include/linux/thread_info.h

   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 index;
  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 */