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wl_signal(3) Wayland wl_signal(3)

NAME

wl_signal - A source of a type of observable event.

SYNOPSIS

#include <wayland-server-core.h>

Public Member Functions


static void wl_signal_init (struct wl_signal *signal)
static void wl_signal_add (struct wl_signal *signal, struct wl_listener *listener)
static struct wl_listener * wl_signal_get (struct wl_signal *signal, wl_notify_func_t notify)
static void wl_signal_emit (struct wl_signal *signal, void *data)

Data Fields


struct wl_list listener_list

Detailed Description

A source of a type of observable event.

Signals are recognized points where significant events can be observed. Compositors as well as the server can provide signals. Observers are wl_listener's that are added through wl_signal_add. Signals are emitted using wl_signal_emit, which will invoke all listeners until that listener is removed by wl_list_remove() (or whenever the signal is destroyed).

See also:

wl_listener for more information on using wl_signal

Member Function Documentation

static void wl_signal_add (struct wl_signal * signal, struct wl_listener * listener) [inline]

Add the specified listener to this signal.

Parameters:

signal The signal that will emit events to the listener
listener The listener to add

static void wl_signal_emit (struct wl_signal * signal, void * data) [inline]

Emits this signal, notifying all registered listeners.

Parameters:

signal The signal object that will emit the signal
data The data that will be emitted with the signal

static struct wl_listener * wl_signal_get (struct wl_signal * signal, wl_notify_func_t notify)

Gets the listener struct for the specified callback.

Parameters:

signal The signal that contains the specified listener
notify The listener that is the target of this search

Returns:

the list item that corresponds to the specified listener, or NULL if none was found

static void wl_signal_init (struct wl_signal * signal) [inline]

Initialize a new wl_signal for use.

Parameters:

signal The signal that will be initialized

Field Documentation

struct wl_list wl_signal::listener_list

Author

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Mon Oct 22 2018 Version 1.16.0