--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/debugger/ThreadProxy.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2000-2002 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+package sun.jvm.hotspot.debugger;
+
+/** <P> This interface abstracts raw access to operating system-level
+    threads. In a debugging environment these methods map to, for
+    example, thread_db calls on Solaris (see /usr/include/thread_db.h)
+    or the Win32 debugging API calls. In a runtime environment these
+    might map directly to pthread calls. </P>
+
+    <P> Implementors of this interface must provide equals() and
+    hashCode() methods which work properly regardless of how the
+    ThreadProxy is obtained, in particular either through {@link
+    sun.jvm.hotspot.debugger.ThreadAccess} or the thread list provided
+    by {@link sun.jvm.hotspot.debugger.cdbg.CDebugger}. This allows
+    matching up of the OS's notion of the thread list of the target
+    process with any user-level lists that may be present (i.e., the
+    JavaThread list in the HotSpot VM). </P>
+
+    <P> Implementors of this interface should also provide a
+    toString() which converts the ThreadProxy to a value easily
+    recognizable in the platform's debugger. (For example, on Solaris,
+    "t@&lt;id&gt;".) </P>
+
+    <P> FIXME: had to be renamed from "Thread" to avoid numerous
+    clashes with java.lang.Thread -- would be nice to pick a more
+    consistent name with the rest of the system. </P> */
+
+public interface ThreadProxy {
+  /** Retrieves the context for the given thread. It is only valid to
+      call this method if the thread is suspended (i.e., the process
+      has not been resumed via ProcessControl); throws an
+      IllegalThreadStateException if it is not. */
+  public ThreadContext getContext() throws IllegalThreadStateException;
+
+  /** Indicates whether calls to setContext() are valid. */
+  public boolean canSetContext() throws DebuggerException;
+
+  /** Sets the context for the given thread. The passed ThreadContext
+      must be a modified version of one returned from a previous call
+      to getContext(). It is only valid to call this method if the
+      thread is suspended (i.e., the process has not been resumed via
+      ProcessControl); throws an IllegalThreadStateException if it is
+      not. Throws a DebuggerException if the target process can not be
+      modified, for example because it is a core file. */
+  public void setContext(ThreadContext context)
+    throws IllegalThreadStateException, DebuggerException;
+}