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 | __GFP_NOTRACK | __GFP_ZERO) 60 #else 61 # define THREADINFO_GFP (GFP_KERNEL | __GFP_NOTRACK) 62 #endif 63 64 /* 65 * flag set/clear/test wrappers 66 * - pass TIF_xxxx constants to these functions 67 */ 68 69 static inline void set_ti_thread_flag(struct thread_info *ti, int flag) 70 { 71 set_bit(flag, (unsigned long *)&ti->flags); 72 } 73 74 static inline void clear_ti_thread_flag(struct thread_info *ti, int flag) 75 { 76 clear_bit(flag, (unsigned long *)&ti->flags); 77 } 78 79 static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag) 80 { 81 return test_and_set_bit(flag, (unsigned long *)&ti->flags); 82 } 83 84 static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag) 85 { 86 return test_and_clear_bit(flag, (unsigned long *)&ti->flags); 87 } 88 89 static inline int test_ti_thread_flag(struct thread_info *ti, int flag) 90 { 91 return test_bit(flag, (unsigned long *)&ti->flags); 92 } 93 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) 104 105 #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED) 106 107 #if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK 108 /* 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. 111 */ 112 #define HAVE_SET_RESTORE_SIGMASK 1 113 114 /** 115 * set_restore_sigmask() - make sure saved_sigmask processing gets done 116 * 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. 124 */ 125 static inline void set_restore_sigmask(void) 126 { 127 set_thread_flag(TIF_RESTORE_SIGMASK); 128 WARN_ON(!test_thread_flag(TIF_SIGPENDING)); 129 } 130 static inline void clear_restore_sigmask(void) 131 { 132 clear_thread_flag(TIF_RESTORE_SIGMASK); 133 } 134 static inline bool test_restore_sigmask(void) 135 { 136 return test_thread_flag(TIF_RESTORE_SIGMASK); 137 } 138 static inline bool test_and_clear_restore_sigmask(void) 139 { 140 return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK); 141 } 142 #endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */ 143 144 #ifndef HAVE_SET_RESTORE_SIGMASK 145 #error "no set_restore_sigmask() provided and default one won't work" 146 #endif 147 148 #endif /* __KERNEL__ */ 149 150 #endif /* _LINUX_THREAD_INFO_H */ 151