}
static void gdb_wants_all_threads_stopped (void);
+static void resume (struct thread_resume *actions, size_t n);
+
+/* Call CALLBACK for any thread to which ACTIONS applies to. Returns
+ true if CALLBACK returns true. Returns false if no matching thread
+ is found or CALLBACK results false. */
+
+static int
+visit_actioned_threads (const struct thread_resume *actions,
+ size_t num_actions,
+ int (*callback) (const struct thread_resume *,
+ struct thread_info *))
+{
+ struct inferior_list_entry *entry;
+
+ for (entry = all_threads.head; entry != NULL; entry = entry->next)
+ {
+ size_t i;
+
+ for (i = 0; i < num_actions; i++)
+ {
+ const struct thread_resume *action = &actions[i];
+
+ if (ptid_equal (action->thread, minus_one_ptid)
+ || ptid_equal (action->thread, entry->id)
+ || ((ptid_get_pid (action->thread)
+ == ptid_get_pid (entry->id))
+ && ptid_get_lwp (action->thread) == -1))
+ {
+ struct thread_info *thread = (struct thread_info *) entry;
+
+ if ((*callback) (action, thread))
+ return 1;
+ }
+ }
+ }
+
+ return 0;
+}
+
+/* Callback for visit_actioned_threads. If the thread has a pending
+ status to report, report it now. */
+
+static int
+handle_pending_status (const struct thread_resume *resumption,
+ struct thread_info *thread)
+{
+ if (thread->status_pending_p)
+ {
+ thread->status_pending_p = 0;
+
+ last_status = thread->last_status;
+ last_ptid = thread->entry.id;
+ prepare_resume_reply (own_buf, last_ptid, &last_status);
+ return 1;
+ }
+ return 0;
+}
/* Parse vCont packets. */
void
cont_thread = minus_one_ptid;
set_desired_inferior (0);
+ resume (resume_info, n);
+ free (resume_info);
+ return;
+
+err:
+ write_enn (own_buf);
+ free (resume_info);
+ return;
+}
+
+/* Resume target with ACTIONS, an array of NUM_ACTIONS elements. */
+
+static void
+resume (struct thread_resume *actions, size_t num_actions)
+{
if (!non_stop)
- enable_async_io ();
+ {
+ /* Check if among the threads that GDB wants actioned, there's
+ one with a pending status to report. If so, skip actually
+ resuming/stopping and report the pending event
+ immediately. */
+ if (visit_actioned_threads (actions, num_actions, handle_pending_status))
+ return;
- (*the_target->resume) (resume_info, n);
+ enable_async_io ();
+ }
- free (resume_info);
+ (*the_target->resume) (actions, num_actions);
if (non_stop)
write_ok (own_buf);
|| last_status.kind == TARGET_WAITKIND_SIGNALLED)
mourn_inferior (find_process_pid (ptid_get_pid (last_ptid)));
}
- return;
-
-err:
- write_enn (own_buf);
- free (resume_info);
- return;
}
/* Attach to a new program. Return 1 if successful, 0 if failure. */
n++;
}
- if (!non_stop)
- enable_async_io ();
-
- (*the_target->resume) (resume_info, n);
-
- if (non_stop)
- write_ok (own_buf);
- else
- {
- last_ptid = mywait (minus_one_ptid, &last_status, 0, 1);
-
- if (last_status.kind != TARGET_WAITKIND_EXITED
- && last_status.kind != TARGET_WAITKIND_SIGNALLED)
- {
- current_inferior->last_resume_kind = resume_stop;
- current_inferior->last_status = last_status;
- }
-
- prepare_resume_reply (own_buf, last_ptid, &last_status);
- disable_async_io ();
-
- if (last_status.kind == TARGET_WAITKIND_EXITED
- || last_status.kind == TARGET_WAITKIND_SIGNALLED)
- mourn_inferior (find_process_pid (ptid_get_pid (last_ptid)));
- }
+ resume (resume_info, n);
}
/* Callback for for_each_inferior. Make a new stop reply for each
process->gdb_detached = 0;
}
+/* Callback for for_each_inferior. Clear the thread's pending status
+ flag. */
+
+static void
+clear_pending_status_callback (struct inferior_list_entry *entry)
+{
+ struct thread_info *thread = (struct thread_info *) entry;
+
+ thread->status_pending_p = 0;
+}
+
+/* Callback for for_each_inferior. If the thread is stopped with an
+ interesting event, mark it as having a pending event. */
+
+static void
+set_pending_status_callback (struct inferior_list_entry *entry)
+{
+ struct thread_info *thread = (struct thread_info *) entry;
+
+ if (thread->last_status.kind != TARGET_WAITKIND_STOPPED
+ || (thread->last_status.value.sig != GDB_SIGNAL_0
+ /* A breakpoint, watchpoint or finished step from a previous
+ GDB run isn't considered interesting for a new GDB run.
