--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/debugger/cdbg/ProcessControl.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,115 @@
+/*
+ * Copyright 2001 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.cdbg;
+
+import sun.jvm.hotspot.debugger.*;
+
+/** <P> A highly experimental interface for process control and debug
+    events. May not be sufficiently portable; for this reason it has
+    been factored out from the CDebugger interface and support for it
+    is optional. </P>
+
+    <P> The ProcessControl interface defines a process control and
+    event model for debugging. When a process is attached to by the
+    base Debugger, all threads in the target process are suspended.
+    The ProcessControl interface allows resumption and re-suspension
+    of the threads in the target process, setting of breakpoints, and
+    reception of debugging events (breakpoint hit, signal received,
+    etc.). </P>
+
+    <P> Debugging events are generated one at a time by the target
+    process. They must be queued up by the underlying debugging
+    mechanism so that an attempt to send a second debugging event
+    blocks until the first has been serviced with a call to
+    debugEventResume. </P> */
+
+public interface ProcessControl {
+  /** Suspends all threads in the target process. A process is already
+      suspended when attached to by {@link
+      sun.jvm.hotspot.debugger.Debugger.attach(int)}. The application
+      should check for the presence of a debug event via
+      debugEventPoll() upon re-suspending the target process (if one
+      is not yet known to be present.)
+
+      @throw DebuggerException if the process is already suspended or
+      if the suspension failed for some other reason. */
+  public void suspend() throws DebuggerException;
+
+  /** Resumes all threads in the target process.
+
+      @throw DebuggerException if the process is not suspended or if
+      the resumption failed for some other reason. */
+  public void resume() throws DebuggerException;
+
+  /** Indicates whether the target process is suspended. */
+  public boolean isSuspended() throws DebuggerException;
+
+  /** Sets a breakpoint at the given address. The target process must
+      be suspended in order to set a breakpoint.
+
+      @throw DebuggerException if the breakpoint could not be set for
+      some reason, including that a breakpoint is already set at that
+      address or that the underlying debugging mechanism does not
+      support that many breakpoints. */
+  public void setBreakpoint(Address addr)
+    throws UnmappedAddressException, DebuggerException;
+
+  /** Clears a breakpoint at the given address. The target process
+      must be suspended in order to clear a breakpoint.
+
+      @throw DebuggerException if the breakpoint could not be cleared
+      for some reason, including that there was no breakpoint at that
+      address. */
+  public void clearBreakpoint(Address addr) throws DebuggerException;
+
+  /** Indicates whether a breakpoint is set at the given address. */
+  public boolean isBreakpointSet(Address addr) throws DebuggerException;
+
+  /** Polls for the presence of a debug event. Does not wait for one
+      to be generated; returns null if none was pending. The target
+      process does not need to be suspended. Returns the same
+      DebugEvent object until the debug event is handled via
+      debugEventContinue. Typically the application will suspend the
+      target process upon reception of a debug event but before
+      handling it via a call to debugEventContinue. This ensures that
+      the state of the thread which generated the debug event is
+      precisely what it was when the event was generated.
+
+      @return The pending debug event, or null if none pending. */
+  public DebugEvent debugEventPoll() throws DebuggerException;
+
+  /** Informs the target process to resume past this debug event. The
+      target process does not need to be suspended. Breakpoint debug
+      events must be handled transparently by the implementation to
+      re-execute the instruction and replace the breakpoint. (Ideally
+      they should be replaced in such a way that there is no race
+      condition between the re-execution and the re-insertion of the
+      breakpoint.) All other kinds of exceptions or signals are passed
+      on to the target process.
+
+      @throw DebuggerException if no debug event is pending. */
+  public void debugEventContinue()
+    throws DebuggerException;
+}