gdb/nat/windows-nat.c

   1 /* Internal interfaces for the Windows code
   2    Copyright (C) 1995-2019 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include "gdbsupport/common-defs.h"
  20 #include "nat/windows-nat.h"
  21
  22 windows_thread_info::~windows_thread_info ()
  23 {
  24   CloseHandle (h);
  25 }
  26
  27 void
  28 windows_thread_info::suspend ()
  29 {
  30   if (suspended != 0)
  31     return;
  32
  33   if (SuspendThread (h) == (DWORD) -1)
  34     {
  35       DWORD err = GetLastError ();
  36
  37       /* We get Access Denied (5) when trying to suspend
  38          threads that Windows started on behalf of the
  39          debuggee, usually when those threads are just
  40          about to exit.
  41          We can get Invalid Handle (6) if the main thread
  42          has exited.  */
  43       if (err != ERROR_INVALID_HANDLE && err != ERROR_ACCESS_DENIED)
  44         warning (_("SuspendThread (tid=0x%x) failed. (winerr %u)"),
  45                  (unsigned) tid, (unsigned) err);
  46       suspended = -1;
  47     }
  48   else
  49     suspended = 1;
  50 }
  51
  52 void
  53 windows_thread_info::resume ()
  54 {
  55   if (suspended > 0)
  56     {
  57       stopped_at_software_breakpoint = false;
  58
  59       if (ResumeThread (h) == (DWORD) -1)
  60         {
  61           DWORD err = GetLastError ();
  62           warning (_("warning: ResumeThread (tid=0x%x) failed. (winerr %u)"),
  63                    (unsigned) tid, (unsigned) err);
  64         }
  65     }
  66   suspended = 0;
  67 }