/* Event loop machinery for GDB, the GNU debugger.
- Copyright 1999 Free Software Foundation, Inc.
+ Copyright 1999, 2000, 2001 Free Software Foundation, Inc.
Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
This file is part of GDB.
Boston, MA 02111-1307, USA. */
#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>
+#elif defined (HAVE_SYS_POLL_H)
+#include <sys/poll.h>
#endif
+#endif
+
+#include <sys/types.h>
+#include "gdb_string.h"
#include <errno.h>
-#include <setjmp.h>
+#include <sys/time.h>
+
+typedef struct gdb_event gdb_event;
+typedef void (event_handler_func) (int);
+
+/* 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
+ 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 and such. */
+
+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. */
+ };
+
+/* 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;
+
+/* PROC is a function to be invoked when the READY flag is set. This
+ happens when there has been a signal and the corresponding signal
+ handler has 'triggered' this async_signal_handler for
+ execution. The actual work to be done in response to a signal will
+ 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. */
+typedef struct async_signal_handler
+ {
+ int ready; /* If ready, call this handler from the main event loop,
+ using invoke_async_handler. */
+ struct async_signal_handler *next_handler; /* Ptr to next handler */
+ sig_handler_func *proc; /* Function to call to do the work */
+ gdb_client_data client_data; /* Argument to async_handler_func */
+ }
+async_signal_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;
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;
-
- }
-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;
+ /* 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_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 select_timeout;
+
+ /* 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
+ {
+ struct timeval 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 */
+ }
+gdb_timer;
+
+/* 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;
/* All the async_signal_handlers gdb is interested in are kept onto
this list. */
}
sighandler_list;
-/* Is any of the handlers ready? Check this variable using
+/* Are 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 PARAMS ((int, int, handler_func *, gdb_client_data));
-static void invoke_async_signal_handler PARAMS ((void));
-static void handle_file_event PARAMS ((int));
-static int gdb_wait_for_event PARAMS ((void));
-static int gdb_do_one_event PARAMS ((void));
-static int check_async_ready PARAMS ((void));
+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);
+static void poll_timers (void);
\f
/* Insert an event object into the gdb event queue at
as last in first out. Event appended at the tail of the queue
will be processed first in first out. */
static void
-async_queue_event (event_ptr, position)
- gdb_event *event_ptr;
- queue_position position;
+async_queue_event (gdb_event * event_ptr, queue_position position)
{
if (position == TAIL)
{
processing. The procedure associated to this event is always
handle_file_event, which will in turn invoke the one that was
associated to FD when it was registered with the event loop. */
-gdb_event *
-create_file_event (fd)
- int fd;
+static gdb_event *
+create_file_event (int fd)
{
gdb_event *file_event_ptr;
priority events first, by invoking the associated event handler
procedure. */
static int
-process_event ()
+process_event (void)
{
gdb_event *event_ptr, *prev_ptr;
event_handler_func *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. */
+ /* Now call the procedure associated with the event. */
(*proc) (fd);
return 1;
}
/* 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 1 if something was done otherwise returns 0 (this can
- happen if there are no event sources to wait for). */
+ 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
+ occurs catch_errors() which calls this function returns zero. */
+
static int
-gdb_do_one_event ()
+gdb_do_one_event (void *data)
{
- int result = 0;
+ /* Any events already waiting in the queue? */
+ if (process_event ())
+ {
+ return 1;
+ }
- while (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)
{
- if (!SET_TOP_LEVEL ())
- {
- /* Any events already waiting in the queue? */
- if (process_event ())
- {
- result = 1;
- break;
- }
+ return -1;
+ }
- /* 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. */
+ /* Handle any new events occurred while waiting. */
+ if (process_event ())
+ {
+ return 1;
+ }
- result = gdb_wait_for_event ();
- if (result < 0)
- {
- result = 0;
- break;
- }
+ /* If gdb_wait_for_event has returned 1, it means that one
+ event has been handled. We break out of the loop. */
+ return 1;
+}
- /* Handle any new events occurred while waiting. */
- if (process_event ())
- {
- result = 1;
- break;
- }
+/* Start up the event loop. This is the entry point to the event loop
+ from the command loop. */
- /* If gdb_wait_for_event has returned 1, it means that one
- event has been handled. We break out of the loop. */
- if (result)
- break;
- } /* end of if !set_top_level */
- else
+void
+start_event_loop (void)
+{
+ /* Loop until there is nothing to do. This is the entry point to the
+ event loop engine. gdb_do_one_event, called via catch_errors()
+ will process one event for each invocation. It blocks waits for
+ an event and then processes it. >0 when an event is processed, 0
+ when catch_errors() caught an error and <0 when there are no
+ longer any event sources registered. */
+ while (1)
+ {
+ int result = catch_errors (gdb_do_one_event, 0, "", RETURN_MASK_ALL);
+ if (result < 0)
+ break;
+ if (result == 0)
{
/* FIXME: this should really be a call to a hook that is
interface specific, because interfaces can display the
whether display the prompt or not. */