+ If we left those pending, the new GDB could consider them
+ random SIGTRAPs. This leaves out real async traps. We'd
+ have to peek into the (target-specific) siginfo to
+ distinguish those. */
+ && thread->last_status.value.sig != GDB_SIGNAL_TRAP))
+ thread->status_pending_p = 1;
+}
+
+/* Callback for find_inferior. Return true if ENTRY (a thread) has a
+ pending status to report to GDB. */
+
+static int
+find_status_pending_thread_callback (struct inferior_list_entry *entry, void *data)
+{
+ struct thread_info *thread = (struct thread_info *) entry;
+
+ return thread->status_pending_p;
+}
+
/* Status handler for the '?' packet. */
static void
/* GDB is connected, don't forward events to the target anymore. */
for_each_inferior (&all_processes, gdb_reattached_process);
+ discard_queued_stop_replies (-1);
+ for_each_inferior (&all_threads, clear_pending_status_callback);
+
/* In non-stop mode, we must send a stop reply for each stopped
thread. In all-stop mode, just send one for the first stopped
thread we find. */
if (non_stop)
{
- discard_queued_stop_replies (-1);
find_inferior (&all_threads, queue_stop_reply_callback, NULL);
/* The first is sent immediatly. OK is sent if there is no
}
else
{
+ struct inferior_list_entry *thread = NULL;
+
pause_all (0);
stabilize_threads ();
gdb_wants_all_threads_stopped ();
- if (all_threads.head)
- {
- struct target_waitstatus status;
+ /* We can only report one status, but we might be coming out of
+ non-stop -- if more than one thread is stopped with
+ interesting events, leave events for the threads we're not
+ reporting now pending. They'll be reported the next time the
+ threads are resumed. Start by marking all interesting events
+ as pending. */
+ for_each_inferior (&all_threads, set_pending_status_callback);
+
+ /* Prefer the last thread that reported an event to GDB (even if
+ that was a GDB_SIGNAL_TRAP). */
+ if (last_status.kind != TARGET_WAITKIND_IGNORE
+ && last_status.kind != TARGET_WAITKIND_EXITED
+ && last_status.kind != TARGET_WAITKIND_SIGNALLED)
+ thread = find_inferior_id (&all_threads, last_ptid);
+
+ /* If the last event thread is not found for some reason, look
+ for some other thread that might have an event to report. */
+ if (thread == NULL)
+ thread = find_inferior (&all_threads,
+ find_status_pending_thread_callback, NULL);
+
+ /* If we're still out of luck, simply pick the first thread in
+ the thread list. */
+ if (thread == NULL)
+ thread = all_threads.head;
+
+ if (thread != NULL)
+ {
+ struct thread_info *tp = (struct thread_info *) thread;
+
+ /* We're reporting this event, so it's no longer
+ pending. */
+ tp->status_pending_p = 0;
+
+ /* GDB assumes the current thread is the thread we're
+ reporting the status for. */
+ general_thread = thread->id;
+ set_desired_inferior (1);
- status.kind = TARGET_WAITKIND_STOPPED;
- status.value.sig = GDB_SIGNAL_TRAP;
- prepare_resume_reply (own_buf,
- all_threads.head->id, &status);
+ gdb_assert (tp->last_status.kind != TARGET_WAITKIND_IGNORE);
+ prepare_resume_reply (own_buf, tp->entry.id, &tp->last_status);
}
else
strcpy (own_buf, "W00");
projects / thirdparty / binutils-gdb.git / blobdiff