[net-next-2.6.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 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 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	};
52400ba9	24	/* For futex_wait and futex_wait_requeue_pi */
ce6bd420	25	struct {
a3c74c52	26	u32 __user *uaddr;
ce6bd420 SR	27	u32 val;
ce6bd420 SR	28	u32 flags;
cd689985	29	u32 bitset;
ce6bd420	30	u64 time;
a3c74c52	31	u32 __user *uaddr2;
ce6bd420	32	} futex;
a332d86d TG	33	/* For nanosleep */
	34	struct {
	35	clockid_t index;
	36	struct timespec __user *rmtp;
	37	#ifdef CONFIG_COMPAT
	38	struct compat_timespec __user *compat_rmtp;
	39	#endif
	40	u64 expires;
	41	} nanosleep;
be5dad20 TG	42	/* For poll */
	43	struct {
	44	struct pollfd __user *ufds;
	45	int nfds;
	46	int has_timeout;
	47	unsigned long tv_sec;
	48	unsigned long tv_nsec;
	49	} poll;
ce6bd420	50	};
1da177e4 LT	51	};
	52
	53	extern long do_no_restart_syscall(struct restart_block *parm);
	54
	55	#include <linux/bitops.h>
	56	#include <asm/thread_info.h>
	57
	58	#ifdef __KERNEL__
	59
	60	/*
	61	* flag set/clear/test wrappers
	62	* - pass TIF_xxxx constants to these functions
	63	*/
	64
1da177e4 LT	65	static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
1da177e4 LT	66	{
5548fecd	67	set_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	68	}
	69
	70	static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
	71	{
5548fecd	72	clear_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	73	}
	74
	75	static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
	76	{
5548fecd	77	return test_and_set_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	78	}
	79
	80	static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
	81	{
5548fecd	82	return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	83	}
	84
	85	static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
	86	{
5548fecd	87	return test_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	88	}
1da177e4 LT	89
3b66a1ed RZ	90	#define set_thread_flag(flag) \
	91	set_ti_thread_flag(current_thread_info(), flag)
	92	#define clear_thread_flag(flag) \
	93	clear_ti_thread_flag(current_thread_info(), flag)
	94	#define test_and_set_thread_flag(flag) \
	95	test_and_set_ti_thread_flag(current_thread_info(), flag)
	96	#define test_and_clear_thread_flag(flag) \
	97	test_and_clear_ti_thread_flag(current_thread_info(), flag)
	98	#define test_thread_flag(flag) \
	99	test_ti_thread_flag(current_thread_info(), flag)
	100
	101	#define set_need_resched() set_thread_flag(TIF_NEED_RESCHED)
	102	#define clear_need_resched() clear_thread_flag(TIF_NEED_RESCHED)
1da177e4	103
f3de272b RM	104	#if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK
	105	/*
	106	* An arch can define its own version of set_restore_sigmask() to get the
	107	* job done however works, with or without TIF_RESTORE_SIGMASK.
	108	*/
	109	#define HAVE_SET_RESTORE_SIGMASK 1
	110
4e4c22c7 RM	111	/**
	112	* set_restore_sigmask() - make sure saved_sigmask processing gets done
	113	*
	114	* This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code
7648d961 RM	115	* will run before returning to user mode, to process the flag. For
	116	* all callers, TIF_SIGPENDING is already set or it's no harm to set
	117	* it. TIF_RESTORE_SIGMASK need not be in the set of bits that the
	118	* arch code will notice on return to user mode, in case those bits
	119	* are scarce. We set TIF_SIGPENDING here to ensure that the arch
	120	* signal code always gets run when TIF_RESTORE_SIGMASK is set.
4e4c22c7 RM	121	*/
	122	static inline void set_restore_sigmask(void)
	123	{
	124	set_thread_flag(TIF_RESTORE_SIGMASK);
7648d961	125	set_thread_flag(TIF_SIGPENDING);
4e4c22c7	126	}
f3de272b	127	#endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */
4e4c22c7 RM	128
4e4c22c7 RM	129	#endif /* __KERNEL__ */
1da177e4 LT	130
1da177e4 LT	131	#endif /* _LINUX_THREAD_INFO_H */