68 lines
2.3 KiB
C
68 lines
2.3 KiB
C
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/*
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* Copyright 2018 Simon Ser
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* Copyright 2021 Collabora, Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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/* Implementation copied from wlroots util/signal.c file */
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#include "signal.h"
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static void
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handle_noop(struct wl_listener *listener, void *data)
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{
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/* Do nothing */
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}
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void
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weston_signal_emit_mutable(struct wl_signal *signal, void *data)
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{
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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
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* know that we've already called listeners on the left of the cursor
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* and that we don't want to call listeners on the right of the end
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* marker. The 'it' function can remove any element it wants from the
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* list without troubles.
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*
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* There was a previous attempt that used to steal the whole list of
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* listeners but then that broke wl_signal_get().
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*
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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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