Share windows_thread_info between gdb and gdbserver

This introduces a new file, nat/windows-nat.h, which holds the
definition of windows_thread_info.  This is now shared between gdb and
gdbserver.

Note that the two implementations different slightly.  gdb had a
couple of fields ("name" and "reload_context") that gdbserver did not;
while gdbserver had one field ("base_context") that gdb did not, plus
better comments.  The new file preserves all the fields, and the
comments.

gdb/ChangeLog
2020-04-08  Tom Tromey  <tromey@adacore.com>

	* windows-nat.c (struct windows_thread_info): Remove.
	* nat/windows-nat.h: New file.

gdbserver/ChangeLog
2020-04-08  Tom Tromey  <tromey@adacore.com>

	* win32-low.h (struct windows_thread_info): Remove.

1 files changed, 66 insertions, 0 deletions

diff --git a/gdb/nat/windows-nat.h b/gdb/nat/windows-nat.h
new file mode 100644
index 0000000..71df097
--- /dev/null
+++ b/gdb/nat/windows-nat.h
@@ -0,0 +1,66 @@
+/* Internal interfaces for the Windows code
+   Copyright (C) 1995-2020 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef NAT_WINDOWS_NAT_H
+#define NAT_WINDOWS_NAT_H
+
+#include <windows.h>
+
+/* Thread information structure used to track extra information about
+   each thread.  */
+struct windows_thread_info
+{
+  /* The Win32 thread identifier.  */
+  DWORD tid;
+
+  /* The handle to the thread.  */
+  HANDLE h;
+
+  /* Thread Information Block address.  */
+  CORE_ADDR thread_local_base;
+
+  /* Non zero if SuspendThread was called on this thread.  */
+  int suspended;
+
+#ifdef _WIN32_WCE
+  /* The context as retrieved right after suspending the thread. */
+  CONTEXT base_context;
+#endif
+
+  /* The context of the thread, including any manipulations.  */
+  union
+  {
+    CONTEXT context;
+#ifdef __x86_64__
+    WOW64_CONTEXT wow64_context;
+#endif
+  };
+
+  /* Whether debug registers changed since we last set CONTEXT back to
+     the thread.  */
+  int debug_registers_changed;
+
+  /* Nonzero if CONTEXT is invalidated and must be re-read from the
+     inferior thread.  */
+  int reload_context;
+
+  /* The name of the thread, allocated by xmalloc.  */
+  char *name;
+};
+
+#endif