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Fix race conditions when managing a window

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Since it takes some time for EXWM to create a buffer for a window (to do some
checking for example), the window may send several MapRequest events before
it's mapped. This commit should fix such issue.
This commit is contained in:
Chris Feng 2015-08-07 21:52:34 +08:00
parent 84f0f0328b
commit 14628a940c
1 changed files with 13 additions and 1 deletions
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14
exwm-manage.el
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@ -42,19 +42,28 @@ corresponding buffer.")
(when reply ;nil when destroyed
(setq exwm--geometry reply))))))
(defvar exwm-manage--manage-window-queue nil
"List of window IDs to prevent race conditions.")
(defun exwm-manage--manage-window (id)
"Manage window ID."
(exwm--log "Try to manage #x%x" id)
(setq exwm-input--focus-lock t)
(catch 'return
;; Ensure it's not managed
(when (assoc id exwm--id-buffer-alist)
(when (or (assoc id exwm--id-buffer-alist)
(memq id exwm-manage--manage-window-queue))
(exwm--log "#x%x is already managed" id)
(throw 'return 'managed))
(push id exwm-manage--manage-window-queue) ;prevent reentering
;; Ensure it's alive
(when (xcb:+request-checked+request-check exwm--connection
(make-instance 'xcb:ChangeWindowAttributes
:window id :value-mask xcb:CW:EventMask
:event-mask exwm--client-event-mask))
(delq id exwm-manage--manage-window-queue) ;cleanup
(throw 'return 'dead))
(delq id exwm-manage--manage-window-queue) ;cleanup (late enough)
(with-current-buffer (generate-new-buffer "*EXWM*")
(push `(,id . ,(current-buffer)) exwm--id-buffer-alist)
(exwm-mode)
@ -73,6 +82,7 @@ corresponding buffer.")
(and exwm-instance-name
(string-prefix-p "sun-awt-X11-" exwm-instance-name)
(not (string-suffix-p "XFramePeer" exwm-instance-name))))
(exwm--log "No need to manage #x%x" id)
;; Remove all events
(xcb:+request-checked+request-check exwm--connection
(make-instance 'xcb:ChangeWindowAttributes
@ -104,6 +114,7 @@ corresponding buffer.")
(kill-buffer (current-buffer))
(throw 'return 'ignored))
;; Manage the window
(exwm--log "Manage #x%x" id)
(xcb:+request exwm--connection ;remove border
(make-instance 'xcb:ConfigureWindow
:window id :value-mask xcb:ConfigWindow:BorderWidth
@ -140,6 +151,7 @@ corresponding buffer.")
(defun exwm-manage--unmanage-window (id &optional withdraw-only)
"Unmanage window ID."
(let ((buffer (exwm--id->buffer id)))
(exwm--log "Unmanage #x%x (buffer: %s)" id buffer)
(setq exwm--id-buffer-alist (assq-delete-all id exwm--id-buffer-alist))
(when (buffer-live-p buffer)
(with-current-buffer buffer