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                 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
  52 extern 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
  64 static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
  65 {
  66         set_bit(flag, (unsigned long *)&ti->flags);
  67 }
  68
  69 static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
  70 {
  71         clear_bit(flag, (unsigned long *)&ti->flags);
  72 }
  73
  74 static 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
  79 static 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
  84 static 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  */
 121 static 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 */