jthread thread); 56 57 58 #ifdef __cplusplus 59 } /* extern "C" */ 60 #endif /* __cplusplus */ 61 62 63 #endif 64