/* Event loop machinery for GDB, the GNU debugger.
- Copyright 1999 Free Software Foundation, Inc.
+ Copyright (C) 1999, 2000, 2001, 2002, 2005, 2006, 2007, 2008, 2009, 2010
+ 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 2 of the License, or
+ 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,
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, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
-#include "top.h"
#include "event-loop.h"
#include "event-top.h"
+
#ifdef HAVE_POLL
+#if defined (HAVE_POLL_H)
#include <poll.h>
-#else
-#include <sys/types.h>
-#endif
-#include <errno.h>
-#include <setjmp.h>
-#include <sys/time.h>
-
-/* Type of the mask arguments to select. */
-
-#ifndef NO_FD_SET
-#define SELECT_MASK fd_set
-#else
-#ifndef _AIX
-typedef long fd_mask;
+#elif defined (HAVE_SYS_POLL_H)
+#include <sys/poll.h>
#endif
-#if defined(_IBMR2)
-#define SELECT_MASK void
-#else
-#define SELECT_MASK int
-#endif
-#endif
-
-/* Define "NBBY" (number of bits per byte) if it's not already defined. */
-
-#ifndef NBBY
-#define NBBY 8
#endif
+#include <sys/types.h>
+#include "gdb_string.h"
+#include <errno.h>
+#include <sys/time.h>
+#include "exceptions.h"
+#include "gdb_assert.h"
+#include "gdb_select.h"
-/* Define the number of fd_masks in an fd_set */
-
-#ifndef FD_SETSIZE
-#ifdef OPEN_MAX
-#define FD_SETSIZE OPEN_MAX
-#else
-#define FD_SETSIZE 256
-#endif
-#endif
-#if !defined(howmany)
-#define howmany(x, y) (((x)+((y)-1))/(y))
-#endif
-#ifndef NFDBITS
-#define NFDBITS NBBY*sizeof(fd_mask)
-#endif
-#define MASK_SIZE howmany(FD_SETSIZE, NFDBITS)
-
+/* Data point to pass to the event handler. */
+typedef union event_data
+{
+ void *ptr;
+ int integer;
+} event_data;
typedef struct gdb_event gdb_event;
-typedef void (event_handler_func) (int);
+typedef void (event_handler_func) (event_data);
/* Event for the GDB event system. Events are queued by calling
async_queue_event and serviced later on by gdb_do_one_event. An
event can be, for instance, a file descriptor becoming ready to be
- read. Servicing an event simply means that the procedure PROC will
+ read. Servicing an event simply means that the procedure PROC will
be called. We have 2 queues, one for file handlers that we listen
to in the event loop, and one for the file handlers+events that are
- ready. The procedure PROC associated with each event is always the
- same (handle_file_event). Its duty is to invoke the handler
- associated with the file descriptor whose state change generated
- the event, plus doing other cleanups adn such. */
+ ready. The procedure PROC associated with each event is dependant
+ of the event source. In the case of monitored file descriptors, it
+ is always the same (handle_file_event). Its duty is to invoke the
+ handler associated with the file descriptor whose state change
+ generated the event, plus doing other cleanups and such. In the
+ case of async signal handlers, it is
+ invoke_async_signal_handler. */
struct gdb_event
{
- event_handler_func *proc; /* Procedure to call to service this event. */
- int fd; /* File descriptor that is ready. */
- struct gdb_event *next_event; /* Next in list of events or NULL. */
+ /* Procedure to call to service this event. */
+ event_handler_func *proc;
+
+ /* Data to pass to the event handler. */
+ event_data data;
+
+ /* Next in list of events or NULL. */
+ struct gdb_event *next_event;
};
/* Information about each file descriptor we register with the event
be carried out by PROC at a later time, within process_event. This
provides a deferred execution of signal handlers.
Async_init_signals takes care of setting up such an
- asyn_signal_handler for each interesting signal. */
+ async_signal_handler for each interesting signal. */
typedef struct async_signal_handler
{
int ready; /* If ready, call this handler from the main event loop,
}
async_signal_handler;
+/* PROC is a function to be invoked when the READY flag is set. This
+ happens when the event has been marked with
+ MARK_ASYNC_EVENT_HANDLER. The actual work to be done in response
+ to an event will be carried out by PROC at a later time, within
+ process_event. This provides a deferred execution of event
+ handlers. */
+typedef struct async_event_handler
+ {
+ /* If ready, call this handler from the main event loop, using
+ invoke_event_handler. */
+ int ready;
+
+ /* Point to next handler. */
+ struct async_event_handler *next_handler;
+
+ /* Function to call to do the work. */
+ async_event_handler_func *proc;
+
+ /* Argument to PROC. */
+ gdb_client_data client_data;
+ }
+async_event_handler;
+
/* Event queue:
- the first event in the queue is the head of the queue.
