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comparison agent/src/share/classes/sun/jvm/hotspot/debugger/ThreadAccess.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 2000-2003 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.debugger;
26
27 /** <P> This interface abstracts over access to operating system-level
28 threads in the underlying process. It is designed to be minimal
29 and generic to allow cross-platform compatibility. </P>
30
31 <P> The basic operation this interface supports is creating a
32 sun.jvm.hotspot.debugger.ThreadProxy "token" for an existing
33 thread. As an example, the HotSpot VM contains a list of Java
34 threads, encapsulated in VM-specific JavaThread objects. Each of
35 these contains a platform-dependent field with the OS-level thread
36 identifier; on Solaris, this field's type is "thread_t", while on
37 Windows, it is HANDLE. It is necessary to be able to map from
38 these fields to a ThreadProxy object, in particular to be able to
39 get the thread's context. However, since the types of these fields
40 vary greatly from OS to OS (some use integers as thread IDs, some
41 use pointers as thread handles) it is not possible to define one
42 particular type (Address, long) in this interface as the lookup
43 "key" for a Thread. </P>
44
45 <P> For this reason this mapping mechanism takes the Address of
46 the memory location containing the thread identifier. On Solaris,
47 this is the address of a location containing a thread_t; on
48 Windows, this is the address of a location containing a HANDLE for
49 a thread. On Linux, this is the address of a location containing a
50 pthread_t.</P>
51
52 <P> The {@link sun.jvm.hotspot.debugger.cdbg.CDebugger} interface
53 provides access to the entire thread list of the target process,
54 but this is optional functionality not required to get the SA to
55 work. </P> */
56
57 public interface ThreadAccess {
58 /** Gets an abstract ThreadProxy object for the thread identified by
59 the contents of the memory location pointed to by addr. The
60 contents at location addr are inherently platform-dependent; see
61 the documentation for this class for more information. FIXME:
62 what exception, if any, should this throw? */
63 public ThreadProxy getThreadForIdentifierAddress(Address addr);
64
65 /** Gets an abstract ThreadProxy object for the thread identified by
66 id or handle that is platform dependent */
67 public ThreadProxy getThreadForThreadId(long id);
68 }