weston/shared/signal.h

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/*
* Copyright 2018 Simon Ser
* Copyright 2021 Collabora, Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef WESTON_SIGNAL_H
#define WESTON_SIGNAL_H
#include <wayland-server-core.h>
#ifdef __cplusplus
extern "C" {
#endif
/* A safer version of wl_signal_emit() which can gracefully handle additions
* and deletions of any signal listener from within listener notification
* callbacks.
*
* Listeners deleted during a signal emission and which have not already been
* notified at the time of deletion are not notified by that emission.
*
* Listeners added (or readded) during signal emission are ignored by that
* emission.
*
* Note that repurposing a listener without explicitly removing it and readding
* it is not supported and can lead to unexpected behavior.
*/
void
weston_signal_emit_mutable(struct wl_signal *signal, void *data);
#ifdef __cplusplus
}
#endif
#endif /* WESTON_SIGNAL_H */