code.delx.au - pulseaudio/blob - polyp/mainloop-api.h

   1 #ifndef foomainloopapihfoo
   2 #define foomainloopapihfoo
   3
   4 /* $Id$ */
   5
   6 /***
   7   This file is part of polypaudio.
   8
   9   polypaudio is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU General Public License as published
  11   by the Free Software Foundation; either version 2 of the License,
  12   or (at your option) any later version.
  13
  14   polypaudio is distributed in the hope that it will be useful, but
  15   WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17   General Public License for more details.
  18
  19   You should have received a copy of the GNU General Public License
  20   along with polypaudio; if not, write to the Free Software
  21   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22   USA.
  23 ***/
  24
  25 #include <sys/time.h>
  26 #include <time.h>
  27
  28 #include "cdecl.h"
  29
  30 /** \file
  31  *
  32  * Main loop abstraction layer. Both the polypaudio core and the
  33  * polypaudio client library use a main loop abstraction layer. Due to
  34  * this it is possible to embed polypaudio into other
  35  * applications easily. Two main loop implemenations are
  36  * currently available:
  37  * \li A minimal implementation based on the C library's poll() function (See \ref mainloop.h)
  38  * \li A wrapper around the GLIB main loop. Use this to embed polypaudio into your GLIB/GTK+/GNOME programs (See \ref glib-mainloop.h)
  39  *
  40  * The structure pa_mainloop_api is used as vtable for the main loop abstraction.
  41  *
  42  * This mainloop abstraction layer has no direct support for UNIX signals. Generic, mainloop implementation agnostic support is available throught \ref mainloop-signal.h.
  43  * */
  44
  45 PA_C_DECL_BEGIN
  46
  47 /** A bitmask for IO events */
  48 enum pa_io_event_flags {
  49     PA_IO_EVENT_NULL = 0,     /**< No event */
  50     PA_IO_EVENT_INPUT = 1,    /**< Input event */
  51     PA_IO_EVENT_OUTPUT = 2,   /**< Output event */
  52     PA_IO_EVENT_HANGUP = 4,   /**< Hangup event */
  53     PA_IO_EVENT_ERROR = 8     /**< Error event */
  54 };
  55
  56 /** \struct pa_io_event
  57  * An opaque IO event source object */
  58 struct pa_io_event;
  59
  60 /** \struct pa_defer_event
  61  * An opaque deferred event source object. Events of this type are triggered once in every main loop iteration */
  62 struct pa_defer_event;
  63
  64 /** \struct pa_time_event
  65  * An opaque timer event source object */
  66 struct pa_time_event;
  67
  68 /** An abstract mainloop API vtable */
  69 struct pa_mainloop_api {
  70     /** A pointer to some private, arbitrary data of the main loop implementation */
  71     void *userdata;
  72
  73     /** Create a new IO event source object */
  74     struct pa_io_event* (*io_new)(struct pa_mainloop_api*a, int fd, enum pa_io_event_flags events, void (*callback) (struct pa_mainloop_api*a, struct pa_io_event* e, int fd, enum pa_io_event_flags events, void *userdata), void *userdata);
  75
  76     /** Enable or disable IO events on this object */
  77     void (*io_enable)(struct pa_io_event* e, enum pa_io_event_flags events);
  78
  79     /** Free a IO event source object */
  80     void (*io_free)(struct pa_io_event* e);
  81
  82     /** Set a function that is called when the IO event source is destroyed. Use this to free the userdata argument if required */
  83     void (*io_set_destroy)(struct pa_io_event *e, void (*callback) (struct pa_mainloop_api*a, struct pa_io_event *e, void *userdata));
  84
  85     /** Create a new timer event source object for the specified Unix time */
  86     struct pa_time_event* (*time_new)(struct pa_mainloop_api*a, const struct timeval *tv, void (*callback) (struct pa_mainloop_api*a, struct pa_time_event* e, const struct timeval *tv, void *userdata), void *userdata);
  87
  88     /** Restart a running or expired timer event source with a new Unix time */
  89     void (*time_restart)(struct pa_time_event* e, const struct timeval *tv);
  90
  91     /** Free a deferred timer event source object */
  92     void (*time_free)(struct pa_time_event* e);
  93
  94     /** Set a function that is called when the timer event source is destroyed. Use this to free the userdata argument if required */
  95     void (*time_set_destroy)(struct pa_time_event *e, void (*callback) (struct pa_mainloop_api*a, struct pa_time_event *e, void *userdata));
  96
  97     /** Create a new deferred event source object */
  98     struct pa_defer_event* (*defer_new)(struct pa_mainloop_api*a, void (*callback) (struct pa_mainloop_api*a, struct pa_defer_event* e, void *userdata), void *userdata);
  99
 100     /** Enable or disable a deferred event source temporarily */
 101     void (*defer_enable)(struct pa_defer_event* e, int b);
 102
 103     /** Free a deferred event source object */
 104     void (*defer_free)(struct pa_defer_event* e);
 105
 106     /** Set a function that is called when the deferred event source is destroyed. Use this to free the userdata argument if required */
 107     void (*defer_set_destroy)(struct pa_defer_event *e, void (*callback) (struct pa_mainloop_api*a, struct pa_defer_event *e, void *userdata));
 108
 109     /** Exit the main loop and return the specfied retval*/
 110     void (*quit)(struct pa_mainloop_api*a, int retval);
 111 };
 112
 113 /** Run the specified callback function once from the main loop using an anonymous defer event. */
 114 void pa_mainloop_api_once(struct pa_mainloop_api*m, void (*callback)(struct pa_mainloop_api*m, void *userdata), void *userdata);
 115
 116 PA_C_DECL_END
 117
 118 #endif