diff options
Diffstat (limited to 'gdb/event-loop.c')
| -rw-r--r-- | gdb/event-loop.c | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/gdb/event-loop.c b/gdb/event-loop.c index 0e1cb2b..052d535 100644 --- a/gdb/event-loop.c +++ b/gdb/event-loop.c @@ -21,6 +21,7 @@ #include "event-loop.h" #include "event-top.h" #include "queue.h" +#include "ser-event.h" #ifdef HAVE_POLL #if defined (HAVE_POLL_H) @@ -262,6 +263,28 @@ static int update_wait_timeout (void); static int poll_timers (void); +/* This event is signalled whenever an asynchronous handler needs to + defer an action to the event loop. */ +static struct serial_event *async_signal_handlers_serial_event; + +/* Callback registered with ASYNC_SIGNAL_HANDLERS_SERIAL_EVENT. */ + +static void +async_signals_handler (int error, gdb_client_data client_data) +{ + /* Do nothing. Handlers are run by invoke_async_signal_handlers + from instead. */ +} + +void +initialize_async_signal_handlers (void) +{ + async_signal_handlers_serial_event = make_serial_event (); + + add_file_handler (serial_event_fd (async_signal_handlers_serial_event), + async_signals_handler, NULL); +} + /* 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 >0 if something was done otherwise returns <0 (this @@ -905,6 +928,7 @@ void mark_async_signal_handler (async_signal_handler * async_handler_ptr) { async_handler_ptr->ready = 1; + serial_event_set (async_signal_handlers_serial_event); } /* See event-loop.h. */ @@ -925,13 +949,19 @@ async_signal_handler_is_marked (async_signal_handler *async_handler_ptr) /* 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; - /* Invoke ready handlers. */ + /* We're going to handle all pending signals, so no need to wake up + the event loop again the next time around. Note this must be + cleared _before_ calling the callbacks, to avoid races. */ + serial_event_clear (async_signal_handlers_serial_event); + + /* Invoke all ready handlers. */ while (1) { |