Cygwin: pty: Add still missing acquire/release_attach_mutex.

- transfer_input() function uses console api, so it should be guarded
  by attach_mutex. However, in most cases, it is missing. This patch
  fixes the issue.

winsup/cygwin/fhandler_tty.cc

@@ -1133,8 +1133,10 @@ fhandler_pty_slave::reset_switch_to_nat_pipe (void)
 		  && get_ttyp ()->pty_input_state_eq (tty::to_nat))
 		{
 		  WaitForSingleObject (input_mutex, mutex_timeout);
+		  acquire_attach_mutex (mutex_timeout);
 		  transfer_input (tty::to_cyg, get_handle_nat (), get_ttyp (),
 				  input_available_event);
+		  release_attach_mutex ();
 		  ReleaseMutex (input_mutex);
 		}
 	      if (get_ttyp ()->master_is_running_as_service
@@ -1237,8 +1239,10 @@ fhandler_pty_slave::reset_switch_to_nat_pipe (void)
 		   && get_ttyp ()->switch_to_nat_pipe)
 	    {
 	      WaitForSingleObject (input_mutex, mutex_timeout);
+	      acquire_attach_mutex (mutex_timeout);
 	      transfer_input (tty::to_cyg, get_handle_nat (), get_ttyp (),
 			      input_available_event);
+	      release_attach_mutex ();
 	      ReleaseMutex (input_mutex);
 	    }
 	}
@@ -1250,8 +1254,12 @@ fhandler_pty_slave::reset_switch_to_nat_pipe (void)
   WaitForSingleObject (input_mutex, mutex_timeout);
   if (get_ttyp ()->switch_to_nat_pipe && !get_ttyp ()->pcon_activated
       && get_ttyp ()->pty_input_state_eq (tty::to_nat))
-    transfer_input (tty::to_cyg, get_handle_nat (), get_ttyp (),
+    {
-		    input_available_event);
+      acquire_attach_mutex (mutex_timeout);
+      transfer_input (tty::to_cyg, get_handle_nat (), get_ttyp (),
+		      input_available_event);
+      release_attach_mutex ();
+    }
   ReleaseMutex (input_mutex);
   /* Clean up nat pipe state */
   get_ttyp ()->pty_input_state = tty::to_cyg;
@@ -1333,11 +1341,19 @@ fhandler_pty_slave::mask_switch_to_nat_pipe (bool mask, bool xfer)
   if (!!masked != mask && xfer && (need_gdb_xfer || need_xfer))
     {
       if (mask && get_ttyp ()->pty_input_state_eq (tty::to_nat))
-	transfer_input (tty::to_cyg, get_handle_nat (), get_ttyp (),
+	{
-			input_available_event);
+	  acquire_attach_mutex (mutex_timeout);
+	  transfer_input (tty::to_cyg, get_handle_nat (), get_ttyp (),
+			  input_available_event);
+	  release_attach_mutex ();
+	}
       else if (!mask && get_ttyp ()->pty_input_state_eq (tty::to_cyg))
-	transfer_input (tty::to_nat, get_handle (), get_ttyp (),
+	{
-			input_available_event);
+	  acquire_attach_mutex (mutex_timeout);
+	  transfer_input (tty::to_nat, get_handle (), get_ttyp (),
+			  input_available_event);
+	  release_attach_mutex ();
+	}
     }
   ReleaseMutex (input_mutex);
 }
@@ -2261,9 +2277,11 @@ fhandler_pty_master::write (const void *ptr, size_t len)
 	      if (get_readahead_valid ())
 		accept_input ();
 	      WaitForSingleObject (input_mutex, mutex_timeout);
+	      acquire_attach_mutex (mutex_timeout);
 	      fhandler_pty_slave::transfer_input (tty::to_nat, from_master,
 						  get_ttyp (),
 						  input_available_event);
+	      release_attach_mutex ();
 	      ReleaseMutex (input_mutex);
 	    }
 	  get_ttyp ()->pcon_start_pid = 0;
@@ -2315,8 +2333,12 @@ fhandler_pty_master::write (const void *ptr, size_t len)
      non-cygwin app is terminated if pseudo console is disabled. */
   if (to_be_read_from_nat_pipe () && !get_ttyp ()->pcon_activated
       && get_ttyp ()->pty_input_state == tty::to_cyg)
-    fhandler_pty_slave::transfer_input (tty::to_nat, from_master,
+    {
-					get_ttyp (), input_available_event);
+      acquire_attach_mutex (mutex_timeout);
+      fhandler_pty_slave::transfer_input (tty::to_nat, from_master,
+					  get_ttyp (), input_available_event);
+      release_attach_mutex ();
+    }
   ReleaseMutex (input_mutex);
 
   line_edit_status status = line_edit (p, len, ti, &ret);
@@ -4038,8 +4060,10 @@ fhandler_pty_slave::setup_for_non_cygwin_app (bool nopcon, PWCHAR envblock,
       && stdin_is_ptys && get_ttyp ()->pty_input_state_eq (tty::to_cyg))
     {
       WaitForSingleObject (input_mutex, mutex_timeout);
+      acquire_attach_mutex (mutex_timeout);
       transfer_input (tty::to_nat, get_handle (), get_ttyp (),
 		      input_available_event);
+      release_attach_mutex ();
       ReleaseMutex (input_mutex);
     }
 }
@@ -4054,8 +4078,10 @@ fhandler_pty_slave::cleanup_for_non_cygwin_app (handle_set_t *p, tty *ttyp,
       && ttyp->pty_input_state_eq (tty::to_nat))
     {
       WaitForSingleObject (p->input_mutex, mutex_timeout);
+      acquire_attach_mutex (mutex_timeout);
       transfer_input (tty::to_cyg, p->from_master_nat, ttyp,
 		      p->input_available_event);
+      release_attach_mutex ();
       ReleaseMutex (p->input_mutex);
     }
   WaitForSingleObject (p->pipe_sw_mutex, INFINITE);
@@ -4080,8 +4106,10 @@ fhandler_pty_slave::setpgid_aux (pid_t pid)
       && get_ttyp ()->pty_input_state_eq (tty::to_cyg))
     {
       WaitForSingleObject (input_mutex, mutex_timeout);
+      acquire_attach_mutex (mutex_timeout);
       transfer_input (tty::to_nat, get_handle (), get_ttyp (),
 		      input_available_event);
+      release_attach_mutex ();
       ReleaseMutex (input_mutex);
     }
   else if (was_nat_fg && !nat_fg && get_ttyp ()->switch_to_nat_pipe
@@ -4103,11 +4131,15 @@ fhandler_pty_slave::setpgid_aux (pid_t pid)
 	  resume_pid = attach_console_temporarily (target_pid);
 	  attach_restore = true;
 	}
+      else
+	acquire_attach_mutex (mutex_timeout);
       WaitForSingleObject (input_mutex, mutex_timeout);
       transfer_input (tty::to_cyg, from, get_ttyp (), input_available_event);
       ReleaseMutex (input_mutex);
       if (attach_restore)
 	resume_from_temporarily_attach (resume_pid);
+      else
+	release_attach_mutex ();
     }
   ReleaseMutex (pipe_sw_mutex);
 }