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https://gitlab.freedesktop.org/wayland/weston
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libweston: remove wlr_signal_emit_safe
Signed-off-by: He Yong <hyyoxhk@163.com>
This commit is contained in:
He Yong
Marius Vlad
parent
98606d6a03
commit
903b6b9336
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@ -1,14 +1,12 @@
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srcs_libshared = [
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'config-parser.c',
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'option-parser.c',
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'signal.c',
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'file-util.c',
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'os-compatibility.c',
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'process-util.c',
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'hash.c',
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]
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deps_libshared = [dep_wayland_client, dep_wayland_server,
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dep_pixman, deps_for_libweston_users]
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deps_libshared = [dep_wayland_client, dep_pixman, deps_for_libweston_users]
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lib_libshared = static_library(
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'shared',
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@ -1,67 +0,0 @@
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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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@ -1,53 +0,0 @@
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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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#ifndef WESTON_SIGNAL_H
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#define WESTON_SIGNAL_H
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#include <wayland-server-core.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* A safer version of wl_signal_emit() which can gracefully handle additions
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* and deletions of any signal listener from within listener notification
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* callbacks.
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*
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* Listeners deleted during a signal emission and which have not already been
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* notified at the time of deletion are not notified by that emission.
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*
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* Listeners added (or readded) during signal emission are ignored by that
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* emission.
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*
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* Note that repurposing a listener without explicitly removing it and readding
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* it is not supported and can lead to unexpected behavior.
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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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#ifdef __cplusplus
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}
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#endif
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#endif /* WESTON_SIGNAL_H */
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