diff options
Diffstat (limited to 'gdb/event-loop.h')
| -rw-r--r-- | gdb/event-loop.h | 190 |
1 files changed, 14 insertions, 176 deletions
diff --git a/gdb/event-loop.h b/gdb/event-loop.h index baebccd..ffb0123 100644 --- a/gdb/event-loop.h +++ b/gdb/event-loop.h @@ -58,62 +58,10 @@ Corollary tasks are the creation and deletion of event sources. */ typedef PTR gdb_client_data; -typedef struct gdb_event gdb_event; - -typedef void (handler_func) PARAMS ((gdb_client_data)); -typedef void (event_handler_func) PARAMS ((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 adn 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. */ - 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 */ - handler_func *proc; /* Function to call to do the work */ - gdb_client_data client_data; /* Argument to async_handler_func */ - } -async_signal_handler; +struct async_signal_handler; +typedef void (handler_func) (int, int, gdb_client_data); +typedef void (sig_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. */ typedef enum @@ -134,129 +82,19 @@ queue_position; #define GDB_WRITABLE (1<<2) #define GDB_EXCEPTION (1<<3) -/* Type of the mask arguments to select. */ - -#ifndef NO_FD_SET -#define SELECT_MASK fd_set -#else -#ifndef _AIX -typedef long fd_mask; -#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 - - -/* 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) - - -/* Stack for prompts. Each prompt is composed as a prefix, a prompt - and a suffix. The prompt to be displayed at any given time is the - one on top of the stack. A stack is necessary because of cases in - which the execution of a gdb command requires further input from - the user, like for instance 'commands' for breakpoints and - 'actions' for tracepoints. In these cases, the prompt is '>' and - gdb should process input using the asynchronous readline interface - and the event loop. In order to achieve this, we need to save - somewhere the state of GDB, i.e. that it is processing user input - as part of a command and not as part of the top level command loop. - The prompt stack represents part of the saved state. Another part - would be the function that readline would invoke after a whole line - of input has ben entered. This second piece would be something - like, for instance, where to return within the code for the actions - commands after a line has been read. This latter portion has not - beeen implemented yet. The need for a 3-part prompt arises from - the annotation level. When this is set to 2, the prompt is actually - composed of a prefix, the prompt itself and a suffix. */ - -/* At any particular time there will be always at least one prompt on - the stack, the one being currently displayed by gdb. If gdb is - using annotation level equal 2, there will be 2 prompts on the - stack: the usual one, w/o prefix and suffix (at top - 1), and the - 'composite' one with prefix and suffix added (at top). At this - time, this is the only use of the prompt stack. Resetting annotate - to 0 or 1, pops the top of the stack, resetting its size to one - element. The MAXPROMPTS limit is safe, for now. Once other cases - are dealt with (like the different prompts used for 'commands' or - 'actions') this array implementation of the prompt stack may have - to change. */ - -#define MAXPROMPTS 10 -struct prompts - { - struct - { - char *prefix; - char *prompt; - char *suffix; - } - prompt_stack[MAXPROMPTS]; - int top; - }; - -#define PROMPT(X) the_prompts.prompt_stack[the_prompts.top + X].prompt -#define PREFIX(X) the_prompts.prompt_stack[the_prompts.top + X].prefix -#define SUFFIX(X) the_prompts.prompt_stack[the_prompts.top + X].suffix - /* Exported functions from event-loop.c */ -extern void start_event_loop PARAMS ((void)); -extern void delete_file_handler PARAMS ((int)); -extern void add_file_handler PARAMS ((int, void (*) (void), gdb_client_data)); -extern void mark_async_signal_handler PARAMS ((async_signal_handler *)); -extern async_signal_handler * - create_async_signal_handler PARAMS ((handler_func *, gdb_client_data)); -extern void delete_async_signal_handler PARAMS ((async_signal_handler ** async_handler_ptr)); -extern gdb_event *create_file_event PARAMS ((int)); +extern void start_event_loop (void); +extern void delete_file_handler (int fd); +extern void add_file_handler (int fd, handler_func *proc, gdb_client_data client_data); +extern void mark_async_signal_handler (struct async_signal_handler *async_handler_ptr); +extern struct async_signal_handler * + create_async_signal_handler (sig_handler_func *proc, gdb_client_data client_data); +extern void delete_async_signal_handler (struct async_signal_handler ** async_handler_ptr); +extern void inferior_event_handler (int error, gdb_client_data client_data, int fd); +extern int create_timer (int milliseconds, timer_handler_func *proc, gdb_client_data client_data); +extern void delete_timer (int id); -/* Exported functions from event-top.c. - FIXME: these should really go into top.h. */ -extern void display_gdb_prompt PARAMS ((char *)); -extern void async_init_signals PARAMS ((void)); -extern void set_async_editing_command PARAMS ((char *, int, struct cmd_list_element *)); -extern void set_async_annotation_level PARAMS ((char *, int, struct cmd_list_element *)); -extern void set_async_prompt PARAMS ((char *, int, struct cmd_list_element *)); -extern void handle_stop_sig PARAMS ((int)); -extern void handle_sigint PARAMS ((int)); -extern void pop_prompt PARAMS ((void)); -extern void push_prompt PARAMS ((char *, char *, char *)); -extern void gdb_readline2 PARAMS ((void)); -extern void mark_async_signal_handler_wrapper (void *); -extern void async_request_quit (gdb_client_data); -/* Exported variables from event-top.c. - FIXME: these should really go into top.h. */ -extern int async_command_editing_p; -extern int exec_done_display_p; -extern char *async_annotation_suffix; -extern char *new_async_prompt; -extern struct prompts the_prompts; -extern void (*call_readline) PARAMS ((void)); -extern void (*input_handler) PARAMS ((char *)); -extern int input_fd; |