50 lines
1.6 KiB
C
50 lines
1.6 KiB
C
/*
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* Copyright (c) 2007, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include <jni.h>
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static volatile int release_critical = 0;
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JNIEXPORT jboolean JNICALL Java_gc_cslocker_CSLocker_lock
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(JNIEnv *env, jobject obj, jintArray array)
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{
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jboolean retval = JNI_TRUE;
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void *nativeArray = (*env)->GetPrimitiveArrayCritical(env, array, 0);
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if (nativeArray == NULL) {
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retval = JNI_FALSE;
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}
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// deadblock
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while (!release_critical) /* empty */;
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(*env)->ReleasePrimitiveArrayCritical(env, array, nativeArray, 0);
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return retval;
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}
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JNIEXPORT void JNICALL Java_gc_cslocker_CSLocker_unlock
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(JNIEnv *env, jobject obj)
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{
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release_critical = 1;
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}
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