Proper fix for screen freeze
If an X event is received at a very specific point in time, it can trigger a race condition in Xlib. Said event will be read, but Xlib will nonetheless be completely unaware of the event. This cause compton to sometimes block on select() while there are events ready to be processed. If the event is a damage report, screen freeze will happen until some other event is received. The proper fix is to switch to xcb for event handling, thus avoid this problem entirely.
This commit is contained in:
Yuxuan Shui
parent
43f3744fea
commit
7af815a0aa
2
Makefile
2
Makefile
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@ -9,7 +9,7 @@ MANDIR ?= $(PREFIX)/share/man/man1
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APPDIR ?= $(PREFIX)/share/applications
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ICODIR ?= $(PREFIX)/share/icons/hicolor/
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PACKAGES = x11 xcomposite xfixes xdamage xrender xext xrandr
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PACKAGES = x11 x11-xcb xcomposite xfixes xdamage xrender xext xrandr
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LIBS = -lm -lrt
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INCS =
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@ -78,6 +78,7 @@
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#include <ctype.h>
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#include <sys/time.h>
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#include <X11/Xlib-xcb.h>
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#include <X11/Xlib.h>
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#include <X11/Xutil.h>
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#include <X11/Xatom.h>
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@ -1071,7 +1072,7 @@ struct win {
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/// when the window is unmapped.
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bool need_configure;
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/// Queued <code>ConfigureNotify</code> when the window is unmapped.
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XConfigureEvent queue_configure;
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xcb_configure_notify_event_t queue_configure;
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/// Region to be ignored when painting. Basically the region where
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/// higher opaque windows will paint upon. Depends on window frame
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/// opacity state, window geometry, window mapped/unmapped state,
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185
src/compton.c
185
src/compton.c
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@ -10,20 +10,23 @@
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#include <ctype.h>
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#include <string.h>
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#include <xcb/shape.h>
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#include <xcb/randr.h>
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#include <xcb/damage.h>
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#include "compton.h"
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#include "win.h"
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#include "x.h"
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#include "config.h"
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static void
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configure_win(session_t *ps, xcb_configure_notify_event_t *ce);
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static bool
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xr_blur_dst(session_t *ps, Picture tgt_buffer,
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int x, int y, int wid, int hei, XFixed **blur_kerns,
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XserverRegion reg_clip);
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inline static void
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ev_handle(session_t *ps, XEvent *ev);
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static bool
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fork_after(session_t *ps);
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@ -167,12 +170,6 @@ get_opacity_percent(win *w);
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static void
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restack_win(session_t *ps, win *w, Window new_above);
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static void
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configure_win(session_t *ps, XConfigureEvent *ce);
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static void
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circulate_win(session_t *ps, XCirculateEvent *ce);
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static void
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finish_destroy_win(session_t *ps, win *w);
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@ -194,36 +191,6 @@ usage(int ret);
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static bool
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register_cm(session_t *ps);
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inline static void
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ev_focus_in(session_t *ps, XFocusChangeEvent *ev);
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inline static void
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ev_focus_out(session_t *ps, XFocusChangeEvent *ev);
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inline static void
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ev_create_notify(session_t *ps, XCreateWindowEvent *ev);
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inline static void
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ev_configure_notify(session_t *ps, XConfigureEvent *ev);
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inline static void
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ev_destroy_notify(session_t *ps, XDestroyWindowEvent *ev);
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inline static void
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ev_map_notify(session_t *ps, XMapEvent *ev);
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inline static void
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ev_unmap_notify(session_t *ps, XUnmapEvent *ev);
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inline static void
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ev_reparent_notify(session_t *ps, XReparentEvent *ev);
