152 строки
4.0 KiB
C
152 строки
4.0 KiB
C
/* 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_ACCOUNT | __GFP_NOTRACK | \
|
|
__GFP_ZERO)
|
|
#else
|
|
# define THREADINFO_GFP (GFP_KERNEL_ACCOUNT | __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 */
|