/* 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
-/* Poll based implementation of the notifier. */
+#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;
+#ifdef HAVE_POLL
/* Ptr to array of pollfd structures. */
struct pollfd *poll_fds;
- /* Number of file descriptors to monitor. */
- int num_fds;
-
/* Timeout in milliseconds for calls to poll(). */
- int timeout;
-
- /* Flag to tell whether the timeout value shuld be used. */
- int timeout_valid;
- }
-gdb_notifier;
-
-#else /* ! HAVE_POLL */
-
-/* Select based implementation of the notifier. */
-
-static struct
- {
- /* Ptr to head of file handler list. */
- file_handler *first_file_handler;
+ 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_mask check_masks[3 * MASK_SIZE];
+ fd_set check_masks[3];
/* What file descriptors were found ready by select. */
- fd_mask ready_masks[3 * MASK_SIZE];
+ fd_set ready_masks[3];
- /* Number of valid bits (highest fd value + 1). */
+ /* 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 timeout;
+ struct timeval select_timeout;
- /* Flag to tell whether the timeout struct should be used. */
+ /* Flag to tell whether the timeout should be used. */
int timeout_valid;
}
gdb_notifier;
-#endif /* HAVE_POLL */
-
/* Structure associated with a timer. PROC will be executed at the
first occasion after WHEN. */
struct gdb_timer
}
sighandler_list;
-/* Is any of the handlers ready? Check this variable using
- check_async_ready. This is used by process_event, to determine
- whether or not to invoke the invoke_async_signal_handler
- function. */
-static int async_handler_ready = 0;
-
-static void create_file_handler (int fd, int mask, handler_func * proc, gdb_client_data client_data);
-static void invoke_async_signal_handler (void);
-static void handle_file_event (int event_file_desc);
-static int gdb_wait_for_event (void);
-static int gdb_do_one_event (void *data);
-static int check_async_ready (void);
-static void async_queue_event (gdb_event * event_ptr, queue_position position);
-static gdb_event *create_file_event (int fd);
-static int process_event (void);
-static void handle_timer_event (int dummy);
+/* All the async_event_handlers gdb is interested in are kept onto
+ this list. */
+static struct
+ {
+ /* Pointer to first in handler list. */
+ async_event_handler *first_handler;
+
+ /* Pointer to last in handler list. */
+ async_event_handler *last_handler;
+ }
+async_event_handler_list;
+
+static int invoke_async_signal_handlers (void);
+static void create_file_handler (int fd, int mask, handler_func *proc,
+ gdb_client_data client_data);
+static void handle_file_event (event_data data);
+static void check_async_event_handlers (void);
+static int gdb_wait_for_event (int);
static void poll_timers (void);
\f
}
}
+/* Create a generic event, to be enqueued in the event queue for
+ processing. PROC is the procedure associated to the event. DATA
+ is passed to PROC upon PROC invocation. */
+
+static gdb_event *
+create_event (event_handler_func proc, event_data data)
+{
+ gdb_event *event;
+
+ event = xmalloc (sizeof (*event));
+ event->proc = proc;
+ event->data = data;
+
+ return event;
+}
+
/* Create a file event, to be enqueued in the event queue for
processing. The procedure associated to this event is always
handle_file_event, which will in turn invoke the one that was
static gdb_event *
create_file_event (int fd)
{
- gdb_event *file_event_ptr;
+ event_data data;
- file_event_ptr = (gdb_event *) xmalloc (sizeof (gdb_event));
- file_event_ptr->proc = handle_file_event;
- file_event_ptr->fd = fd;
- return (file_event_ptr);
+ data.integer = fd;
+ return create_event (handle_file_event, data);
}
/* Process one event.
or an asynchronous event handler can be invoked in response to
the reception of a signal.
If an event was processed (either way), 1 is returned otherwise
- 0 is returned.
+ 0 is returned.
