[linux-2.6-block.git] / include / linux / thread_info.h

/* 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 {
		struct {
			unsigned long arg0, arg1, arg2, arg3;
		};
		/* For futex_wait */
		struct {
			u32 *uaddr;
			u32 val;
			u32 flags;
			u32 bitset;
			u64 time;
		} futex;
		/* For nanosleep */
		struct {
			clockid_t index;
			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 */
Commit	Line	Data
1da177e4 LT	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
ce6bd420 SR	10	#include <linux/types.h>
ce6bd420 SR	11
a332d86d TG	12	struct timespec;
	13	struct compat_timespec;
	14
1da177e4	15	/*
ce6bd420	16	* System call restart block.
1da177e4 LT	17	*/
	18	struct restart_block {
	19	long (fn)(struct restart_block );
ce6bd420 SR	20	union {
	21	struct {
	22	unsigned long arg0, arg1, arg2, arg3;
	23	};
	24	/* For futex_wait */
	25	struct {
	26	u32 *uaddr;
	27	u32 val;
	28	u32 flags;
cd689985	29	u32 bitset;
ce6bd420 SR	30	u64 time;
ce6bd420 SR	31	} futex;
a332d86d TG	32	/* For nanosleep */
	33	struct {
	34	clockid_t index;
	35	struct timespec __user *rmtp;
	36	#ifdef CONFIG_COMPAT
	37	struct compat_timespec __user *compat_rmtp;
	38	#endif
	39	u64 expires;
	40	} nanosleep;
be5dad20 TG	41	/* For poll */
	42	struct {
	43	struct pollfd __user *ufds;
	44	int nfds;
	45	int has_timeout;
	46	unsigned long tv_sec;
	47	unsigned long tv_nsec;
	48	} poll;
ce6bd420	49	};
1da177e4 LT	50	};
	51
	52	extern long do_no_restart_syscall(struct restart_block *parm);
	53
	54	#include <linux/bitops.h>
	55	#include <asm/thread_info.h>
	56
	57	#ifdef __KERNEL__
	58
	59	/*
	60	* flag set/clear/test wrappers
	61	* - pass TIF_xxxx constants to these functions
	62	*/
	63
1da177e4 LT	64	static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
1da177e4 LT	65	{
5548fecd	66	set_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	67	}
	68
	69	static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
	70	{
5548fecd	71	clear_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	72	}
	73
	74	static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
	75	{
5548fecd	76	return test_and_set_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	77	}
	78
	79	static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
	80	{
5548fecd	81	return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	82	}
	83
	84	static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
	85	{
5548fecd	86	return test_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	87	}
1da177e4 LT	88
3b66a1ed RZ	89	#define set_thread_flag(flag) \
	90	set_ti_thread_flag(current_thread_info(), flag)
	91	#define clear_thread_flag(flag) \
	92	clear_ti_thread_flag(current_thread_info(), flag)
	93	#define test_and_set_thread_flag(flag) \
	94	test_and_set_ti_thread_flag(current_thread_info(), flag)
	95	#define test_and_clear_thread_flag(flag) \
	96	test_and_clear_ti_thread_flag(current_thread_info(), flag)
	97	#define test_thread_flag(flag) \
	98	test_ti_thread_flag(current_thread_info(), flag)
	99
	100	#define set_need_resched() set_thread_flag(TIF_NEED_RESCHED)
	101	#define clear_need_resched() clear_thread_flag(TIF_NEED_RESCHED)
1da177e4	102
f3de272b RM	103	#if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK
	104	/*
	105	* An arch can define its own version of set_restore_sigmask() to get the
	106	* job done however works, with or without TIF_RESTORE_SIGMASK.
	107	*/
	108	#define HAVE_SET_RESTORE_SIGMASK 1
	109
4e4c22c7 RM	110	/**
	111	* set_restore_sigmask() - make sure saved_sigmask processing gets done
	112	*
	113	* This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code
7648d961 RM	114	* will run before returning to user mode, to process the flag. For
	115	* all callers, TIF_SIGPENDING is already set or it's no harm to set
	116	* it. TIF_RESTORE_SIGMASK need not be in the set of bits that the
	117	* arch code will notice on return to user mode, in case those bits
	118	* are scarce. We set TIF_SIGPENDING here to ensure that the arch
	119	* signal code always gets run when TIF_RESTORE_SIGMASK is set.
4e4c22c7 RM	120	*/
	121	static inline void set_restore_sigmask(void)
	122	{
	123	set_thread_flag(TIF_RESTORE_SIGMASK);
7648d961	124	set_thread_flag(TIF_SIGPENDING);
4e4c22c7	125	}
f3de272b	126	#endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */
4e4c22c7 RM	127
4e4c22c7 RM	128	#endif /* __KERNEL__ */
1da177e4 LT	129
1da177e4 LT	130	#endif /* _LINUX_THREAD_INFO_H */