thread_info.h

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/* thread_info.h: common low-level thread information accessors
 *
 * Copyright (C) 2002  David Howells ([email protected])
 * - 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 set_need_resched()  set_thread_flag(TIF_NEED_RESCHED)
#define clear_need_resched()    clear_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

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 */