| /* thread_info.h: common low-level thread information accessors |
| * |
| * Copyright (C) 2002 David Howells (dhowells@redhat.com) |
| * - Incorporating suggestions made by Linus Torvalds |
| */ |
| |
| #ifndef _LINUX_THREAD_INFO_H |
| #define _LINUX_THREAD_INFO_H |
| |
| #include <linux/types.h> |
| #include <linux/bug.h> |
| |
| struct timespec; |
| struct compat_timespec; |
| |
| /* |
| * System call restart block. |
| */ |
| struct restart_block { |
| long (*fn)(struct restart_block *); |
| union { |
| /* For futex_wait and futex_wait_requeue_pi */ |
| struct { |
| u32 __user *uaddr; |
| u32 val; |
| u32 flags; |
| u32 bitset; |
| u64 time; |
| u32 __user *uaddr2; |
| } futex; |
| /* For nanosleep */ |
| struct { |
| clockid_t clockid; |
| struct timespec __user *rmtp; |
| #ifdef CONFIG_COMPAT |
| struct compat_timespec __user *compat_rmtp; |
| #endif |
| u64 expires; |
| } nanosleep; |
| /* For poll */ |
| struct { |
| struct pollfd __user *ufds; |
| int nfds; |
| int has_timeout; |
| unsigned long tv_sec; |
| unsigned long tv_nsec; |
| } poll; |
| }; |
| }; |
| |
| extern long do_no_restart_syscall(struct restart_block *parm); |
| |
| #include <linux/bitops.h> |
| #include <asm/thread_info.h> |
| |
| #ifdef __KERNEL__ |
| |
| #ifdef CONFIG_DEBUG_STACK_USAGE |
| # define THREADINFO_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO) |
| #else |
| # define THREADINFO_GFP (GFP_KERNEL | __GFP_NOTRACK) |
| #endif |
| |
| #define THREADINFO_GFP_ACCOUNTED (THREADINFO_GFP | __GFP_KMEMCG) |
| |
| /* |
| * flag set/clear/test wrappers |
| * - pass TIF_xxxx constants to these functions |
| */ |
| |
| static inline void set_ti_thread_flag(struct thread_info *ti, int flag) |
| { |
| set_bit(flag, (unsigned long *)&ti->flags); |
| } |
| |
| static inline void clear_ti_thread_flag(struct thread_info *ti, int flag) |
| { |
| clear_bit(flag, (unsigned long *)&ti->flags); |
| } |
| |
| static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag) |
| { |
| return test_and_set_bit(flag, (unsigned long *)&ti->flags); |
| } |
| |
| static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag) |
| { |
| return test_and_clear_bit(flag, (unsigned long *)&ti->flags); |
| } |
| |
| static inline int test_ti_thread_flag(struct thread_info *ti, int flag) |
| { |
| return test_bit(flag, (unsigned long *)&ti->flags); |
| } |
| |
| #define set_thread_flag(flag) \ |
| set_ti_thread_flag(current_thread_info(), flag) |
| #define clear_thread_flag(flag) \ |
| clear_ti_thread_flag(current_thread_info(), flag) |
| #define test_and_set_thread_flag(flag) \ |
| test_and_set_ti_thread_flag(current_thread_info(), flag) |
| #define test_and_clear_thread_flag(flag) \ |
| test_and_clear_ti_thread_flag(current_thread_info(), flag) |
| #define test_thread_flag(flag) \ |
| test_ti_thread_flag(current_thread_info(), flag) |
| |
| #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED) |
| |
| #if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK |
| /* |
| * An arch can define its own version of set_restore_sigmask() to get the |
| * job done however works, with or without TIF_RESTORE_SIGMASK. |
| */ |
| #define HAVE_SET_RESTORE_SIGMASK 1 |
| |
| /** |
| * set_restore_sigmask() - make sure saved_sigmask processing gets done |
| * |
| * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code |
| * will run before returning to user mode, to process the flag. For |
| * all callers, TIF_SIGPENDING is already set or it's no harm to set |
| * it. TIF_RESTORE_SIGMASK need not be in the set of bits that the |
| * arch code will notice on return to user mode, in case those bits |
| * are scarce. We set TIF_SIGPENDING here to ensure that the arch |
| * signal code always gets run when TIF_RESTORE_SIGMASK is set. |
| */ |
| static inline void set_restore_sigmask(void) |
| { |
| set_thread_flag(TIF_RESTORE_SIGMASK); |
| WARN_ON(!test_thread_flag(TIF_SIGPENDING)); |
| } |
| static inline void clear_restore_sigmask(void) |
| { |
| clear_thread_flag(TIF_RESTORE_SIGMASK); |
| } |
| static inline bool test_restore_sigmask(void) |
| { |
| return test_thread_flag(TIF_RESTORE_SIGMASK); |
| } |
| static inline bool test_and_clear_restore_sigmask(void) |
| { |
| return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK); |
| } |
| #endif /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */ |
| |
| #ifndef HAVE_SET_RESTORE_SIGMASK |
| #error "no set_restore_sigmask() provided and default one won't work" |
| #endif |
| |
| #endif /* __KERNEL__ */ |
| |
| #endif /* _LINUX_THREAD_INFO_H */ |