Linux kernel mirror (for testing)
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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#include <linux/bug.h>
12
13struct timespec;
14struct compat_timespec;
15
16/*
17 * System call restart block.
18 */
19struct 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
51extern 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_ACCOUNT | __GFP_NOTRACK | \
60 __GFP_ZERO)
61#else
62# define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK)
63#endif
64
65/*
66 * flag set/clear/test wrappers
67 * - pass TIF_xxxx constants to these functions
68 */
69
70static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
71{
72 set_bit(flag, (unsigned long *)&ti->flags);
73}
74
75static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
76{
77 clear_bit(flag, (unsigned long *)&ti->flags);
78}
79
80static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
81{
82 return test_and_set_bit(flag, (unsigned long *)&ti->flags);
83}
84
85static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
86{
87 return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
88}
89
90static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
91{
92 return test_bit(flag, (unsigned long *)&ti->flags);
93}
94
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
106#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
107
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
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
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.
125 */
126static inline void set_restore_sigmask(void)
127{
128 set_thread_flag(TIF_RESTORE_SIGMASK);
129 WARN_ON(!test_thread_flag(TIF_SIGPENDING));
130}
131static inline void clear_restore_sigmask(void)
132{
133 clear_thread_flag(TIF_RESTORE_SIGMASK);
134}
135static inline bool test_restore_sigmask(void)
136{
137 return test_thread_flag(TIF_RESTORE_SIGMASK);
138}
139static inline bool test_and_clear_restore_sigmask(void)
140{
141 return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK);
142}
143#endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */
144
145#ifndef HAVE_SET_RESTORE_SIGMASK
146#error "no set_restore_sigmask() provided and default one won't work"
147#endif
148
149#endif /* __KERNEL__ */
150
151#endif /* _LINUX_THREAD_INFO_H */