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inline static void
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ev_circulate_notify(session_t *ps, XCirculateEvent *ev);
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inline static void
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ev_expose(session_t *ps, XExposeEvent *ev);
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static void
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update_ewmh_active_win(session_t *ps);
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@ -2377,7 +2344,7 @@ static bool
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init_filters(session_t *ps);
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static void
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configure_win(session_t *ps, XConfigureEvent *ce) {
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configure_win(session_t *ps, xcb_configure_notify_event_t *ce) {
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// On root window changes
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if (ce->window == ps->root) {
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free_paint(ps, &ps->tgt_buffer);
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@ -2425,10 +2392,10 @@ configure_win(session_t *ps, XConfigureEvent *ce) {
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/* save the configure event for when the window maps */
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w->need_configure = true;
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w->queue_configure = *ce;
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restack_win(ps, w, ce->above);
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restack_win(ps, w, ce->above_sibling);
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} else {
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if (!(w->need_configure)) {
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restack_win(ps, w, ce->above);
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restack_win(ps, w, ce->above_sibling);
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}
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bool factor_change = false;
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@ -2492,7 +2459,7 @@ configure_win(session_t *ps, XConfigureEvent *ce) {
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}
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static void
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circulate_win(session_t *ps, XCirculateEvent *ce) {
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circulate_win(session_t *ps, xcb_circulate_notify_event_t *ce) {
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win *w = find_win(ps, ce->window);
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Window new_above;
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@ -2818,9 +2785,9 @@ ev_serial(XEvent *ev) {
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}
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static inline const char *
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ev_name(session_t *ps, XEvent *ev) {
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ev_name(session_t *ps, xcb_generic_event_t *ev) {
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static char buf[128];
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switch (ev->type & 0x7f) {
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switch (ev->response_type & 0x7f) {
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CASESTRRET(FocusIn);
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CASESTRRET(FocusOut);
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CASESTRRET(CreateNotify);
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@ -2835,15 +2802,15 @@ ev_name(session_t *ps, XEvent *ev) {
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CASESTRRET(ClientMessage);
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}
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if (isdamagenotify(ps, ev))
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if (ps->damage_event + XDamageNotify == ev->response_type)
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return "Damage";
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if (ps->shape_exists && ev->type == ps->shape_event)
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if (ps->shape_exists && ev->response_type == ps->shape_event)
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return "ShapeNotify";
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#ifdef CONFIG_XSYNC
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if (ps->xsync_exists) {
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int o = ev->type - ps->xsync_event;
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int o = ev->response_type - ps->xsync_event;
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switch (o) {
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CASESTRRET(XSyncCounterNotify);
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CASESTRRET(XSyncAlarmNotify);
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@ -2851,44 +2818,44 @@ ev_name(session_t *ps, XEvent *ev) {
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}
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#endif
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sprintf(buf, "Event %d", ev->type);
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sprintf(buf, "Event %d", ev->response_type);
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return buf;
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}
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static inline Window
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ev_window(session_t *ps, XEvent *ev) {
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switch (ev->type) {
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ev_window(session_t *ps, xcb_generic_event_t *ev) {
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switch (ev->response_type) {
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case FocusIn:
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case FocusOut:
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return ev->xfocus.window;
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return ((xcb_focus_in_event_t *)ev)->event;
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case CreateNotify:
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return ev->xcreatewindow.window;
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return ((xcb_create_notify_event_t *)ev)->window;
