include/linux/thread_info.h

   1 /* thread_info.h: common low-level thread information accessors
   2  *
   3  * Copyright (C) 2002  David Howells (dhowells@redhat.com)
   4  * - Incorporating suggestions made by Linus Torvalds
   5  */
   6
   7 #ifndef _LINUX_THREAD_INFO_H
   8 #define _LINUX_THREAD_INFO_H
   9
  10 #include <linux/types.h>
  11
  12 /*
  13  * System call restart block.
  14  */
  15 struct restart_block {
  16         long (*fn)(struct restart_block *);
  17         union {
  18                 struct {
  19                         unsigned long arg0, arg1, arg2, arg3;
  20                 };
  21                 /* For futex_wait */
  22                 struct {
  23                         u32 *uaddr;
  24                         u32 val;
  25                         u32 flags;
  26                         u64 time;
  27                 } futex;
  28         };
  29 };
  30
  31 extern long do_no_restart_syscall(struct restart_block *parm);
  32
  33 #include <linux/bitops.h>
  34 #include <asm/thread_info.h>
  35
  36 #ifdef __KERNEL__
  37
  38 /*
  39  * flag set/clear/test wrappers
  40  * - pass TIF_xxxx constants to these functions
  41  */
  42
  43 static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
  44 {
  45         set_bit(flag, (unsigned long *)&ti->flags);
  46 }
  47
  48 static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
  49 {
  50         clear_bit(flag, (unsigned long *)&ti->flags);
  51 }
  52
  53 static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
  54 {
  55         return test_and_set_bit(flag, (unsigned long *)&ti->flags);
  56 }
  57
  58 static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
  59 {
  60         return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
  61 }
  62
  63 static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
  64 {
  65         return test_bit(flag, (unsigned long *)&ti->flags);
  66 }
  67
  68 #define set_thread_flag(flag) \
  69         set_ti_thread_flag(current_thread_info(), flag)
  70 #define clear_thread_flag(flag) \
  71         clear_ti_thread_flag(current_thread_info(), flag)
  72 #define test_and_set_thread_flag(flag) \
  73         test_and_set_ti_thread_flag(current_thread_info(), flag)
  74 #define test_and_clear_thread_flag(flag) \
  75         test_and_clear_ti_thread_flag(current_thread_info(), flag)
  76 #define test_thread_flag(flag) \
  77         test_ti_thread_flag(current_thread_info(), flag)
  78
  79 #define set_need_resched()      set_thread_flag(TIF_NEED_RESCHED)
  80 #define clear_need_resched()    clear_thread_flag(TIF_NEED_RESCHED)
  81
  82 #endif
  83
  84 #endif /* _LINUX_THREAD_INFO_H */