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server: introduce wl_signal_emit_mutable

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wl_signal_emit doesn't handle well situations where a listener removes
another listener. This can happen in practice: wlroots and Weston [1]
both have private helpers to workaround this defect.

wl_signal_emit can't be fixed without breaking the API. Instead,
introduce a new function. Callers need to make sure to always remove
listeners when they are free'd.

[1]: https://gitlab.freedesktop.org/wayland/weston/-/merge_requests/457

Signed-off-by: Simon Ser <contact@emersion.fr>
Signed-off-by: Alexandros Frantzis <alexandros.frantzis@collabora.com>
This commit is contained in:
Simon Ser 2022-01-31 23:09:26 +01:00
parent 868eb99eb0
commit 962aefda42
3 changed files with 107 additions and 0 deletions
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3
src/wayland-server-core.h
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@ -481,6 +481,9 @@ wl_signal_emit(struct wl_signal *signal, void *data)
l->notify(l, data);
}
void
wl_signal_emit_mutable(struct wl_signal *signal, void *data);
typedef void (*wl_resource_destroy_func_t)(struct wl_resource *resource);
/*