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