Move event-loop.[ch] to gdbsupport/

This moves event-loop.[ch] to gdbsupport/ and updates the uses in gdb.

gdb/ChangeLog
2020-04-13  Tom Tromey  <tom@tromey.com>

	* run-on-main-thread.c: Update include.
	* unittests/main-thread-selftests.c: Update include.
	* tui/tui-win.c: Update include.
	* tui/tui-io.c: Update include.
	* tui/tui-interp.c: Update include.
	* tui/tui-hooks.c: Update include.
	* top.h: Update include.
	* top.c: Update include.
	* ser-base.c: Update include.
	* remote.c: Update include.
	* remote-notif.c: Update include.
	* remote-fileio.c: Update include.
	* record-full.c: Update include.
	* record-btrace.c: Update include.
	* python/python.c: Update include.
	* posix-hdep.c: Update include.
	* mingw-hdep.c: Update include.
	* mi/mi-main.c: Update include.
	* mi/mi-interp.c: Update include.
	* main.c: Update include.
	* linux-nat.c: Update include.
	* interps.c: Update include.
	* infrun.c: Update include.
	* inf-loop.c: Update include.
	* event-top.c: Update include.
	* event-loop.c: Move to ../gdbsupport/.
	* event-loop.h: Move to ../gdbsupport/.
	* async-event.h: Update include.
	* Makefile.in (COMMON_SFILES, HFILES_NO_SRCDIR): Update.

gdbsupport/ChangeLog
2020-04-13  Tom Tromey  <tom@tromey.com>

	* event-loop.h: Move from ../gdb/.
	* event-loop.cc: Move from ../gdb/.

1 files changed, 0 insertions, 889 deletions

diff --git a/gdb/event-loop.c b/gdb/event-loop.c
deleted file mode 100644
index e5347d2..0000000
--- a/gdb/event-loop.c
+++ /dev/null
@@ -1,889 +0,0 @@
-/* Event loop machinery for GDB, the GNU debugger.
-   Copyright (C) 1999-2020 Free Software Foundation, Inc.
-   Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
-
-   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 "defs.h"
-#include "event-loop.h"
-
-#include <chrono>
-
-#ifdef HAVE_POLL
-#if defined (HAVE_POLL_H)
-#include <poll.h>
-#elif defined (HAVE_SYS_POLL_H)
-#include <sys/poll.h>
-#endif
-#endif
-
-#include <sys/types.h>
-#include "gdbsupport/gdb_sys_time.h"
-#include "gdbsupport/gdb_select.h"
-
-/* Tell create_file_handler what events we are interested in.
-   This is used by the select version of the event loop.  */
-
-#define GDB_READABLE	(1<<1)
-#define GDB_WRITABLE	(1<<2)
-#define GDB_EXCEPTION	(1<<3)
-
-/* Information about each file descriptor we register with the event
-   loop.  */
-
-typedef struct file_handler
-  {
-    int fd;			/* File descriptor.  */
-    int mask;			/* Events we want to monitor: POLLIN, etc.  */
-    int ready_mask;		/* Events that have been seen since
-				   the last time.  */
-    handler_func *proc;		/* Procedure to call when fd is ready.  */
-    gdb_client_data client_data;	/* Argument to pass to proc.  */
-    int error;			/* Was an error detected on this fd?  */
-    struct file_handler *next_file;	/* Next registered file descriptor.  */
-  }
-file_handler;
-
-/* Gdb_notifier is just a list of file descriptors gdb is interested in.
