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swayfx/sway/server.c
Kenny Levinsen c8bf84c82d transactions: Amend pending transactions 
The transaction system contains a necessary optimization where a popped
transaction is combined with later, similar transactions. This breaks
the chronological order of states, and can lead to desynchronized
geometries.

To fix this, we replace the queue with only 2 transactions: current and
pending. If a pending transaction exists, it is updated with new state
instead of creating additional transactions.

As we never have more than a single waiting transaction, we no longer
need the queue optimization that is causing problems.

Closes: https://github.com/swaywm/sway/issues/6012
2021-02-16 00:18:26 +01:00

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#define _POSIX_C_SOURCE 200809L
#include <assert.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <wayland-server-core.h>
#include <wlr/backend.h>
#include <wlr/backend/headless.h>
#include <wlr/backend/multi.h>
#include <wlr/backend/noop.h>
#include <wlr/backend/session.h>
#include <wlr/config.h>
#include <wlr/render/wlr_renderer.h>
#include <wlr/types/wlr_compositor.h>
#include <wlr/types/wlr_data_control_v1.h>
#include <wlr/types/wlr_export_dmabuf_v1.h>
#include <wlr/types/wlr_gamma_control_v1.h>
#include <wlr/types/wlr_idle.h>
#include <wlr/types/wlr_layer_shell_v1.h>
#include <wlr/types/wlr_pointer_constraints_v1.h>
#include <wlr/types/wlr_primary_selection_v1.h>
#include <wlr/types/wlr_relative_pointer_v1.h>
#include <wlr/types/wlr_screencopy_v1.h>
#include <wlr/types/wlr_server_decoration.h>
#include <wlr/types/wlr_tablet_v2.h>
#include <wlr/types/wlr_viewporter.h>
#include <wlr/types/wlr_xcursor_manager.h>
#include <wlr/types/wlr_xdg_decoration_v1.h>
#if WLR_HAS_XDG_FOREIGN
#include <wlr/types/wlr_xdg_foreign_registry.h>
#include <wlr/types/wlr_xdg_foreign_v1.h>
#include <wlr/types/wlr_xdg_foreign_v2.h>
#endif
#include <wlr/types/wlr_xdg_output_v1.h>
#include "config.h"
#include "list.h"
#include "log.h"
#include "sway/config.h"
#include "sway/desktop/idle_inhibit_v1.h"
#include "sway/input/input-manager.h"
#include "sway/output.h"
#include "sway/server.h"
#include "sway/tree/root.h"
#if HAVE_XWAYLAND
#include "sway/xwayland.h"
#endif
bool server_privileged_prepare(struct sway_server *server) {
sway_log(SWAY_DEBUG, "Preparing Wayland server initialization");
server->wl_display = wl_display_create();
server->wl_event_loop = wl_display_get_event_loop(server->wl_display);
server->backend = wlr_backend_autocreate(server->wl_display);
if (!server->backend) {
sway_log(SWAY_ERROR, "Unable to create backend");
return false;
}
return true;
}
bool server_init(struct sway_server *server) {
sway_log(SWAY_DEBUG, "Initializing Wayland server");
struct wlr_renderer *renderer = wlr_backend_get_renderer(server->backend);
assert(renderer);
wlr_renderer_init_wl_display(renderer, server->wl_display);
server->compositor = wlr_compositor_create(server->wl_display, renderer);
server->compositor_new_surface.notify = handle_compositor_new_surface;
wl_signal_add(&server->compositor->events.new_surface,
&server->compositor_new_surface);
server->data_device_manager =
wlr_data_device_manager_create(server->wl_display);
wlr_gamma_control_manager_v1_create(server->wl_display);
server->new_output.notify = handle_new_output;
wl_signal_add(&server->backend->events.new_output, &server->new_output);
server->output_layout_change.notify = handle_output_layout_change;
wl_signal_add(&root->output_layout->events.change,
&server->output_layout_change);
wlr_xdg_output_manager_v1_create(server->wl_display, root->output_layout);
server->idle = wlr_idle_create(server->wl_display);
server->idle_inhibit_manager_v1 =
sway_idle_inhibit_manager_v1_create(server->wl_display, server->idle);
server->layer_shell = wlr_layer_shell_v1_create(server->wl_display);
wl_signal_add(&server->layer_shell->events.new_surface,
&server->layer_shell_surface);
server->layer_shell_surface.notify = handle_layer_shell_surface;
server->xdg_shell = wlr_xdg_shell_create(server->wl_display);
wl_signal_add(&server->xdg_shell->events.new_surface,
&server->xdg_shell_surface);
server->xdg_shell_surface.notify = handle_xdg_shell_surface;
server->tablet_v2 = wlr_tablet_v2_create(server->wl_display);
server->server_decoration_manager =
wlr_server_decoration_manager_create(server->wl_display);
wlr_server_decoration_manager_set_default_mode(
server->server_decoration_manager,
WLR_SERVER_DECORATION_MANAGER_MODE_SERVER);
wl_signal_add(&server->server_decoration_manager->events.new_decoration,
&server->server_decoration);
server->server_decoration.notify = handle_server_decoration;
wl_list_init(&server->decorations);
server->xdg_decoration_manager =
wlr_xdg_decoration_manager_v1_create(server->wl_display);
wl_signal_add(
