Mercurial > hg > graal-jvmci-8
annotate agent/src/share/classes/sun/jvm/hotspot/debugger/ThreadAccess.java @ 17524:89152779163c
Merge with jdk8-b132
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Wed, 15 Oct 2014 11:59:32 +0200 |
parents | c18cbe5936b8 |
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2 * Copyright (c) 2000, 2003, Oracle and/or its affiliates. All rights reserved. |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 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 } |