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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 /* For futex_wait and futex_wait_requeue_pi */
22 struct {
23 u32 __user *uaddr;
24 u32 val;
25 u32 flags;
26 u32 bitset;
27 u64 time;
28 u32 __user *uaddr2;
29 } futex;
30 /* For nanosleep */
31 struct {
32 clockid_t clockid;
33 struct timespec __user *rmtp;
34#ifdef CONFIG_COMPAT
35 struct compat_timespec __user *compat_rmtp;
36#endif
37 u64 expires;
38 } nanosleep;
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;
47 };
48};
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
62static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
63{
64 set_bit(flag, (unsigned long *)&ti->flags);
65}
66
67static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
68{
69 clear_bit(flag, (unsigned long *)&ti->flags);
70}
71
72static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
73{
74 return test_and_set_bit(flag, (unsigned long *)&ti->flags);
75}
76
77static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
78{
79 return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
80}
81
82static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
83{
84 return test_bit(flag, (unsigned long *)&ti->flags);
85}
86
87#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)
97
98#define set_need_resched() set_thread_flag(TIF_NEED_RESCHED)
99#define clear_need_resched() clear_thread_flag(TIF_NEED_RESCHED)
100
101#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
108/**
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
112 * 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.
118 */
119static inline void set_restore_sigmask(void)
120{
121 set_thread_flag(TIF_RESTORE_SIGMASK);
122 set_thread_flag(TIF_SIGPENDING);
123}
124#endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */
125
126#endif /* __KERNEL__ */
127
128#endif /* _LINUX_THREAD_INFO_H */