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backend/wayland: use a separate event queue for busy loops

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This avoids processing events which we're not interested in.
Specifically, this fixes a case where output_commit() could be
indirectly called from itself either from import_dmabuf() or while
waiting for a configure event when enabling the output.
This commit is contained in:
Kirill Primak 2025-01-24 19:36:47 +03:00 • committed by Isaac Freund
parent 35ff09a754
commit b13fe9b3a1
3 changed files with 38 additions and 7 deletions
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33
backend/wayland/output.c
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@ -243,15 +243,24 @@ static struct wl_buffer *import_dmabuf(struct wlr_wl_backend *wl,
zwp_linux_buffer_params_v1_add_listener(params, &dmabuf_listener, &data);
zwp_linux_buffer_params_v1_create(params, dmabuf->width, dmabuf->height, dmabuf->format, 0);
struct wl_event_queue *display_queue =
wl_proxy_get_queue((struct wl_proxy *)wl->remote_display);
wl_proxy_set_queue((struct wl_proxy *)params, wl->busy_loop_queue);
while (!data.done) {
if (wl_display_dispatch(wl->remote_display) < 0) {
wlr_log(WLR_ERROR, "wl_display_dispatch() failed");
if (wl_display_dispatch_queue(wl->remote_display, wl->busy_loop_queue) < 0) {
wlr_log(WLR_ERROR, "wl_display_dispatch_queue() failed");
break;
}
}
struct wl_buffer *buffer = data.wl_buffer;
if (buffer != NULL) {
wl_proxy_set_queue((struct wl_proxy *)buffer, display_queue);
}
zwp_linux_buffer_params_v1_destroy(params);
return data.wl_buffer;
return buffer;
}
static struct wl_buffer *import_shm(struct wlr_wl_backend *wl,
@ -747,13 +756,25 @@ static bool output_commit(struct wlr_output *wlr_output, const struct wlr_output
wl_surface_commit(output->surface);
output->initialized = true;
struct wl_event_queue *display_queue =
wl_proxy_get_queue((struct wl_proxy *)wl->remote_display);
wl_proxy_set_queue((struct wl_proxy *)output->xdg_surface, wl->busy_loop_queue);
wl_proxy_set_queue((struct wl_proxy *)output->xdg_toplevel, wl->busy_loop_queue);
wl_display_flush(wl->remote_display);
while (!output->configured) {
if (wl_display_dispatch(wl->remote_display) == -1) {
wlr_log(WLR_ERROR, "wl_display_dispatch() failed");
return false;
if (wl_display_dispatch_queue(wl->remote_display, wl->busy_loop_queue) == -1) {
wlr_log(WLR_ERROR, "wl_display_dispatch_queue() failed");
break;
}
}
wl_proxy_set_queue((struct wl_proxy *)output->xdg_surface, display_queue);
wl_proxy_set_queue((struct wl_proxy *)output->xdg_toplevel, display_queue);
if (!output->configured) {
return false;
}
}
struct wlr_wl_buffer *buffer = NULL;