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;
16 #ifdef CONFIG_THREAD_INFO_IN_TASK
18 u32 flags; /* low level flags */
21 #define INIT_THREAD_INFO(tsk) \
27 #ifdef CONFIG_THREAD_INFO_IN_TASK
28 #define current_thread_info() ((struct thread_info *)current)
32 * System call restart block.
34 struct restart_block {
35 long (*fn)(struct restart_block *);
37 /* For futex_wait and futex_wait_requeue_pi */
49 struct timespec __user *rmtp;
51 struct compat_timespec __user *compat_rmtp;
57 struct pollfd __user *ufds;
61 unsigned long tv_nsec;
66 extern long do_no_restart_syscall(struct restart_block *parm);
68 #include <linux/bitops.h>
69 #include <asm/thread_info.h>
73 #define THREADINFO_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO)
76 * flag set/clear/test wrappers
77 * - pass TIF_xxxx constants to these functions
80 static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
82 set_bit(flag, (unsigned long *)&ti->flags);
85 static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
87 clear_bit(flag, (unsigned long *)&ti->flags);
90 static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
92 return test_and_set_bit(flag, (unsigned long *)&ti->flags);
95 static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
97 return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
100 static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
102 return test_bit(flag, (unsigned long *)&ti->flags);
105 #define set_thread_flag(flag) \
106 set_ti_thread_flag(current_thread_info(), flag)
107 #define clear_thread_flag(flag) \
108 clear_ti_thread_flag(current_thread_info(), flag)
109 #define test_and_set_thread_flag(flag) \
110 test_and_set_ti_thread_flag(current_thread_info(), flag)
111 #define test_and_clear_thread_flag(flag) \
112 test_and_clear_ti_thread_flag(current_thread_info(), flag)
113 #define test_thread_flag(flag) \
114 test_ti_thread_flag(current_thread_info(), flag)
116 #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
118 #if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK
120 * An arch can define its own version of set_restore_sigmask() to get the
121 * job done however works, with or without TIF_RESTORE_SIGMASK.
123 #define HAVE_SET_RESTORE_SIGMASK 1
126 * set_restore_sigmask() - make sure saved_sigmask processing gets done
128 * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code
129 * will run before returning to user mode, to process the flag. For
130 * all callers, TIF_SIGPENDING is already set or it's no harm to set
131 * it. TIF_RESTORE_SIGMASK need not be in the set of bits that the
132 * arch code will notice on return to user mode, in case those bits
133 * are scarce. We set TIF_SIGPENDING here to ensure that the arch
134 * signal code always gets run when TIF_RESTORE_SIGMASK is set.
136 static inline void set_restore_sigmask(void)
138 set_thread_flag(TIF_RESTORE_SIGMASK);
139 WARN_ON(!test_thread_flag(TIF_SIGPENDING));
141 static inline void clear_restore_sigmask(void)
143 clear_thread_flag(TIF_RESTORE_SIGMASK);
145 static inline bool test_restore_sigmask(void)
147 return test_thread_flag(TIF_RESTORE_SIGMASK);
149 static inline bool test_and_clear_restore_sigmask(void)
151 return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK);
153 #endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */
155 #ifndef HAVE_SET_RESTORE_SIGMASK
156 #error "no set_restore_sigmask() provided and default one won't work"
159 #endif /* __KERNEL__ */
161 #endif /* _LINUX_THREAD_INFO_H */