code.delx.au - pulseaudio/blob - src/pulsecore/thread-mq.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2006 Lennart Poettering
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as
   8   published by the Free Software Foundation; either version 2.1 of the
   9   License, or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public
  17   License along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <unistd.h>
  27 #include <errno.h>
  28
  29 #include <pulse/xmalloc.h>
  30
  31 #include <pulsecore/atomic.h>
  32 #include <pulsecore/once.h>
  33 #include <pulsecore/log.h>
  34 #include <pulsecore/thread.h>
  35 #include <pulsecore/semaphore.h>
  36 #include <pulsecore/macro.h>
  37 #include <pulsecore/core-util.h>
  38 #include <pulsecore/flist.h>
  39
  40 #include "thread-mq.h"
  41
  42 PA_STATIC_TLS_DECLARE_NO_FREE(thread_mq);
  43
  44 static void asyncmsgq_read_cb(pa_mainloop_api*api, pa_io_event* e, int fd, pa_io_event_flags_t events, void *userdata) {
  45     pa_thread_mq *q = userdata;
  46     pa_asyncmsgq *aq;
  47
  48     pa_assert(pa_asyncmsgq_read_fd(q->outq) == fd);
  49     pa_assert(events == PA_IO_EVENT_INPUT);
  50
  51     pa_asyncmsgq_ref(aq = q->outq);
  52     pa_asyncmsgq_write_after_poll(aq);
  53
  54     for (;;) {
  55         pa_msgobject *object;
  56         int code;
  57         void *data;
  58         int64_t offset;
  59         pa_memchunk chunk;
  60
  61         /* Check whether there is a message for us to process */
  62         while (pa_asyncmsgq_get(aq, &object, &code, &data, &offset, &chunk, 0) == 0) {
  63             int ret;
  64
  65             ret = pa_asyncmsgq_dispatch(object, code, data, offset, &chunk);
  66             pa_asyncmsgq_done(aq, ret);
  67         }
  68
  69         if (pa_asyncmsgq_read_before_poll(aq) == 0)
  70             break;
  71     }
  72
  73     pa_asyncmsgq_unref(aq);
  74 }
  75
  76 static void asyncmsgq_write_cb(pa_mainloop_api*api, pa_io_event* e, int fd, pa_io_event_flags_t events, void *userdata) {
  77     pa_thread_mq *q = userdata;
  78
  79     pa_assert(pa_asyncmsgq_write_fd(q->inq) == fd);
  80     pa_assert(events == PA_IO_EVENT_INPUT);
  81
  82     pa_asyncmsgq_write_after_poll(q->inq);
  83     pa_asyncmsgq_write_before_poll(q->inq);
  84 }
  85
  86 void pa_thread_mq_init(pa_thread_mq *q, pa_mainloop_api *mainloop, pa_rtpoll *rtpoll) {
  87     pa_assert(q);
  88     pa_assert(mainloop);
  89
  90     q->mainloop = mainloop;
  91     pa_assert_se(q->inq = pa_asyncmsgq_new(0));
  92     pa_assert_se(q->outq = pa_asyncmsgq_new(0));
  93
  94     pa_assert_se(pa_asyncmsgq_read_before_poll(q->outq) == 0);
  95     pa_assert_se(q->read_event = mainloop->io_new(mainloop, pa_asyncmsgq_read_fd(q->outq), PA_IO_EVENT_INPUT, asyncmsgq_read_cb, q));
  96
  97     pa_asyncmsgq_write_before_poll(q->inq);
  98     pa_assert_se(q->write_event = mainloop->io_new(mainloop, pa_asyncmsgq_write_fd(q->inq), PA_IO_EVENT_INPUT, asyncmsgq_write_cb, q));
  99
 100     pa_rtpoll_item_new_asyncmsgq_read(rtpoll, PA_RTPOLL_EARLY, q->inq);
 101     pa_rtpoll_item_new_asyncmsgq_write(rtpoll, PA_RTPOLL_LATE, q->outq);
 102 }
 103
 104 void pa_thread_mq_done(pa_thread_mq *q) {
 105     pa_assert(q);
 106
 107     q->mainloop->io_free(q->read_event);
 108     q->mainloop->io_free(q->write_event);
 109     q->read_event = q->write_event = NULL;
 110
 111     pa_asyncmsgq_unref(q->inq);
 112     pa_asyncmsgq_unref(q->outq);
 113     q->inq = q->outq = NULL;
 114
 115     q->mainloop = NULL;
 116 }
 117
 118 void pa_thread_mq_install(pa_thread_mq *q) {
 119     pa_assert(q);
 120
 121     pa_assert(!(PA_STATIC_TLS_GET(thread_mq)));
 122     PA_STATIC_TLS_SET(thread_mq, q);
 123 }
 124
 125 pa_thread_mq *pa_thread_mq_get(void) {
 126     return PA_STATIC_TLS_GET(thread_mq);
 127 }