Scan the queue from head to tail, processing therefore the high
priority events first, by invoking the associated event handler
procedure. */
{
gdb_event *event_ptr, *prev_ptr;
event_handler_func *proc;
- int fd;
+ event_data data;
/* First let's see if there are any asynchronous event handlers that
are ready. These would be the result of invoking any of the
signal handlers. */
- if (check_async_ready ())
- {
- invoke_async_signal_handler ();
- return 1;
- }
+ if (invoke_async_signal_handlers ())
+ return 1;
/* Look in the event queue to find an event that is ready
to be processed. */
/* Call the handler for the event. */
proc = event_ptr->proc;
- fd = event_ptr->fd;
+ data = event_ptr->data;
/* Let's get rid of the event from the event queue. We need to
do this now because while processing the event, the proc
if (event_ptr->next_event == NULL)
event_queue.last_event = prev_ptr;
}
- free ((char *) event_ptr);
+ xfree (event_ptr);
- /* Now call the procedure associted with the event. */
- (*proc) (fd);
+ /* Now call the procedure associated with the event. */
+ (*proc) (data);
return 1;
}
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). If an error
- occures catch_errors() which calls this function returns zero. */
+ occurs catch_errors() which calls this function returns zero. */
-static int
+int
gdb_do_one_event (void *data)
{
- /* Any events already waiting in the queue? */
+ static int event_source_head = 0;
+ const int number_of_sources = 3;
+ int current = 0;
+
+ /* Any events already waiting in the queue? */
if (process_event ())
+ 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++)
{
- return 1;
- }
-
- /* Are any timers that are ready? If so, put an event on the queue. */
- poll_timers ();
-
- /* Wait 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 () < 0)
- {
- return -1;
+ switch (event_source_head)
+ {
+ case 0:
+ /* Are any timers that are ready? If so, put an event on the
+ queue. */
+ poll_timers ();
+ break;
+ case 1:
+ /* Are there events already waiting to be collected on the
+ monitored file descriptors? */
+ gdb_wait_for_event (0);
+ break;
+ case 2:
+ /* Are there any asynchronous event handlers ready? */
+ check_async_event_handlers ();
+ break;
+ }
+
+ event_source_head++;
+ if (event_source_head == number_of_sources)
+ event_source_head = 0;
}
-
- /* Handle any new events occurred while waiting. */
+
+ /* Handle any new events collected. */
if (process_event ())
- {
- 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;
+
+ /* 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;
+
+ /* Handle any new events occurred while waiting. */
+ if (process_event ())
+ 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;
}
longer any event sources registered. */
while (1)
{
- int result = catch_errors (gdb_do_one_event, 0, "", RETURN_MASK_ALL);
- if (result < 0)
+ int gdb_result;
+
+ gdb_result = catch_errors (gdb_do_one_event, 0, "", RETURN_MASK_ALL);
+ if (gdb_result < 0)
break;
- if (result == 0)
+
+ /* 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. */
+
+ if (gdb_result == 0)
{
+ /* If any exception escaped to here, we better enable
+ stdin. Otherwise, any command that calls async_disable_stdin,
+ and then throws, will leave stdin inoperable. */
+ async_enable_stdin ();
/* FIXME: this should really be a call to a hook that is
interface specific, because interfaces can display the
prompt in their own way. */
display_gdb_prompt (0);
+ /* This call looks bizarre, but it is required. If the user
+ entered a command that caused an error,
+ after_char_processing_hook won't be called from
+ rl_callback_read_char_wrapper. Using a cleanup there
+ won't work, since we want this function to be called
+ after a new prompt is printed. */
+ if (after_char_processing_hook)
+ (*after_char_processing_hook) ();
/* Maybe better to set a flag to be checked somewhere as to
whether display the prompt or not. */
}
