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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 {
21 struct {
22 unsigned long arg0, arg1, arg2, arg3;
23 };
Darren Hart52400ba2009-04-03 13:40:49 -070024 /* For futex_wait and futex_wait_requeue_pi */
Steven Rostedtce6bd422007-12-05 15:46:09 +010025 struct {
Namhyung Kima3c74c52010-09-14 21:43:47 +090026 u32 __user *uaddr;
Steven Rostedtce6bd422007-12-05 15:46:09 +010027 u32 val;
28 u32 flags;
Thomas Gleixnercd689982008-02-01 17:45:14 +010029 u32 bitset;
Steven Rostedtce6bd422007-12-05 15:46:09 +010030 u64 time;
Namhyung Kima3c74c52010-09-14 21:43:47 +090031 u32 __user *uaddr2;
Steven Rostedtce6bd422007-12-05 15:46:09 +010032 } futex;
Thomas Gleixnera332d862008-02-10 09:04:12 +010033 /* 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;
Thomas Gleixnerbe5dad22008-08-31 08:19:15 -070042 /* 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;
Steven Rostedtce6bd422007-12-05 15:46:09 +010050 };
Linus Torvalds1da177e2005-04-16 15:20:36 -070051};
52
53extern 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070065static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
66{
Jeremy Fitzhardinge5548fec2008-01-30 13:30:55 +010067 set_bit(flag, (unsigned long *)&ti->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068}
69
70static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
71{
Jeremy Fitzhardinge5548fec2008-01-30 13:30:55 +010072 clear_bit(flag, (unsigned long *)&ti->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073}
74
75static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
76{
Jeremy Fitzhardinge5548fec2008-01-30 13:30:55 +010077 return test_and_set_bit(flag, (unsigned long *)&ti->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078}
79
80static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
81{
Jeremy Fitzhardinge5548fec2008-01-30 13:30:55 +010082 return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083}
84
85static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
86{
Jeremy Fitzhardinge5548fec2008-01-30 13:30:55 +010087 return test_bit(flag, (unsigned long *)&ti->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088}
89
Roman Zippel3b66a1e2005-11-13 16:06:59 -080090#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)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
Roman Zippel3b66a1e2005-11-13 16:06:59 -0800101#define set_need_resched() set_thread_flag(TIF_NEED_RESCHED)
102#define clear_need_resched() clear_thread_flag(TIF_NEED_RESCHED)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
Roland McGrathf3de2722008-04-30 00:53:09 -0700104#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
Roland McGrath4e4c22c2008-04-30 00:53:06 -0700111/**
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
Roland McGrath7648d962008-04-30 00:53:07 -0700115 * 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.
Roland McGrath4e4c22c2008-04-30 00:53:06 -0700121 */
122static inline void set_restore_sigmask(void)
123{
124 set_thread_flag(TIF_RESTORE_SIGMASK);
Roland McGrath7648d962008-04-30 00:53:07 -0700125 set_thread_flag(TIF_SIGPENDING);
Roland McGrath4e4c22c2008-04-30 00:53:06 -0700126}
Roland McGrathf3de2722008-04-30 00:53:09 -0700127#endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */
Roland McGrath4e4c22c2008-04-30 00:53:06 -0700128
129#endif /* __KERNEL__ */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
131#endif /* _LINUX_THREAD_INFO_H */