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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
10#include <linux/types.h>
11
12struct timespec;
13struct compat_timespec;
14
15/*
16 * System call restart block.
17 */
18struct restart_block {
19 long (*fn)(struct restart_block *);
20 union {
21 struct {
22 unsigned long arg0, arg1, arg2, arg3;
23 };
24 /* For futex_wait */
25 struct {
26 u32 *uaddr;
27 u32 val;
28 u32 flags;
29 u32 bitset;
30 u64 time;
31 } futex;
32 /* For nanosleep */
33 struct {
34 clockid_t index;
35 struct timespec __user *rmtp;
36#ifdef CONFIG_COMPAT
37 struct compat_timespec __user *compat_rmtp;
38#endif
39 u64 expires;
40 } nanosleep;
41 };
42};
43
44extern long do_no_restart_syscall(struct restart_block *parm);
45
46#include <linux/bitops.h>
47#include <asm/thread_info.h>
48
49#ifdef __KERNEL__
50
51/*
52 * flag set/clear/test wrappers
53 * - pass TIF_xxxx constants to these functions
54 */
55
56static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
57{
58 set_bit(flag, (unsigned long *)&ti->flags);
59}
60
61static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
62{
63 clear_bit(flag, (unsigned long *)&ti->flags);
64}
65
66static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
67{
68 return test_and_set_bit(flag, (unsigned long *)&ti->flags);
69}
70
71static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
72{
73 return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
74}
75
76static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
77{
78 return test_bit(flag, (unsigned long *)&ti->flags);
79}
80
81#define set_thread_flag(flag) \
82 set_ti_thread_flag(current_thread_info(), flag)
83#define clear_thread_flag(flag) \
84 clear_ti_thread_flag(current_thread_info(), flag)
85#define test_and_set_thread_flag(flag) \
86 test_and_set_ti_thread_flag(current_thread_info(), flag)
87#define test_and_clear_thread_flag(flag) \
88 test_and_clear_ti_thread_flag(current_thread_info(), flag)
89#define test_thread_flag(flag) \
90 test_ti_thread_flag(current_thread_info(), flag)
91
92#define set_need_resched() set_thread_flag(TIF_NEED_RESCHED)
93#define clear_need_resched() clear_thread_flag(TIF_NEED_RESCHED)
94
95#if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK
96/*
97 * An arch can define its own version of set_restore_sigmask() to get the
98 * job done however works, with or without TIF_RESTORE_SIGMASK.
99 */
100#define HAVE_SET_RESTORE_SIGMASK 1
101
102/**
103 * set_restore_sigmask() - make sure saved_sigmask processing gets done
104 *
105 * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code
106 * will run before returning to user mode, to process the flag. For
107 * all callers, TIF_SIGPENDING is already set or it's no harm to set
108 * it. TIF_RESTORE_SIGMASK need not be in the set of bits that the
109 * arch code will notice on return to user mode, in case those bits
110 * are scarce. We set TIF_SIGPENDING here to ensure that the arch
111 * signal code always gets run when TIF_RESTORE_SIGMASK is set.
112 */
113static inline void set_restore_sigmask(void)
114{
115 set_thread_flag(TIF_RESTORE_SIGMASK);
116 set_thread_flag(TIF_SIGPENDING);
117}
118#endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */
119
120#endif /* __KERNEL__ */
121
122#endif /* _LINUX_THREAD_INFO_H */