add_file_handler (int fd, handler_func * proc, gdb_client_data client_data)
{
#ifdef HAVE_POLL
- create_file_handler (fd, POLLIN, proc, client_data);
+ 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
- create_file_handler (fd, GDB_READABLE | GDB_EXCEPTION, proc, client_data);
+ 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
{
file_handler *file_ptr;
-#ifndef HAVE_POLL
- int index, bit;
-#endif
-
/* 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->ready_mask = 0;
file_ptr->next_file = gdb_notifier.first_file_handler;
gdb_notifier.first_file_handler = file_ptr;
-#ifdef HAVE_POLL
- gdb_notifier.num_fds++;
-#endif
- }
- file_ptr->proc = proc;
- file_ptr->client_data = client_data;
- file_ptr->mask = mask;
+ 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 =
+ (struct pollfd *) xmalloc (sizeof (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 (gdb_notifier.poll_fds)
- gdb_notifier.poll_fds =
- (struct pollfd *) realloc (gdb_notifier.poll_fds,
- (gdb_notifier.num_fds) * sizeof (struct pollfd));
- else
- gdb_notifier.poll_fds =
- (struct pollfd *) xmalloc (sizeof (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 /* ! HAVE_POLL */
-
- index = fd / (NBBY * sizeof (fd_mask));
- bit = 1 << (fd % (NBBY * sizeof (fd_mask)));
-
- if (mask & GDB_READABLE)
- gdb_notifier.check_masks[index] |= bit;
- else
- gdb_notifier.check_masks[index] &= ~bit;
-
- if (mask & GDB_WRITABLE)
- (gdb_notifier.check_masks + MASK_SIZE)[index] |= bit;
- else
- (gdb_notifier.check_masks + MASK_SIZE)[index] &= ~bit;
+ 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)
- (gdb_notifier.check_masks + 2 * (MASK_SIZE))[index] |= bit;
- else
- (gdb_notifier.check_masks + 2 * (MASK_SIZE))[index] &= ~bit;
+ 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;
+ if (gdb_notifier.num_fds <= fd)
+ gdb_notifier.num_fds = fd + 1;
+ }
+ }
-#endif /* HAVE_POLL */
+ file_ptr->proc = proc;
+ file_ptr->client_data = client_data;
+ file_ptr->mask = mask;
}
/* Remove the file descriptor FD from the list of monitored fd's:
delete_file_handler (int fd)
{
file_handler *file_ptr, *prev_ptr = NULL;
- int i, j;
+ int i;
+#ifdef HAVE_POLL
+ int j;
struct pollfd *new_poll_fds;
-#ifndef HAVE_POLL
- int index, bit;
- unsigned long flags;
#endif
/* Find the entry for the given file. */
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. */
+ /* 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));
+ 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)
+ for (i = 0, j = 0; i < gdb_notifier.num_fds; i++)
{
- (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++;
+ 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 */
}
- free (gdb_notifier.poll_fds);
- gdb_notifier.poll_fds = new_poll_fds;
- gdb_notifier.num_fds--;
-
-#else /* ! HAVE_POLL */
-
- index = fd / (NBBY * sizeof (fd_mask));
- bit = 1 << (fd % (NBBY * sizeof (fd_mask)));
-
- if (file_ptr->mask & GDB_READABLE)
- gdb_notifier.check_masks[index] &= ~bit;
- if (file_ptr->mask & GDB_WRITABLE)
- (gdb_notifier.check_masks + MASK_SIZE)[index] &= ~bit;
- if (file_ptr->mask & GDB_EXCEPTION)
- (gdb_notifier.check_masks + 2 * (MASK_SIZE))[index] &= ~bit;
+ 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. */
+ /* Find current max fd. */
- if ((fd + 1) == gdb_notifier.num_fds)
- {
- for (gdb_notifier.num_fds = 0; index >= 0; index--)
+ if ((fd + 1) == gdb_notifier.num_fds)
{
- flags = gdb_notifier.check_masks[index]
- | (gdb_notifier.check_masks + MASK_SIZE)[index]
- | (gdb_notifier.check_masks + 2 * (MASK_SIZE))[index];
- if (flags)
+ gdb_notifier.num_fds--;
+ for (i = gdb_notifier.num_fds; i; i--)
{
- for (i = (NBBY * sizeof (fd_mask)); i > 0; i--)
- {
- if (flags & (((unsigned long) 1) << (i - 1)))
- break;
- }
- gdb_notifier.num_fds = index * (NBBY * sizeof (fd_mask)) + i;
- break;
+ 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;
}
}
-#endif /* HAVE_POLL */
/* Deactivate the file descriptor, by clearing its mask,
