[8/9] Share Windows thread-suspend and -resume code

Message ID 20191014161520.13150-9-tromey@adacore.com
State New
Headers show
Series
  • share some Windows code between gdb and gdbserver
Related show

Commit Message

Tom Tromey Oct. 14, 2019, 4:15 p.m.
This adds "suspend" and "resume" methods to windows_thread_info, and
changes gdb and gdbserver to share this code.

2019-10-14  Tom Tromey  <tromey@adacore.com>

	* windows-nat.c (thread_rec): Use windows_thread_info::suspend.
	(windows_continue): Use windows_continue::resume.
	* nat/windows-nat.h (struct windows_thread_info) <suspend,
	resume>: Declare new methods.
	* nat/windows-nat.c: New file.
	* configure.nat (NATDEPFILES): Add nat/windows-nat.o when needed.

gdb/gdbserver/ChangeLog
2019-10-14  Tom Tromey  <tromey@adacore.com>

	* win32-low.c (win32_require_context, suspend_one_thread): Use
	windows_thread_info::suspend.
	(continue_one_thread): Use windows_thread_info::resume.
	* configure.srv (srv_tgtobj): Add windows-nat.o when needed.
---
 gdb/ChangeLog               |  9 ++++++
 gdb/configure.nat           |  4 +--
 gdb/gdbserver/ChangeLog     |  7 +++++
 gdb/gdbserver/configure.srv | 12 ++++----
 gdb/gdbserver/win32-low.c   | 33 ++------------------
 gdb/nat/windows-nat.c       | 60 +++++++++++++++++++++++++++++++++++++
 gdb/nat/windows-nat.h       |  9 ++++++
 gdb/windows-nat.c           | 26 ++--------------
 8 files changed, 98 insertions(+), 62 deletions(-)
 create mode 100644 gdb/nat/windows-nat.c

-- 
2.20.1

Patch

diff --git a/gdb/configure.nat b/gdb/configure.nat
index 77a2ee80839..15390e3309c 100644
--- a/gdb/configure.nat
+++ b/gdb/configure.nat
@@ -75,10 +75,10 @@  case ${gdb_host} in
 	NATDEPFILES='fork-child.o nat/fork-inferior.o inf-ptrace.o'
 	;;
     cygwin*)
-	NATDEPFILES='x86-nat.o nat/x86-dregs.o windows-nat.o'
+	NATDEPFILES='x86-nat.o nat/x86-dregs.o windows-nat.o nat/windows-nat.o'
 	;;
     mingw*)
-	NATDEPFILES='x86-nat.o nat/x86-dregs.o windows-nat.o'
+	NATDEPFILES='x86-nat.o nat/x86-dregs.o windows-nat.o nat/windows-nat.o'
 	;;
     aix)
 	NATDEPFILES='nat/fork-inferior.o fork-child.o inf-ptrace.o'
diff --git a/gdb/gdbserver/configure.srv b/gdb/gdbserver/configure.srv
index 1a4ab8e3361..404ed118061 100644
--- a/gdb/gdbserver/configure.srv
+++ b/gdb/gdbserver/configure.srv
@@ -63,7 +63,7 @@  case "${target}" in
 			srv_linux_thread_db=yes
 			;;
   arm*-*-mingw32ce*)	srv_regobj=reg-arm.o
-			srv_tgtobj="win32-low.o win32-arm-low.o"
+			srv_tgtobj="win32-low.o windows-nat.o win32-arm-low.o"
 			srv_tgtobj="${srv_tgtobj} wincecompat.o"
 			# hostio_last_error implementation is in win32-low.c
 			srv_hostio_err_objs=""
@@ -86,7 +86,7 @@  case "${target}" in
 			srv_linux_thread_db=yes
 			;;
   i[34567]86-*-cygwin*)	srv_regobj=""
-			srv_tgtobj="x86-low.o x86-dregs.o win32-low.o win32-i386-low.o"
+			srv_tgtobj="x86-low.o x86-dregs.o win32-low.o windows-nat.o win32-i386-low.o"
 			srv_tgtobj="${srv_tgtobj} arch/i386.o"
 			;;
   i[34567]86-*-linux*)	srv_tgtobj="${srv_tgtobj} arch/i386.o"
@@ -108,7 +108,7 @@  case "${target}" in
 			;;
   i[34567]86-*-mingw32ce*)
 			srv_regobj=""
-			srv_tgtobj="x86-low.o x86-dregs.o win32-low.o win32-i386-low.o"
+			srv_tgtobj="x86-low.o x86-dregs.o win32-low.o windows-nat.o win32-i386-low.o"
 			srv_tgtobj="${srv_tgtobj} arch/i386.o"
 			srv_tgtobj="${srv_tgtobj} wincecompat.o"
 			# hostio_last_error implementation is in win32-low.c
@@ -117,7 +117,7 @@  case "${target}" in
 			srv_mingwce=yes
 			;;
   i[34567]86-*-mingw*)	srv_regobj=""
-			srv_tgtobj="x86-low.o x86-dregs.o win32-low.o win32-i386-low.o"
+			srv_tgtobj="x86-low.o x86-dregs.o win32-low.o windows-nat.o win32-i386-low.o"
 			srv_tgtobj="${srv_tgtobj} arch/i386.o"
 			srv_mingw=yes
 			;;
@@ -364,12 +364,12 @@  case "${target}" in
 			ipa_obj="${ipa_obj} arch/amd64-ipa.o"
 			;;
   x86_64-*-mingw*)	srv_regobj=""
-			srv_tgtobj="x86-low.o x86-dregs.o i387-fp.o win32-low.o win32-i386-low.o"
+			srv_tgtobj="x86-low.o x86-dregs.o i387-fp.o win32-low.o windows-nat.o win32-i386-low.o"
 			srv_tgtobj="${srv_tgtobj} arch/amd64.o"
 			srv_mingw=yes
 			;;
   x86_64-*-cygwin*)	srv_regobj=""
-			srv_tgtobj="x86-low.o x86-dregs.o i387-fp.o win32-low.o win32-i386-low.o"
+			srv_tgtobj="x86-low.o x86-dregs.o i387-fp.o win32-low.o windows-nat.o win32-i386-low.o"
 			srv_tgtobj="${srv_tgtobj} arch/amd64.o"
 			;;
 
