datapath/linux/compat/include/linux/workqueue.h

   1 #ifndef __LINUX_WORKQUEUE_WRAPPER_H
   2 #define __LINUX_WORKQUEUE_WRAPPER_H 1
   3
   4 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
   5 #include_next <linux/workqueue.h>
   6 static inline int __init ovs_workqueues_init(void) { return 0; }
   7 static inline void  ovs_workqueues_exit(void) {}
   8
   9 #else
  10 #include <linux/timer.h>
  11
  12 int __init ovs_workqueues_init(void);
  13 void ovs_workqueues_exit(void);
  14
  15
  16 /* Older kernels have an implementation of work queues with some very bad
  17  * characteristics when trying to cancel work (potential deadlocks, use after
  18  * free, etc.  Therefore we implement simple ovs specific work queue using
  19  * single worker thread. work-queue API are kept similar for compatibility.
  20  */
  21 struct work_struct;
  22
  23 typedef void (*work_func_t)(struct work_struct *work);
  24
  25 #define work_data_bits(work) ((unsigned long *)(&(work)->data))
  26
  27 struct work_struct {
  28 #define WORK_STRUCT_PENDING 0           /* T if work item pending execution */
  29         atomic_long_t data;
  30         struct list_head entry;
  31         work_func_t func;
  32 };
  33
  34 #define WORK_DATA_INIT()        ATOMIC_LONG_INIT(0)
  35
  36 #define work_clear_pending(work)                                \
  37         clear_bit(WORK_STRUCT_PENDING, work_data_bits(work))
  38
  39 struct delayed_work {
  40         struct work_struct work;
  41         struct timer_list timer;
  42 };
  43
  44 #define __WORK_INITIALIZER(n, f) {                              \
  45         .data = WORK_DATA_INIT(),                               \
  46         .entry  = { &(n).entry, &(n).entry },                   \
  47         .func = (f),                                            \
  48 }
  49
  50 #define __DELAYED_WORK_INITIALIZER(n, f) {                      \
  51         .work = __WORK_INITIALIZER((n).work, (f)),              \
  52         .timer = TIMER_INITIALIZER(NULL, 0, 0),                 \
  53 }
  54
  55 #define DECLARE_DELAYED_WORK(n, f)                              \
  56         struct delayed_work n = __DELAYED_WORK_INITIALIZER(n, f)
  57
  58 #define schedule_delayed_work rpl_schedule_delayed_work
  59 int schedule_delayed_work(struct delayed_work *dwork, unsigned long delay);
  60
  61 #define cancel_delayed_work_sync rpl_cancel_delayed_work_sync
  62 int cancel_delayed_work_sync(struct delayed_work *dwork);
  63
  64 #define INIT_WORK(_work, _func)                                 \
  65         do {                                                    \
  66                 (_work)->data = (atomic_long_t) WORK_DATA_INIT();       \
  67                 INIT_LIST_HEAD(&(_work)->entry);                \
  68                 (_work)->func = (_func);                        \
  69         } while (0)
  70
  71 #endif /* kernel version < 2.6.23 */
  72
  73 #endif