so that it will not fire again. */
;
prev_ptr->next_file = file_ptr->next_file;
}
- free ((char *) file_ptr);
+ xfree (file_ptr);
}
/* Handle the given event by calling the procedure associated to the
through event_ptr->proc. EVENT_FILE_DESC is file descriptor of the
event in the front of the event queue. */
static void
-handle_file_event (int event_file_desc)
+handle_file_event (event_data data)
{
file_handler *file_ptr;
int mask;
int error_mask;
int error_mask_returned;
#endif
+ int event_file_desc = data.integer;
/* Search the file handler list to find one that matches the fd in
the event. */
/* See if the desired events (mask) match the received
events (ready_mask). */
+ if (use_poll)
+ {
#ifdef HAVE_POLL
- error_mask = POLLHUP | POLLERR | POLLNVAL;
- mask = (file_ptr->ready_mask & file_ptr->mask) |
- (file_ptr->ready_mask & error_mask);
- error_mask_returned = mask & error_mask;
+ error_mask = POLLHUP | POLLERR | POLLNVAL;
+ mask = (file_ptr->ready_mask & file_ptr->mask) |
+ (file_ptr->ready_mask & error_mask);
+ error_mask_returned = mask & error_mask;
- if (error_mask_returned != 0)
- {
- /* Work in progress. We may need to tell somebody what
- kind of error we had. */
- if (error_mask_returned & POLLHUP)
- printf_unfiltered ("Hangup detected on fd %d\n", file_ptr->fd);
- if (error_mask_returned & POLLERR)
- printf_unfiltered ("Error detected on fd %d\n", file_ptr->fd);
- if (error_mask_returned & POLLNVAL)
- printf_unfiltered ("Invalid or non-`poll'able fd %d\n", file_ptr->fd);
- file_ptr->error = 1;
+ if (error_mask_returned != 0)
+ {
+ /* Work in progress. We may need to tell somebody what
+ kind of error we had. */
+ if (error_mask_returned & POLLHUP)
+ printf_unfiltered (_("Hangup detected on fd %d\n"), file_ptr->fd);
+ if (error_mask_returned & POLLERR)
+ printf_unfiltered (_("Error detected on fd %d\n"), file_ptr->fd);
+ if (error_mask_returned & POLLNVAL)
+ printf_unfiltered (_("Invalid or non-`poll'able fd %d\n"), 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
- file_ptr->error = 0;
-#else /* ! HAVE_POLL */
- if (file_ptr->ready_mask & GDB_EXCEPTION)
{
- printf_unfiltered ("Exception condition detected on fd %d\n", file_ptr->fd);
- file_ptr->error = 1;
+ if (file_ptr->ready_mask & GDB_EXCEPTION)
+ {
+ printf_unfiltered (_("Exception condition detected on fd %d\n"), file_ptr->fd);
+ file_ptr->error = 1;
+ }
+ else
+ file_ptr->error = 0;
+ mask = file_ptr->ready_mask & file_ptr->mask;
}
- else
- file_ptr->error = 0;
- mask = file_ptr->ready_mask & file_ptr->mask;
-#endif /* HAVE_POLL */
/* Clear the received events for next time around. */
file_ptr->ready_mask = 0;
}
}
-/* Called by gdb_do_one_event to wait for new events on the
- monitored file descriptors. Queue file events as they are
- detected by the poll.
- If there are no events, this function will block in the
- call to poll.
- Return -1 if there are no files descriptors to monitor,
- otherwise return 0. */
+/* Called by gdb_do_one_event to wait for new events on the monitored
+ file descriptors. Queue file events as they are detected by the
+ poll. If BLOCK and if there are no events, this function will
+ block in the call to poll. Return -1 if there are no files
+ descriptors to monitor, otherwise return 0. */
static int
-gdb_wait_for_event (void)
+gdb_wait_for_event (int block)
{
file_handler *file_ptr;
gdb_event *file_event_ptr;
int num_found = 0;
int i;
-#ifndef HAVE_POLL
- int mask, bit, index;
-#endif
-
/* Make sure all output is done before getting another event. */
gdb_flush (gdb_stdout);
gdb_flush (gdb_stderr);
if (gdb_notifier.num_fds == 0)
return -1;
+ if (use_poll)
+ {
#ifdef HAVE_POLL
- num_found =
- poll (gdb_notifier.poll_fds,
- (unsigned long) gdb_notifier.num_fds,
- gdb_notifier.timeout_valid ? gdb_notifier.timeout : -1);
-
- /* 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 /* ! HAVE_POLL */
- memcpy (gdb_notifier.ready_masks,
