/* Event loop machinery for the remote server for GDB.
- Copyright (C) 1999-2002, 2005-2008, 2010-2012 Free Software
- Foundation, Inc.
+ Copyright (C) 1999-2015 Free Software Foundation, Inc.
This file is part of GDB.
/* Based on src/gdb/event-loop.c. */
#include "server.h"
+#include "queue.h"
#include <sys/types.h>
-#include <string.h>
#include <sys/time.h>
#ifdef USE_WIN32API
#include <io.h>
#endif
-#ifdef HAVE_ERRNO_H
-#include <errno.h>
-#endif
-
-#ifdef HAVE_UNISTD_H
#include <unistd.h>
-#endif
typedef struct gdb_event gdb_event;
typedef int (event_handler_func) (gdb_fildes_t);
#define GDB_WRITABLE (1<<2)
#define GDB_EXCEPTION (1<<3)
-/* Events are queued by calling async_queue_event and serviced later
+/* Events are queued by calling 'QUEUE_enque (gdb_event_p, event_queue,
+ file_event_ptr)' and serviced later
on by 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,
descriptor whose state change generated the event, plus doing other
cleanups and such. */
-struct gdb_event
+typedef struct gdb_event
{
/* Procedure to call to service this event. */
event_handler_func *proc;
/* File descriptor that is ready. */
gdb_fildes_t fd;
-
- /* Next in list of events or NULL. */
- struct gdb_event *next_event;
- };
+ } *gdb_event_p;
/* Information about each file descriptor we register with the event
loop. */
}
file_handler;
-/* Event queue:
-
- Events can be inserted at the front of the queue or at the end of
- the queue. Events will be extracted from the queue for processing
- starting from the head. Therefore, events inserted at the head of
- the queue will be processed in a last in first out fashion, while
- those inserted at the tail of the queue will be processed in a
- first in first out manner. All the fields are NULL if the queue is
- empty. */
-
-static struct
- {
- /* The first pending event. */
- gdb_event *first_event;
-
- /* The last pending event. */
- gdb_event *last_event;
- }
-event_queue;
+DECLARE_QUEUE_P(gdb_event_p);
+static QUEUE(gdb_event_p) *event_queue = NULL;
+DEFINE_QUEUE_P(gdb_event_p);
/* Gdb_notifier is just a list of file descriptors gdb is interested
in. These are the input file descriptor, and the target file
{
int id;
callback_handler_func *proc;
- gdb_client_data *data;
+ gdb_client_data data;
struct callback_event *next;
};
}
callback_list;
-/* Insert an event object into the gdb event queue.
-
- EVENT_PTR points to the event to be inserted into the queue. The
- caller must allocate memory for the event. It is freed after the
- event has ben handled. Events in the queue will be processed head
- to tail, therefore, events will be processed first in first
- out. */
+/* Free EVENT. */
static void
-async_queue_event (gdb_event *event_ptr)
+gdb_event_xfree (struct gdb_event *event)
{
- /* The event will become the new last_event. */
+ xfree (event);
+}
- event_ptr->next_event = NULL;
- if (event_queue.first_event == NULL)
- event_queue.first_event = event_ptr;
- else
- event_queue.last_event->next_event = event_ptr;
- event_queue.last_event = event_ptr;
+void
+initialize_event_loop (void)
+{
+ event_queue = QUEUE_alloc (gdb_event_p, gdb_event_xfree);
}
/* Process one event. If an event was processed, 1 is returned
static int
process_event (void)
{
- gdb_event *event_ptr, *prev_ptr;
- event_handler_func *proc;
- gdb_fildes_t fd;
-
- /* Look in the event queue to find an event that is ready
- to be processed. */
-
- for (event_ptr = event_queue.first_event;
- event_ptr != NULL;
- event_ptr = event_ptr->next_event)
+ /* Let's get rid of the event from the event queue. We need to
+ do this now because while processing the event, since the
+ proc function could end up jumping out to the caller of this
+ function. In that case, we would have on the event queue an
+ event which has been processed, but not deleted. */
+ if (!QUEUE_is_empty (gdb_event_p, event_queue))
{
- /* Call the handler for the event. */
-
- proc = event_ptr->proc;
- fd = event_ptr->fd;
-
- /* Let's get rid of the event from the event queue. We need to
- do this now because while processing the event, since the
- proc function could end up jumping out to the caller of this
- function. In that case, we would have on the event queue an
- event which has been processed, but not deleted. */
-
- if (event_queue.first_event == event_ptr)
- {
- event_queue.first_event = event_ptr->next_event;
- if (event_ptr->next_event == NULL)
- event_queue.last_event = NULL;
- }
- else
- {
- prev_ptr = event_queue.first_event;
- while (prev_ptr->next_event != event_ptr)
- prev_ptr = prev_ptr->next_event;
-
- prev_ptr->next_event = event_ptr->next_event;
- if (event_ptr->next_event == NULL)
- event_queue.last_event = prev_ptr;
- }
- free (event_ptr);
+ gdb_event *event_ptr = QUEUE_deque (gdb_event_p, event_queue);
+ event_handler_func *proc = event_ptr->proc;
+ gdb_fildes_t fd = event_ptr->fd;
+ gdb_event_xfree (event_ptr);
/* Now call the procedure associated with the event. */
if ((*proc) (fd))
return -1;
if (event_ptr != NULL)
{
callback_handler_func *proc = event_ptr->proc;
- gdb_client_data *data = event_ptr->data;
+ gdb_client_data data = event_ptr->data;
/* Remove the event before calling PROC,
more events may get added by PROC. */
wait_for_event (void)
{
file_handler *file_ptr;
- gdb_event *file_event_ptr;
int num_found = 0;
/* Make sure all output is done before getting another event. */
if (file_ptr->ready_mask == 0)
{
- file_event_ptr = create_file_event (file_ptr->fd);
- async_queue_event (file_event_ptr);
+ gdb_event *file_event_ptr = create_file_event (file_ptr->fd);
+
+ QUEUE_enque (gdb_event_p, event_queue, file_event_ptr);
}
file_ptr->ready_mask = mask;
}
projects / deliverable / binutils-gdb.git / blobdiff