diff --git a/gdb/gdbserver/win32-low.c b/gdb/gdbserver/win32-low.c
index b478d970b5f..7ccf7c18ffc 100644
--- a/gdb/gdbserver/win32-low.c
+++ b/gdb/gdbserver/win32-low.c
@@ -172,18 +172,7 @@  win32_require_context (windows_thread_info *th)
 {
   if (th->context.ContextFlags == 0)
     {
-      if (!th->suspended)
-	{
-	  if (SuspendThread (th->h) == (DWORD) -1)
-	    {
-	      DWORD err = GetLastError ();
-	      OUTMSG (("warning: SuspendThread failed in thread_rec, "
-		       "(error %d): %s\n", (int) err, strwinerror (err)));
-	    }
-	  else
-	    th->suspended = 1;
-	}
-
+      th->suspend ();
       win32_get_thread_context (th);
     }
 }
@@ -436,13 +425,7 @@  continue_one_thread (thread_info *thread, int thread_id)
 	      th->context.ContextFlags = 0;
 	    }
 
-	  if (ResumeThread (th->h) == (DWORD) -1)
-	    {
-	      DWORD err = GetLastError ();
-	      OUTMSG (("warning: ResumeThread failed in continue_one_thread, "
-		       "(error %d): %s\n", (int) err, strwinerror (err)));
-	    }
-	  th->suspended = 0;
+	  th->resume ();
 	}
     }
 }
@@ -1334,17 +1317,7 @@  suspend_one_thread (thread_info *thread)
 {
   windows_thread_info *th = (windows_thread_info *) thread_target_data (thread);
 
