1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
#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 <poll.h>
#include <sys/types.h>
#include <pulse/sample.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;
pa_rtpoll *pa_rtpoll_new(void);
void pa_rtpoll_free(pa_rtpoll *p);
void pa_rtpoll_install(pa_rtpoll *p);
int pa_rtpoll_run(pa_rtpoll *f);
void pa_rtpoll_set_itimer(pa_rtpoll *p, pa_usec_t usec);
pa_rtpoll_item *pa_rtpoll_item_new(pa_rtpoll *p, unsigned n_fds);
void pa_rtpoll_item_free(pa_rtpoll_item *i);
struct pollfd *pa_rtpoll_item_get_pollfd(pa_rtpoll_item *i, unsigned *n_fds);
void pa_rtpoll_item_set_before_callback(pa_rtpoll_item *i, int (*before_cb)(pa_rtpoll_item *i));
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);
#endif
|
