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#ifndef foopulsertpollhfoo
#define foopulsertpollhfoo
/* $Id$ */
/***
This file is part of PulseAudio.
Copyright 2004-2006 Lennart Poettering
PulseAudio 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.
PulseAudio 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 PulseAudio; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA.
***/
#include <sys/types.h>
#include <limits.h>
#include <pulse/sample.h>
#include <pulsecore/asyncmsgq.h>
#include <pulsecore/fdsem.h>
#include <pulsecore/macro.h>
/* An implementation of a "real-time" poll loop. Basically, this is
* yet another wrapper around poll(). However it has certain
* advantages over pa_mainloop and suchlike:
*
* 1) It uses timer_create() and POSIX real time signals to guarantee
* optimal high-resolution timing. Starting with Linux 2.6.21 hrtimers
* are available, and since right now only nanosleep() and the POSIX
* clock and timer interfaces have been ported to hrtimers (and not
* ppoll/pselect!) we have to combine ppoll() with timer_create(). The
* fact that POSIX timers and POSIX rt signals are used internally is
* completely hidden.
*
* 2) It allows raw access to the pollfd data to users
*
* 3) It allows arbitrary functions to be run before entering the
* actual poll() and after it.
*
* Only a single interval timer is supported..*/
typedef struct pa_rtpoll pa_rtpoll;
typedef struct pa_rtpoll_item pa_rtpoll_item;
typedef enum pa_rtpoll_priority {
PA_RTPOLL_EARLY = -100, /* For veeery important stuff, like handling control messages */
PA_RTPOLL_NORMAL = 0, /* For normal stuff */
PA_RTPOLL_LATE = +100, /* For housekeeping */
PA_RTPOLL_NEVER = INT_MAX, /* For stuff that doesn't register any callbacks, but only fds to listen on */
} pa_rtpoll_priority_t;
pa_rtpoll *pa_rtpoll_new(void);
void pa_rtpoll_free(pa_rtpoll *p);
/* Install the rtpoll in the current thread */
void pa_rtpoll_install(pa_rtpoll *p);
/* Sleep on the rtpoll until the time event, or any of the fd events
* is triggered. If "wait" is 0 we don't sleep but only update the
* struct pollfd. Returns negative on error, positive if the loop
* should continue to run, 0 when the loop should be terminated
* cleanly. */
int pa_rtpoll_run(pa_rtpoll *f, pa_bool_t wait);
void pa_rtpoll_set_timer_absolute(pa_rtpoll *p, const struct timeval *ts);
void pa_rtpoll_set_timer_periodic(pa_rtpoll *p, pa_usec_t usec);
void pa_rtpoll_set_timer_relative(pa_rtpoll *p, pa_usec_t usec);
void pa_rtpoll_set_timer_disabled(pa_rtpoll *p);
/* A new fd wakeup item for pa_rtpoll */
pa_rtpoll_item *pa_rtpoll_item_new(pa_rtpoll *p, pa_rtpoll_priority_t prio, unsigned n_fds);
void pa_rtpoll_item_free(pa_rtpoll_item *i);
/* Please note that this pointer might change on every call and when
* pa_rtpoll_run() is called. Hence: call this immediately before
* using the pointer and don't save the result anywhere */
struct pollfd *pa_rtpoll_item_get_pollfd(pa_rtpoll_item *i, unsigned *n_fds);
/* Set the callback that shall be called when there's time to do some work: If the
* callback returns a value > 0, the poll is skipped and the next
* iteraton of the loop will start immediately. */
void pa_rtpoll_item_set_work_callback(pa_rtpoll_item *i, int (*work_cb)(pa_rtpoll_item *i));
/* Set the callback that shall be called immediately before entering
* the sleeping poll: If the callback returns a value > 0, the poll is
* skipped and the next iteraton of the loop will start
* immediately.. */
void pa_rtpoll_item_set_before_callback(pa_rtpoll_item *i, int (*before_cb)(pa_rtpoll_item *i));
/* Set the callback that shall be called immediately after having
* entered the sleeping poll */
void pa_rtpoll_item_set_after_callback(pa_rtpoll_item *i, void (*after_cb)(pa_rtpoll_item *i));
void pa_rtpoll_item_set_userdata(pa_rtpoll_item *i, void *userdata);
void* pa_rtpoll_item_get_userdata(pa_rtpoll_item *i);
pa_rtpoll_item *pa_rtpoll_item_new_fdsem(pa_rtpoll *p, pa_rtpoll_priority_t prio, pa_fdsem *s);
pa_rtpoll_item *pa_rtpoll_item_new_asyncmsgq(pa_rtpoll *p, pa_rtpoll_priority_t prio, pa_asyncmsgq *q);
/* Requests the loop to exit. Will cause the next iteration of
* pa_rtpoll_run() to return 0 */
void pa_rtpoll_quit(pa_rtpoll *p);
#endif
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