include/linux/wait.h

   1 #ifndef _LINUX_WAIT_H
   2 #define _LINUX_WAIT_H
   3
   4 #define WNOHANG         0x00000001
   5 #define WUNTRACED       0x00000002
   6
   7 #define __WCLONE        0x80000000
   8
   9 #ifdef __KERNEL__
  10
  11 #include <asm/page.h>
  12
  13 struct wait_queue {
  14         struct task_struct * task;
  15         struct wait_queue * next;
  16 };
  17
  18 #define WAIT_QUEUE_HEAD(x) ((struct wait_queue *)((x)-1))
  19
  20 static inline void init_waitqueue(struct wait_queue **q)
  21 {
  22         *q = WAIT_QUEUE_HEAD(q);
  23 }
  24
  25 static inline int waitqueue_active(struct wait_queue **q)
  26 {
  27         struct wait_queue *head = *q;
  28         return head && head != WAIT_QUEUE_HEAD(q);
  29 }
  30
  31 struct poll_table_entry {
  32         struct wait_queue wait;
  33         struct wait_queue ** wait_address;
  34 };
  35
  36 typedef struct poll_table_struct {
  37         unsigned int nr;
  38         struct poll_table_entry * entry;
  39 } poll_table;
  40
  41 #define __MAX_POLL_TABLE_ENTRIES (PAGE_SIZE / sizeof (struct poll_table_entry))
  42
  43 #endif /* __KERNEL__ */
  44
  45 #endif