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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 /* For poll */
42 struct {
43 struct pollfd __user *ufds;
44 int nfds;
45 int has_timeout;
46 unsigned long tv_sec;
47 unsigned long tv_nsec;
48 } poll;
49 };
50};
51
52extern long do_no_restart_syscall(struct restart_block *parm);
53
54#include <linux/bitops.h>
55#include <asm/thread_info.h>
56
57#ifdef __KERNEL__
58
59/*
60 * flag set/clear/test wrappers
61 * - pass TIF_xxxx constants to these functions
62 */
63
64static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
65{
66 set_bit(flag, (unsigned long *)&ti->flags);
67}
68
69static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
70{
71 clear_bit(flag, (unsigned long *)&ti->flags);
72}
73
74static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
75{
76 return test_and_set_bit(flag, (unsigned long *)&ti->flags);
77}
78
79static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
80{
81 return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
82}
83
84static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
85{
86 return test_bit(flag, (unsigned long *)&ti->flags);
87}
88
89#define set_thread_flag(flag) \
90 set_ti_thread_flag(current_thread_info(), flag)
91#define clear_thread_flag(flag) \
92 clear_ti_thread_flag(current_thread_info(), flag)
93#define test_and_set_thread_flag(flag) \
94 test_and_set_ti_thread_flag(current_thread_info(), flag)
95#define test_and_clear_thread_flag(flag) \
96 test_and_clear_ti_thread_flag(current_thread_info(), flag)
97#define test_thread_flag(flag) \
98 test_ti_thread_flag(current_thread_info(), flag)
99
100#define set_need_resched() set_thread_flag(TIF_NEED_RESCHED)
101#define clear_need_resched() clear_thread_flag(TIF_NEED_RESCHED)
102
103#if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK
104/*
105 * An arch can define its own version of set_restore_sigmask() to get the
106 * job done however works, with or without TIF_RESTORE_SIGMASK.
107 */
108#define HAVE_SET_RESTORE_SIGMASK 1
109
110/**
111 * set_restore_sigmask() - make sure saved_sigmask processing gets done
112 *
113 * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code
114 * will run before returning to user mode, to process the flag. For
115 * all callers, TIF_SIGPENDING is already set or it's no harm to set
116 * it. TIF_RESTORE_SIGMASK need not be in the set of bits that the
117 * arch code will notice on return to user mode, in case those bits
118 * are scarce. We set TIF_SIGPENDING here to ensure that the arch
119 * signal code always gets run when TIF_RESTORE_SIGMASK is set.
120 */
121static inline void set_restore_sigmask(void)
122{
123 set_thread_flag(TIF_RESTORE_SIGMASK);
124 set_thread_flag(TIF_SIGPENDING);
125}
126#endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */
127
128#endif /* __KERNEL__ */
129
130#endif /* _LINUX_THREAD_INFO_H */