- gdb_notifier.check_masks,
- 3 * MASK_SIZE * sizeof (fd_mask));
- num_found = select (gdb_notifier.num_fds,
- (SELECT_MASK *) & gdb_notifier.ready_masks[0],
- (SELECT_MASK *) & gdb_notifier.ready_masks[MASK_SIZE],
- (SELECT_MASK *) & gdb_notifier.ready_masks[2 * MASK_SIZE],
- gdb_notifier.timeout_valid ? &gdb_notifier.timeout : NULL);
-
- /* Clear the masks after an error from select. */
- if (num_found == -1)
+ 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
{
- memset (gdb_notifier.ready_masks,
- 0, 3 * MASK_SIZE * sizeof (fd_mask));
- /* Dont print anything is we got a signal, let gdb handle it. */
- if (errno != EINTR)
- perror_with_name ("Select");
+ 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"));
+ }
}
-#endif /* HAVE_POLL */
/* Enqueue all detected file events. */
+ if (use_poll)
+ {
#ifdef HAVE_POLL
+ for (i = 0; (i < gdb_notifier.num_fds) && (num_found > 0); i++)
+ {
+ if ((gdb_notifier.poll_fds + i)->revents)
+ num_found--;
+ else
+ continue;
- for (i = 0; (i < gdb_notifier.num_fds) && (num_found > 0); i++)
- {
- if ((gdb_notifier.poll_fds + i)->revents)
- num_found--;
- else
- continue;
+ 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;
+ }
+ if (file_ptr)
+ {
+ /* Enqueue an event only if this is still a new event for
+ this fd. */
+ if (file_ptr->ready_mask == 0)
+ {
+ file_event_ptr = create_file_event (file_ptr->fd);
+ async_queue_event (file_event_ptr, TAIL);
+ }
+ file_ptr->ready_mask = (gdb_notifier.poll_fds + i)->revents;
+ }
+ }
+#else
+ internal_error (__FILE__, __LINE__,
+ _("use_poll without HAVE_POLL"));
+#endif /* HAVE_POLL */
+ }
+ else
+ {
for (file_ptr = gdb_notifier.first_file_handler;
- file_ptr != NULL;
+ (file_ptr != NULL) && (num_found > 0);
file_ptr = file_ptr->next_file)
{
- if (file_ptr->fd == (gdb_notifier.poll_fds + i)->fd)
- break;
- }
+ int mask = 0;
+
+ 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;
+
+ if (!mask)
+ continue;
+ else
+ num_found--;
- if (file_ptr)
- {
/* Enqueue an event only if this is still a new event for
this fd. */
+
if (file_ptr->ready_mask == 0)
{
file_event_ptr = create_file_event (file_ptr->fd);
async_queue_event (file_event_ptr, TAIL);
}
+ file_ptr->ready_mask = mask;
}
-
- file_ptr->ready_mask = (gdb_notifier.poll_fds + i)->revents;
- }
-
-#else /* ! HAVE_POLL */
- for (file_ptr = gdb_notifier.first_file_handler;
- (file_ptr != NULL) && (num_found > 0);
- file_ptr = file_ptr->next_file)
- {
- index = file_ptr->fd / (NBBY * sizeof (fd_mask));
- bit = 1 << (file_ptr->fd % (NBBY * sizeof (fd_mask)));
- mask = 0;
-
- if (gdb_notifier.ready_masks[index] & bit)
- mask |= GDB_READABLE;
- if ((gdb_notifier.ready_masks + MASK_SIZE)[index] & bit)
- mask |= GDB_WRITABLE;
- if ((gdb_notifier.ready_masks + 2 * (MASK_SIZE))[index] & bit)
- mask |= GDB_EXCEPTION;
-
- if (!mask)
- continue;
- else
- num_found--;
-
- /* Enqueue an event only if this is still a new event for
- this fd. */
-
- if (file_ptr->ready_mask == 0)
- {
- file_event_ptr = create_file_event (file_ptr->fd);
- async_queue_event (file_event_ptr, TAIL);
- }
- file_ptr->ready_mask = mask;
}
-#endif /* HAVE_POLL */
-
return 0;
}
\f
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 handler
void
mark_async_signal_handler (async_signal_handler * async_handler_ptr)
{
- ((async_signal_handler *) async_handler_ptr)->ready = 1;
- async_handler_ready = 1;
+ async_handler_ptr->ready = 1;
}
-/* Call all the handlers that are ready. */
-static void
-invoke_async_signal_handler (void)
+/* 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;
- if (async_handler_ready == 0)
- return;
- async_handler_ready = 0;
-
- /* Invoke ready handlers. */
+ /* Invoke ready handlers. */
while (1)
{
}
if (async_handler_ptr == NULL)
break;
+ any_ready = 1;
async_handler_ptr->ready = 0;
(*async_handler_ptr->proc) (async_handler_ptr->client_data);
}
- return;
+ return any_ready;
}
/* Delete an asynchronous handler (ASYNC_HANDLER_PTR).
