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