S390: Migrate watch areas from list to VEC type

[deliverable/binutils-gdb.git] / gdb / event-loop.c

diff --git a/gdb/event-loop.c b/gdb/event-loop.c
index b1f3dd81a23748c51fb023ffb5978ceeb15ee6cd..f94a6fa135f579cf0cdaf2920d3f663ce1dfcf4b 100644 (file)
--- a/gdb/event-loop.c
+++ b/gdb/event-loop.c
@@ -1,5 +1,5 @@
 /* Event loop machinery for GDB, the GNU debugger.
-   Copyright (C) 1999-2015 Free Software Foundation, Inc.
+   Copyright (C) 1999-2016 Free Software Foundation, Inc.
    Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
 
    This file is part of GDB.
@@ -21,6 +21,7 @@
 #include "event-loop.h"
 #include "event-top.h"
 #include "queue.h"
+#include "ser-event.h"
 
 #ifdef HAVE_POLL
 #if defined (HAVE_POLL_H)
@@ -34,6 +35,7 @@
 #include "gdb_sys_time.h"
 #include "gdb_select.h"
 #include "observer.h"
+#include "top.h"
 
 /* Tell create_file_handler what events we are interested in.
    This is used by the select version of the event loop.  */
@@ -262,6 +264,28 @@ static int update_wait_timeout (void);
 static int poll_timers (void);
 \f
 
+/* This event is signalled whenever an asynchronous handler needs to
+   defer an action to the event loop.  */
+static struct serial_event *async_signal_handlers_serial_event;
+
+/* Callback registered with ASYNC_SIGNAL_HANDLERS_SERIAL_EVENT.  */
+
+static void
+async_signals_handler (int error, gdb_client_data client_data)
+{
+  /* Do nothing.  Handlers are run by invoke_async_signal_handlers
+     from instead.  */
+}
+
+void
+initialize_async_signal_handlers (void)
+{
+  async_signal_handlers_serial_event = make_serial_event ();
+
+  add_file_handler (serial_event_fd (async_signal_handlers_serial_event),
+                   async_signals_handler, NULL);
+}
+
 /* Process one high level event.  If nothing is ready at this time,
    wait for something to happen (via gdb_wait_for_event), then process
    it.  Returns >0 if something was done otherwise returns <0 (this
@@ -357,6 +381,7 @@ start_event_loop (void)
          /* If we long-jumped out of do_one_event, we probably didn't
             get around to resetting the prompt, which leaves readline
             in a messed-up state.  Reset it here.  */
+         current_ui->prompt_state = PROMPT_NEEDED;
          observer_notify_command_error ();
          /* This call looks bizarre, but it is required.  If the user
             entered a command that caused an error,
@@ -888,15 +913,6 @@ create_async_signal_handler (sig_handler_func * proc,
   return async_handler_ptr;
 }
 
-/* Call the handler from HANDLER immediately.  This function runs
-   signal handlers when returning to the event loop would be too
-   slow.  */
-void
-call_async_signal_handler (struct async_signal_handler *handler)
-{
-  (*handler->proc) (handler->client_data);
-}
-
 /* Mark the handler (ASYNC_HANDLER_PTR) as ready.  This information
    will be used when the handlers are invoked, after we have waited
    for some event.  The caller of this function is the interrupt
@@ -905,6 +921,7 @@ void
 mark_async_signal_handler (async_signal_handler * async_handler_ptr)
 {
   async_handler_ptr->ready = 1;
+  serial_event_set (async_signal_handlers_serial_event);
 }
 
 /* See event-loop.h.  */
@@ -925,13 +942,19 @@ async_signal_handler_is_marked (async_signal_handler *async_handler_ptr)
 
 /* Call all the handlers that are ready.  Returns true if any was
    indeed ready.  */
+
 static int
 invoke_async_signal_handlers (void)
 {
   async_signal_handler *async_handler_ptr;
   int any_ready = 0;
 
-  /* Invoke ready handlers.  */
+  /* We're going to handle all pending signals, so no need to wake up
+     the event loop again the next time around.  Note this must be
+     cleared _before_ calling the callbacks, to avoid races.  */
+  serial_event_clear (async_signal_handlers_serial_event);
+
+  /* Invoke all ready handlers.  */
 
   while (1)
     {
@@ -946,6 +969,9 @@ invoke_async_signal_handlers (void)
        break;
       any_ready = 1;
       async_handler_ptr->ready = 0;
+      /* Async signal handlers have no connection to whichever was the
+        current UI, and thus always run on the main one.  */
+      current_ui = main_ui;
       (*async_handler_ptr->proc) (async_handler_ptr->client_data);
     }