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Bugfix: Eliminate race condition, fix dock windows

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There was a race condition when mapping a window and not setting the event mask
before. Therefore, the ReparentNotify and (more important) the UnmapNotify generated
by reparenting were not received, thus leaving the awaiting_useless_unmap variable
of the client "true". To just make it work, in previous commits the DestroyNotify
handler was introduced. Fortunately, with fixing this race condition by first
setting the event mask and mapping the window afterwards, we can remove this handler.

As for the dock windows, there were quite some occurences were client->container
was used without checking if the client is inside a container at all.

Furthermore, the client’s strut containing the space to reserve at the screen edge
is now checked and the desired height is set to the window’s height if the strut
contains 0 or if no strut was specified at all.
This commit is contained in:
Michael Stapelberg
2009-03-10 20:56:25 +01:00
parent 434345aa30
commit 408b2bdb39
6 changed files with 74 additions and 64 deletions
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90
src/mainx.c
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@ -126,14 +126,23 @@ void reparent_window(xcb_connection_t *conn, xcb_window_t child,
int16_t x, int16_t y, uint16_t width, uint16_t height) {
xcb_get_property_cookie_t wm_type_cookie, strut_cookie;
uint32_t mask = 0;
uint32_t values[3];
/* We are interested in property changes */
mask = XCB_CW_EVENT_MASK;
values[0] = XCB_EVENT_MASK_PROPERTY_CHANGE |
XCB_EVENT_MASK_STRUCTURE_NOTIFY |
XCB_EVENT_MASK_ENTER_WINDOW;
xcb_change_window_attributes(conn, child, mask, values);
/* Map the window first to avoid flickering */
xcb_map_window(conn, child);
/* Place requests for properties ASAP */
wm_type_cookie = xcb_get_any_property_unchecked(conn, false, child, atoms[_NET_WM_WINDOW_TYPE], UINT32_MAX);
strut_cookie = xcb_get_any_property_unchecked(conn, false, child, atoms[_NET_WM_STRUT_PARTIAL], UINT32_MAX);
/* Map the window first to avoid flickering */
xcb_map_window(conn, child);
Client *new = table_get(byChild, child);
/* Events for already managed windows should already be filtered in manage_window() */
@ -142,19 +151,20 @@ void reparent_window(xcb_connection_t *conn, xcb_window_t child,
LOG("reparenting new client\n");
new = calloc(sizeof(Client), 1);
new->force_reconfigure = true;
uint32_t mask = 0;
uint32_t values[3];
/* Update the data structures */
Client *old_focused = CUR_CELL->currently_focused;
new->container = CUR_CELL;
new->workspace = new->container->workspace;
new->frame = xcb_generate_id(conn);
new->child = child;
new->rect.width = width;
new->rect.height = height;
mask = 0;
/* Don’t generate events for our new window, it should *not* be managed */
mask |= XCB_CW_OVERRIDE_REDIRECT;
values[0] = 1;
@ -199,19 +209,6 @@ void reparent_window(xcb_connection_t *conn, xcb_window_t child,
return;
}
/* We are interested in property changes */
mask = XCB_CW_EVENT_MASK;
values[0] = XCB_EVENT_MASK_PROPERTY_CHANGE |
XCB_EVENT_MASK_STRUCTURE_NOTIFY |
XCB_EVENT_MASK_ENTER_WINDOW;
cookie = xcb_change_window_attributes_checked(conn, child, mask, values);
if (xcb_request_check(conn, cookie) != NULL) {
LOG("Could not change window attributes, aborting\n");
xcb_destroy_window(conn, new->frame);
free(new);
return;
}
/* Put our data structure (Client) into the table */
table_put(byParent, new->frame, new);
table_put(byChild, child, new);
@ -222,16 +219,6 @@ void reparent_window(xcb_connection_t *conn, xcb_window_t child,
1 /* left mouse button */,
XCB_BUTTON_MASK_ANY /* don’t filter for any modifiers */);
/* Focus the new window if we’re not in fullscreen mode */
