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#ifndef foomainloopapihfoo
#define foomainloopapihfoo
/* $Id$ */
/***
This file is part of polypaudio.
polypaudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
polypaudio 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with polypaudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#include <sys/time.h>
#include <time.h>
#include <polyp/cdecl.h>
/** \file
*
* Main loop abstraction layer. Both the polypaudio core and the
* polypaudio client library use a main loop abstraction layer. Due to
* this it is possible to embed polypaudio into other
* applications easily. Two main loop implemenations are
* currently available:
* \li A minimal implementation based on the C library's poll() function (See \ref mainloop.h)
* \li A wrapper around the GLIB main loop. Use this to embed polypaudio into your GLIB/GTK+/GNOME programs (See \ref glib-mainloop.h)
*
* The structure pa_mainloop_api is used as vtable for the main loop abstraction.
*
* This mainloop abstraction layer has no direct support for UNIX signals. Generic, mainloop implementation agnostic support is available throught \ref mainloop-signal.h.
* */
PA_C_DECL_BEGIN
/** A bitmask for IO events */
typedef enum pa_io_event_flags {
PA_IO_EVENT_NULL = 0, /**< No event */
PA_IO_EVENT_INPUT = 1, /**< Input event */
PA_IO_EVENT_OUTPUT = 2, /**< Output event */
PA_IO_EVENT_HANGUP = 4, /**< Hangup event */
PA_IO_EVENT_ERROR = 8 /**< Error event */
} pa_io_event_flags_t;
/** \struct pa_io_event
* An opaque IO event source object */
typedef struct pa_io_event pa_io_event;
/** \struct pa_defer_event
* An opaque deferred event source object. Events of this type are triggered once in every main loop iteration */
typedef struct pa_defer_event pa_defer_event;
/** \struct pa_time_event
* An opaque timer event source object */
typedef struct pa_time_event pa_time_event;
/** An abstract mainloop API vtable */
typedef struct pa_mainloop_api pa_mainloop_api;
struct pa_mainloop_api {
/** A pointer to some private, arbitrary data of the main loop implementation */
void *userdata;
/** Create a new IO event source object */
pa_io_event* (*io_new)(pa_mainloop_api*a, int fd, pa_io_event_flags_t events, void (*callback) (pa_mainloop_api*a, pa_io_event* e, int fd, pa_io_event_flags_t events, void *userdata), void *userdata);
/** Enable or disable IO events on this object */
void (*io_enable)(pa_io_event* e, pa_io_event_flags_t events);
/** Free a IO event source object */
void (*io_free)(pa_io_event* e);
/** Set a function that is called when the IO event source is destroyed. Use this to free the userdata argument if required */
void (*io_set_destroy)(pa_io_event *e, void (*callback) (pa_mainloop_api*a, pa_io_event *e, void *userdata));
/** Create a new timer event source object for the specified Unix time */
pa_time_event* (*time_new)(pa_mainloop_api*a, const struct timeval *tv, void (*callback) (pa_mainloop_api*a, pa_time_event* e, const struct timeval *tv, void *userdata), void *userdata);
/** Restart a running or expired timer event source with a new Unix time */
void (*time_restart)(pa_time_event* e, const struct timeval *tv);
/** Free a deferred timer event source object */
void (*time_free)(pa_time_event* e);
/** Set a function that is called when the timer event source is destroyed. Use this to free the userdata argument if required */
void (*time_set_destroy)(pa_time_event *e, void (*callback) (pa_mainloop_api*a, pa_time_event *e, void *userdata));
/** Create a new deferred event source object */
pa_defer_event* (*defer_new)(pa_mainloop_api*a, void (*callback) (pa_mainloop_api*a, pa_defer_event* e, void *userdata), void *userdata);
/** Enable or disable a deferred event source temporarily */
void (*defer_enable)(pa_defer_event* e, int b);
/** Free a deferred event source object */
void (*defer_free)(pa_defer_event* e);
/** Set a function that is called when the deferred event source is destroyed. Use this to free the userdata argument if required */
void (*defer_set_destroy)(pa_defer_event *e, void (*callback) (pa_mainloop_api*a, pa_defer_event *e, void *userdata));
/** Exit the main loop and return the specfied retval*/
void (*quit)(pa_mainloop_api*a, int retval);
};
/** Run the specified callback function once from the main loop using an anonymous defer event. */
void pa_mainloop_api_once(pa_mainloop_api*m, void (*callback)(pa_mainloop_api*m, void *userdata), void *userdata);
PA_C_DECL_END
#endif
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