1 /* thread_info.h: common low-level thread information accessors 2 * 3 * Copyright (C) 2002 David Howells ([email protected]) 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 12 struct timespec; 13 struct compat_timespec; 14 15 /* 16 * System call restart block. 17 */ 18 struct restart_block { 19 long (*fn)(struct restart_block *); 20 union { 21 /* For futex_wait and futex_wait_requeue_pi */ 22 struct { 23 u32 __user *uaddr; 24 u32 val; 25 u32 flags; 26 u32 bitset; 27 u64 time; 28 u32 __user *uaddr2; 29 } futex; 30 /* For nanosleep */ 31 struct { 32 clockid_t clockid; 33 struct timespec __user *rmtp; 34 #ifdef CONFIG_COMPAT 35 struct compat_timespec __user *compat_rmtp; 36 #endif 37 u64 expires; 38 } nanosleep; 39 /* For poll */ 40 struct { 41 struct pollfd __user *ufds; 42 int nfds; 43 int has_timeout; 44 unsigned long tv_sec; 45 unsigned long tv_nsec; 46 } poll; 47 }; 48 }; 49 50 extern long do_no_restart_syscall(struct restart_block *parm); 51 52 #include <linux/bitops.h> 53 #include <asm/thread_info.h> 54 55 #ifdef __KERNEL__ 56 57 #ifdef CONFIG_DEBUG_STACK_USAGE 58 # define THREADINFO_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO) 59 #else 60 # define THREADINFO_GFP (GFP_KERNEL | __GFP_NOTRACK) 61 #endif 62 63 /* 64 * flag set/clear/test wrappers 65 * - pass TIF_xxxx constants to these functions 66 */ 67 68 static inline void set_ti_thread_flag(struct thread_info *ti, int flag) 69 { 70 set_bit(flag, (unsigned long *)&ti->flags); 71 } 72 73 static inline void clear_ti_thread_flag(struct thread_info *ti, int flag) 74 { 75 clear_bit(flag, (unsigned long *)&ti->flags); 76 } 77 78 static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag) 79 { 80 return test_and_set_bit(flag, (unsigned long *)&ti->flags); 81 } 82 83 static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag) 84 { 85 return test_and_clear_bit(flag, (unsigned long *)&ti->flags); 86 } 87 88 static inline int test_ti_thread_flag(struct thread_info *ti, int flag) 89 { 90 return test_bit(flag, (unsigned long *)&ti->flags); 91 } 92 93 #define set_thread_flag(flag) \ 94 set_ti_thread_flag(current_thread_info(), flag) 95 #define clear_thread_flag(flag) \ 96 clear_ti_thread_flag(current_thread_info(), flag) 97 #define test_and_set_thread_flag(flag) \ 98 test_and_set_ti_thread_flag(current_thread_info(), flag) 99 #define test_and_clear_thread_flag(flag) \ 100 test_and_clear_ti_thread_flag(current_thread_info(), flag) 101 #define test_thread_flag(flag) \ 102 test_ti_thread_flag(current_thread_info(), flag) 103 104 #define set_need_resched() set_thread_flag(TIF_NEED_RESCHED) 105 #define clear_need_resched() clear_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 set_thread_flag(TIF_SIGPENDING); 129 } 130 #endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */ 131 132 #endif /* __KERNEL__ */ 133 134 #endif /* _LINUX_THREAD_INFO_H */ 135