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       1                 :            : /***
       2                 :            :   This file is part of PulseAudio.
       3                 :            : 
       4                 :            :   Copyright 2004-2006 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 published
       8                 :            :   by the Free Software Foundation; either version 2.1 of the License,
       9                 :            :   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                 :            :   General Public License for more details.
      15                 :            : 
      16                 :            :   You should have received a copy of the GNU Lesser General Public License
      17                 :            :   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 <pulse/xmalloc.h>
      27                 :            : #include <pulsecore/macro.h>
      28                 :            : #include <pulsecore/flist.h>
      29                 :            : 
      30                 :            : #include "internal.h"
      31                 :            : #include "operation.h"
      32                 :            : 
      33 [ -  + ][ #  # ]:         27 : PA_STATIC_FLIST_DECLARE(operations, 0, pa_xfree);
      34                 :            : 
      35                 :          0 : pa_operation *pa_operation_new(pa_context *c, pa_stream *s, pa_operation_cb_t cb, void *userdata) {
      36                 :            :     pa_operation *o;
      37         [ #  # ]:          0 :     pa_assert(c);
      38                 :            : 
      39         [ #  # ]:          0 :     if (!(o = pa_flist_pop(PA_STATIC_FLIST_GET(operations))))
      40                 :          0 :         o = pa_xnew(pa_operation, 1);
      41                 :            : 
      42                 :          0 :     PA_REFCNT_INIT(o);
      43                 :          0 :     o->context = c;
      44                 :          0 :     o->stream = s;
      45                 :          0 :     o->private = NULL;
      46                 :            : 
      47                 :          0 :     o->state = PA_OPERATION_RUNNING;
      48                 :          0 :     o->callback = cb;
      49                 :          0 :     o->userdata = userdata;
      50                 :            : 
      51                 :            :     /* Refcounting is strictly one-way: from the "bigger" to the "smaller" object. */
      52 [ #  # ][ #  # ]:          0 :     PA_LLIST_PREPEND(pa_operation, c->operations, o);
      53                 :          0 :     pa_operation_ref(o);
      54                 :            : 
      55                 :          0 :     return o;
      56                 :            : }
      57                 :            : 
      58                 :          0 : pa_operation *pa_operation_ref(pa_operation *o) {
      59         [ #  # ]:          0 :     pa_assert(o);
      60         [ #  # ]:          0 :     pa_assert(PA_REFCNT_VALUE(o) >= 1);
      61                 :            : 
      62                 :          0 :     PA_REFCNT_INC(o);
      63                 :          0 :     return o;
      64                 :            : }
      65                 :            : 
      66                 :          0 : void pa_operation_unref(pa_operation *o) {
      67         [ #  # ]:          0 :     pa_assert(o);
      68         [ #  # ]:          0 :     pa_assert(PA_REFCNT_VALUE(o) >= 1);
      69                 :            : 
      70         [ #  # ]:          0 :     if (PA_REFCNT_DEC(o) <= 0) {
      71         [ #  # ]:          0 :         pa_assert(!o->context);
      72         [ #  # ]:          0 :         pa_assert(!o->stream);
      73                 :            : 
      74         [ #  # ]:          0 :         if (pa_flist_push(PA_STATIC_FLIST_GET(operations), o) < 0)
      75                 :          0 :             pa_xfree(o);
      76                 :            :     }
      77                 :          0 : }
      78                 :            : 
      79                 :          0 : static void operation_unlink(pa_operation *o) {
      80         [ #  # ]:          0 :     pa_assert(o);
      81                 :            : 
      82         [ #  # ]:          0 :     if (o->context) {
      83         [ #  # ]:          0 :         pa_assert(PA_REFCNT_VALUE(o) >= 2);
      84                 :            : 
      85 [ #  # ][ #  # ]:          0 :         PA_LLIST_REMOVE(pa_operation, o->context->operations, o);
         [ #  # ][ #  # ]
      86                 :          0 :         pa_operation_unref(o);
      87                 :            : 
      88                 :          0 :         o->context = NULL;
      89                 :            :     }
      90                 :            : 
      91                 :          0 :     o->stream = NULL;
      92                 :          0 :     o->callback = NULL;
      93                 :          0 :     o->userdata = NULL;
      94                 :          0 : }
      95                 :            : 
      96                 :          0 : static void operation_set_state(pa_operation *o, pa_operation_state_t st) {
      97         [ #  # ]:          0 :     pa_assert(o);
      98         [ #  # ]:          0 :     pa_assert(PA_REFCNT_VALUE(o) >= 1);
      99                 :            : 
     100         [ #  # ]:          0 :     if (st == o->state)
     101                 :          0 :         return;
     102                 :            : 
     103                 :          0 :     pa_operation_ref(o);
     104                 :            : 
     105                 :          0 :     o->state = st;
     106                 :            : 
     107         [ #  # ]:          0 :     if ((o->state == PA_OPERATION_DONE) || (o->state == PA_OPERATION_CANCELED))
     108                 :          0 :         operation_unlink(o);
     109                 :            : 
     110                 :          0 :     pa_operation_unref(o);
     111                 :            : }
     112                 :            : 
     113                 :          0 : void pa_operation_cancel(pa_operation *o) {
     114         [ #  # ]:          0 :     pa_assert(o);
     115         [ #  # ]:          0 :     pa_assert(PA_REFCNT_VALUE(o) >= 1);
     116                 :            : 
     117                 :          0 :     operation_set_state(o, PA_OPERATION_CANCELED);
     118                 :          0 : }
     119                 :            : 
     120                 :          0 : void pa_operation_done(pa_operation *o) {
     121         [ #  # ]:          0 :     pa_assert(o);
     122         [ #  # ]:          0 :     pa_assert(PA_REFCNT_VALUE(o) >= 1);
     123                 :            : 
     124                 :          0 :     operation_set_state(o, PA_OPERATION_DONE);
     125                 :          0 : }
     126                 :            : 
     127                 :          0 : pa_operation_state_t pa_operation_get_state(pa_operation *o) {
     128         [ #  # ]:          0 :     pa_assert(o);
     129         [ #  # ]:          0 :     pa_assert(PA_REFCNT_VALUE(o) >= 1);
     130                 :            : 
     131                 :          0 :     return o->state;
     132                 :            : }