1 Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved. 2 DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 4 This code is free software; you can redistribute it and/or modify it 5 under the terms of the GNU General Public License version 2 only, as 6 published by the Free Software Foundation. 7 8 This code is distributed in the hope that it will be useful, but WITHOUT 9 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 11 version 2 for more details (a copy is included in the LICENSE file that 12 accompanied this code). 13 14 You should have received a copy of the GNU General Public License version 15 2 along with this work; if not, write to the Free Software Foundation, 16 Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 17 18 Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 19 or visit www.oracle.com if you need additional information or have any 20 questions. 21 22 All gc/lock/ tests do approximately the same thing. They verify that GC 23 is appropriately synchronized with certain class of functions. 24 25 - gc/lock/jni - uses JNI GetPrimitiveArrayCritical and GetStringCritical 26 - gc/lock/jniref - uses JNI NewGlobalRef, NewLocalRef, NewWeakGlobalRef 27 - gc/lock/malloc - uses malloc() 28 - gc/lock/jvmti - uses JVMTI Allocate 29 30 A number of threads is started. There are some threads that repeatedly 31 enter a critical section of code where functions describe above are 32 repeatedly called in a loop. There are also some threads that eat 33 memory in a loop. The idea here is to force GC to crash or deadlock.