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backend: destroy multi backend when primary backend is

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This makes it easy for compositors to handle situations where the
DRM or libinput backend becomes unavailable. Compositors can listen
the destroy event of the multi backend returned by
wlr_backend_autocreate() and decide what to do.
This commit is contained in:
Simon Ser 2023-11-23 14:53:06 +01:00 committed by Kirill Primak
parent be0b7845f7
commit 4ad6e6c298
2 changed files with 67 additions and 2 deletions
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66
backend/backend.c
View File

@ -146,6 +146,53 @@ static size_t parse_outputs_env(const char *name) {
return outputs;
}
/**
* Helper to destroy the multi backend when one of its nested backends is
* destroyed.
*/
struct wlr_auto_backend_monitor {
struct wlr_backend *multi;
struct wlr_backend *primary;
struct wl_listener multi_destroy;
struct wl_listener primary_destroy;
};
static void auto_backend_monitor_destroy(struct wlr_auto_backend_monitor *monitor) {
wl_list_remove(&monitor->multi_destroy.link);
wl_list_remove(&monitor->primary_destroy.link);
free(monitor);
}
static void monitor_handle_multi_destroy(struct wl_listener *listener, void *data) {
struct wlr_auto_backend_monitor *monitor = wl_container_of(listener, monitor, multi_destroy);
auto_backend_monitor_destroy(monitor);
}
static void monitor_handle_primary_destroy(struct wl_listener *listener, void *data) {
struct wlr_auto_backend_monitor *monitor = wl_container_of(listener, monitor, primary_destroy);
wlr_backend_destroy(monitor->multi);
}
static struct wlr_auto_backend_monitor *auto_backend_monitor_create(
struct wlr_backend *multi, struct wlr_backend *primary) {
struct wlr_auto_backend_monitor *monitor = calloc(1, sizeof(*monitor));
if (monitor == NULL) {
return NULL;
}
monitor->multi = multi;
monitor->primary = primary;
monitor->multi_destroy.notify = monitor_handle_multi_destroy;
wl_signal_add(&multi->events.destroy, &monitor->multi_destroy);
monitor->primary_destroy.notify = monitor_handle_primary_destroy;
wl_signal_add(&primary->events.destroy, &monitor->primary_destroy);
return monitor;
}
static struct wlr_backend *attempt_wl_backend(struct wl_display *display) {
struct wlr_backend *backend = wlr_wl_backend_create(display, NULL);
if (backend == NULL) {
@ -335,8 +382,12 @@ struct wlr_backend *wlr_backend_autocreate(struct wl_display *display,
if (!wl_backend) {
goto error;
}
wlr_multi_backend_add(multi, wl_backend);
if (!auto_backend_monitor_create(multi, wl_backend)) {
goto error;
}
goto success;
}
@ -347,8 +398,12 @@ struct wlr_backend *wlr_backend_autocreate(struct wl_display *display,
if (!x11_backend) {
goto error;
}
wlr_multi_backend_add(multi, x11_backend);
if (!auto_backend_monitor_create(multi, x11_backend)) {
goto error;
}
goto success;
}
@ -362,6 +417,9 @@ struct wlr_backend *wlr_backend_autocreate(struct wl_display *display,
struct wlr_backend *libinput = attempt_libinput_backend(display, session);
if (libinput) {
wlr_multi_backend_add(multi, libinput);
if (!auto_backend_monitor_create(multi, libinput)) {
goto error;
}
} else if (env_parse_bool("WLR_LIBINPUT_NO_DEVICES")) {
wlr_log(WLR_INFO, "WLR_LIBINPUT_NO_DEVICES is set, "
"starting without libinput backend");
@ -377,6 +435,10 @@ struct wlr_backend *wlr_backend_autocreate(struct wl_display *display,
goto error;
}
if (!auto_backend_monitor_create(multi, primary_drm)) {
goto error;
}
success:
if (session_ptr != NULL) {
*session_ptr = session;

3
include/wlr/backend.h
View File

@ -37,6 +37,9 @@ struct wlr_backend {
*
* If session_ptr is not NULL, it's populated with the session which has been
* created with the backend, if any.
*
* The multi-backend will be destroyed if one of the primary underlying
* backends is destroyed (e.g. if the primary DRM device is unplugged).
*/
struct wlr_backend *wlr_backend_autocreate(struct wl_display *display,
struct wlr_session **session_ptr);