* event-loop.h: Mention async_event_handlers.
(async_event_handler): Forward declare. (async_event_handler_func): New typedef. (create_async_event_handler, delete_async_event_handler) (mark_async_event_handler): Declare. * event-loop.c (event_data): New. (event_handler_func): Take an event_data instead of an integer. (struct gdb_event): Replace the integer file descriptor by a generic event_data. (async_event_handler): New. (async_handler_ready): Delete. (async_event_handler_list): New. (create_event): New. (create_file_event): Use it. (process_event): Adjust. (gdb_do_one_event): Poll from the event sources in round-robin fashion across calls. Be sure to consult all sources before blocking. (handle_file_event): Take an event_data instead of an integer. Adjust. (gdb_wait_for_event): Add `block' argument. Handle it. (mark_async_signal_handler): Remove unneeded cast. (invoke_async_signal_handler): Rename to ... (invoke_async_signal_handlres): ... this. Return true if any was handled. (check_async_ready): Delete (create_async_event_handler): New. (mark_async_event_handler): New. (struct async_event_handler_data): New. (invoke_async_event_handler): New. (check_async_event_handlers): New. (delete_async_event_handler): New. (handle_timer_event): Adjust.
This commit is contained in:
Pedro Alves
parent
ed16377505
commit
50d0174816
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@ -1,3 +1,39 @@
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2008-10-24 Pedro Alves <pedro@codesourcery.com>
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* event-loop.h: Mention async_event_handlers.
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(async_event_handler): Forward declare.
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(async_event_handler_func): New typedef.
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(create_async_event_handler, delete_async_event_handler)
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(mark_async_event_handler): Declare.
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* event-loop.c (event_data): New.
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(event_handler_func): Take an event_data instead of an integer.
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(struct gdb_event): Replace the integer file descriptor by a
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generic event_data.
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(async_event_handler): New.
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(async_handler_ready): Delete.
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(async_event_handler_list): New.
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(create_event): New.
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(create_file_event): Use it.
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(process_event): Adjust.
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(gdb_do_one_event): Poll from the event sources in round-robin
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fashion across calls. Be sure to consult all sources before
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blocking.
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(handle_file_event): Take an event_data instead of an integer.
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Adjust.
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(gdb_wait_for_event): Add `block' argument. Handle it.
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(mark_async_signal_handler): Remove unneeded cast.
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(invoke_async_signal_handler): Rename to ...
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(invoke_async_signal_handlres): ... this. Return true if any was
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handled.
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(check_async_ready): Delete
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(create_async_event_handler): New.
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(mark_async_event_handler): New.
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(struct async_event_handler_data): New.
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(invoke_async_event_handler): New.
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(check_async_event_handlers): New.
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(delete_async_event_handler): New.
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(handle_timer_event): Adjust.
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2008-10-24 Doug Evans <dje@google.com>
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* dwarf2read.c (typename_concat): Don't segv if prefix or suffix
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386
gdb/event-loop.c
386
gdb/event-loop.c
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@ -38,25 +38,40 @@
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#include "gdb_assert.h"
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#include "gdb_select.h"
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/* Data point to pass to the event handler. */
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typedef union event_data
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{
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void *ptr;
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int integer;
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} event_data;
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typedef struct gdb_event gdb_event;
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typedef void (event_handler_func) (int);
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typedef void (event_handler_func) (event_data);
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/* Event for the GDB event system. Events are queued by calling
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async_queue_event and serviced later on by gdb_do_one_event. An
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event can be, for instance, a file descriptor becoming ready to be
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read. Servicing an event simply means that the procedure PROC will
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read. Servicing an event simply means that the procedure PROC will
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be called. We have 2 queues, one for file handlers that we listen
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to in the event loop, and one for the file handlers+events that are
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ready. The procedure PROC associated with each event is always the
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same (handle_file_event). Its duty is to invoke the handler
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associated with the file descriptor whose state change generated
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the event, plus doing other cleanups and such. */
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ready. The procedure PROC associated with each event is dependant
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of the event source. In the case of monitored file descriptors, it
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is always the same (handle_file_event). Its duty is to invoke the
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handler associated with the file descriptor whose state change
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generated the event, plus doing other cleanups and such. In the
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case of async signal handlers, it is
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invoke_async_signal_handler. */
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struct gdb_event
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{
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event_handler_func *proc; /* Procedure to call to service this event. */
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int fd; /* File descriptor that is ready. */
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struct gdb_event *next_event; /* Next in list of events or NULL. */
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/* Procedure to call to service this event. */
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event_handler_func *proc;
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/* Data to pass to the event handler. */
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event_data data;
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/* Next in list of events or NULL. */
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struct gdb_event *next_event;
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};
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/* Information about each file descriptor we register with the event
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@ -82,7 +97,7 @@ file_handler;
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be carried out by PROC at a later time, within process_event. This
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provides a deferred execution of signal handlers.
