Kernel  |  3.3

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/* thread_info.h: common low-level thread information accessors
 * Copyright (C) 2002  David Howells (
 * - Incorporating suggestions made by Linus Torvalds


#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;
			struct compat_timespec __user *compat_rmtp;
			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)

 * An arch can define its own version of set_restore_sigmask() to get the
 * job done however works, with or without TIF_RESTORE_SIGMASK.

 * 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)

#endif	/* __KERNEL__ */

#endif /* _LINUX_THREAD_INFO_H */