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/* purple
 *
 * Purple is the legal property of its developers, whose names are too numerous
 * to list here.  Please refer to the COPYRIGHT file distributed with this
 * source distribution.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
 */

#ifndef _PURPLE_EVENTLOOP_H_
#define _PURPLE_EVENTLOOP_H_
/**
 * SECTION:eventloop
 * @section_id: libpurple-eventloop
 * @short_description: <filename>eventloop.h</filename>
 * @title: Event Loop API
 */

#include <glib.h>
#include <glib-object.h>

/**
 * PurpleInputCondition:
 * @PURPLE_INPUT_READ:  A read condition.
 * @PURPLE_INPUT_WRITE: A write condition.
 *
 * An input condition.
 */
typedef enum
{
	PURPLE_INPUT_READ  = 1 << 0,
	PURPLE_INPUT_WRITE = 1 << 1

} PurpleInputCondition;

/**
 * PurpleInputFunction:
 *
 * The type of callbacks to handle events on file descriptors, as passed to
 * purple_input_add().  The callback will receive the @user_data passed to
 * purple_input_add(), the file descriptor on which the event occurred, and the
 * condition that was satisfied to cause the callback to be invoked.
 */
typedef void (*PurpleInputFunction)(gpointer, gint, PurpleInputCondition);

G_BEGIN_DECLS

/**************************************************************************/
/* Event Loop API                                                         */
/**************************************************************************/

/**
 * purple_timeout_add:
 * @interval: The time between calls of the function, in milliseconds.
 * @function: (scope call): The function to call.
 * @data:     data to pass to @function.
 *
 * Creates a callback timer.
 *
 * The timer will repeat until the function returns %FALSE. The
 * first call will be at the end of the first interval.
 *
 * If the timer is in a multiple of seconds, use purple_timeout_add_seconds()
 * instead as it allows UIs to group timers for power efficiency.
 *
 * Returns: A handle to the timer which can be passed to
 *         purple_timeout_remove() to remove the timer.
 */
guint purple_timeout_add(guint interval, GSourceFunc function, gpointer data);

/**
 * purple_timeout_add_seconds:
 * @interval: The time between calls of the function, in seconds.
 * @function: (scope call): The function to call.
 * @data:     data to pass to @function.
 *
 * Creates a callback timer.
 *
 * The timer will repeat until the function returns %FALSE. The
 * first call will be at the end of the first interval.
 *
 * This function allows UIs to group timers for better power efficiency.  For
 * this reason, @interval may be rounded by up to a second.
 *
 * Returns: A handle to the timer which can be passed to
 *         purple_timeout_remove() to remove the timer.
 */
guint purple_timeout_add_seconds(guint interval, GSourceFunc function, gpointer data);

/**
 * purple_timeout_remove:
 * @handle: The handle, as returned by purple_timeout_add().
 *
 * Removes a timeout handler.
 *
 * Returns: %TRUE if the handler was successfully removed.
 */
gboolean purple_timeout_remove(guint handle);

/**
 * purple_input_add:
 * @fd:        The input file descriptor.
 * @cond:      The condition type.
 * @func:      (scope call): The callback function for data.
 * @user_data: User-specified data.
 *
 * Adds an input handler.
 *
 * See g_io_add_watch_full().
 *
 * Returns: The resulting handle (will be greater than 0).
 */
guint purple_input_add(int fd, PurpleInputCondition cond,
                       PurpleInputFunction func, gpointer user_data);

/**
 * purple_input_remove:
 * @handle: The handle of the input handler. Note that this is the return
 *          value from purple_input_add(), <emphasis>not</emphasis> the
 *          file descriptor.
 *
 * Removes an input handler.
 */
gboolean purple_input_remove(guint handle);

/**
 * purple_input_pipe:
 * @pipefd: Array used to return file descriptors for both ends of pipe.
 *
 * Creates a pipe - an unidirectional data channel that can be used for
 * interprocess communication.
 *
 * File descriptors for both ends of pipe will be written into provided array.
 * The first one (pipefd[0]) can be used for reading, the second one (pipefd[1])
 * for writing.
 *
 * On Windows it's simulated by creating a pair of connected sockets, on other
 * systems pipe() is used.
 *
 * Returns: 0 on success, -1 on error.
 */
int
purple_input_pipe(int pipefd[2]);

G_END_DECLS

#endif /* _PURPLE_EVENTLOOP_H_ */