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case ConfigureNotify:
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return ev->xconfigure.window;
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return ((xcb_configure_notify_event_t *)ev)->window;
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case DestroyNotify:
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return ev->xdestroywindow.window;
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return ((xcb_destroy_notify_event_t *)ev)->window;
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case MapNotify:
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return ev->xmap.window;
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return ((xcb_map_notify_event_t *)ev)->window;
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case UnmapNotify:
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return ev->xunmap.window;
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return ((xcb_unmap_notify_event_t *)ev)->window;
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case ReparentNotify:
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return ev->xreparent.window;
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return ((xcb_reparent_notify_event_t *)ev)->window;
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case CirculateNotify:
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return ev->xcirculate.window;
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return ((xcb_circulate_notify_event_t *)ev)->window;
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case Expose:
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return ev->xexpose.window;
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return ((xcb_expose_event_t *)ev)->window;
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case PropertyNotify:
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return ev->xproperty.window;
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return ((xcb_property_notify_event_t *)ev)->window;
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case ClientMessage:
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return ev->xclient.window;
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return ((xcb_client_message_event_t *)ev)->window;
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default:
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if (isdamagenotify(ps, ev)) {
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return ((XDamageNotifyEvent *)ev)->drawable;
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if (ps->damage_event + XDamageNotify == ev->response_type) {
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return ((xcb_damage_notify_event_t *)ev)->drawable;
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}
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if (ps->shape_exists && ev->type == ps->shape_event) {
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return ((XShapeEvent *) ev)->window;
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if (ps->shape_exists && ev->response_type == ps->shape_event) {
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return ((xcb_shape_notify_event_t *) ev)->affected_window;
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}
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return 0;
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@ -2943,7 +2910,7 @@ ev_focus_accept(XFocusChangeEvent *ev) {
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*/
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static inline void
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ev_focus_in(session_t *ps, XFocusChangeEvent *ev) {
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ev_focus_in(session_t *ps, xcb_focus_in_event_t *ev) {
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#ifdef DEBUG_EVENTS
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ev_focus_report(ev);
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#endif
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@ -2952,7 +2919,7 @@ ev_focus_in(session_t *ps, XFocusChangeEvent *ev) {
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}
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inline static void
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ev_focus_out(session_t *ps, XFocusChangeEvent *ev) {
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ev_focus_out(session_t *ps, xcb_focus_out_event_t *ev) {
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#ifdef DEBUG_EVENTS
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ev_focus_report(ev);
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#endif
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@ -2961,13 +2928,13 @@ ev_focus_out(session_t *ps, XFocusChangeEvent *ev) {
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}
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inline static void
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ev_create_notify(session_t *ps, XCreateWindowEvent *ev) {
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ev_create_notify(session_t *ps, xcb_create_notify_event_t *ev) {
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assert(ev->parent == ps->root);
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add_win(ps, ev->window, 0);
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}
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inline static void
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ev_configure_notify(session_t *ps, XConfigureEvent *ev) {
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ev_configure_notify(session_t *ps, xcb_configure_notify_event_t *ev) {
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#ifdef DEBUG_EVENTS
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printf(" { send_event: %d, "
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" above: %#010lx, "
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@ -2978,17 +2945,17 @@ ev_configure_notify(session_t *ps, XConfigureEvent *ev) {
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}
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inline static void
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ev_destroy_notify(session_t *ps, XDestroyWindowEvent *ev) {
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ev_destroy_notify(session_t *ps, xcb_destroy_notify_event_t *ev) {
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destroy_win(ps, ev->window);
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}
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inline static void
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ev_map_notify(session_t *ps, XMapEvent *ev) {