-   These are the input file descriptor, and the target file
-   descriptor.  We have two flavors of the notifier, one for platforms
-   that have the POLL function, the other for those that don't, and
-   only support SELECT.  Each of the elements in the gdb_notifier list is
-   basically a description of what kind of events gdb is interested
-   in, for each fd.  */
-
-/* As of 1999-04-30 only the input file descriptor is registered with the
-   event loop.  */
-
-/* Do we use poll or select ? */
-#ifdef HAVE_POLL
-#define USE_POLL 1
-#else
-#define USE_POLL 0
-#endif /* HAVE_POLL */
-
-static unsigned char use_poll = USE_POLL;
-
-#ifdef USE_WIN32API
-#include <windows.h>
-#include <io.h>
-#endif
-
-static struct
-  {
-    /* Ptr to head of file handler list.  */
-    file_handler *first_file_handler;
-
-    /* Next file handler to handle, for the select variant.  To level
-       the fairness across event sources, we serve file handlers in a
-       round-robin-like fashion.  The number and order of the polled
-       file handlers may change between invocations, but this is good
-       enough.  */
-    file_handler *next_file_handler;
-
-#ifdef HAVE_POLL
-    /* Ptr to array of pollfd structures.  */
-    struct pollfd *poll_fds;
-
-    /* Next file descriptor to handle, for the poll variant.  To level
-       the fairness across event sources, we poll the file descriptors
-       in a round-robin-like fashion.  The number and order of the
-       polled file descriptors may change between invocations, but
-       this is good enough.  */
-    int next_poll_fds_index;
-
-    /* Timeout in milliseconds for calls to poll().  */
-    int poll_timeout;
-#endif
-
-    /* Masks to be used in the next call to select.
-       Bits are set in response to calls to create_file_handler.  */
-    fd_set check_masks[3];
-
-    /* What file descriptors were found ready by select.  */
-    fd_set ready_masks[3];
-
-    /* Number of file descriptors to monitor (for poll).  */
-    /* Number of valid bits (highest fd value + 1) (for select).  */
-    int num_fds;
-
-    /* Time structure for calls to select().  */
-    struct timeval select_timeout;
-
-    /* Flag to tell whether the timeout should be used.  */
-    int timeout_valid;
-  }
-gdb_notifier;
-
-/* Structure associated with a timer.  PROC will be executed at the
-   first occasion after WHEN.  */
-struct gdb_timer
-  {
-    std::chrono::steady_clock::time_point when;
-    int timer_id;
-    struct gdb_timer *next;
-    timer_handler_func *proc;	    /* Function to call to do the work.  */
-    gdb_client_data client_data;    /* Argument to async_handler_func.  */
-  };
-
-/* List of currently active timers.  It is sorted in order of
-   increasing timers.  */
-static struct
-  {
-    /* Pointer to first in timer list.  */
-    struct gdb_timer *first_timer;
-
-    /* Id of the last timer created.  */
-    int num_timers;
-  }
-timer_list;
-
-static void create_file_handler (int fd, int mask, handler_func *proc,
-				 gdb_client_data client_data);
-static int gdb_wait_for_event (int);
-static int update_wait_timeout (void);
-static int poll_timers (void);
-
-/* 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
-   can happen if there are no event sources to wait for).  */
-
-int
-gdb_do_one_event (void)
-{
-  static int event_source_head = 0;
-  const int number_of_sources = 3;
-  int current = 0;
-
-  /* First let's see if there are any asynchronous signal handlers
-     that are ready.  These would be the result of invoking any of the
-     signal handlers.  */
-  if (invoke_async_signal_handlers ())
-    return 1;
-
-  /* To level the fairness across event sources, we poll them in a
-     round-robin fashion.  */
-  for (current = 0; current < number_of_sources; current++)
-    {
-      int res;
-
-      switch (event_source_head)
-	{
-	case 0:
-	  /* Are any timers that are ready?  */
-	  res = poll_timers ();
-	  break;
-	case 1:
-	  /* Are there events already waiting to be collected on the
-	     monitored file descriptors?  */
-	  res = gdb_wait_for_event (0);
-	  break;
-	case 2:
-	  /* Are there any asynchronous event handlers ready?  */
-	  res = check_async_event_handlers ();
-	  break;
-	default:
-	  internal_error (__FILE__, __LINE__,
-			  "unexpected event_source_head %d",
-			  event_source_head);
-	}
-
-      event_source_head++;
-      if (event_source_head == number_of_sources)
-	event_source_head = 0;
-
-      if (res > 0)
-	return 1;
-    }
-
-  /* Block waiting for a new event.  If gdb_wait_for_event returns -1,
-     we should get out because this means that there are no event
-     sources left.  This will make the event loop stop, and the
-     application exit.  */
-
-  if (gdb_wait_for_event (1) < 0)
-    return -1;
-
-  /* If gdb_wait_for_event has returned 1, it means that one event has
-     been handled.  We break out of the loop.  */
-  return 1;
-}
-
-
-
-/* Wrapper function for create_file_handler, so that the caller
-   doesn't have to know implementation details about the use of poll
-   vs. select.  */
-void
-add_file_handler (int fd, handler_func * proc, gdb_client_data client_data)
-{
-#ifdef HAVE_POLL
-  struct pollfd fds;
-#endif
-
-  if (use_poll)
-    {
-#ifdef HAVE_POLL
-      /* Check to see if poll () is usable.  If not, we'll switch to
-         use select.  This can happen on systems like
-         m68k-motorola-sys, `poll' cannot be used to wait for `stdin'.