}
}
- return result;
-}
-\f
-
-/* Start up the event loop. This is the entry point to the event loop
- from the command loop. */
-void
-start_event_loop ()
-{
- /* Loop until there is something to do. This is the entry point to
- the event loop engine. gdb_do_one_event will process one event
- for each invocation. It always returns 1, unless there are no
- more event sources registered. In this case it returns 0. */
- while (gdb_do_one_event () != 0)
- ;
/* We are done with the event loop. There are no more event sources
to listen to. So we exit GDB. */
}
\f
-
/* 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 (fd, proc, client_data)
- int fd;
- void (*proc) (void);
- gdb_client_data client_data;
+add_file_handler (int fd, handler_func * proc, gdb_client_data client_data)
{
#ifdef HAVE_POLL
- create_file_handler (fd, POLLIN, (handler_func *) 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, (handler_func *) 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
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 (fd, mask, proc, client_data)
- int fd;
- int mask;
- handler_func *proc;
- gdb_client_data client_data;
+create_file_handler (int fd, int mask, handler_func * proc, gdb_client_data client_data)
{
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;
break;
}
- /* It is a new file descriptor. */
+ /* 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 = (file_handler *) xmalloc (sizeof (file_handler));
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 *) 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;
+ 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
- (gdb_notifier.check_masks + MASK_SIZE)[index] &= ~bit;
+ {
+ if (mask & GDB_READABLE)
+ FD_SET (fd, &gdb_notifier.check_masks[0]);
+ else
+ FD_CLR (fd, &gdb_notifier.check_masks[0]);
- 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_WRITABLE)
+ FD_SET (fd, &gdb_notifier.check_masks[1]);
+ else
+ FD_CLR (fd, &gdb_notifier.check_masks[1]);
- if (gdb_notifier.num_fds <= fd)
- gdb_notifier.num_fds = fd + 1;
+ if (mask & GDB_EXCEPTION)
+ FD_SET (fd, &gdb_notifier.check_masks[2]);
+ else
+ FD_CLR (fd, &gdb_notifier.check_masks[2]);
-#endif /* HAVE_POLL */
+ if (gdb_notifier.num_fds <= fd)
+ gdb_notifier.num_fds = fd + 1;
+ }
}
/* 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 (fd)
- int fd;
+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 (event_file_desc)
- int event_file_desc;
+handle_file_event (int event_file_desc)
{
file_handler *file_ptr;
- int mask, error_mask;
+ int mask;
+#ifdef HAVE_POLL
+ int error_mask;
+ int error_mask_returned;
+#endif
/* 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 = POLLHUP | POLLERR | POLLNVAL;
+ mask = (file_ptr->ready_mask & file_ptr->mask) |
+ (file_ptr->ready_mask & error_mask);
+ error_mask_returned = mask & error_mask;
-#else /* ! HAVE_POLL */
- mask = file_ptr->ready_mask & file_ptr->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;
+ }
+ else
+ file_ptr->error = 0;
+#else
+ internal_error (__FILE__, __LINE__,
+ "use_poll without HAVE_POLL");
#endif /* HAVE_POLL */
+ }
+ else
+ {
+ 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;
+ }
/* Clear the received events for next time around. */
file_ptr->ready_mask = 0;
/* If there was a match, then call the handler. */
if (mask != 0)
- (*file_ptr->proc) (file_ptr->client_data);
+ (*file_ptr->proc) (file_ptr->error, file_ptr->client_data);
break;
}
}
Return -1 if there are no files descriptors to monitor,
otherwise return 0. */
static int
-gdb_wait_for_event ()
+gdb_wait_for_event (void)
{
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, -1);
-
-#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],
- NULL);
-
- /* Clear the masks after an error from select. */
- if (num_found == -1)
- memset (gdb_notifier.ready_masks,
- 0, 3 * MASK_SIZE * sizeof (fd_mask));
-
+ num_found =
+ poll (gdb_notifier.poll_fds,
+ (unsigned long) gdb_notifier.num_fds,
+ gdb_notifier.timeout_valid ? gdb_notifier.poll_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
+ internal_error (__FILE__, __LINE__,
+ "use_poll without HAVE_POLL");
#endif /* HAVE_POLL */
+ }
+ else
+ {
+ 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 = select (gdb_notifier.num_fds,
+ &gdb_notifier.ready_masks[0],
+ &gdb_notifier.ready_masks[1],
+ &gdb_notifier.ready_masks[2],
+ gdb_notifier.timeout_valid
+ ? &gdb_notifier.select_timeout : NULL);
+
+ /* 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 is we got a signal, let gdb handle it. */
+ if (errno != EINTR)
+ perror_with_name ("Select");
+ }
+ }
/* 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 (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;
+ }
- for (i = 0; (i < gdb_notifier.num_fds) && (num_found > 0); i++)
- {
- if ((gdb_notifier.poll_fds + i)->revents)
- num_found--;
- else
- continue;
+ 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
PROC is the function to call with CLIENT_DATA argument
whenever the handler is invoked. */
async_signal_handler *
-create_async_signal_handler (proc, client_data)
- handler_func *proc;
- gdb_client_data client_data;
+create_async_signal_handler (sig_handler_func * proc, gdb_client_data client_data)
{
async_signal_handler *async_handler_ptr;
some event. The caller of this function is the interrupt handler
associated with a signal. */
void
-mark_async_signal_handler (async_handler_ptr)
- async_signal_handler *async_handler_ptr;
+mark_async_signal_handler (async_signal_handler * async_handler_ptr)
{
((async_signal_handler *) async_handler_ptr)->ready = 1;
async_handler_ready = 1;
/* Call all the handlers that are ready. */
static void
-invoke_async_signal_handler ()
+invoke_async_signal_handler (void)
{
async_signal_handler *async_handler_ptr;
/* Delete an asynchronous handler (ASYNC_HANDLER_PTR).