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Async_init_signals takes care of setting up such an
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asyn_signal_handler for each interesting signal. */
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async_signal_handler for each interesting signal. */
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typedef struct async_signal_handler
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{
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int ready; /* If ready, call this handler from the main event loop,
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@ -93,6 +108,29 @@ typedef struct async_signal_handler
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}
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async_signal_handler;
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/* PROC is a function to be invoked when the READY flag is set. This
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happens when the event has been marked with
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MARK_ASYNC_EVENT_HANDLER. The actual work to be done in response
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to an event will be carried out by PROC at a later time, within
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process_event. This provides a deferred execution of event
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handlers. */
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typedef struct async_event_handler
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{
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/* If ready, call this handler from the main event loop, using
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invoke_event_handler. */
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int ready;
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/* Point to next handler. */
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struct async_event_handler *next_handler;
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/* Function to call to do the work. */
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async_event_handler_func *proc;
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/* Argument to PROC. */
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gdb_client_data client_data;
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}
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async_event_handler;
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/* Event queue:
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- the first event in the queue is the head of the queue.
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@ -207,21 +245,25 @@ static struct
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}
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sighandler_list;
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/* Are any of the handlers ready? Check this variable using
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check_async_ready. This is used by process_event, to determine
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whether or not to invoke the invoke_async_signal_handler
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function. */
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static int async_handler_ready = 0;
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/* All the async_event_handlers gdb is interested in are kept onto
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this list. */
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static struct
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{
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/* Pointer to first in handler list. */
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async_event_handler *first_handler;
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static void create_file_handler (int fd, int mask, handler_func * proc, gdb_client_data client_data);
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static void invoke_async_signal_handler (void);
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static void handle_file_event (int event_file_desc);
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static int gdb_wait_for_event (void);
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static int check_async_ready (void);
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static void async_queue_event (gdb_event * event_ptr, queue_position position);
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static gdb_event *create_file_event (int fd);
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static int process_event (void);
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static void handle_timer_event (int dummy);
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/* Pointer to last in handler list. */
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async_event_handler *last_handler;
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}
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async_event_handler_list;
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static int invoke_async_signal_handlers (void);
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static void create_file_handler (int fd, int mask, handler_func *proc,
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gdb_client_data client_data);
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static void handle_file_event (event_data data);
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static void check_async_event_handlers (void);
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static void check_async_signal_handlers (void);
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static int gdb_wait_for_event (int);
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static void poll_timers (void);
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@ -260,6 +302,22 @@ async_queue_event (gdb_event * event_ptr, queue_position position)
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}
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}
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/* Create a generic event, to be enqueued in the event queue for
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processing. PROC is the procedure associated to the event. DATA
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is passed to PROC upon PROC invocation. */
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static gdb_event *
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create_event (event_handler_func proc, event_data data)
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{
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gdb_event *event;
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event = xmalloc (sizeof (*event));
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event->proc = proc;
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event->data = data;
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return event;
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}
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/* Create a file event, to be enqueued in the event queue for
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processing. The procedure associated to this event is always
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handle_file_event, which will in turn invoke the one that was
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@ -267,12 +325,10 @@ async_queue_event (gdb_event * event_ptr, queue_position position)
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static gdb_event *
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create_file_event (int fd)
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{
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gdb_event *file_event_ptr;
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event_data data;
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file_event_ptr = (gdb_event *) xmalloc (sizeof (gdb_event));
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file_event_ptr->proc = handle_file_event;
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file_event_ptr->fd = fd;
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return (file_event_ptr);
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data.integer = fd;
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return create_event (handle_file_event, data);
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}
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/* Process one event.