-         On m68k-motorola-sysv, tty's are not stream-based and not
-         `poll'able.  */
-      fds.fd = fd;
-      fds.events = POLLIN;
-      if (poll (&fds, 1, 0) == 1 && (fds.revents & POLLNVAL))
-	use_poll = 0;
-#else
-      internal_error (__FILE__, __LINE__,
-		      _("use_poll without HAVE_POLL"));
-#endif /* HAVE_POLL */
-    }
-  if (use_poll)
-    {
-#ifdef HAVE_POLL
-      create_file_handler (fd, POLLIN, proc, client_data);
-#else
-      internal_error (__FILE__, __LINE__,
-		      _("use_poll without HAVE_POLL"));
-#endif
-    }
-  else
-    create_file_handler (fd, GDB_READABLE | GDB_EXCEPTION, 
-			 proc, client_data);
-}
-
-/* Add a file handler/descriptor to the list of descriptors we are
-   interested in.
-
-   FD is the file descriptor for the file/stream to be listened to.
-
-   For the poll case, MASK is a combination (OR) of POLLIN,
-   POLLRDNORM, POLLRDBAND, POLLPRI, POLLOUT, POLLWRNORM, POLLWRBAND:
-   these are the events we are interested in.  If any of them occurs,
-   proc should be called.
-
-   For the select case, MASK is a combination of READABLE, WRITABLE,
-   EXCEPTION.  PROC is the procedure that will be called when an event
-   occurs for FD.  CLIENT_DATA is the argument to pass to PROC.  */
-
-static void
-create_file_handler (int fd, int mask, handler_func * proc, 
-		     gdb_client_data client_data)
-{
-  file_handler *file_ptr;
-
-  /* Do we already have a file handler for this file?  (We may be
-     changing its associated procedure).  */
-  for (file_ptr = gdb_notifier.first_file_handler; file_ptr != NULL;
-       file_ptr = file_ptr->next_file)
-    {
-      if (file_ptr->fd == fd)
-	break;
-    }
-
-  /* It is a new file descriptor.  Add it to the list.  Otherwise, just
-     change the data associated with it.  */
-  if (file_ptr == NULL)
-    {
-      file_ptr = XNEW (file_handler);
-      file_ptr->fd = fd;
-      file_ptr->ready_mask = 0;
-      file_ptr->next_file = gdb_notifier.first_file_handler;
-      gdb_notifier.first_file_handler = file_ptr;
-
-      if (use_poll)
-	{
-#ifdef HAVE_POLL
-	  gdb_notifier.num_fds++;
-	  if (gdb_notifier.poll_fds)
-	    gdb_notifier.poll_fds =
-	      (struct pollfd *) xrealloc (gdb_notifier.poll_fds,
-					  (gdb_notifier.num_fds
-					   * sizeof (struct pollfd)));
-	  else
-	    gdb_notifier.poll_fds =
-	      XNEW (struct pollfd);
-	  (gdb_notifier.poll_fds + gdb_notifier.num_fds - 1)->fd = fd;
-	  (gdb_notifier.poll_fds + gdb_notifier.num_fds - 1)->events = mask;
-	  (gdb_notifier.poll_fds + gdb_notifier.num_fds - 1)->revents = 0;
-#else
-	  internal_error (__FILE__, __LINE__,
-			  _("use_poll without HAVE_POLL"));
-#endif /* HAVE_POLL */
-	}
-      else
-	{
-	  if (mask & GDB_READABLE)
-	    FD_SET (fd, &gdb_notifier.check_masks[0]);
-	  else
-	    FD_CLR (fd, &gdb_notifier.check_masks[0]);
-
-	  if (mask & GDB_WRITABLE)
-	    FD_SET (fd, &gdb_notifier.check_masks[1]);
-	  else
-	    FD_CLR (fd, &gdb_notifier.check_masks[1]);
-
-	  if (mask & GDB_EXCEPTION)
-	    FD_SET (fd, &gdb_notifier.check_masks[2]);