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ev_map_notify(session_t *ps, xcb_map_notify_event_t *ev) {
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map_win(ps, ev->window);
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}
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inline static void
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ev_unmap_notify(session_t *ps, XUnmapEvent *ev) {
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ev_unmap_notify(session_t *ps, xcb_unmap_notify_event_t *ev) {
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win *w = find_win(ps, ev->window);
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if (w)
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@ -2996,7 +2963,7 @@ ev_unmap_notify(session_t *ps, XUnmapEvent *ev) {
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}
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inline static void
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ev_reparent_notify(session_t *ps, XReparentEvent *ev) {
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ev_reparent_notify(session_t *ps, xcb_reparent_notify_event_t *ev) {
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#ifdef DEBUG_EVENTS
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printf_dbg(" { new_parent: %#010lx, override_redirect: %d }\n",
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ev->parent, ev->override_redirect);
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@ -3038,12 +3005,12 @@ ev_reparent_notify(session_t *ps, XReparentEvent *ev) {
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}
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inline static void
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ev_circulate_notify(session_t *ps, XCirculateEvent *ev) {
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ev_circulate_notify(session_t *ps, xcb_circulate_notify_event_t *ev) {
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circulate_win(ps, ev);
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}
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inline static void
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ev_expose(session_t *ps, XExposeEvent *ev) {
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ev_expose(session_t *ps, xcb_expose_event_t *ev) {
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if (ev->window == ps->root || (ps->overlay && ev->window == ps->overlay)) {
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int more = ev->count + 1;
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if (ps->n_expose == ps->size_expose) {
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@ -3087,7 +3054,7 @@ update_ewmh_active_win(session_t *ps) {
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}
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inline static void
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ev_property_notify(session_t *ps, XPropertyEvent *ev) {
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ev_property_notify(session_t *ps, xcb_property_notify_event_t *ev) {
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#ifdef DEBUG_EVENTS
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{
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// Print out changed atom
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@ -3218,7 +3185,7 @@ ev_property_notify(session_t *ps, XPropertyEvent *ev) {
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}
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inline static void
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ev_damage_notify(session_t *ps, XDamageNotifyEvent *de) {
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ev_damage_notify(session_t *ps, xcb_damage_notify_event_t *de) {
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/*
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if (ps->root == de->drawable) {
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root_damaged();
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@ -3233,8 +3200,8 @@ ev_damage_notify(session_t *ps, XDamageNotifyEvent *de) {
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}
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inline static void
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ev_shape_notify(session_t *ps, XShapeEvent *ev) {
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win *w = find_win(ps, ev->window);
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ev_shape_notify(session_t *ps, xcb_shape_notify_event_t *ev) {
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win *w = find_win(ps, ev->affected_window);
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if (!w || IsUnmapped == w->a.map_state) return;
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/*
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@ -3264,7 +3231,7 @@ ev_shape_notify(session_t *ps, XShapeEvent *ev) {
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*/
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static void
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ev_screen_change_notify(session_t *ps,
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XRRScreenChangeNotifyEvent __attribute__((unused)) *ev) {
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xcb_randr_screen_change_notify_event_t __attribute__((unused)) *ev) {
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if (ps->o.xinerama_shadow_crop)
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cxinerama_upd_scrs(ps);
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@ -3280,7 +3247,7 @@ ev_screen_change_notify(session_t *ps,
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inline static void
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ev_selection_clear(session_t *ps,
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XSelectionClearEvent __attribute__((unused)) *ev) {
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xcb_selection_clear_event_t __attribute__((unused)) *ev) {
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// The only selection we own is the _NET_WM_CM_Sn selection.
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// If we lose that one, we should exit.
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fprintf(stderr, "Another composite manager started and "
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@ -3316,9 +3283,9 @@ ev_window_name(session_t *ps, Window wid, char **name) {
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}
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static void
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ev_handle(session_t *ps, XEvent *ev) {
