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