Commit | Line | Data |
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1da177e4 LT |
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 | ||
ce6bd420 | 10 | #include <linux/types.h> |
edd63a27 | 11 | #include <linux/bug.h> |
ce6bd420 | 12 | |
a332d86d TG |
13 | struct timespec; |
14 | struct compat_timespec; | |
15 | ||
1da177e4 | 16 | /* |
ce6bd420 | 17 | * System call restart block. |
1da177e4 LT |
18 | */ |
19 | struct restart_block { | |
20 | long (*fn)(struct restart_block *); | |
ce6bd420 | 21 | union { |
52400ba9 | 22 | /* For futex_wait and futex_wait_requeue_pi */ |
ce6bd420 | 23 | struct { |
a3c74c52 | 24 | u32 __user *uaddr; |
ce6bd420 SR |
25 | u32 val; |
26 | u32 flags; | |
cd689985 | 27 | u32 bitset; |
ce6bd420 | 28 | u64 time; |
a3c74c52 | 29 | u32 __user *uaddr2; |
ce6bd420 | 30 | } futex; |
a332d86d TG |
31 | /* For nanosleep */ |
32 | struct { | |
ab8177bc | 33 | clockid_t clockid; |
a332d86d TG |
34 | struct timespec __user *rmtp; |
35 | #ifdef CONFIG_COMPAT | |
36 | struct compat_timespec __user *compat_rmtp; | |
37 | #endif | |
38 | u64 expires; | |
39 | } nanosleep; | |
be5dad20 TG |
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; | |
ce6bd420 | 48 | }; |
1da177e4 LT |
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 | ||
2889f608 | 58 | #ifdef CONFIG_DEBUG_STACK_USAGE |
5d097056 VD |
59 | # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | \ |
60 | __GFP_ZERO) | |
2889f608 | 61 | #else |
5d097056 | 62 | # define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK) |
2889f608 TG |
63 | #endif |
64 | ||
1da177e4 LT |
65 | /* |
66 | * flag set/clear/test wrappers | |
67 | * - pass TIF_xxxx constants to these functions | |
68 | */ | |
69 | ||
1da177e4 LT |
70 | static inline void set_ti_thread_flag(struct thread_info *ti, int flag) |
71 | { | |
5548fecd | 72 | set_bit(flag, (unsigned long *)&ti->flags); |
1da177e4 LT |
73 | } |
74 | ||
75 | static inline void clear_ti_thread_flag(struct thread_info *ti, int flag) | |
76 | { | |
5548fecd | 77 | clear_bit(flag, (unsigned long *)&ti->flags); |
1da177e4 LT |
78 | } |
79 | ||
80 | static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag) | |
81 | { | |
5548fecd | 82 | return test_and_set_bit(flag, (unsigned long *)&ti->flags); |
1da177e4 LT |
83 | } |
84 | ||
85 | static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag) | |
86 | { | |
5548fecd | 87 | return test_and_clear_bit(flag, (unsigned long *)&ti->flags); |
1da177e4 LT |
88 | } |
89 | ||
90 | static inline int test_ti_thread_flag(struct thread_info *ti, int flag) | |
91 | { | |
5548fecd | 92 | return test_bit(flag, (unsigned long *)&ti->flags); |
1da177e4 LT |
93 | } |
94 | ||
3b66a1ed RZ |
95 | #define set_thread_flag(flag) \ |
96 | set_ti_thread_flag(current_thread_info(), flag) | |
97 | #define clear_thread_flag(flag) \ | |
98 | clear_ti_thread_flag(current_thread_info(), flag) | |
99 | #define test_and_set_thread_flag(flag) \ | |
100 | test_and_set_ti_thread_flag(current_thread_info(), flag) | |
101 | #define test_and_clear_thread_flag(flag) \ | |
102 | test_and_clear_ti_thread_flag(current_thread_info(), flag) | |
103 | #define test_thread_flag(flag) \ | |
104 | test_ti_thread_flag(current_thread_info(), flag) | |
105 | ||
ea811747 PZ |
106 | #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED) |
107 | ||
f3de272b RM |
108 | #if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK |
109 | /* | |
110 | * An arch can define its own version of set_restore_sigmask() to get the | |
111 | * job done however works, with or without TIF_RESTORE_SIGMASK. | |
112 | */ | |
113 | #define HAVE_SET_RESTORE_SIGMASK 1 | |
114 | ||
4e4c22c7 RM |
115 | /** |
116 | * set_restore_sigmask() - make sure saved_sigmask processing gets done | |
117 | * | |
118 | * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code | |
7648d961 RM |
119 | * will run before returning to user mode, to process the flag. For |
120 | * all callers, TIF_SIGPENDING is already set or it's no harm to set | |
121 | * it. TIF_RESTORE_SIGMASK need not be in the set of bits that the | |
122 | * arch code will notice on return to user mode, in case those bits | |
123 | * are scarce. We set TIF_SIGPENDING here to ensure that the arch | |
124 | * signal code always gets run when TIF_RESTORE_SIGMASK is set. | |
4e4c22c7 RM |
125 | */ |
126 | static inline void set_restore_sigmask(void) | |
127 | { | |
128 | set_thread_flag(TIF_RESTORE_SIGMASK); | |
edd63a27 | 129 | WARN_ON(!test_thread_flag(TIF_SIGPENDING)); |
4e4c22c7 | 130 | } |
4ebefe3e AV |
131 | static inline void clear_restore_sigmask(void) |
132 | { | |
133 | clear_thread_flag(TIF_RESTORE_SIGMASK); | |
134 | } | |
135 | static inline bool test_restore_sigmask(void) | |
136 | { | |
137 | return test_thread_flag(TIF_RESTORE_SIGMASK); | |
138 | } | |
139 | static inline bool test_and_clear_restore_sigmask(void) | |
140 | { | |
141 | return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK); | |
142 | } | |
f3de272b | 143 | #endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */ |
4e4c22c7 | 144 | |
754421c8 AV |
145 | #ifndef HAVE_SET_RESTORE_SIGMASK |
146 | #error "no set_restore_sigmask() provided and default one won't work" | |
147 | #endif | |
148 | ||
4e4c22c7 | 149 | #endif /* __KERNEL__ */ |
1da177e4 LT |
150 | |
151 | #endif /* _LINUX_THREAD_INFO_H */ |