-	  else
-	    FD_CLR (fd, &gdb_notifier.check_masks[2]);
-
-	  if (gdb_notifier.num_fds <= fd)
-	    gdb_notifier.num_fds = fd + 1;
-	}
-    }
-
-  file_ptr->proc = proc;
-  file_ptr->client_data = client_data;
-  file_ptr->mask = mask;
-}
-
-/* Return the next file handler to handle, and advance to the next
-   file handler, wrapping around if the end of the list is
-   reached.  */
-
-static file_handler *
-get_next_file_handler_to_handle_and_advance (void)
-{
-  file_handler *curr_next;
-
-  /* The first time around, this is still NULL.  */
-  if (gdb_notifier.next_file_handler == NULL)
-    gdb_notifier.next_file_handler = gdb_notifier.first_file_handler;
-
-  curr_next = gdb_notifier.next_file_handler;
-  gdb_assert (curr_next != NULL);
-
-  /* Advance.  */
-  gdb_notifier.next_file_handler = curr_next->next_file;
-  /* Wrap around, if necessary.  */
-  if (gdb_notifier.next_file_handler == NULL)
-    gdb_notifier.next_file_handler = gdb_notifier.first_file_handler;
-
-  return curr_next;
-}
-
-/* Remove the file descriptor FD from the list of monitored fd's: 
-   i.e. we don't care anymore about events on the FD.  */
-void
-delete_file_handler (int fd)
-{
-  file_handler *file_ptr, *prev_ptr = NULL;
-  int i;
-#ifdef HAVE_POLL
-  int j;
-  struct pollfd *new_poll_fds;
-#endif
-
-  /* Find the entry for the given file.  */
-
-  for (file_ptr = gdb_notifier.first_file_handler; file_ptr != NULL;
-       file_ptr = file_ptr->next_file)
-    {
-      if (file_ptr->fd == fd)
-	break;
-    }
-
-  if (file_ptr == NULL)
-    return;
-
-  if (use_poll)
-    {
-#ifdef HAVE_POLL
-      /* Create a new poll_fds array by copying every fd's information
-         but the one we want to get rid of.  */
-
-      new_poll_fds = (struct pollfd *) 
-	xmalloc ((gdb_notifier.num_fds - 1) * sizeof (struct pollfd));
-
-      for (i = 0, j = 0; i < gdb_notifier.num_fds; i++)
-	{
-	  if ((gdb_notifier.poll_fds + i)->fd != fd)
-	    {
-	      (new_poll_fds + j)->fd = (gdb_notifier.poll_fds + i)->fd;
-	      (new_poll_fds + j)->events = (gdb_notifier.poll_fds + i)->events;
-	      (new_poll_fds + j)->revents
-		= (gdb_notifier.poll_fds + i)->revents;
-	      j++;
-	    }
-	}
-      xfree (gdb_notifier.poll_fds);
-      gdb_notifier.poll_fds = new_poll_fds;
-      gdb_notifier.num_fds--;
-#else
-      internal_error (__FILE__, __LINE__,
-		      _("use_poll without HAVE_POLL"));
-#endif /* HAVE_POLL */
-    }
-  else
-    {
-      if (file_ptr->mask & GDB_READABLE)
-	FD_CLR (fd, &gdb_notifier.check_masks[0]);
-      if (file_ptr->mask & GDB_WRITABLE)
-	FD_CLR (fd, &gdb_notifier.check_masks[1]);
-      if (file_ptr->mask & GDB_EXCEPTION)
-	FD_CLR (fd, &gdb_notifier.check_masks[2]);
-
-      /* Find current max fd.  */
-
-      if ((fd + 1) == gdb_notifier.num_fds)
-	{
-	  gdb_notifier.num_fds--;
-	  for (i = gdb_notifier.num_fds; i; i--)
-	    {
-	      if (FD_ISSET (i - 1, &gdb_notifier.check_masks[0])
-		  || FD_ISSET (i - 1, &gdb_notifier.check_masks[1])
-		  || FD_ISSET (i - 1, &gdb_notifier.check_masks[2]))
