1 /* thread_info.h: common low-level thread information accessors
3 * Copyright (C) 2002 David Howells (dhowells@redhat.com)
4 * - Incorporating suggestions made by Linus Torvalds
7 #ifndef _LINUX_THREAD_INFO_H
8 #define _LINUX_THREAD_INFO_H
10 #include <linux/types.h>
11 #include <linux/bug.h>
14 struct compat_timespec
;
17 * System call restart block.
19 struct restart_block
{
20 long (*fn
)(struct restart_block
*);
22 /* For futex_wait and futex_wait_requeue_pi */
34 struct timespec __user
*rmtp
;
36 struct compat_timespec __user
*compat_rmtp
;
42 struct pollfd __user
*ufds
;
46 unsigned long tv_nsec
;
51 extern long do_no_restart_syscall(struct restart_block
*parm
);
53 #include <linux/bitops.h>
54 #include <asm/thread_info.h>
58 #ifdef CONFIG_DEBUG_STACK_USAGE
59 # define THREADINFO_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO)
61 # define THREADINFO_GFP (GFP_KERNEL | __GFP_NOTRACK)
65 * flag set/clear/test wrappers
66 * - pass TIF_xxxx constants to these functions
69 static inline void set_ti_thread_flag(struct thread_info
*ti
, int flag
)
71 set_bit(flag
, (unsigned long *)&ti
->flags
);
74 static inline void clear_ti_thread_flag(struct thread_info
*ti
, int flag
)
76 clear_bit(flag
, (unsigned long *)&ti
->flags
);
79 static inline int test_and_set_ti_thread_flag(struct thread_info
*ti
, int flag
)
81 return test_and_set_bit(flag
, (unsigned long *)&ti
->flags
);
84 static inline int test_and_clear_ti_thread_flag(struct thread_info
*ti
, int flag
)
86 return test_and_clear_bit(flag
, (unsigned long *)&ti
->flags
);
89 static inline int test_ti_thread_flag(struct thread_info
*ti
, int flag
)
91 return test_bit(flag
, (unsigned long *)&ti
->flags
);
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)
105 #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
107 #if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK
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.
112 #define HAVE_SET_RESTORE_SIGMASK 1
115 * set_restore_sigmask() - make sure saved_sigmask processing gets done
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.
125 static inline void set_restore_sigmask(void)
127 set_thread_flag(TIF_RESTORE_SIGMASK
);
128 WARN_ON(!test_thread_flag(TIF_SIGPENDING
));
130 static inline void clear_restore_sigmask(void)
132 clear_thread_flag(TIF_RESTORE_SIGMASK
);
134 static inline bool test_restore_sigmask(void)
136 return test_thread_flag(TIF_RESTORE_SIGMASK
);
138 static inline bool test_and_clear_restore_sigmask(void)
140 return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK
);
142 #endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */
144 #ifndef HAVE_SET_RESTORE_SIGMASK
145 #error "no set_restore_sigmask() provided and default one won't work"
148 #endif /* __KERNEL__ */
150 #endif /* _LINUX_THREAD_INFO_H */
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