June 1994
Intermediate to advanced
821 pages
24h 40m
English
Content preview from XLIB Programming Manual, Rel. 5, Third EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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F.13 Display Queue Functions
XmuDQCreate creates and returns an empty
XmuDisplayQueue (which is really just a linked list
of displays; it is called a queue for historical reasons). The queue is
initially empty, but displays can be added using
XmuDQAddDisplay. Functions can be added for each
display, to be called when the display connection is closed. These are
called close callbacks. Functions can also be added to be called when
the last display connection is closed. These are called free callbacks.
The application is responsible for actually freeing the queue, by
calling XmuDQDestroy.
XmuDQAddDisplay does not attempt to prevent
duplicate entries in the queue; the caller should use
XmuDQLookupDisplay to determine if a display has
already been added to a queue. The XmuDQNDisplays
macro returns the number of displays in the specified queue.
XmuDQRemoveDisplay removes the specified display from
the specified queue, without calling its close callbacks.
XmuDQDestroy releases all memory associated with the
specified queue and optionally calls the close callbacks for each
display.
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