LXR linux/include/linux/thread

   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#include <linux/bug.h>
  12
  13struct timespec;
  14struct compat_timespec;
  15
  16/*
  17 * System call restart block.
  18 */
  19struct restart_block {
  20        long (*fn)(struct restart_block *);
  21        union {
  22                /* For futex_wait and futex_wait_requeue_pi */
  23                struct {
  24                        u32 __user *uaddr;
  25                        u32 val;
  26                        u32 flags;
  27                        u32 bitset;
  28                        u64 time;
  29                        u32 __user *uaddr2;
  30                } futex;
  31                /* For nanosleep */
  32                struct {
  33                        clockid_t clockid;
  34                        struct timespec __user *rmtp;
  35#ifdef CONFIG_COMPAT
  36                        struct compat_timespec __user *compat_rmtp;
  37#endif
  38                        u64 expires;
  39                } nanosleep;
  40                /* For poll */
  41                struct {
  42                        struct pollfd __user *ufds;
  43                        int nfds;
  44                        int has_timeout;
  45                        unsigned long tv_sec;
  46                        unsigned long tv_nsec;
  47                } poll;
  48        };
  49};
  50
  51extern long do_no_restart_syscall(struct restart_block *parm);
  52
  53#include <linux/bitops.h>
  54#include <asm/thread_info.h>
  55
  56#ifdef __KERNEL__
  57
  58#ifdef CONFIG_DEBUG_STACK_USAGE
  59# define THREADINFO_GFP         (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK | \
  60                                 __GFP_ZERO)
  61#else
  62# define THREADINFO_GFP         (GFP_KERNEL_ACCOUNT | __GFP_NOTRACK)
  63#endif
  64
  65/*
  66 * flag set/clear/test wrappers
  67 * - pass TIF_xxxx constants to these functions
  68 */
  69
  70static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
  71{
  72        set_bit(flag, (unsigned long *)&ti->flags);
  73}
  74
  75static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
  76{
  77        clear_bit(flag, (unsigned long *)&ti->flags);
  78}
  79
  80static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
  81{
  82        return test_and_set_bit(flag, (unsigned long *)&ti->flags);
  83}
  84
  85static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
  86{
  87        return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
  88}
  89
  90static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
  91{
  92        return test_bit(flag, (unsigned long *)&ti->flags);
  93}
  94
  95#define set_thread_flag(flag) \
  96        set_ti_thread_flag(current_thread_info(), flag)
  97#define clear_thread_flag(flag) \
  98        clear_ti_thread_flag(current_thread_info(), flag)
  99#define test_and_set_thread_flag(flag) \
 100        test_and_set_ti_thread_flag(current_thread_info(), flag)
 101#define test_and_clear_thread_flag(flag) \
 102        test_and_clear_ti_thread_flag(current_thread_info(), flag)
 103#define test_thread_flag(flag) \
 104        test_ti_thread_flag(current_thread_info(), flag)
 105
 106#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
 107
 108#if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK
 109/*
 110 * An arch can define its own version of set_restore_sigmask() to get the
 111 * job done however works, with or without TIF_RESTORE_SIGMASK.
 112 */
 113#define HAVE_SET_RESTORE_SIGMASK        1
 114
 115/**
 116 * set_restore_sigmask() - make sure saved_sigmask processing gets done
 117 *
 118 * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code
 119 * will run before returning to user mode, to process the flag.  For
 120 * all callers, TIF_SIGPENDING is already set or it's no harm to set
 121 * it.  TIF_RESTORE_SIGMASK need not be in the set of bits that the
 122 * arch code will notice on return to user mode, in case those bits
 123 * are scarce.  We set TIF_SIGPENDING here to ensure that the arch
 124 * signal code always gets run when TIF_RESTORE_SIGMASK is set.
 125 */
 126static inline void set_restore_sigmask(void)
 127{
 128        set_thread_flag(TIF_RESTORE_SIGMASK);
 129        WARN_ON(!test_thread_flag(TIF_SIGPENDING));
 130}
 131static inline void clear_restore_sigmask(void)
 132{
 133        clear_thread_flag(TIF_RESTORE_SIGMASK);
 134}
 135static inline bool test_restore_sigmask(void)
 136{
 137        return test_thread_flag(TIF_RESTORE_SIGMASK);
 138}
 139static inline bool test_and_clear_restore_sigmask(void)
 140{
 141        return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK);
 142}
 143#endif  /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */
 144
 145#ifndef HAVE_SET_RESTORE_SIGMASK
 146#error "no set_restore_sigmask() provided and default one won't work"
 147#endif
 148
 149#endif  /* __KERNEL__ */
 150
 151#endif /* _LINUX_THREAD_INFO_H */
 152