| /* |
| * 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 |
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| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
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| */ |
| |
| 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); |
| } |