-		break;
-	    }
-	  gdb_notifier.num_fds = i;
-	}
-    }
-
-  /* Deactivate the file descriptor, by clearing its mask, 
-     so that it will not fire again.  */
-
-  file_ptr->mask = 0;
-
-  /* If this file handler was going to be the next one to be handled,
-     advance to the next's next, if any.  */
-  if (gdb_notifier.next_file_handler == file_ptr)
-    {
-      if (file_ptr->next_file == NULL
-	  && file_ptr == gdb_notifier.first_file_handler)
-	gdb_notifier.next_file_handler = NULL;
-      else
-	get_next_file_handler_to_handle_and_advance ();
-    }
-
-  /* Get rid of the file handler in the file handler list.  */
-  if (file_ptr == gdb_notifier.first_file_handler)
-    gdb_notifier.first_file_handler = file_ptr->next_file;
-  else
-    {
-      for (prev_ptr = gdb_notifier.first_file_handler;
-	   prev_ptr->next_file != file_ptr;
-	   prev_ptr = prev_ptr->next_file)
-	;
-      prev_ptr->next_file = file_ptr->next_file;
-    }
-  xfree (file_ptr);
-}
-
-/* Handle the given event by calling the procedure associated to the
-   corresponding file handler.  */
-
-static void
-handle_file_event (file_handler *file_ptr, int ready_mask)
-{
-  int mask;
-#ifdef HAVE_POLL
-  int error_mask;
-#endif
-
-    {
-	{
-	  /* With poll, the ready_mask could have any of three events
-	     set to 1: POLLHUP, POLLERR, POLLNVAL.  These events
-	     cannot be used in the requested event mask (events), but
-	     they can be returned in the return mask (revents).  We
-	     need to check for those event too, and add them to the
-	     mask which will be passed to the handler.  */
-
-	  /* See if the desired events (mask) match the received
-	     events (ready_mask).  */
-
-	  if (use_poll)
-	    {
-#ifdef HAVE_POLL
-	      /* POLLHUP means EOF, but can be combined with POLLIN to
-		 signal more data to read.  */
-	      error_mask = POLLHUP | POLLERR | POLLNVAL;
-	      mask = ready_mask & (file_ptr->mask | error_mask);
-
-	      if ((mask & (POLLERR | POLLNVAL)) != 0)
-		{
-		  /* Work in progress.  We may need to tell somebody
-		     what kind of error we had.  */
-		  if (mask & POLLERR)
-		    warning (_("Error detected on fd %d"), file_ptr->fd);
-		  if (mask & POLLNVAL)
-		    warning (_("Invalid or non-`poll'able fd %d"),
-			     file_ptr->fd);
-		  file_ptr->error = 1;
-		}
-	      else
-		file_ptr->error = 0;
-#else
-	      internal_error (__FILE__, __LINE__,
-			      _("use_poll without HAVE_POLL"));
-#endif /* HAVE_POLL */
-	    }
-	  else
-	    {
-	      if (ready_mask & GDB_EXCEPTION)
-		{
-		  warning (_("Exception condition detected on fd %d"),
-			   file_ptr->fd);
-		  file_ptr->error = 1;
-		}
-	      else
-		file_ptr->error = 0;
-	      mask = ready_mask & file_ptr->mask;
-	    }
-
-	  /* If there was a match, then call the handler.  */
-	  if (mask != 0)
-	    (*file_ptr->proc) (file_ptr->error, file_ptr->client_data);
-	}
-    }
-}
-
-/* Wait for new events on the monitored file descriptors.  Run the
-   event handler if the first descriptor that is detected by the poll.
