diff options
Diffstat (limited to 'kernel/include/linux/thread_info.h')
| -rw-r--r-- | kernel/include/linux/thread_info.h | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/kernel/include/linux/thread_info.h b/kernel/include/linux/thread_info.h new file mode 100644 index 000000000..be9f9dc6a --- /dev/null +++ b/kernel/include/linux/thread_info.h @@ -0,0 +1,160 @@ +/* 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 + +/* + * 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) + +#ifdef CONFIG_PREEMPT_LAZY +#define tif_need_resched() (test_thread_flag(TIF_NEED_RESCHED) || \ + test_thread_flag(TIF_NEED_RESCHED_LAZY)) +#define tif_need_resched_now() (test_thread_flag(TIF_NEED_RESCHED)) +#define tif_need_resched_lazy() test_thread_flag(TIF_NEED_RESCHED_LAZY)) + +#else +#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED) +#define tif_need_resched_now() test_thread_flag(TIF_NEED_RESCHED) +#define tif_need_resched_lazy() 0 +#endif + +#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 */ |