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35 lines
1.1 KiB
35 lines
1.1 KiB
7 years ago
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#include <wlr/util/signal.h>
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static void handle_noop(struct wl_listener *listener, void *data) {
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// Do nothing
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}
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void wlr_signal_emit_safe(struct wl_signal *signal, void *data) {
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struct wl_listener cursor;
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struct wl_listener end;
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/* Add two special markers: one cursor and one end marker. This way, we know
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* that we've already called listeners on the left of the cursor and that we
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* don't want to call listeners on the right of the end marker. The 'it'
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* function can remove any element it wants from the list without troubles.
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* wl_list_for_each_safe tries to be safe but it fails: it works fine
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* if the current item is removed, but not if the next one is. */
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wl_list_insert(&signal->listener_list, &cursor.link);
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cursor.notify = handle_noop;
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wl_list_insert(signal->listener_list.prev, &end.link);
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end.notify = handle_noop;
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while (cursor.link.next != &end.link) {
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struct wl_list *pos = cursor.link.next;
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struct wl_listener *l = wl_container_of(pos, l, link);
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wl_list_remove(&cursor.link);
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wl_list_insert(pos, &cursor.link);
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l->notify(l, data);
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}
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wl_list_remove(&cursor.link);
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wl_list_remove(&end.link);
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}
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