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 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 /* 58 * flag set/clear/test wrappers 59 * - pass TIF_xxxx constants to these functions 60 */ 61 62 static inline void set_ti_thread_flag(struct thread_info *ti, int flag) 63 { 64 set_bit(flag, (unsigned long *)&ti->flags); 65 } 66 67 static inline void clear_ti_thread_flag(struct thread_info *ti, int flag) 68 { 69 clear_bit(flag, (unsigned long *)&ti->flags); 70 } 71 72 static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag) 73 { 74 return test_and_set_bit(flag, (unsigned long *)&ti->flags); 75 } 76 77 static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag) 78 { 79 return test_and_clear_bit(flag, (unsigned long *)&ti->flags); 80 } 81 82 static inline int test_ti_thread_flag(struct thread_info *ti, int flag) 83 { 84 return test_bit(flag, (unsigned long *)&ti->flags); 85 } 86 87 #define set_thread_flag(flag) \ 88 set_ti_thread_flag(current_thread_info(), flag) 89 #define clear_thread_flag(flag) \ 90 clear_ti_thread_flag(current_thread_info(), flag) 91 #define test_and_set_thread_flag(flag) \ 92 test_and_set_ti_thread_flag(current_thread_info(), flag) 93 #define test_and_clear_thread_flag(flag) \ 94 test_and_clear_ti_thread_flag(current_thread_info(), flag) 95 #define test_thread_flag(flag) \ 96 test_ti_thread_flag(current_thread_info(), flag) 97 98 #define set_need_resched() set_thread_flag(TIF_NEED_RESCHED) 99 #define clear_need_resched() clear_thread_flag(TIF_NEED_RESCHED) 100 101 #if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK 102 /* 103 * An arch can define its own version of set_restore_sigmask() to get the 104 * job done however works, with or without TIF_RESTORE_SIGMASK. 105 */ 106 #define HAVE_SET_RESTORE_SIGMASK 1 107 108 /** 109 * set_restore_sigmask() - make sure saved_sigmask processing gets done 110 * 111 * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code 112 * will run before returning to user mode, to process the flag. For 113 * all callers, TIF_SIGPENDING is already set or it's no harm to set 114 * it. TIF_RESTORE_SIGMASK need not be in the set of bits that the 115 * arch code will notice on return to user mode, in case those bits 116 * are scarce. We set TIF_SIGPENDING here to ensure that the arch 117 * signal code always gets run when TIF_RESTORE_SIGMASK is set. 118 */ 119 static inline void set_restore_sigmask(void) 120 { 121 set_thread_flag(TIF_RESTORE_SIGMASK); 122 set_thread_flag(TIF_SIGPENDING); 123 } 124 #endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */ 125 126 #endif /* __KERNEL__ */ 127 128 #endif /* _LINUX_THREAD_INFO_H */ 129