&server->xdg_decoration_manager->events.new_toplevel_decoration,
&server->xdg_decoration);
server->xdg_decoration.notify = handle_xdg_decoration;
wl_list_init(&server->xdg_decorations);
server->relative_pointer_manager =
wlr_relative_pointer_manager_v1_create(server->wl_display);
server->pointer_constraints =
wlr_pointer_constraints_v1_create(server->wl_display);
server->pointer_constraint.notify = handle_pointer_constraint;
wl_signal_add(&server->pointer_constraints->events.new_constraint,
&server->pointer_constraint);
server->presentation =
wlr_presentation_create(server->wl_display, server->backend);
server->output_manager_v1 =
wlr_output_manager_v1_create(server->wl_display);
server->output_manager_apply.notify = handle_output_manager_apply;
wl_signal_add(&server->output_manager_v1->events.apply,
&server->output_manager_apply);
server->output_manager_test.notify = handle_output_manager_test;
wl_signal_add(&server->output_manager_v1->events.test,
&server->output_manager_test);
server->output_power_manager_v1 =
wlr_output_power_manager_v1_create(server->wl_display);
server->output_power_manager_set_mode.notify =
handle_output_power_manager_set_mode;
wl_signal_add(&server->output_power_manager_v1->events.set_mode,
&server->output_power_manager_set_mode);
server->input_method = wlr_input_method_manager_v2_create(server->wl_display);
server->text_input = wlr_text_input_manager_v3_create(server->wl_display);
server->foreign_toplevel_manager =
wlr_foreign_toplevel_manager_v1_create(server->wl_display);
wlr_export_dmabuf_manager_v1_create(server->wl_display);
wlr_screencopy_manager_v1_create(server->wl_display);
wlr_data_control_manager_v1_create(server->wl_display);
wlr_primary_selection_v1_device_manager_create(server->wl_display);
wlr_viewporter_create(server->wl_display);
#if WLR_HAS_XDG_FOREIGN
struct wlr_xdg_foreign_registry *foreign_registry =
wlr_xdg_foreign_registry_create(server->wl_display);
wlr_xdg_foreign_v1_create(server->wl_display, foreign_registry);
wlr_xdg_foreign_v2_create(server->wl_display, foreign_registry);
#endif
// Avoid using "wayland-0" as display socket
char name_candidate[16];
for (int i = 1; i <= 32; ++i) {
sprintf(name_candidate, "wayland-%d", i);
if (wl_display_add_socket(server->wl_display, name_candidate) >= 0) {
server->socket = strdup(name_candidate);
break;
}
}
if (!server->socket) {
sway_log(SWAY_ERROR, "Unable to open wayland socket");
wlr_backend_destroy(server->backend);
return false;
}
server->noop_backend = wlr_noop_backend_create(server->wl_display);
struct wlr_output *wlr_output = wlr_noop_add_output(server->noop_backend);
root->noop_output = output_create(wlr_output);
server->headless_backend =
wlr_headless_backend_create_with_renderer(server->wl_display, renderer);
if (!server->headless_backend) {
sway_log(SWAY_INFO, "Failed to create secondary headless backend, "
"starting without it");
} else {
wlr_multi_backend_add(server->backend, server->headless_backend);
}
// This may have been set already via -Dtxn-timeout
if (!server->txn_timeout_ms) {
server->txn_timeout_ms = 200;
}
server->dirty_nodes = create_list();
server->input = input_manager_create(server);
input_manager_get_default_seat(); // create seat0
return true;
}
void server_fini(struct sway_server *server) {
// TODO: free sway-specific resources
#if HAVE_XWAYLAND
wlr_xwayland_destroy(server->xwayland.wlr_xwayland);
#endif
wl_display_destroy_clients(server->wl_display);
wl_display_destroy(server->wl_display);
list_free(server->dirty_nodes);
}
bool server_start(struct sway_server *server) {
#if HAVE_XWAYLAND
if (config->xwayland != XWAYLAND_MODE_DISABLED) {
sway_log(SWAY_DEBUG, "Initializing Xwayland (lazy=%d)",
config->xwayland == XWAYLAND_MODE_LAZY);
server->xwayland.wlr_xwayland =
wlr_xwayland_create(server->wl_display, server->compositor,
config->xwayland == XWAYLAND_MODE_LAZY);
if (!server->xwayland.wlr_xwayland) {
sway_log(SWAY_ERROR, "Failed to start Xwayland");
unsetenv("DISPLAY");
} else {
wl_signal_add(&server->xwayland.wlr_xwayland->events.new_surface,
&server->xwayland_surface);
server->xwayland_surface.notify = handle_xwayland_surface;
wl_signal_add(&server->xwayland.wlr_xwayland->events.ready,
&server->xwayland_ready);
server->xwayland_ready.notify = handle_xwayland_ready;
setenv("DISPLAY", server->xwayland.wlr_xwayland->display_name, true);
/* xcursor configured by the default seat */
}
}
#endif
sway_log(SWAY_INFO, "Starting backend on wayland display '%s'",
server->socket);
if (!wlr_backend_start(server->backend)) {
sway_log(SWAY_ERROR, "Failed to start backend");
wlr_backend_destroy(server->backend);
return false;
}
return true;
}
void server_run(struct sway_server *server) {
sway_log(SWAY_INFO, "Running compositor on wayland display '%s'",
server->socket);
wl_display_run(server->wl_display);
}
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