if (CUR_CELL->workspace->fullscreen_client == NULL) {
CUR_CELL->currently_focused = new;
xcb_set_input_focus(conn, XCB_INPUT_FOCUS_POINTER_ROOT, new->child, XCB_CURRENT_TIME);
} else {
/* If we are in fullscreen, we should lower the window to not be annoying */
uint32_t values[] = { XCB_STACK_MODE_BELOW };
xcb_configure_window(conn, new->frame, XCB_CONFIG_WINDOW_STACK_MODE, values);
}
/* Get _NET_WM_WINDOW_TYPE (to see if it’s a dock) */
xcb_atom_t *atom;
xcb_get_property_reply_t *preply = xcb_get_property_reply(conn, wm_type_cookie, NULL);
@ -247,23 +234,44 @@ void reparent_window(xcb_connection_t *conn, xcb_window_t child,
}
}
/* Get _NET_WM_STRUT_PARTIAL to determine the client’s requested height */
uint32_t *strut;
preply = xcb_get_property_reply(conn, strut_cookie, NULL);
if (preply != NULL && preply->value_len > 0 && (strut = xcb_get_property_value(preply))) {
/* We only use a subset of the provided values, namely the reserved space at the top/bottom
of the screen. This is because the only possibility for bars is at to be at the top/bottom
with maximum horizontal size.
TODO: bars at the top */
new->desired_height = strut[3];
LOG("the client wants to be %d pixels height\n", new->desired_height);
if (new->dock) {
/* Get _NET_WM_STRUT_PARTIAL to determine the client’s requested height */
uint32_t *strut;
preply = xcb_get_property_reply(conn, strut_cookie, NULL);
if (preply != NULL && preply->value_len > 0 && (strut = xcb_get_property_value(preply))) {
/* We only use a subset of the provided values, namely the reserved space at the top/bottom
of the screen. This is because the only possibility for bars is at to be at the top/bottom
with maximum horizontal size.
TODO: bars at the top */
new->desired_height = strut[3];
if (new->desired_height == 0) {
LOG("Client wanted to be 0 pixels high, using the window's height (%d)\n", height);
new->desired_height = height;
}
LOG("the client wants to be %d pixels high\n", new->desired_height);
} else {
LOG("The client didn't specify space to reserve at the screen edge, using its height (%d)\n", height);
new->desired_height = height;
}
}
/* Focus the new window if we’re not in fullscreen mode and if it is not a dock window */
if (CUR_CELL->workspace->fullscreen_client == NULL) {
if (!new->dock) {
CUR_CELL->currently_focused = new;
xcb_set_input_focus(conn, XCB_INPUT_FOCUS_POINTER_ROOT, new->child, XCB_CURRENT_TIME);
}
} else {
/* If we are in fullscreen, we should lower the window to not be annoying */
uint32_t values[] = { XCB_STACK_MODE_BELOW };
xcb_configure_window(conn, new->frame, XCB_CONFIG_WINDOW_STACK_MODE, values);
}
/* Insert into the currently active container, if it’s not a dock window */
if (!new->dock) {
/* Insert after the old active client, if existing. If it does not exist, the
container is empty and it does not matter, where we insert it */
if (old_focused != NULL)
if (old_focused != NULL && !old_focused->dock)
CIRCLEQ_INSERT_AFTER(&(CUR_CELL->clients), old_focused, new, clients);
else CIRCLEQ_INSERT_TAIL(&(CUR_CELL->clients), new, clients);
@ -408,10 +416,6 @@ int main(int argc, char *argv[], char *env[]) {
it any longer. Usually, the client destroys the window shortly afterwards. */
xcb_event_set_unmap_notify_handler(&evenths, handle_unmap_notify_event, NULL);
/* Destroy notify is a step further than unmap notify. We handle it to make sure
that windows whose unmap notify was falsely ignored will get deleted properly */
xcb_event_set_destroy_notify_handler(&evenths, handle_destroy_notify_event, NULL);
/* Configure notify = window’s configuration (geometry, stacking, …). We only need
it to set up ignore the following enter_notify events */
xcb_event_set_configure_notify_handler(&evenths, handle_configure_event, NULL);