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