util/module.c

   1 /*
   2  * QEMU Module Infrastructure
   3  *
   4  * Copyright IBM, Corp. 2009
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  * Contributions after 2012-01-13 are licensed under the terms of the
  13  * GNU GPL, version 2 or (at your option) any later version.
  14  */
  15
  16 #include "qemu-common.h"
  17 #include "qemu/queue.h"
  18 #include "qemu/module.h"
  19
  20 typedef struct ModuleEntry
  21 {
  22     void (*init)(void);
  23     QTAILQ_ENTRY(ModuleEntry) node;
  24 } ModuleEntry;
  25
  26 typedef QTAILQ_HEAD(, ModuleEntry) ModuleTypeList;
  27
  28 static ModuleTypeList init_type_list[MODULE_INIT_MAX];
  29
  30 static void init_types(void)
  31 {
  32     static int inited;
  33     int i;
  34
  35     if (inited) {
  36         return;
  37     }
  38
  39     for (i = 0; i < MODULE_INIT_MAX; i++) {
  40         QTAILQ_INIT(&init_type_list[i]);
  41     }
  42
  43     inited = 1;
  44 }
  45
  46
  47 static ModuleTypeList *find_type(module_init_type type)
  48 {
  49     ModuleTypeList *l;
  50
  51     init_types();
  52
  53     l = &init_type_list[type];
  54
  55     return l;
  56 }
  57
  58 void register_module_init(void (*fn)(void), module_init_type type)
  59 {
  60     ModuleEntry *e;
  61     ModuleTypeList *l;
  62
  63     e = g_malloc0(sizeof(*e));
  64     e->init = fn;
  65
  66     l = find_type(type);
  67
  68     QTAILQ_INSERT_TAIL(l, e, node);
  69 }
  70
  71 void module_call_init(module_init_type type)
  72 {
  73     ModuleTypeList *l;
  74     ModuleEntry *e;
  75
  76     l = find_type(type);
  77
  78     QTAILQ_FOREACH(e, l, node) {
  79         e->init();
  80     }
  81 }