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if ((ev->type & 0x7f) != KeymapNotify) {
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discard_ignore(ps, ev->xany.serial);
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ev_handle(session_t *ps, xcb_generic_event_t *ev) {
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if ((ev->response_type & 0x7f) != KeymapNotify) {
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discard_ignore(ps, ev->full_sequence);
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}
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#ifdef DEBUG_EVENTS
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@ -3333,54 +3300,54 @@ ev_handle(session_t *ps, XEvent *ev) {
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}
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#endif
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switch (ev->type) {
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switch (ev->response_type) {
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case FocusIn:
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ev_focus_in(ps, (XFocusChangeEvent *)ev);
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ev_focus_in(ps, (xcb_focus_in_event_t *)ev);
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break;
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case FocusOut:
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ev_focus_out(ps, (XFocusChangeEvent *)ev);
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ev_focus_out(ps, (xcb_focus_out_event_t *)ev);
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break;
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case CreateNotify:
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ev_create_notify(ps, (XCreateWindowEvent *)ev);
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ev_create_notify(ps, (xcb_create_notify_event_t *)ev);
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break;
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case ConfigureNotify:
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ev_configure_notify(ps, (XConfigureEvent *)ev);
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ev_configure_notify(ps, (xcb_configure_notify_event_t *)ev);
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break;
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case DestroyNotify:
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ev_destroy_notify(ps, (XDestroyWindowEvent *)ev);
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ev_destroy_notify(ps, (xcb_destroy_notify_event_t *)ev);
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break;
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case MapNotify:
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ev_map_notify(ps, (XMapEvent *)ev);
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ev_map_notify(ps, (xcb_map_notify_event_t *)ev);
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break;
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case UnmapNotify:
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ev_unmap_notify(ps, (XUnmapEvent *)ev);
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ev_unmap_notify(ps, (xcb_unmap_notify_event_t *)ev);
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break;
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case ReparentNotify:
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ev_reparent_notify(ps, (XReparentEvent *)ev);
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ev_reparent_notify(ps, (xcb_reparent_notify_event_t *)ev);
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break;
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case CirculateNotify:
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ev_circulate_notify(ps, (XCirculateEvent *)ev);
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ev_circulate_notify(ps, (xcb_circulate_notify_event_t *)ev);
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break;
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case Expose:
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ev_expose(ps, (XExposeEvent *)ev);
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ev_expose(ps, (xcb_expose_event_t *)ev);
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break;
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case PropertyNotify:
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ev_property_notify(ps, (XPropertyEvent *)ev);
|
||||
ev_property_notify(ps, (xcb_property_notify_event_t *)ev);
|
||||
break;
|
||||
case SelectionClear:
|
||||
ev_selection_clear(ps, (XSelectionClearEvent *)ev);
|
||||
ev_selection_clear(ps, (xcb_selection_clear_event_t *)ev);
|
||||
break;
|
||||
default:
|
||||
if (ps->shape_exists && ev->type == ps->shape_event) {
|
||||
ev_shape_notify(ps, (XShapeEvent *) ev);
|
||||
if (ps->shape_exists && ev->response_type == ps->shape_event) {
|
||||
ev_shape_notify(ps, (xcb_shape_notify_event_t *) ev);
|
||||
break;
|
||||
}
|
||||
if (ps->randr_exists && ev->type == (ps->randr_event + RRScreenChangeNotify)) {
|
||||
ev_screen_change_notify(ps, (XRRScreenChangeNotifyEvent *) ev);
|
||||
if (ps->randr_exists && ev->response_type == (ps->randr_event + RRScreenChangeNotify)) {
|
||||
ev_screen_change_notify(ps, (xcb_randr_screen_change_notify_event_t *) ev);
|
||||
break;
|
||||
}
|
||||
if (isdamagenotify(ps, ev)) {
|
||||
ev_damage_notify(ps, (XDamageNotifyEvent *) ev);
|
||||
if (ps->damage_event + XDamageNotify == ev->response_type) {
|
||||
ev_damage_notify(ps, (xcb_damage_notify_event_t *) ev);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
|
@ -5092,12 +5059,12 @@ mainloop(session_t *ps) {
|
|||
// Sometimes poll() returns 1 but no events are actually read,
|
||||
// causing XNextEvent() to block, I have no idea what's wrong, so we
|
||||
// check for the number of events here.
|
||||
if (XEventsQueued(ps->dpy, QueuedAfterReading)) {
|
||||
XEvent ev = { };
|
||||
|
||||
XNextEvent(ps->dpy, &ev);
|
||||
ev_handle(ps, &ev);
|
||||
xcb_connection_t *c = XGetXCBConnection(ps->dpy);
|
||||
xcb_generic_event_t *ev = xcb_poll_for_event(c);
|
||||
if (ev) {
|
||||
ev_handle(ps, ev);
|
||||
ps->ev_received = true;
|
||||
free(ev);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -332,14 +332,6 @@ ms_to_tv(int timeout) {
|
|||
};
|
||||
}
|
||||
|
||||
/**
|
||||
* Whether an event is DamageNotify.
|
||||
*/
|
||||
static inline bool
|
||||
isdamagenotify(session_t *ps, const XEvent *ev) {
|
||||
return ps->damage_event + XDamageNotify == ev->type;
|
||||
}
|
||||
|
||||
/**
|
||||
* Create a XTextProperty of a single string.
|
||||
*/
|
||||
|
|
|
|||
Loading…
Reference in New Issue