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@ -280,7 +336,7 @@ create_file_event (int fd)
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or an asynchronous event handler can be invoked in response to
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the reception of a signal.
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If an event was processed (either way), 1 is returned otherwise
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0 is returned.
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0 is returned.
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Scan the queue from head to tail, processing therefore the high
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priority events first, by invoking the associated event handler
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procedure. */
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@ -289,17 +345,14 @@ process_event (void)
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{
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gdb_event *event_ptr, *prev_ptr;
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event_handler_func *proc;
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int fd;
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event_data data;
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/* First let's see if there are any asynchronous event handlers that
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are ready. These would be the result of invoking any of the
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signal handlers. */
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if (check_async_ready ())
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{
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invoke_async_signal_handler ();
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return 1;
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}
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if (invoke_async_signal_handlers ())
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return 1;
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/* Look in the event queue to find an event that is ready
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to be processed. */
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@ -310,7 +363,7 @@ process_event (void)
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/* Call the handler for the event. */
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proc = event_ptr->proc;
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fd = event_ptr->fd;
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data = event_ptr->data;
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/* Let's get rid of the event from the event queue. We need to
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do this now because while processing the event, the proc
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@ -338,7 +391,7 @@ process_event (void)
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xfree (event_ptr);
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/* Now call the procedure associated with the event. */
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(*proc) (fd);
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(*proc) (data);
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return 1;
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}
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@ -355,33 +408,59 @@ process_event (void)
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int
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gdb_do_one_event (void *data)
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{
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/* Any events already waiting in the queue? */
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static int event_source_head = 0;
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const int number_of_sources = 3;
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int current = 0;
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/* Any events already waiting in the queue? */
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if (process_event ())
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return 1;
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/* To level the fairness across event sources, we poll them in a
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round-robin fashion. */
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for (current = 0; current < number_of_sources; current++)
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{
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return 1;
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switch (event_source_head)
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{
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case 0:
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/* Are any timers that are ready? If so, put an event on the
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queue. */
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poll_timers ();
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break;
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case 1:
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/* Are there events already waiting to be collected on the
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monitored file descriptors? */
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gdb_wait_for_event (0);
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break;
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case 2:
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/* Are there any asynchronous event handlers ready? */
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check_async_event_handlers ();
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break;
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}
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event_source_head++;
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if (event_source_head == number_of_sources)
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event_source_head = 0;
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}
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/* Are any timers that are ready? If so, put an event on the queue. */
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poll_timers ();
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/* Wait for a new event. If gdb_wait_for_event returns -1,
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we should get out because this means that there are no
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event sources left. This will make the event loop stop,
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and the application exit. */
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if (gdb_wait_for_event () < 0)
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{
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return -1;
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}
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/* Handle any new events occurred while waiting. */
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/* Handle any new events collected. */
|
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if (process_event ())
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{
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return 1;
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}
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return 1;
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|
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/* If gdb_wait_for_event has returned 1, it means that one
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event has been handled. We break out of the loop. */
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/* Block waiting for a new event. If gdb_wait_for_event returns -1,
|
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we should get out because this means that there are no event
|
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sources left. This will make the event loop stop, and the
|
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application exit. */
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if (gdb_wait_for_event (1) < 0)
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return -1;
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/* Handle any new events occurred while waiting. */
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if (process_event ())
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return 1;
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|
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/* If gdb_wait_for_event has returned 1, it means that one event has
|
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been handled. We break out of the loop. */
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return 1;
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}
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|
|
@ -659,7 +738,7 @@ delete_file_handler (int fd)
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through event_ptr->proc. EVENT_FILE_DESC is file descriptor of the
|
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event in the front of the event queue. */
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static void
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handle_file_event (int event_file_desc)
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handle_file_event (event_data data)
|
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{
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file_handler *file_ptr;
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int mask;
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|
|
@ -667,6 +746,7 @@ handle_file_event (int event_file_desc)
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int error_mask;
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int error_mask_returned;
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#endif
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int event_file_desc = data.integer;
|
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|
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/* Search the file handler list to find one that matches the fd in
|
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the event. */
|
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|
|
@ -735,15 +815,13 @@ handle_file_event (int event_file_desc)
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|||
}
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}
|
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|
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/* Called by gdb_do_one_event to wait for new events on the
|
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monitored file descriptors. Queue file events as they are
|
||||
detected by the poll.