else
{
prev_ptr = sighandler_list.first_handler;
- while (prev_ptr->next_handler != (*async_handler_ptr) && prev_ptr)
+ while (prev_ptr && prev_ptr->next_handler != (*async_handler_ptr))
prev_ptr = prev_ptr->next_handler;
prev_ptr->next_handler = (*async_handler_ptr)->next_handler;
if (sighandler_list.last_handler == (*async_handler_ptr))
sighandler_list.last_handler = prev_ptr;
}
- free ((char *) (*async_handler_ptr));
+ xfree ((*async_handler_ptr));
(*async_handler_ptr) = NULL;
}
-/* Is it necessary to call invoke_async_signal_handler? */
-static int
-check_async_ready (void)
+/* Create an asynchronous event handler, allocating memory for it.
+ Return a pointer to the newly created handler. PROC is the
+ function to call with CLIENT_DATA argument whenever the handler is
+ invoked. */
+async_event_handler *
+create_async_event_handler (async_event_handler_func *proc,
+ gdb_client_data client_data)
{
- return async_handler_ready;
+ async_event_handler *h;
+
+ h = xmalloc (sizeof (*h));
+ h->ready = 0;
+ h->next_handler = NULL;
+ h->proc = proc;
+ h->client_data = client_data;
+ if (async_event_handler_list.first_handler == NULL)
+ async_event_handler_list.first_handler = h;
+ else
+ async_event_handler_list.last_handler->next_handler = h;
+ async_event_handler_list.last_handler = h;
+ return h;
+}
+
+/* Mark the handler (ASYNC_HANDLER_PTR) as ready. This information
+ will be used by gdb_do_one_event. The caller will be whoever
+ created the event source, and wants to signal that the event is
+ ready to be handled. */
+void
+mark_async_event_handler (async_event_handler *async_handler_ptr)
+{
+ async_handler_ptr->ready = 1;
+}
+
+struct async_event_handler_data
+{
+ async_event_handler_func* proc;
+ gdb_client_data client_data;
+};
+
+static void
+invoke_async_event_handler (event_data data)
+{
+ struct async_event_handler_data *hdata = data.ptr;
+ async_event_handler_func* proc = hdata->proc;
+ gdb_client_data client_data = hdata->client_data;
+
+ xfree (hdata);
+ (*proc) (client_data);
+}
+
+/* Check if any asynchronous event handlers are ready, and queue
+ events in the ready queue for any that are. */
+static void
+check_async_event_handlers (void)
+{
+ async_event_handler *async_handler_ptr;
+ struct async_event_handler_data *hdata;
+ struct gdb_event *event_ptr;
+ event_data data;
+
+ for (async_handler_ptr = async_event_handler_list.first_handler;
+ async_handler_ptr != NULL;
+ async_handler_ptr = async_handler_ptr->next_handler)
+ {
+ if (async_handler_ptr->ready)
+ {
+ async_handler_ptr->ready = 0;
+
+ hdata = xmalloc (sizeof (*hdata));
+
+ hdata->proc = async_handler_ptr->proc;
+ hdata->client_data = async_handler_ptr->client_data;
+
+ data.ptr = hdata;
+
+ event_ptr = create_event (invoke_async_event_handler, data);
+ async_queue_event (event_ptr, TAIL);
+ }
+ }
+}
+
+/* Delete an asynchronous handler (ASYNC_HANDLER_PTR).
