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annotate ASSEMBLY_EXCEPTION @ 1842:6e0aac35bfa9

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6980838: G1: guarantee(false) failed: thread has an unexpected active value in its SATB queue Summary: Under certain circumstances a safepoint could happen between a JavaThread object being created and that object being added to the Java threads list. This could cause the active field of that thread's SATB queue to get out-of-sync with respect to the other Java threads. The solution is to activate the SATB queue, when necessary, before adding the thread to the Java threads list, not when the JavaThread object is created. The changeset also includes a small fix to rename the surrogate locker thread from "Surrogate Locker Thread (CMS)" to "Surrogate Locker Thread (Concurrent GC)" since it's also used in G1. Reviewed-by: iveresov, ysr, johnc, jcoomes
author tonyp
date Fri, 01 Oct 2010 16:43:05 -0400
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2 OPENJDK ASSEMBLY EXCEPTION
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4 The OpenJDK source code made available by Oracle at openjdk.java.net and
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5 openjdk.dev.java.net ("OpenJDK Code") is distributed under the terms of the
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6 GNU General Public License <http://www.gnu.org/copyleft/gpl.html> version 2
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7 only ("GPL2"), with the following clarification and special exception.
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9 Linking this OpenJDK Code statically or dynamically with other code
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10 is making a combined work based on this library. Thus, the terms
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11 and conditions of GPL2 cover the whole combination.
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13 As a special exception, Oracle gives you permission to link this
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14 OpenJDK Code with certain code licensed by Oracle as indicated at
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15 http://openjdk.java.net/legal/exception-modules-2007-05-08.html
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16 ("Designated Exception Modules") to produce an executable,
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17 regardless of the license terms of the Designated Exception Modules,
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18 and to copy and distribute the resulting executable under GPL2,
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19 provided that the Designated Exception Modules continue to be
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20 governed by the licenses under which they were offered by Oracle.
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22 As such, it allows licensees and sublicensees of Oracle's GPL2 OpenJDK Code to
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23 build an executable that includes those portions of necessary code that Oracle
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24 could not provide under GPL2 (or that Oracle has provided under GPL2 with the
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25 Classpath exception). If you modify or add to the OpenJDK code, that new
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26 GPL2 code may still be combined with Designated Exception Modules if the
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27 new code is made subject to this exception by its copyright holder.