|
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If there are no events, this function will block in the
|
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call to poll.
|
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Return -1 if there are no files descriptors to monitor,
|
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otherwise return 0. */
|
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/* Called by gdb_do_one_event to wait for new events on the monitored
|
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file descriptors. Queue file events as they are detected by the
|
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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
|
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descriptors to monitor, otherwise return 0. */
|
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static int
|
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gdb_wait_for_event (void)
|
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gdb_wait_for_event (int block)
|
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{
|
||||
file_handler *file_ptr;
|
||||
gdb_event *file_event_ptr;
|
||||
|
|
@ -760,13 +838,18 @@ gdb_wait_for_event (void)
|
|||
if (use_poll)
|
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{
|
||||
#ifdef HAVE_POLL
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num_found =
|
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poll (gdb_notifier.poll_fds,
|
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(unsigned long) gdb_notifier.num_fds,
|
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gdb_notifier.timeout_valid ? gdb_notifier.poll_timeout : -1);
|
||||
int timeout;
|
||||
|
||||
if (block)
|
||||
timeout = gdb_notifier.timeout_valid ? gdb_notifier.poll_timeout : -1;
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else
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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. */
|
||||
signal. */
|
||||
if (num_found == -1 && errno != EINTR)
|
||||
perror_with_name (("poll"));
|
||||
#else
|
||||
|
|
@ -776,6 +859,18 @@ gdb_wait_for_event (void)
|
|||
}
|
||||
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];
|
||||
|
|
@ -783,8 +878,7 @@ gdb_wait_for_event (void)
|
|||
&gdb_notifier.ready_masks[0],
|
||||
&gdb_notifier.ready_masks[1],
|
||||
&gdb_notifier.ready_masks[2],
|
||||
gdb_notifier.timeout_valid
|
||||
? &gdb_notifier.select_timeout : NULL);
|
||||
timeout_p);
|
||||
|
||||
/* Clear the masks after an error from select. */
|
||||
if (num_found == -1)
|
||||
|
|
@ -792,7 +886,9 @@ gdb_wait_for_event (void)
|
|||
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. */
|
||||
|
||||
/* Dont print anything if we got a signal, let gdb handle
|
||||
it. */
|
||||
if (errno != EINTR)
|
||||
perror_with_name (("select"));
|
||||
}
|
||||
|
|
@ -911,21 +1007,18 @@ call_async_signal_handler (struct async_signal_handler *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)
|
||||
{
|
||||
|
|
@ -938,11 +1031,12 @@ invoke_async_signal_handler (void)
|
|||
}
|
||||
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).
|
||||
|
|
@ -971,11 +1065,111 @@ delete_async_signal_handler (async_signal_handler ** 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
|
||||
|
|
@ -1080,11 +1274,11 @@ delete_timer (int id)
|
|||
}
|
||||
|
||||
/* 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;
|
||||
|
|
@ -1150,7 +1344,7 @@ poll_timers (void)
|
|||
{
|
||||
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);
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -24,21 +24,33 @@
|
|||
sources to listen on. External event sources can be plugged into
|
||||
the loop.
|
||||
|
||||
There are 3 main components:
|
||||
There are 4 main components:
|
||||
- a list of file descriptors to be monitored, GDB_NOTIFIER.
|
||||
- a list of asynchronous event sources to be monitored,
|
||||
ASYNC_EVENT_HANDLER_LIST.
