Mercurial > hg > graal-compiler
view agent/src/os/win32/Buffer.hpp @ 1837:c99c53f07c14
6692906: CMS: parallel concurrent marking may be prone to hanging or stalling mutators for periods of time
Summary: Inserted missing yield(check)s in closures used during the work-stealing phase of parallel concurrent marking, a missing synchronous yield-request in the cms perm gen allocation path, and a terminator-terminator for the offer_termination invocation that monitors the yield status of the concurrent marking task. Elaborated some documentation comments and made some task queue termination loop flags configurable at start-up to aid debugging in the field.
Reviewed-by: jmasa, johnc, poonam
author | ysr |
---|---|
date | Wed, 29 Sep 2010 16:17:02 -0700 |
parents | c18cbe5936b8 |
children |
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/* * Copyright (c) 2001, 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. * */ #ifndef _BUFFER_ #define _BUFFER_ // A Buffer is the backing store for the IOBuf abstraction and // supports producer-consumer filling and draining. class Buffer { public: Buffer(int bufSize); ~Buffer(); char* fillPos(); // Position of the place where buffer should be filled int remaining(); // Number of bytes that can be placed starting at fillPos int size(); // Size of the buffer // Move up fill position by amount (decreases remaining()); returns // false if not enough space bool incrFillPos(int amt); // Read single byte (0..255); returns -1 if no data available. int readByte(); // Read multiple bytes, non-blocking (this buffer does not define a // fill mechanism), into provided buffer. Returns number of bytes read. int readBytes(char* buf, int len); // Access to drain position. Be very careful using this. char* drainPos(); int drainRemaining(); bool incrDrainPos(int amt); // Compact buffer, removing already-consumed input. This must be // called periodically to yield the illusion of an infinite buffer. void compact(); private: Buffer(const Buffer&); Buffer& operator=(const Buffer&); char* buf; int sz; int fill; int drain; }; #endif // #defined _BUFFER_