[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>
#include <linux/bug.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__

#ifdef CONFIG_DEBUG_STACK_USAGE
# define THREADINFO_GFP		(GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO)
#else
# define THREADINFO_GFP		(GFP_KERNEL | __GFP_NOTRACK)
#endif

/*
 * 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 tif_need_resched() test_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);
	WARN_ON(!test_thread_flag(TIF_SIGPENDING));
}
static inline void clear_restore_sigmask(void)
{
	clear_thread_flag(TIF_RESTORE_SIGMASK);
}
static inline bool test_restore_sigmask(void)
{
	return test_thread_flag(TIF_RESTORE_SIGMASK);
}
static inline bool test_and_clear_restore_sigmask(void)
{
	return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK);
}
#endif	/* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */

#ifndef HAVE_SET_RESTORE_SIGMASK
#error "no set_restore_sigmask() provided and default one won't work"
#endif

#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	10	#include <linux/types.h>
edd63a27	11	#include <linux/bug.h>
ce6bd420	12
a332d86d TG	13	struct timespec;
	14	struct compat_timespec;
	15
1da177e4	16	/*
ce6bd420	17	* System call restart block.
1da177e4 LT	18	*/
	19	struct restart_block {
	20	long (fn)(struct restart_block );
ce6bd420	21	union {
52400ba9	22	/* For futex_wait and futex_wait_requeue_pi */
ce6bd420	23	struct {
a3c74c52	24	u32 __user *uaddr;
ce6bd420 SR	25	u32 val;
ce6bd420 SR	26	u32 flags;
cd689985	27	u32 bitset;
ce6bd420	28	u64 time;
a3c74c52	29	u32 __user *uaddr2;
ce6bd420	30	} futex;
a332d86d TG	31	/* For nanosleep */
a332d86d TG	32	struct {
ab8177bc	33	clockid_t clockid;
a332d86d TG	34	struct timespec __user *rmtp;
	35	#ifdef CONFIG_COMPAT
	36	struct compat_timespec __user *compat_rmtp;
	37	#endif
	38	u64 expires;
	39	} nanosleep;
be5dad20 TG	40	/* For poll */
	41	struct {
	42	struct pollfd __user *ufds;
	43	int nfds;
	44	int has_timeout;
	45	unsigned long tv_sec;
	46	unsigned long tv_nsec;
	47	} poll;
ce6bd420	48	};
1da177e4 LT	49	};
	50
	51	extern long do_no_restart_syscall(struct restart_block *parm);
	52
	53	#include <linux/bitops.h>
	54	#include <asm/thread_info.h>
	55
	56	#ifdef __KERNEL__
	57
2889f608 TG	58	#ifdef CONFIG_DEBUG_STACK_USAGE
	59	# define THREADINFO_GFP (GFP_KERNEL \| __GFP_NOTRACK \| __GFP_ZERO)
	60	#else
	61	# define THREADINFO_GFP (GFP_KERNEL \| __GFP_NOTRACK)
	62	#endif
	63
1da177e4 LT	64	/*
	65	* flag set/clear/test wrappers
	66	* - pass TIF_xxxx constants to these functions
	67	*/
	68
1da177e4 LT	69	static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
1da177e4 LT	70	{
5548fecd	71	set_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	72	}
	73
	74	static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
	75	{
5548fecd	76	clear_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	77	}
	78
	79	static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
	80	{
5548fecd	81	return test_and_set_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	82	}
	83
	84	static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
	85	{
5548fecd	86	return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	87	}
	88
	89	static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
	90	{
5548fecd	91	return test_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	92	}
1da177e4 LT	93
3b66a1ed RZ	94	#define set_thread_flag(flag) \
	95	set_ti_thread_flag(current_thread_info(), flag)
	96	#define clear_thread_flag(flag) \
	97	clear_ti_thread_flag(current_thread_info(), flag)
	98	#define test_and_set_thread_flag(flag) \
	99	test_and_set_ti_thread_flag(current_thread_info(), flag)
	100	#define test_and_clear_thread_flag(flag) \
	101	test_and_clear_ti_thread_flag(current_thread_info(), flag)
	102	#define test_thread_flag(flag) \
	103	test_ti_thread_flag(current_thread_info(), flag)
	104
ea811747 PZ	105	#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
ea811747 PZ	106
f3de272b RM	107	#if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK
	108	/*
	109	* An arch can define its own version of set_restore_sigmask() to get the
	110	* job done however works, with or without TIF_RESTORE_SIGMASK.
	111	*/
	112	#define HAVE_SET_RESTORE_SIGMASK 1
	113
4e4c22c7 RM	114	/**
	115	* set_restore_sigmask() - make sure saved_sigmask processing gets done
	116	*
	117	* This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code
7648d961 RM	118	* will run before returning to user mode, to process the flag. For
	119	* all callers, TIF_SIGPENDING is already set or it's no harm to set
	120	* it. TIF_RESTORE_SIGMASK need not be in the set of bits that the
	121	* arch code will notice on return to user mode, in case those bits
	122	* are scarce. We set TIF_SIGPENDING here to ensure that the arch
	123	* signal code always gets run when TIF_RESTORE_SIGMASK is set.
4e4c22c7 RM	124	*/
	125	static inline void set_restore_sigmask(void)
	126	{
	127	set_thread_flag(TIF_RESTORE_SIGMASK);
edd63a27	128	WARN_ON(!test_thread_flag(TIF_SIGPENDING));
4e4c22c7	129	}
4ebefe3e AV	130	static inline void clear_restore_sigmask(void)
	131	{
	132	clear_thread_flag(TIF_RESTORE_SIGMASK);
	133	}
	134	static inline bool test_restore_sigmask(void)
	135	{
	136	return test_thread_flag(TIF_RESTORE_SIGMASK);
	137	}
	138	static inline bool test_and_clear_restore_sigmask(void)
	139	{
	140	return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK);
	141	}
f3de272b	142	#endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */
4e4c22c7	143
754421c8 AV	144	#ifndef HAVE_SET_RESTORE_SIGMASK
	145	#error "no set_restore_sigmask() provided and default one won't work"
	146	#endif
	147
4e4c22c7	148	#endif /* __KERNEL__ */
1da177e4 LT	149
1da177e4 LT	150	#endif /* _LINUX_THREAD_INFO_H */