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 <polypcore/xmalloc.h>
  29
  30 #include "internal.h"
  31
  32 #include "operation.h"
  33
  34 pa_operation *pa_operation_new(pa_context *c, pa_stream *s, pa_operation_cb_t cb, void *userdata) {
  35     pa_operation *o;
  36     assert(c);
  37
  38     o = pa_xmalloc(sizeof(pa_operation));
  39     o->ref = 1;
  40     o->context = pa_context_ref(c);
  41     o->stream = s ? pa_stream_ref(s) : NULL;
  42
  43     o->state = PA_OPERATION_RUNNING;
  44     o->callback = cb;
  45     o->userdata = userdata;
  46
  47     PA_LLIST_PREPEND(pa_operation, o->context->operations, o);
  48     return pa_operation_ref(o);
  49 }
  50
  51 pa_operation *pa_operation_ref(pa_operation *o) {
  52     assert(o && o->ref >= 1);
  53     o->ref++;
  54     return o;
  55 }
  56
  57 void pa_operation_unref(pa_operation *o) {
  58     assert(o && o->ref >= 1);
  59
  60     if ((--(o->ref)) == 0) {
  61         assert(!o->context);
  62         assert(!o->stream);
  63         free(o);
  64     }
  65 }
  66
  67 static void operation_set_state(pa_operation *o, pa_operation_state_t st) {
  68     assert(o && o->ref >= 1);
  69
  70     if (st == o->state)
  71         return;
  72
  73     if (!o->context)
  74         return;
  75
  76     o->state = st;
  77
  78     if ((o->state == PA_OPERATION_DONE) || (o->state == PA_OPERATION_CANCELED)) {
  79         PA_LLIST_REMOVE(pa_operation, o->context->operations, o);
  80         pa_context_unref(o->context);
  81         if (o->stream)
  82             pa_stream_unref(o->stream);
  83         o->context = NULL;
  84         o->stream = NULL;
  85         o->callback = NULL;
  86         o->userdata = NULL;
  87
  88         pa_operation_unref(o);
  89     }
  90 }
  91
  92 void pa_operation_cancel(pa_operation *o) {
  93     assert(o && o->ref >= 1);
  94     operation_set_state(o, PA_OPERATION_CANCELED);
  95 }
  96
  97 void pa_operation_done(pa_operation *o) {
  98     assert(o && o->ref >= 1);
  99     operation_set_state(o, PA_OPERATION_DONE);
 100 }
 101
 102 pa_operation_state_t pa_operation_get_state(pa_operation *o) {
 103     assert(o && o->ref >= 1);
 104     return o->state;
 105 }