-   If BLOCK and if there are no events, this function will block in
-   the call to poll.  Return 1 if an event was handled.  Return -1 if
-   there are no file descriptors to monitor.  Return 1 if an event was
-   handled, otherwise returns 0.  */
-
-static int
-gdb_wait_for_event (int block)
-{
-  file_handler *file_ptr;
-  int num_found = 0;
-
-  /* Make sure all output is done before getting another event.  */
-  flush_streams ();
-
-  if (gdb_notifier.num_fds == 0)
-    return -1;
-
-  if (block)
-    update_wait_timeout ();
-
-  if (use_poll)
-    {
-#ifdef HAVE_POLL
-      int timeout;
-
-      if (block)
-	timeout = gdb_notifier.timeout_valid ? gdb_notifier.poll_timeout : -1;
-      else
-	timeout = 0;
-
-      num_found = poll (gdb_notifier.poll_fds,
-			(unsigned long) gdb_notifier.num_fds, timeout);
-
-      /* Don't print anything if we get out of poll because of a
-	 signal.  */
-      if (num_found == -1 && errno != EINTR)
-	perror_with_name (("poll"));
-#else
-      internal_error (__FILE__, __LINE__,
-		      _("use_poll without HAVE_POLL"));
-#endif /* HAVE_POLL */
-    }
-  else
-    {
-      struct timeval select_timeout;
-      struct timeval *timeout_p;
-
-      if (block)
-	timeout_p = gdb_notifier.timeout_valid
-	  ? &gdb_notifier.select_timeout : NULL;
-      else
-	{
-	  memset (&select_timeout, 0, sizeof (select_timeout));
-	  timeout_p = &select_timeout;
-	}
-
-      gdb_notifier.ready_masks[0] = gdb_notifier.check_masks[0];
-      gdb_notifier.ready_masks[1] = gdb_notifier.check_masks[1];
-      gdb_notifier.ready_masks[2] = gdb_notifier.check_masks[2];
-      num_found = gdb_select (gdb_notifier.num_fds,
-			      &gdb_notifier.ready_masks[0],
-			      &gdb_notifier.ready_masks[1],
-			      &gdb_notifier.ready_masks[2],
-			      timeout_p);
-
-      /* Clear the masks after an error from select.  */
-      if (num_found == -1)
-	{
-	  FD_ZERO (&gdb_notifier.ready_masks[0]);
-	  FD_ZERO (&gdb_notifier.ready_masks[1]);
-	  FD_ZERO (&gdb_notifier.ready_masks[2]);
-
-	  /* Dont print anything if we got a signal, let gdb handle
-	     it.  */
-	  if (errno != EINTR)
-	    perror_with_name (("select"));
-	}
-    }
-
-  /* Avoid looking at poll_fds[i]->revents if no event fired.  */
-  if (num_found <= 0)
-    return 0;
-
-  /* Run event handlers.  We always run just one handler and go back
-     to polling, in case a handler changes the notifier list.  Since
-     events for sources we haven't consumed yet wake poll/select
-     immediately, no event is lost.  */
-
-  /* To level the fairness across event descriptors, we handle them in
-     a round-robin-like fashion.  The number and order of descriptors
-     may change between invocations, but this is good enough.  */
-  if (use_poll)
-    {
-#ifdef HAVE_POLL
-      int i;
-      int mask;
-
-      while (1)
-	{
-	  if (gdb_notifier.next_poll_fds_index >= gdb_notifier.num_fds)
-	    gdb_notifier.next_poll_fds_index = 0;
-	  i = gdb_notifier.next_poll_fds_index++;
-