-  if (!th->suspended)
-    {
-      if (SuspendThread (th->h) == (DWORD) -1)
-	{
-	  DWORD err = GetLastError ();
-	  OUTMSG (("warning: SuspendThread failed in suspend_one_thread, "
-		   "(error %d): %s\n", (int) err, strwinerror (err)));
-	}
-      else
-	th->suspended = 1;
-    }
+  th->suspend ();
 }
 
 static void
diff --git a/gdb/nat/windows-nat.c b/gdb/nat/windows-nat.c
new file mode 100644
index 00000000000..a98ff421e6f
--- /dev/null
+++ b/gdb/nat/windows-nat.c
@@ -0,0 +1,60 @@ 
+/* Internal interfaces for the Windows code
+   Copyright (C) 1995-2019 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/>.  */
+
+#include "gdbsupport/common-defs.h"
+#include "nat/windows-nat.h"
+
+void
+windows_thread_info::suspend ()
+{
+  if (suspended != 0)
+    return;
+
+  if (SuspendThread (h) == (DWORD) -1)
+    {
+      DWORD err = GetLastError ();
+
+      /* We get Access Denied (5) when trying to suspend
+	 threads that Windows started on behalf of the
+	 debuggee, usually when those threads are just
+	 about to exit.
+	 We can get Invalid Handle (6) if the main thread
+	 has exited.  */
+      if (err != ERROR_INVALID_HANDLE && err != ERROR_ACCESS_DENIED)
+	warning (_("SuspendThread (tid=0x%x) failed. (winerr %u)"),
+		 (unsigned) tid, (unsigned) err);
+      suspended = -1;
+    }
+  else
+    suspended = 1;
+}
+
+void
+windows_thread_info::resume ()
+{
+  if (suspended > 0)
+    {
+      if (ResumeThread (h) == (DWORD) -1)
+	{
+	  DWORD err = GetLastError ();
+	  warning (_("warning: ResumeThread (tid=0x%x) failed. (winerr %u)"),
+		   (unsigned) tid, (unsigned) err);
+	}
+    }
+  suspended = 0;
+}
diff --git a/gdb/nat/windows-nat.h b/gdb/nat/windows-nat.h
index 06c6486c0c0..b51279b65c9 100644
--- a/gdb/nat/windows-nat.h
+++ b/gdb/nat/windows-nat.h
@@ -19,6 +19,8 @@ 
 #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
@@ -32,6 +34,13 @@  struct windows_thread_info
 
   DISABLE_COPY_AND_ASSIGN (windows_thread_info);
 
+  /* Ensure that this thread has been suspended.  */
+  void suspend ();
+
+  /* Resume the thread if it has been suspended.  */
+  void resume ();
+
+
   /* The Win32 thread identifier.  */
   DWORD tid;
 
diff --git a/gdb/windows-nat.c b/gdb/windows-nat.c
index 3a526e504e4..e6a97f8b8c3 100644
--- a/gdb/windows-nat.c
+++ b/gdb/windows-nat.c
@@ -377,27 +377,7 @@  thread_rec (DWORD id, int get_context)
 	if (!th->suspended && get_context)
 	  {
 	    if (get_context > 0 && id != current_event.dwThreadId)
-	      {
-		if (SuspendThread (th->h) == (DWORD) -1)
-		  {
-		    DWORD err = GetLastError ();
-
-		    /* We get Access Denied (5) when trying to suspend
-		       threads that Windows started on behalf of the
-		       debuggee, usually when those threads are just
-		       about to exit.
-		       We can get Invalid Handle (6) if the main thread
-		       has exited.  */
-		    if (err != ERROR_INVALID_HANDLE
-			&& err != ERROR_ACCESS_DENIED)
-		      warning (_("SuspendThread (tid=0x%x) failed."
-				 " (winerr %u)"),
-			       (unsigned) id, (unsigned) err);
-		    th->suspended = -1;
-		  }
-		else
-		  th->suspended = 1;
-	      }
+	      th->suspend ();
 	    else if (get_context < 0)
 	      th->suspended = -1;
 	    th->reload_context = true;
@@ -1329,9 +1309,7 @@  windows_continue (DWORD continue_status, int id, int killed)
 	      }
 	    th->context.ContextFlags = 0;
 	  }
-	if (th->suspended > 0)
-	  (void) ResumeThread (th->h);
-	th->suspended = 0;
+	th->resume ();
       }
 
   res = ContinueDebugEvent (current_event.dwProcessId,