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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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
Steven Rostedtce6bd422007-12-05 15:46:09 +010010#include <linux/types.h>
11
Thomas Gleixnera332d862008-02-10 09:04:12 +010012struct timespec;
13struct compat_timespec;
14
Linus Torvalds1da177e2005-04-16 15:20:36 -070015/*
Steven Rostedtce6bd422007-12-05 15:46:09 +010016 * System call restart block.
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
18struct restart_block {
19 long (*fn)(struct restart_block *);
Steven Rostedtce6bd422007-12-05 15:46:09 +010020 union {
Darren Hart52400ba2009-04-03 13:40:49 -070021 /* For futex_wait and futex_wait_requeue_pi */
Steven Rostedtce6bd422007-12-05 15:46:09 +010022 struct {
Namhyung Kima3c74c52010-09-14 21:43:47 +090023 u32 __user *uaddr;
Steven Rostedtce6bd422007-12-05 15:46:09 +010024 u32 val;
25 u32 flags;
Thomas Gleixnercd689982008-02-01 17:45:14 +010026 u32 bitset;
Steven Rostedtce6bd422007-12-05 15:46:09 +010027 u64 time;
Namhyung Kima3c74c52010-09-14 21:43:47 +090028 u32 __user *uaddr2;
Steven Rostedtce6bd422007-12-05 15:46:09 +010029 } futex;
Thomas Gleixnera332d862008-02-10 09:04:12 +010030 /* For nanosleep */
31 struct {
32 clockid_t index;
33 struct timespec __user *rmtp;
34#ifdef CONFIG_COMPAT
35 struct compat_timespec __user *compat_rmtp;
36#endif
37 u64 expires;
38 } nanosleep;
Thomas Gleixnerbe5dad22008-08-31 08:19:15 -070039 /* 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;
Steven Rostedtce6bd422007-12-05 15:46:09 +010047 };
Linus Torvalds1da177e2005-04-16 15:20:36 -070048};
49
50extern 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
57/*
58 * flag set/clear/test wrappers
59 * - pass TIF_xxxx constants to these functions
60 */
61
Linus Torvalds1da177e2005-04-16 15:20:36 -070062static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
63{
Jeremy Fitzhardinge5548fec2008-01-30 13:30:55 +010064 set_bit(flag, (unsigned long *)&ti->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065}
66
67static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
68{
Jeremy Fitzhardinge5548fec2008-01-30 13:30:55 +010069 clear_bit(flag, (unsigned long *)&ti->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070070}
71
72static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
73{
Jeremy Fitzhardinge5548fec2008-01-30 13:30:55 +010074 return test_and_set_bit(flag, (unsigned long *)&ti->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075}
76
77static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
78{
Jeremy Fitzhardinge5548fec2008-01-30 13:30:55 +010079 return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080}
81
82static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
83{
Jeremy Fitzhardinge5548fec2008-01-30 13:30:55 +010084 return test_bit(flag, (unsigned long *)&ti->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085}
86
Roman Zippel3b66a1e2005-11-13 16:06:59 -080087#define set_thread_flag(flag) \
88 set_ti_thread_flag(current_thread_info(), flag)
89#define clear_thread_flag(flag) \
90 clear_ti_thread_flag(current_thread_info(), flag)
91#define test_and_set_thread_flag(flag) \
92 test_and_set_ti_thread_flag(current_thread_info(), flag)
93#define test_and_clear_thread_flag(flag) \
94 test_and_clear_ti_thread_flag(current_thread_info(), flag)
95#define test_thread_flag(flag) \
96 test_ti_thread_flag(current_thread_info(), flag)
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Roman Zippel3b66a1e2005-11-13 16:06:59 -080098#define set_need_resched() set_thread_flag(TIF_NEED_RESCHED)
99#define clear_need_resched() clear_thread_flag(TIF_NEED_RESCHED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
Roland McGrathf3de2722008-04-30 00:53:09 -0700101#if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK
102/*
103 * An arch can define its own version of set_restore_sigmask() to get the
104 * job done however works, with or without TIF_RESTORE_SIGMASK.
105 */
106#define HAVE_SET_RESTORE_SIGMASK 1
107
Roland McGrath4e4c22c2008-04-30 00:53:06 -0700108/**
109 * set_restore_sigmask() - make sure saved_sigmask processing gets done
110 *
111 * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code
Roland McGrath7648d962008-04-30 00:53:07 -0700112 * will run before returning to user mode, to process the flag. For
113 * all callers, TIF_SIGPENDING is already set or it's no harm to set
114 * it. TIF_RESTORE_SIGMASK need not be in the set of bits that the
115 * arch code will notice on return to user mode, in case those bits
116 * are scarce. We set TIF_SIGPENDING here to ensure that the arch
117 * signal code always gets run when TIF_RESTORE_SIGMASK is set.
Roland McGrath4e4c22c2008-04-30 00:53:06 -0700118 */
119static inline void set_restore_sigmask(void)
120{
121 set_thread_flag(TIF_RESTORE_SIGMASK);
Roland McGrath7648d962008-04-30 00:53:07 -0700122 set_thread_flag(TIF_SIGPENDING);
Roland McGrath4e4c22c2008-04-30 00:53:06 -0700123}
Roland McGrathf3de2722008-04-30 00:53:09 -0700124#endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */
Roland McGrath4e4c22c2008-04-30 00:53:06 -0700125
126#endif /* __KERNEL__ */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
128#endif /* _LINUX_THREAD_INFO_H */