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

   1 #ifndef foopulseflisthfoo
   2 #define foopulseflisthfoo
   3
   4 /***
   5   This file is part of PulseAudio.
   6
   7   Copyright 2006-2008 Lennart Poettering
   8
   9   PulseAudio is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU Lesser General Public License as
  11   published by the Free Software Foundation; either version 2 of the
  12   License, or (at your option) any later version.
  13
  14   PulseAudio is distributed in the hope that it will be useful, but
  15   WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17   General Public License for more details.
  18
  19   You should have received a copy of the GNU Lesser General Public
  20   License along with PulseAudio; if not, write to the Free Software
  21   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22   USA.
  23 ***/
  24
  25 #include <pulse/def.h>
  26 #include <pulse/gccmacro.h>
  27
  28 #include <pulsecore/once.h>
  29 #include <pulsecore/core-util.h>
  30
  31 /* A multiple-reader multipler-write lock-free free list implementation */
  32
  33 typedef struct pa_flist pa_flist;
  34
  35 /* Size is required to be a power of two, or 0 for the default size */
  36 pa_flist * pa_flist_new(unsigned size);
  37 void pa_flist_free(pa_flist *l, pa_free_cb_t free_cb);
  38
  39 /* Please note that this routine might fail! */
  40 int pa_flist_push(pa_flist*l, void *p);
  41 void* pa_flist_pop(pa_flist*l);
  42
  43 /* Please not that the destructor stuff is not really necesary, we do
  44  * this just to make valgrind output more useful. */
  45
  46 #define PA_STATIC_FLIST_DECLARE(name, size, free_cb)                    \
  47     static struct {                                                     \
  48         pa_flist *flist;                                                \
  49         pa_once once;                                                   \
  50     } name##_flist = { NULL, PA_ONCE_INIT };                            \
  51     static void name##_flist_init(void) {                               \
  52         name##_flist.flist = pa_flist_new(size);                        \
  53     }                                                                   \
  54     static inline pa_flist* name##_flist_get(void) {                    \
  55         pa_run_once(&name##_flist.once, name##_flist_init);             \
  56         return name##_flist.flist;                                      \
  57     }                                                                   \
  58     static void name##_flist_destructor(void) PA_GCC_DESTRUCTOR;        \
  59     static void name##_flist_destructor(void) {                         \
  60         if (!pa_in_valgrind())                                          \
  61             return;                                                     \
  62         if (name##_flist.flist)                                         \
  63             pa_flist_free(name##_flist.flist, (free_cb));               \
  64     }                                                                   \
  65     struct __stupid_useless_struct_to_allow_trailing_semicolon
  66
  67 #define PA_STATIC_FLIST_GET(name) (name##_flist_get())
  68
  69 #endif