Free the space allocated for it. */
void
-delete_async_signal_handler (async_handler_ptr)
- async_signal_handler **async_handler_ptr;
+delete_async_signal_handler (async_signal_handler ** async_handler_ptr)
{
async_signal_handler *prev_ptr;
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 ()
+check_async_ready (void)
{
return async_handler_ready;
}
+
+/* Create a timer that will expire in MILLISECONDS from now. When the
+ timer is ready, PROC will be executed. At creation, the timer is
+ aded 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 milliseconds, timer_handler_func * proc, gdb_client_data client_data)
+{
+ struct gdb_timer *timer_ptr, *timer_index, *prev_timer;
+ struct timeval time_now, delta;
+
+ /* compute seconds */
+ delta.tv_sec = milliseconds / 1000;
+ /* compute microseconds */
+ delta.tv_usec = (milliseconds % 1000) * 1000;
+
+ gettimeofday (&time_now, NULL);
+
+ timer_ptr = (struct gdb_timer *) xmalloc (sizeof (gdb_timer));
+ timer_ptr->when.tv_sec = time_now.tv_sec + delta.tv_sec;
+ timer_ptr->when.tv_usec = time_now.tv_usec + delta.tv_usec;
+ /* carry? */
+ if (timer_ptr->when.tv_usec >= 1000000)
+ {
+ timer_ptr->when.tv_sec += 1;
+ timer_ptr->when.tv_usec -= 1000000;
+ }
+ 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 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)))
+ 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;
+ }
+ 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. */
+static void
+handle_timer_event (int dummy)
+{
+ struct timeval time_now;
+ struct gdb_timer *timer_ptr, *saved_timer;
+
+ gettimeofday (&time_now, NULL);
+ timer_ptr = timer_list.first_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)))
+ break;
+
+ /* Get rid of the timer from the beginning of the list. */
+ timer_list.first_timer = timer_ptr->next;
+ saved_timer = timer_ptr;
+ timer_ptr = timer_ptr->next;
+ /* Call the procedure associated with that timer. */
+ (*saved_timer->proc) (saved_timer->client_data);
+ xfree (saved_timer);
+ }
+
+ gdb_notifier.timeout_valid = 0;
+}
+
+/* Check whether any timers in the timers queue are ready. If at least
+ one timer is ready, stick an event onto the event queue. Even in
+ case more than one timer is ready, one event is enough, because the
+ handle_timer_event() will go through the timers list and call the
+ procedures associated with all that have expired. Update the
+ timeout for the select() or poll() as well. */
+static void
+poll_timers (void)
+{
+ struct timeval time_now, delta;
+ gdb_event *event_ptr;
+
+ if (timer_list.first_timer != NULL)
+ {
+ gettimeofday (&time_now, NULL);
+ delta.tv_sec = timer_list.first_timer->when.tv_sec - time_now.tv_sec;
+ delta.tv_usec = timer_list.first_timer->when.tv_usec - time_now.tv_usec;
+ /* borrow? */
+ if (delta.tv_usec < 0)
+ {
+ delta.tv_sec -= 1;
+ delta.tv_usec += 1000000;
+ }
+
+ /* Oops it expired already. Tell select / poll to return
+ 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;
+ }
+
+ if (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;
+ 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.poll_timeout = delta.tv_sec * 1000;
+#else
+ 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
+ gdb_notifier.timeout_valid = 0;
+}