root/include/linux/thread_info.h

INCLUDED FROM

DEFINITIONS

1. set_ti_thread_flag
2. clear_ti_thread_flag
3. test_and_set_ti_thread_flag
4. test_and_clear_ti_thread_flag
5. test_ti_thread_flag
6. set_restore_sigmask
7. clear_restore_sigmask
8. test_restore_sigmask
9. test_and_clear_restore_sigmask

/* thread_info.h: common low-level thread information accessors
 *
 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
 * - Incorporating suggestions made by Linus Torvalds
 */

#ifndef _LINUX_THREAD_INFO_H
#define _LINUX_THREAD_INFO_H

#include <linux/types.h>
#include <linux/bug.h>

struct timespec;
struct compat_timespec;

/*
 * System call restart block.
 */
struct restart_block {
        long (*fn)(struct restart_block *);
        union {
                /* For futex_wait and futex_wait_requeue_pi */
                struct {
                        u32 __user *uaddr;
                        u32 val;
                        u32 flags;
                        u32 bitset;
                        u64 time;
                        u32 __user *uaddr2;
                } futex;
                /* For nanosleep */
                struct {
                        clockid_t clockid;
                        struct timespec __user *rmtp;
#ifdef CONFIG_COMPAT
                        struct compat_timespec __user *compat_rmtp;
#endif
                        u64 expires;
                } nanosleep;
                /* For poll */
                struct {
                        struct pollfd __user *ufds;
                        int nfds;
                        int has_timeout;
                        unsigned long tv_sec;
                        unsigned long tv_nsec;
                } poll;
        };
};

extern long do_no_restart_syscall(struct restart_block *parm);

#include <linux/bitops.h>
#include <asm/thread_info.h>

#ifdef __KERNEL__

#ifdef CONFIG_DEBUG_STACK_USAGE
# define THREADINFO_GFP         (GFP_KERNEL | __GFP_NOTRACK | __GFP_ZERO)
#else
# define THREADINFO_GFP         (GFP_KERNEL | __GFP_NOTRACK)
#endif

/*
 * flag set/clear/test wrappers
 * - pass TIF_xxxx constants to these functions
 */

static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
{
        set_bit(flag, (unsigned long *)&ti->flags);
}

static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
{
        clear_bit(flag, (unsigned long *)&ti->flags);
}

static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
{
        return test_and_set_bit(flag, (unsigned long *)&ti->flags);
}

static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
{
        return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
}

static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
{
        return test_bit(flag, (unsigned long *)&ti->flags);
}

#define set_thread_flag(flag) \
        set_ti_thread_flag(current_thread_info(), flag)
#define clear_thread_flag(flag) \
        clear_ti_thread_flag(current_thread_info(), flag)
#define test_and_set_thread_flag(flag) \
        test_and_set_ti_thread_flag(current_thread_info(), flag)
#define test_and_clear_thread_flag(flag) \
        test_and_clear_ti_thread_flag(current_thread_info(), flag)
#define test_thread_flag(flag) \
        test_ti_thread_flag(current_thread_info(), flag)

#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)

#if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK
/*
 * An arch can define its own version of set_restore_sigmask() to get the
 * job done however works, with or without TIF_RESTORE_SIGMASK.
 */
#define HAVE_SET_RESTORE_SIGMASK        1

/**
 * set_restore_sigmask() - make sure saved_sigmask processing gets done
 *
 * This sets TIF_RESTORE_SIGMASK and ensures that the arch signal code
 * will run before returning to user mode, to process the flag.  For
 * all callers, TIF_SIGPENDING is already set or it's no harm to set
 * it.  TIF_RESTORE_SIGMASK need not be in the set of bits that the
 * arch code will notice on return to user mode, in case those bits
 * are scarce.  We set TIF_SIGPENDING here to ensure that the arch
 * signal code always gets run when TIF_RESTORE_SIGMASK is set.
 */
static inline void set_restore_sigmask(void)
{
        set_thread_flag(TIF_RESTORE_SIGMASK);
        WARN_ON(!test_thread_flag(TIF_SIGPENDING));
}
static inline void clear_restore_sigmask(void)
{
        clear_thread_flag(TIF_RESTORE_SIGMASK);
}
static inline bool test_restore_sigmask(void)
{
        return test_thread_flag(TIF_RESTORE_SIGMASK);
}
static inline bool test_and_clear_restore_sigmask(void)
{
        return test_and_clear_thread_flag(TIF_RESTORE_SIGMASK);
}
#endif  /* TIF_RESTORE_SIGMASK && !HAVE_SET_RESTORE_SIGMASK */

#ifndef HAVE_SET_RESTORE_SIGMASK
#error "no set_restore_sigmask() provided and default one won't work"
#endif

#endif  /* __KERNEL__ */

#endif /* _LINUX_THREAD_INFO_H */