/* thread_info.h: common low-level thread information accessors
   *
   * Copyright (C) 2002  David Howells (dhowells@redhat.com)
   * - Incorporating suggestions made by Linus Torvalds
   */
  
  #ifndef _LINUX_THREAD_INFO_H
  #define _LINUX_THREAD_INFO_H

  #include <linux/types.h>

  struct timespec;
  struct compat_timespec;

  /*

   * System call restart block.

   */
  struct restart_block {
  	long (*fn)(struct restart_block *);

  	union {

  		/* For futex_wait and futex_wait_requeue_pi */

  		struct {

  			u32 __user *uaddr;

  			u32 val;
  			u32 flags;

  			u32 bitset;

  			u64 time;

  			u32 __user *uaddr2;

  		} futex;

  		/* For nanosleep */
  		struct {

  			clockid_t clockid;

  			struct timespec __user *rmtp;
  #ifdef CONFIG_COMPAT
  			struct compat_timespec __user *compat_rmtp;
  #endif
  			u64 expires;
  		} nanosleep;

  		/* For poll */
  		struct {
  			struct pollfd __user *ufds;
  			int nfds;
  			int has_timeout;
  			unsigned long tv_sec;
  			unsigned long tv_nsec;
  		} poll;

  	};

  };
  
  extern long do_no_restart_syscall(struct restart_block *parm);
  
  #include <linux/bitops.h>
  #include <asm/thread_info.h>
  
  #ifdef __KERNEL__
  
  /*
   * flag set/clear/test wrappers
   * - pass TIF_xxxx constants to these functions
   */

  static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
  {

  	set_bit(flag, (unsigned long *)&ti->flags);

  }
  
  static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
  {

  	clear_bit(flag, (unsigned long *)&ti->flags);

  }
  
  static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
  {

  	return test_and_set_bit(flag, (unsigned long *)&ti->flags);

  }
  
  static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
  {

  	return test_and_clear_bit(flag, (unsigned long *)&ti->flags);

  }
  
  static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
  {

  	return test_bit(flag, (unsigned long *)&ti->flags);

  }

  #define set_thread_flag(flag) \
  	set_ti_thread_flag(current_thread_info(), flag)
  #define clear_thread_flag(flag) \
  	clear_ti_thread_flag(current_thread_info(), flag)
  #define test_and_set_thread_flag(flag) \
  	test_and_set_ti_thread_flag(current_thread_info(), flag)
  #define test_and_clear_thread_flag(flag) \
  	test_and_clear_ti_thread_flag(current_thread_info(), flag)
  #define test_thread_flag(flag) \
  	test_ti_thread_flag(current_thread_info(), flag)
  
  #define set_need_resched()	set_thread_flag(TIF_NEED_RESCHED)
  #define clear_need_resched()	clear_thread_flag(TIF_NEED_RESCHED)

  #if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK
  /*
   * An arch can define its own version of set_restore_sigmask() to get the
   * job done however works, with or without TIF_RESTORE_SIGMASK.
   */
  #define HAVE_SET_RESTORE_SIGMASK	1

  /**
   * set_restore_sigmask() - make sure saved_sigmask processing gets done
   *
   * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code

   * will run before returning to user mode, to process the flag.  For
   * all callers, TIF_SIGPENDING is already set or it's no harm to set
   * it.  TIF_RESTORE_SIGMASK need not be in the set of bits that the
   * arch code will notice on return to user mode, in case those bits
   * are scarce.  We set TIF_SIGPENDING here to ensure that the arch
   * signal code always gets run when TIF_RESTORE_SIGMASK is set.

   */
  static inline void set_restore_sigmask(void)
  {
  	set_thread_flag(TIF_RESTORE_SIGMASK);

  	set_thread_flag(TIF_SIGPENDING);

  }

  #endif	/* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */

  
  #endif	/* __KERNEL__ */

  
  #endif /* _LINUX_THREAD_INFO_H */