linux/include/linux/thread_info.h
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   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
  12struct timespec;
  13struct compat_timespec;
  14
  15/*
  16 * System call restart block.
  17 */
  18struct restart_block {
  19        long (*fn)(struct restart_block *);
  20        union {
  21                struct {
  22                        unsigned long arg0, arg1, arg2, arg3;
  23                };
  24                /* For futex_wait and futex_wait_requeue_pi */
  25                struct {
  26                        u32 *uaddr;
  27                        u32 val;
  28                        u32 flags;
  29                        u32 bitset;
  30                        u64 time;
  31                        u32 *uaddr2;
  32                } futex;
  33                /* For nanosleep */
  34                struct {
  35                        clockid_t index;
  36                        struct timespec __user *rmtp;
  37#ifdef CONFIG_COMPAT
  38                        struct compat_timespec __user *compat_rmtp;
  39#endif
  40                        u64 expires;
  41                } nanosleep;
  42                /* For poll */
  43                struct {
  44                        struct pollfd __user *ufds;
  45                        int nfds;
  46                        int has_timeout;
  47                        unsigned long tv_sec;
  48                        unsigned long tv_nsec;
  49                } poll;
  50        };
  51};
  52
  53extern long do_no_restart_syscall(struct restart_block *parm);
  54
  55#include <linux/bitops.h>
  56#include <asm/thread_info.h>
  57
  58#ifdef __KERNEL__
  59
  60/*
  61 * flag set/clear/test wrappers
  62 * - pass TIF_xxxx constants to these functions
  63 */
  64
  65static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
  66{
  67        set_bit(flag, (unsigned long *)&ti->flags);
  68}
  69
  70static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
  71{
  72        clear_bit(flag, (unsigned long *)&ti->flags);
  73}
  74
  75static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
  76{
  77        return test_and_set_bit(flag, (unsigned long *)&ti->flags);
  78}
  79
  80static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
  81{
  82        return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
  83}
  84
  85static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
  86{
  87        return test_bit(flag, (unsigned long *)&ti->flags);
  88}
  89
  90#define set_thread_flag(flag) \
  91        set_ti_thread_flag(current_thread_info(), flag)
  92#define clear_thread_flag(flag) \
  93        clear_ti_thread_flag(current_thread_info(), flag)
  94#define test_and_set_thread_flag(flag) \
  95        test_and_set_ti_thread_flag(current_thread_info(), flag)
  96#define test_and_clear_thread_flag(flag) \
  97        test_and_clear_ti_thread_flag(current_thread_info(), flag)
  98#define test_thread_flag(flag) \
  99        test_ti_thread_flag(current_thread_info(), flag)
 100
 101#define set_need_resched()      set_thread_flag(TIF_NEED_RESCHED)
 102#define clear_need_resched()    clear_thread_flag(TIF_NEED_RESCHED)
 103
 104#if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK
 105/*
 106 * An arch can define its own version of set_restore_sigmask() to get the
 107 * job done however works, with or without TIF_RESTORE_SIGMASK.
 108 */
 109#define HAVE_SET_RESTORE_SIGMASK        1
 110
 111/**
 112 * set_restore_sigmask() - make sure saved_sigmask processing gets done
 113 *
 114 * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code
 115 * will run before returning to user mode, to process the flag.  For
 116 * all callers, TIF_SIGPENDING is already set or it's no harm to set
 117 * it.  TIF_RESTORE_SIGMASK need not be in the set of bits that the
 118 * arch code will notice on return to user mode, in case those bits
 119 * are scarce.  We set TIF_SIGPENDING here to ensure that the arch
 120 * signal code always gets run when TIF_RESTORE_SIGMASK is set.
 121 */
 122static inline void set_restore_sigmask(void)
 123{
 124        set_thread_flag(TIF_RESTORE_SIGMASK);
 125        set_thread_flag(TIF_SIGPENDING);
 126}
 127#endif  /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */
 128
 129#endif  /* __KERNEL__ */
 130
 131#endif /* _LINUX_THREAD_INFO_H */
 132
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