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
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 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 */
132
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