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 : #include <linux/bug.h>
12 :
13 : struct timespec;
14 : struct compat_timespec;
15 :
16 : /*
17 : * System call restart block.
18 : */
19 : struct restart_block {
20 : long (*fn)(struct restart_block *);
21 : union {
22 : /* For futex_wait and futex_wait_requeue_pi */
23 : struct {
24 : u32 __user *uaddr;
25 : u32 val;
26 : u32 flags;
27 : u32 bitset;
28 : u64 time;
29 : u32 __user *uaddr2;
30 : } futex;
31 : /* For nanosleep */
32 : struct {
33 : clockid_t clockid;
34 : struct timespec __user *rmtp;
35 : #ifdef CONFIG_COMPAT
36 : struct compat_timespec __user *compat_rmtp;
37 : #endif
38 : u64 expires;
39 : } nanosleep;
40 : /* For poll */
41 : struct {
42 : struct pollfd __user *ufds;
43 : int nfds;
44 : int has_timeout;
45 : unsigned long tv_sec;
46 : unsigned long tv_nsec;
47 : } poll;
48 : };
49 : };
50 :
51 : extern long do_no_restart_syscall(struct restart_block *parm);
52 :
53 : #include <linux/bitops.h>
54 : #include <asm/thread_info.h>
55 :
56 : #ifdef __KERNEL__
57 :
58 : #ifdef CONFIG_DEBUG_STACK_USAGE
59 : # define THREADINFO_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO)
60 : #else
61 : # define THREADINFO_GFP (GFP_KERNEL | __GFP_NOTRACK)
62 : #endif
63 :
64 : /*
65 : * flag set/clear/test wrappers
66 : * - pass TIF_xxxx constants to these functions
67 : */
68 :
69 : static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
70 : {
71 : set_bit(flag, (unsigned long *)&ti->flags);
72 : }
73 :
74 : static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
75 : {
76 : clear_bit(flag, (unsigned long *)&ti->flags);
77 : }
78 :
79 : static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
80 : {
81 : return test_and_set_bit(flag, (unsigned long *)&ti->flags);
82 : }
83 :
84 : static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
85 : {
86 : return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
87 : }
88 :
89 248947 : static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
90 : {
91 497894 : return test_bit(flag, (unsigned long *)&ti->flags);
92 : }
93 :
94 : #define set_thread_flag(flag) \
95 : set_ti_thread_flag(current_thread_info(), flag)
96 : #define clear_thread_flag(flag) \
97 : clear_ti_thread_flag(current_thread_info(), flag)
98 : #define test_and_set_thread_flag(flag) \
99 : test_and_set_ti_thread_flag(current_thread_info(), flag)
100 : #define test_and_clear_thread_flag(flag) \
101 : test_and_clear_ti_thread_flag(current_thread_info(), flag)
102 : #define test_thread_flag(flag) \
103 : test_ti_thread_flag(current_thread_info(), flag)
104 :
105 : #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
106 :
107 : #if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK
108 : /*
109 : * An arch can define its own version of set_restore_sigmask() to get the
110 : * job done however works, with or without TIF_RESTORE_SIGMASK.
111 : */
112 : #define HAVE_SET_RESTORE_SIGMASK 1
113 :
114 : /**
115 : * set_restore_sigmask() - make sure saved_sigmask processing gets done
116 : *
117 : * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code
118 : * will run before returning to user mode, to process the flag. For
119 : * all callers, TIF_SIGPENDING is already set or it's no harm to set
120 : * it. TIF_RESTORE_SIGMASK need not be in the set of bits that the
121 : * arch code will notice on return to user mode, in case those bits
122 : * are scarce. We set TIF_SIGPENDING here to ensure that the arch
123 : * signal code always gets run when TIF_RESTORE_SIGMASK is set.
124 : */
125 : static inline void set_restore_sigmask(void)
126 : {
127 : set_thread_flag(TIF_RESTORE_SIGMASK);
128 : WARN_ON(!test_thread_flag(TIF_SIGPENDING));
129 : }
130 : static inline void clear_restore_sigmask(void)
131 : {
132 : clear_thread_flag(TIF_RESTORE_SIGMASK);
133 : }
134 : static inline bool test_restore_sigmask(void)
135 : {
136 : return test_thread_flag(TIF_RESTORE_SIGMASK);
137 : }
138 : static inline bool test_and_clear_restore_sigmask(void)
139 : {
140 : return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK);
141 : }
142 : #endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */
143 :
144 : #ifndef HAVE_SET_RESTORE_SIGMASK
145 : #error "no set_restore_sigmask() provided and default one won't work"
146 : #endif
147 :
148 : #endif /* __KERNEL__ */
149 :
150 : #endif /* _LINUX_THREAD_INFO_H */
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