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)
64 #define THREADINFO_GFP_ACCOUNTED (THREADINFO_GFP | __GFP_KMEMCG)
67 * flag set/clear/test wrappers
68 * - pass TIF_xxxx constants to these functions
71 static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
73 set_bit(flag, (unsigned long *)&ti->flags);
76 static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
78 clear_bit(flag, (unsigned long *)&ti->flags);
81 static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
83 return test_and_set_bit(flag, (unsigned long *)&ti->flags);
86 static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
88 return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
91 static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
93 return test_bit(flag, (unsigned long *)&ti->flags);
96 #define set_thread_flag(flag) \
97 set_ti_thread_flag(current_thread_info(), flag)
98 #define clear_thread_flag(flag) \
99 clear_ti_thread_flag(current_thread_info(), flag)
100 #define test_and_set_thread_flag(flag) \
101 test_and_set_ti_thread_flag(current_thread_info(), flag)
102 #define test_and_clear_thread_flag(flag) \
103 test_and_clear_ti_thread_flag(current_thread_info(), flag)
104 #define test_thread_flag(flag) \
105 test_ti_thread_flag(current_thread_info(), flag)
107 #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
109 #if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK
111 * An arch can define its own version of set_restore_sigmask() to get the
112 * job done however works, with or without TIF_RESTORE_SIGMASK.
114 #define HAVE_SET_RESTORE_SIGMASK 1
117 * set_restore_sigmask() - make sure saved_sigmask processing gets done
119 * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code
120 * will run before returning to user mode, to process the flag. For
121 * all callers, TIF_SIGPENDING is already set or it's no harm to set
122 * it. TIF_RESTORE_SIGMASK need not be in the set of bits that the
123 * arch code will notice on return to user mode, in case those bits
124 * are scarce. We set TIF_SIGPENDING here to ensure that the arch
125 * signal code always gets run when TIF_RESTORE_SIGMASK is set.
127 static inline void set_restore_sigmask(void)
129 set_thread_flag(TIF_RESTORE_SIGMASK);
130 WARN_ON(!test_thread_flag(TIF_SIGPENDING));
132 static inline void clear_restore_sigmask(void)
134 clear_thread_flag(TIF_RESTORE_SIGMASK);
136 static inline bool test_restore_sigmask(void)
138 return test_thread_flag(TIF_RESTORE_SIGMASK);
140 static inline bool test_and_clear_restore_sigmask(void)
142 return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK);
144 #endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */
146 #ifndef HAVE_SET_RESTORE_SIGMASK
147 #error "no set_restore_sigmask() provided and default one won't work"
150 #endif /* __KERNEL__ */
152 #endif /* _LINUX_THREAD_INFO_H */