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
42extern "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 */
48extern jboolean
49tryToAcquireReentrancyToken(    jvmtiEnv *  jvmtienv,
50                                jthread     thread);
51
52/* release the token; assumes we already hold it */
53extern void
54releaseReentrancyToken(         jvmtiEnv *  jvmtienv,
55                                jthread     thread);
56
57
58#ifdef __cplusplus
59} /* extern "C" */
60#endif /* __cplusplus */
61
62
63#endif
64