|
||||
- a list of events that have occurred, EVENT_QUEUE.
|
||||
- a list of signal handling functions, SIGHANDLER_LIST.
|
||||
|
||||
GDB_NOTIFIER keeps track of the event sources. Event sources for
|
||||
gdb are currently the UI and the target. Gdb communicates with the
|
||||
command line user interface via the readline library and usually
|
||||
communicates with remote targets via a serial port. Serial ports
|
||||
are represented in GDB as file descriptors and select/poll calls.
|
||||
For native targets instead, the communication consists of calls to
|
||||
ptrace and waits (via signals) or calls to poll/select (via file
|
||||
descriptors). In the current gdb, the code handling events related
|
||||
to the target resides in the wait_for_inferior function and in
|
||||
various target specific files (*-tdep.c).
|
||||
GDB_NOTIFIER keeps track of the file descriptor based event
|
||||
sources. ASYNC_EVENT_HANDLER_LIST keeps track of asynchronous
|
||||
event sources that are signalled by some component of gdb, usually
|
||||
a target_ops instance. Event sources for gdb are currently the UI
|
||||
and the target. Gdb communicates with the command line user
|
||||
interface via the readline library and usually communicates with
|
||||
remote targets via a serial port. Serial ports are represented in
|
||||
GDB as file descriptors and select/poll calls. For native targets
|
||||
instead, the communication varies across operating system debug
|
||||
APIs, but usually consists of calls to ptrace and waits (via
|
||||
signals) or calls to poll/select (via file descriptors). In the
|
||||
current gdb, the code handling events related to the target resides
|
||||
in wait_for_inferior for synchronous targets; or, for asynchronous
|
||||
capable targets, by having the target register either a target
|
||||
controlled file descriptor and/or an asynchronous event source in
|
||||
the event loop, with the fetch_inferior_event function as the event
|
||||
callback. In both the synchronous and asynchronous cases, usually
|
||||
the target event is collected through the target_wait interface.
|
||||
The target is free to install other event sources in the event loop
|
||||
if it so requires.
|
||||
|
||||
EVENT_QUEUE keeps track of the events that have happened during the
|
||||
last iteration of the event loop, and need to be processed. An
|
||||
|
|
@ -57,8 +69,10 @@
|
|||
|
||||
typedef void *gdb_client_data;
|
||||
struct async_signal_handler;
|
||||
struct async_event_handler;
|
||||
typedef void (handler_func) (int, gdb_client_data);
|
||||
typedef void (sig_handler_func) (gdb_client_data);
|
||||
typedef void (async_event_handler_func) (gdb_client_data);
|
||||
typedef void (timer_handler_func) (gdb_client_data);
|
||||
|
||||
/* Where to add an event onto the event queue, by queue_event. */
|
||||
|
|
@ -113,3 +127,21 @@ void mark_async_signal_handler (struct async_signal_handler *handler);
|
|||
|
||||
void gdb_call_async_signal_handler (struct async_signal_handler *handler,
|
||||
int immediate_p);
|
||||
|
||||
/* Create and register an asynchronous event source in the event loop,
|
||||
and set PROC as its callback. CLIENT_DATA is passed as argument to
|
||||
PROC upon its invocation. Returns a pointer to an opaque structure
|
||||
used to mark as ready and to later delete this event source from
|
||||
the event loop. */
|
||||
extern struct async_event_handler *
|
||||
create_async_event_handler (async_event_handler_func *proc,
|
||||
gdb_client_data client_data);
|
||||
|
||||
/* Remove the event source pointed by HANDLER_PTR created by
|
||||
CREATE_ASYNC_EVENT_HANDLER from the event loop, and release it. */
|
||||
extern void
|
||||
delete_async_event_handler (struct async_event_handler **handler_ptr);
|
||||
|
||||
/* Call the handler from HANDLER the next time through the event
|
||||
loop. */
|
||||
extern void mark_async_event_handler (struct async_event_handler *handler);
|
||||
|
|
|
|||
Loading…
Reference in New Issue