| 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 | |
| 13 | struct timespec; |
| 14 | struct compat_timespec; |
| 15 | |
| 16 | /* |
| 17 | * System call restart block. |
| 18 | */ |
| 19 | struct 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 | |
| 51 | extern 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 | |
| 70 | static inline void set_ti_thread_flag(struct thread_info *ti, int flag) |
| 71 | { |
| 72 | set_bit(flag, (unsigned long *)&ti->flags); |
| 73 | } |
| 74 | |
| 75 | static inline void clear_ti_thread_flag(struct thread_info *ti, int flag) |
| 76 | { |
| 77 | clear_bit(flag, (unsigned long *)&ti->flags); |
| 78 | } |
| 79 | |
| 80 | static 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 | |
| 85 | static 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 | |
| 90 | static 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 | */ |
| 126 | static inline void set_restore_sigmask(void) |
| 127 | { |
| 128 | set_thread_flag(TIF_RESTORE_SIGMASK); |
| 129 | WARN_ON(!test_thread_flag(TIF_SIGPENDING)); |
| 130 | } |
| 131 | static inline void clear_restore_sigmask(void) |
| 132 | { |
| 133 | clear_thread_flag(TIF_RESTORE_SIGMASK); |
| 134 | } |
| 135 | static inline bool test_restore_sigmask(void) |
| 136 | { |
| 137 | return test_thread_flag(TIF_RESTORE_SIGMASK); |
| 138 | } |
| 139 | static 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 */ |