-	  gdb_assert (i < gdb_notifier.num_fds);
-	  if ((gdb_notifier.poll_fds + i)->revents)
-	    break;
-	}
-
-      for (file_ptr = gdb_notifier.first_file_handler;
-	   file_ptr != NULL;
-	   file_ptr = file_ptr->next_file)
-	{
-	  if (file_ptr->fd == (gdb_notifier.poll_fds + i)->fd)
-	    break;
-	}
-      gdb_assert (file_ptr != NULL);
-
-      mask = (gdb_notifier.poll_fds + i)->revents;
-      handle_file_event (file_ptr, mask);
-      return 1;
-#else
-      internal_error (__FILE__, __LINE__,
-		      _("use_poll without HAVE_POLL"));
-#endif /* HAVE_POLL */
-    }
-  else
-    {
-      /* See comment about even source fairness above.  */
-      int mask = 0;
-
-      do
-	{
-	  file_ptr = get_next_file_handler_to_handle_and_advance ();
-
-	  if (FD_ISSET (file_ptr->fd, &gdb_notifier.ready_masks[0]))
-	    mask |= GDB_READABLE;
-	  if (FD_ISSET (file_ptr->fd, &gdb_notifier.ready_masks[1]))
-	    mask |= GDB_WRITABLE;
-	  if (FD_ISSET (file_ptr->fd, &gdb_notifier.ready_masks[2]))
-	    mask |= GDB_EXCEPTION;
-	}
-      while (mask == 0);
-
-      handle_file_event (file_ptr, mask);
-      return 1;
-    }
-  return 0;
-}
-
-/* Create a timer that will expire in MS milliseconds from now.  When
-   the timer is ready, PROC will be executed.  At creation, the timer
-   is added to the timers queue.  This queue is kept sorted in order
-   of increasing timers.  Return a handle to the timer struct.  */
-
-int
-create_timer (int ms, timer_handler_func *proc,
-	      gdb_client_data client_data)
-{
-  using namespace std::chrono;
-  struct gdb_timer *timer_ptr, *timer_index, *prev_timer;
-
-  steady_clock::time_point time_now = steady_clock::now ();
-
-  timer_ptr = new gdb_timer ();
-  timer_ptr->when = time_now + milliseconds (ms);
-  timer_ptr->proc = proc;
-  timer_ptr->client_data = client_data;
-  timer_list.num_timers++;
-  timer_ptr->timer_id = timer_list.num_timers;
-
-  /* Now add the timer to the timer queue, making sure it is sorted in
-     increasing order of expiration.  */
-
-  for (timer_index = timer_list.first_timer;
-       timer_index != NULL;
-       timer_index = timer_index->next)
-    {
-      if (timer_index->when > timer_ptr->when)
-	break;
-    }
-
-  if (timer_index == timer_list.first_timer)
-    {
-      timer_ptr->next = timer_list.first_timer;
-      timer_list.first_timer = timer_ptr;
-
-    }
-  else
-    {
-      for (prev_timer = timer_list.first_timer;
-	   prev_timer->next != timer_index;
-	   prev_timer = prev_timer->next)
-	;
-
-      prev_timer->next = timer_ptr;
-      timer_ptr->next = timer_index;
-    }
-
-  gdb_notifier.timeout_valid = 0;
-  return timer_ptr->timer_id;
-}
-
-/* There is a chance that the creator of the timer wants to get rid of
-   it before it expires.  */
-void
-delete_timer (int id)
-{
-  struct gdb_timer *timer_ptr, *prev_timer = NULL;
-
-  /* Find the entry for the given timer.  */
-
-  for (timer_ptr = timer_list.first_timer; timer_ptr != NULL;
-       timer_ptr = timer_ptr->next)
