code.delx.au - pulseaudio/blob - src/polyp/operation.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio 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   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with polypaudio; 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 <assert.h>
  27
  28 #include <polyp/xmalloc.h>
  29
  30 #include "internal.h"
  31 #include "operation.h"
  32
  33 pa_operation *pa_operation_new(pa_context *c, pa_stream *s, pa_operation_cb_t cb, void *userdata) {
  34     pa_operation *o;
  35     assert(c);
  36
  37     o = pa_xnew(pa_operation, 1);
  38     o->ref = 1;
  39     o->context = c;
  40     o->stream = s;
  41
  42     o->state = PA_OPERATION_RUNNING;
  43     o->callback = cb;
  44     o->userdata = userdata;
  45
  46     /* Refcounting is strictly one-way: from the "bigger" to the "smaller" object. */
  47     PA_LLIST_PREPEND(pa_operation, c->operations, o);
  48     pa_operation_ref(o);
  49
  50     return o;
  51 }
  52
  53 pa_operation *pa_operation_ref(pa_operation *o) {
  54     assert(o);
  55     assert(o->ref >= 1);
  56
  57     o->ref++;
  58     return o;
  59 }
  60
  61 void pa_operation_unref(pa_operation *o) {
  62     assert(o);
  63     assert(o->ref >= 1);
  64
  65     if ((--(o->ref)) == 0) {
  66         assert(!o->context);
  67         assert(!o->stream);
  68         pa_xfree(o);
  69     }
  70 }
  71
  72 static void operation_set_state(pa_operation *o, pa_operation_state_t st) {
  73     assert(o);
  74     assert(o->ref >= 1);
  75
  76     if (st == o->state)
  77         return;
  78
  79     o->state = st;
  80
  81     if ((o->state == PA_OPERATION_DONE) || (o->state == PA_OPERATION_CANCELED)) {
  82
  83         if (o->context) {
  84             assert(o->ref >= 2);
  85
  86             PA_LLIST_REMOVE(pa_operation, o->context->operations, o);
  87             pa_operation_unref(o);
  88         }
  89
  90         o->context = NULL;
  91         o->stream = NULL;
  92         o->callback = NULL;
  93         o->userdata = NULL;
  94     }
  95 }
  96
  97 void pa_operation_cancel(pa_operation *o) {
  98     assert(o);
  99     assert(o->ref >= 1);
 100
 101     operation_set_state(o, PA_OPERATION_CANCELED);
 102 }
 103
 104 void pa_operation_done(pa_operation *o) {
 105     assert(o);
 106     assert(o->ref >= 1);
 107
 108     operation_set_state(o, PA_OPERATION_DONE);
 109 }
 110
 111 pa_operation_state_t pa_operation_get_state(pa_operation *o) {
 112     assert(o);
 113     assert(o->ref >= 1);
 114
 115     return o->state;
 116 }