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view agent/src/share/classes/sun/jvm/hotspot/code/CompressedStream.java @ 17716:cdb71841f4bc
6498581: ThreadInterruptTest3 produces wrong output on Windows
Summary: There is race condition between os::interrupt and os::is_interrupted on Windows. In JVM_Sleep(Thread.sleep), check if thread gets interrupted, it may see interrupted but not really interrupted so cause spurious waking up (early return from sleep). Fix by checking if interrupt event really gets set thus prevent false return. For intrinsic of _isInterrupted, on Windows, go fastpath only on bit not set.
Reviewed-by: acorn, kvn
Contributed-by: david.holmes@oracle.com, yumin.qi@oracle.com
author | minqi |
---|---|
date | Wed, 26 Feb 2014 15:20:41 -0800 |
parents | c18cbe5936b8 |
children |
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/* * Copyright (c) 2000, 2005, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ package sun.jvm.hotspot.code; import sun.jvm.hotspot.debugger.*; /** NOTE that this class takes the address of a buffer. This means that it can read previously-generated debug information directly from the target VM. However, it also means that you can't create a "wrapper" object for a CompressedStream down in the VM. It looks like these are only kept persistently in OopMaps, and the code has been special-cased in OopMap.java to handle this. */ public class CompressedStream { protected Address buffer; protected int position; /** Equivalent to CompressedStream(buffer, 0) */ public CompressedStream(Address buffer) { this(buffer, 0); } public CompressedStream(Address buffer, int position) { this.buffer = buffer; this.position = position; } public Address getBuffer() { return buffer; } public static final int LogBitsPerByte = 3; public static final int BitsPerByte = 1 << 3; // Constants for UNSIGNED5 coding of Pack200 public static final int lg_H = 6; public static final int H = 1<<lg_H; // number of high codes (64) public static final int L = (1<<BitsPerByte) - H; // number of low codes (192) public static final int MAX_i = 4; // bytes are numbered in (0..4) // Positioning public int getPosition() { return position; } public void setPosition(int position) { this.position = position; } // 32-bit one-to-one sign encoding taken from Pack200 // converts leading sign bits into leading zeros with trailing sign bit public int encodeSign(int value) { return (value << 1) ^ (value >> 31); } public int decodeSign(int value) { return (value >>> 1) ^ -(value & 1); } // 32-bit self-inverse encoding of float bits // converts trailing zeros (common in floats) to leading zeros public int reverseInt(int i) { // Hacker's Delight, Figure 7-1 i = (i & 0x55555555) << 1 | (i >>> 1) & 0x55555555; i = (i & 0x33333333) << 3 | (i >>> 2) & 0x33333333; i = (i & 0x0f0f0f0f) << 4 | (i >>> 4) & 0x0f0f0f0f; i = (i << 24) | ((i & 0xff00) << 8) | ((i >>> 8) & 0xff00) | (i >>> 24); return i; } }