-    {
-      if (timer_ptr->timer_id == id)
-	break;
-    }
-
-  if (timer_ptr == NULL)
-    return;
-  /* Get rid of the timer in the timer list.  */
-  if (timer_ptr == timer_list.first_timer)
-    timer_list.first_timer = timer_ptr->next;
-  else
-    {
-      for (prev_timer = timer_list.first_timer;
-	   prev_timer->next != timer_ptr;
-	   prev_timer = prev_timer->next)
-	;
-      prev_timer->next = timer_ptr->next;
-    }
-  delete timer_ptr;
-
-  gdb_notifier.timeout_valid = 0;
-}
-
-/* Convert a std::chrono duration to a struct timeval.  */
-
-template<typename Duration>
-static struct timeval
-duration_cast_timeval (const Duration &d)
-{
-  using namespace std::chrono;
-  seconds sec = duration_cast<seconds> (d);
-  microseconds msec = duration_cast<microseconds> (d - sec);
-
-  struct timeval tv;
-  tv.tv_sec = sec.count ();
-  tv.tv_usec = msec.count ();
-  return tv;
-}
-
-/* Update the timeout for the select() or poll().  Returns true if the
-   timer has already expired, false otherwise.  */
-
-static int
-update_wait_timeout (void)
-{
-  if (timer_list.first_timer != NULL)
-    {
-      using namespace std::chrono;
-      steady_clock::time_point time_now = steady_clock::now ();
-      struct timeval timeout;
-
-      if (timer_list.first_timer->when < time_now)
-	{
-	  /* It expired already.  */
-	  timeout.tv_sec = 0;
-	  timeout.tv_usec = 0;
-	}
-      else
-	{
-	  steady_clock::duration d = timer_list.first_timer->when - time_now;
-	  timeout = duration_cast_timeval (d);
-	}
-
-      /* Update the timeout for select/ poll.  */
-      if (use_poll)
-	{
-#ifdef HAVE_POLL
-	  gdb_notifier.poll_timeout = timeout.tv_sec * 1000;
-#else
-	  internal_error (__FILE__, __LINE__,
-			  _("use_poll without HAVE_POLL"));
-#endif /* HAVE_POLL */
-	}
-      else
-	{
-	  gdb_notifier.select_timeout.tv_sec = timeout.tv_sec;
-	  gdb_notifier.select_timeout.tv_usec = timeout.tv_usec;
-	}
-      gdb_notifier.timeout_valid = 1;
-
-      if (timer_list.first_timer->when < time_now)
-	return 1;
-    }
-  else
-    gdb_notifier.timeout_valid = 0;
-
-  return 0;
-}
-
-/* Check whether a timer in the timers queue is ready.  If a timer is
-   ready, call its handler and return.  Update the timeout for the
-   select() or poll() as well.  Return 1 if an event was handled,
-   otherwise returns 0.*/
-
-static int
-poll_timers (void)
-{
-  if (update_wait_timeout ())
-    {
-      struct gdb_timer *timer_ptr = timer_list.first_timer;
-      timer_handler_func *proc = timer_ptr->proc;
-      gdb_client_data client_data = timer_ptr->client_data;
-
-      /* Get rid of the timer from the beginning of the list.  */
-      timer_list.first_timer = timer_ptr->next;
-
-      /* Delete the timer before calling the callback, not after, in
-	 case the callback itself decides to try deleting the timer
-	 too.  */
-      delete timer_ptr;
-
-      /* Call the procedure associated with that timer.  */
-      (proc) (client_data);
-
-      return 1;
-    }
-
-  return 0;
-}