+ Free the space allocated for it. */
+void
+delete_async_event_handler (async_event_handler **async_handler_ptr)
+{
+ async_event_handler *prev_ptr;
+
+ if (async_event_handler_list.first_handler == *async_handler_ptr)
+ {
+ async_event_handler_list.first_handler = (*async_handler_ptr)->next_handler;
+ if (async_event_handler_list.first_handler == NULL)
+ async_event_handler_list.last_handler = NULL;
+ }
+ else
+ {
+ prev_ptr = async_event_handler_list.first_handler;
+ while (prev_ptr && prev_ptr->next_handler != *async_handler_ptr)
+ prev_ptr = prev_ptr->next_handler;
+ prev_ptr->next_handler = (*async_handler_ptr)->next_handler;
+ if (async_event_handler_list.last_handler == (*async_handler_ptr))
+ async_event_handler_list.last_handler = prev_ptr;
+ }
+ xfree (*async_handler_ptr);
+ *async_handler_ptr = NULL;
}
/* Create a timer that will expire in MILLISECONDS from now. When the
{
/* If the seconds field is greater or if it is the same, but the
microsecond field is greater. */
- if ((timer_index->when.tv_sec > timer_ptr->when.tv_sec) ||
- ((timer_index->when.tv_sec == timer_ptr->when.tv_sec)
- && (timer_index->when.tv_usec > timer_ptr->when.tv_usec)))
+ if ((timer_index->when.tv_sec > timer_ptr->when.tv_sec)
+ || ((timer_index->when.tv_sec == timer_ptr->when.tv_sec)
+ && (timer_index->when.tv_usec > timer_ptr->when.tv_usec)))
break;
}
;
prev_timer->next = timer_ptr->next;
}
- free ((char *) timer_ptr);
+ xfree (timer_ptr);
gdb_notifier.timeout_valid = 0;
}
/* When a timer event is put on the event queue, it will be handled by
- this function. Just call the assiciated procedure and delete the
- timer event from the event queue. Repeat this for each timer that
- has expired. */
+ this function. Just call the associated procedure and delete the
+ timer event from the event queue. Repeat this for each timer that
+ has expired. */
static void
-handle_timer_event (int dummy)
+handle_timer_event (event_data dummy)
{
struct timeval time_now;
struct gdb_timer *timer_ptr, *saved_timer;
while (timer_ptr != NULL)
{
- if ((timer_ptr->when.tv_sec > time_now.tv_sec) ||
- ((timer_ptr->when.tv_sec == time_now.tv_sec) &&
- (timer_ptr->when.tv_usec > time_now.tv_usec)))
+ if ((timer_ptr->when.tv_sec > time_now.tv_sec)
+ || ((timer_ptr->when.tv_sec == time_now.tv_sec)
+ && (timer_ptr->when.tv_usec > time_now.tv_usec)))
break;
/* Get rid of the timer from the beginning of the list. */
timer_ptr = timer_ptr->next;
/* Call the procedure associated with that timer. */
(*saved_timer->proc) (saved_timer->client_data);
- free (saved_timer);
+ xfree (saved_timer);
}
gdb_notifier.timeout_valid = 0;
}
/* Oops it expired already. Tell select / poll to return
- immediately. */
- if (delta.tv_sec < 0)
+ immediately. (Cannot simply test if delta.tv_sec is negative
+ because time_t might be unsigned.) */
+ if (timer_list.first_timer->when.tv_sec < time_now.tv_sec
+ || (timer_list.first_timer->when.tv_sec == time_now.tv_sec
+ && timer_list.first_timer->when.tv_usec < time_now.tv_usec))
{
delta.tv_sec = 0;
delta.tv_usec = 0;
{
event_ptr = (gdb_event *) xmalloc (sizeof (gdb_event));
event_ptr->proc = handle_timer_event;
- event_ptr->fd = timer_list.first_timer->timer_id;
+ event_ptr->data.integer = timer_list.first_timer->timer_id;
async_queue_event (event_ptr, TAIL);
}
/* Now we need to update the timeout for select/ poll, because we
don't want to sit there while this timer is expiring. */
+ if (use_poll)
+ {
#ifdef HAVE_POLL
- gdb_notifier.timeout = delta.tv_sec * 1000;
+ gdb_notifier.poll_timeout = delta.tv_sec * 1000;
#else
- gdb_notifier.timeout.tv_sec = delta.tv_sec;
- gdb_notifier.timeout.tv_usec = delta.tv_usec;
-#endif
+ internal_error (__FILE__, __LINE__,
+ _("use_poll without HAVE_POLL"));
+#endif /* HAVE_POLL */
+ }
+ else
+ {
+ gdb_notifier.select_timeout.tv_sec = delta.tv_sec;
+ gdb_notifier.select_timeout.tv_usec = delta.tv_usec;
+ }
gdb_notifier.timeout_valid = 1;
}
else
projects / deliverable / binutils-gdb.git / blobdiff