code.delx.au - pulseaudio/blob - src/pulsecore/flist.h

   1 #ifndef foopulseflisthfoo
   2 #define foopulseflisthfoo
   3
   4 /* $Id$ */
   5
   6 /***
   7   This file is part of PulseAudio.
   8
   9   Copyright 2006 Lennart Poettering
  10
  11   PulseAudio is free software; you can redistribute it and/or modify
  12   it under the terms of the GNU Lesser General Public License as
  13   published by the Free Software Foundation; either version 2 of the
  14   License, or (at your option) any later version.
  15
  16   PulseAudio is distributed in the hope that it will be useful, but
  17   WITHOUT ANY WARRANTY; without even the implied warranty of
  18   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  19   General Public License for more details.
  20
  21   You should have received a copy of the GNU Lesser General Public
  22   License along with PulseAudio; if not, write to the Free Software
  23   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  24   USA.
  25 ***/
  26
  27 #include <pulse/def.h>
  28
  29 #include <pulsecore/once.h>
  30 #include <pulsecore/gccmacro.h>
  31
  32 /* A multiple-reader multipler-write lock-free free list implementation */
  33
  34 typedef struct pa_flist pa_flist;
  35
  36 /* Size is required to be a power of two, or 0 for the default size */
  37 pa_flist * pa_flist_new(unsigned size);
  38 void pa_flist_free(pa_flist *l, pa_free_cb_t free_cb);
  39
  40 /* Please note that this routine might fail! */
  41 int pa_flist_push(pa_flist*l, void *p);
  42 void* pa_flist_pop(pa_flist*l);
  43
  44 /* Please not that the destructor stuff is not really necesary, we do
  45  * this just to make valgrind output more useful. */
  46
  47 #define PA_STATIC_FLIST_DECLARE(name, size, free_cb)                    \
  48     static struct {                                                     \
  49         pa_flist *flist;                                                \
  50         pa_once once;                                                   \
  51     } name##_flist = { NULL, PA_ONCE_INIT };                            \
  52     static void name##_flist_init(void) {                               \
  53         name##_flist.flist = pa_flist_new(size);                        \
  54     }                                                                   \
  55     static inline pa_flist* name##_flist_get(void) {                    \
  56         pa_run_once(&name##_flist.once, name##_flist_init);             \
  57         return name##_flist.flist;                                      \
  58     }                                                                   \
  59     static void name##_flist_destructor(void) PA_GCC_DESTRUCTOR;        \
  60     static void name##_flist_destructor(void) {                         \
  61         if (name##_flist.flist)                                         \
  62             pa_flist_free(name##_flist.flist, (free_cb));               \
  63     }                                                                   \
  64     struct __stupid_useless_struct_to_allow_trailing_semicolon
  65
  66 #define PA_STATIC_FLIST_GET(name) (name##_flist_get())
  67
  68 #endif