[deliverable/linux.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 {
		/* 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 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	20	union {
52400ba9	21	/* For futex_wait and futex_wait_requeue_pi */
ce6bd420	22	struct {
a3c74c52	23	u32 __user *uaddr;
ce6bd420 SR	24	u32 val;
ce6bd420 SR	25	u32 flags;
cd689985	26	u32 bitset;
ce6bd420	27	u64 time;
a3c74c52	28	u32 __user *uaddr2;
ce6bd420	29	} futex;
a332d86d TG	30	/* For nanosleep */
a332d86d TG	31	struct {
ab8177bc	32	clockid_t clockid;
a332d86d TG	33	struct timespec __user *rmtp;
	34	#ifdef CONFIG_COMPAT
	35	struct compat_timespec __user *compat_rmtp;
	36	#endif
	37	u64 expires;
	38	} nanosleep;
be5dad20 TG	39	/* For poll */
	40	struct {
	41	struct pollfd __user *ufds;
	42	int nfds;
	43	int has_timeout;
	44	unsigned long tv_sec;
	45	unsigned long tv_nsec;
	46	} poll;
ce6bd420	47	};
1da177e4 LT	48	};
	49
	50	extern long do_no_restart_syscall(struct restart_block *parm);
	51
	52	#include <linux/bitops.h>
	53	#include <asm/thread_info.h>
	54
	55	#ifdef __KERNEL__
	56
2889f608 TG	57	#ifdef CONFIG_DEBUG_STACK_USAGE
	58	# define THREADINFO_GFP (GFP_KERNEL \| __GFP_NOTRACK \| __GFP_ZERO)
	59	#else
	60	# define THREADINFO_GFP (GFP_KERNEL \| __GFP_NOTRACK)
	61	#endif
	62
1da177e4 LT	63	/*
	64	* flag set/clear/test wrappers
	65	* - pass TIF_xxxx constants to these functions
	66	*/
	67
1da177e4 LT	68	static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
1da177e4 LT	69	{
5548fecd	70	set_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	71	}
	72
	73	static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
	74	{
5548fecd	75	clear_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	76	}
	77
	78	static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
	79	{
5548fecd	80	return test_and_set_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	81	}
	82
	83	static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
	84	{
5548fecd	85	return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	86	}
	87
	88	static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
	89	{
5548fecd	90	return test_bit(flag, (unsigned long *)&ti->flags);
1da177e4 LT	91	}
1da177e4 LT	92
3b66a1ed RZ	93	#define set_thread_flag(flag) \
	94	set_ti_thread_flag(current_thread_info(), flag)
	95	#define clear_thread_flag(flag) \
	96	clear_ti_thread_flag(current_thread_info(), flag)
	97	#define test_and_set_thread_flag(flag) \
	98	test_and_set_ti_thread_flag(current_thread_info(), flag)
	99	#define test_and_clear_thread_flag(flag) \
	100	test_and_clear_ti_thread_flag(current_thread_info(), flag)
	101	#define test_thread_flag(flag) \
	102	test_ti_thread_flag(current_thread_info(), flag)
	103
	104	#define set_need_resched() set_thread_flag(TIF_NEED_RESCHED)
	105	#define clear_need_resched() clear_thread_flag(TIF_NEED_RESCHED)
1da177e4	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);
7648d961	128	set_thread_flag(TIF_SIGPENDING);
4e4c22c7	129	}
f3de272b	130	#endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */
4e4c22c7 RM	131
4e4c22c7 RM	132	#endif /* __KERNEL__ */
1da177e4 LT	133
1da177e4 LT	134	#endif /* _LINUX_THREAD_INFO_H */