Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/debugger/ThreadAccess.java @ 3945:8ed53447f690
Merge
author | iveresov |
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date | Thu, 15 Sep 2011 12:44:09 -0700 |
parents | c18cbe5936b8 |
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/* * Copyright (c) 2000, 2003, 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.debugger; /** <P> This interface abstracts over access to operating system-level threads in the underlying process. It is designed to be minimal and generic to allow cross-platform compatibility. </P> <P> The basic operation this interface supports is creating a sun.jvm.hotspot.debugger.ThreadProxy "token" for an existing thread. As an example, the HotSpot VM contains a list of Java threads, encapsulated in VM-specific JavaThread objects. Each of these contains a platform-dependent field with the OS-level thread identifier; on Solaris, this field's type is "thread_t", while on Windows, it is HANDLE. It is necessary to be able to map from these fields to a ThreadProxy object, in particular to be able to get the thread's context. However, since the types of these fields vary greatly from OS to OS (some use integers as thread IDs, some use pointers as thread handles) it is not possible to define one particular type (Address, long) in this interface as the lookup "key" for a Thread. </P> <P> For this reason this mapping mechanism takes the Address of the memory location containing the thread identifier. On Solaris, this is the address of a location containing a thread_t; on Windows, this is the address of a location containing a HANDLE for a thread. On Linux, this is the address of a location containing a pthread_t.</P> <P> The {@link sun.jvm.hotspot.debugger.cdbg.CDebugger} interface provides access to the entire thread list of the target process, but this is optional functionality not required to get the SA to work. </P> */ public interface ThreadAccess { /** Gets an abstract ThreadProxy object for the thread identified by the contents of the memory location pointed to by addr. The contents at location addr are inherently platform-dependent; see the documentation for this class for more information. FIXME: what exception, if any, should this throw? */ public ThreadProxy getThreadForIdentifierAddress(Address addr); /** Gets an abstract ThreadProxy object for the thread identified by id or handle that is platform dependent */ public ThreadProxy getThreadForThreadId(long id); }