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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 and futex_wait_requeue_pi */
25 struct {
26 u32 *uaddr;
27 u32 val;
28 u32 flags;
29 u32 bitset;
30 u64 time;
31 u32 *uaddr2;
32 } futex;
33 /* 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;
42 /* 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;
50 };
51};
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
65static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
66{
67 set_bit(flag, (unsigned long *)&ti->flags);
68}
69
70static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
71{
72 clear_bit(flag, (unsigned long *)&ti->flags);
73}
74
75static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
76{
77 return test_and_set_bit(flag, (unsigned long *)&ti->flags);
78}
79
80static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
81{
82 return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
83}
84
85static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
86{
87 return test_bit(flag, (unsigned long *)&ti->flags);
88}
89
90#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)
100
101#define set_need_resched() set_thread_flag(TIF_NEED_RESCHED)
102#define clear_need_resched() clear_thread_flag(TIF_NEED_RESCHED)
103
104#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
111/**
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
115 * 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.
121 */
122static inline void set_restore_sigmask(void)
123{
124 set_thread_flag(TIF_RESTORE_SIGMASK);
125 set_thread_flag(TIF_SIGPENDING);
126}
127#endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */
128
129#endif /* __KERNEL__ */
130
131#endif /* _LINUX_THREAD_INFO_H */