Line data Source code
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 :
12 : struct timespec;
13 : struct compat_timespec;
14 :
15 : /*
16 : * System call restart block.
17 : */
18 : struct 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 :
53 : extern long do_no_restart_syscall(struct restart_block *parm);
54 1 :
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 :
65 : static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
66 : {
67 : set_bit(flag, (unsigned long *)&ti->flags);
68 : }
69 :
70 : static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
71 : {
72 : clear_bit(flag, (unsigned long *)&ti->flags);
73 : }
74 :
75 : static 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 :
80 : static 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 :
85 : static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
86 : {
87 16 : 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 : */
122 : static 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 */
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