1,911 → 1,911 |
#ifndef _LINUX_SCHED_H |
#define _LINUX_SCHED_H |
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#include <asm/param.h> /* for HZ */ |
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#include <linux/config.h> |
#include <linux/capability.h> |
#include <linux/threads.h> |
#include <linux/kernel.h> |
#include <linux/types.h> |
#include <linux/timex.h> |
#include <linux/jiffies.h> |
#include <linux/rbtree.h> |
#include <linux/thread_info.h> |
#include <linux/cpumask.h> |
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#include <asm/system.h> |
#include <asm/semaphore.h> |
#include <asm/page.h> |
#include <asm/ptrace.h> |
#include <asm/mmu.h> |
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#include <linux/smp.h> |
#include <linux/sem.h> |
#include <linux/signal.h> |
#include <linux/securebits.h> |
#include <linux/fs_struct.h> |
#include <linux/compiler.h> |
#include <linux/completion.h> |
#include <linux/pid.h> |
#include <linux/percpu.h> |
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struct exec_domain; |
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/* |
* cloning flags: |
*/ |
#define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ |
#define CLONE_VM 0x00000100 /* set if VM shared between processes */ |
#define CLONE_FS 0x00000200 /* set if fs info shared between processes */ |
#define CLONE_FILES 0x00000400 /* set if open files shared between processes */ |
#define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */ |
#define CLONE_IDLETASK 0x00001000 /* set if new pid should be 0 (kernel only)*/ |
#define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */ |
#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ |
#define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */ |
#define CLONE_THREAD 0x00010000 /* Same thread group? */ |
#define CLONE_NEWNS 0x00020000 /* New namespace group? */ |
#define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */ |
#define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */ |
#define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */ |
#define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */ |
#define CLONE_DETACHED 0x00400000 /* Not used - CLONE_THREAD implies detached uniquely */ |
#define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */ |
#define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */ |
#define CLONE_STOPPED 0x02000000 /* Start in stopped state */ |
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/* |
* List of flags we want to share for kernel threads, |
* if only because they are not used by them anyway. |
*/ |
#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) |
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/* |
* These are the constant used to fake the fixed-point load-average |
* counting. Some notes: |
* - 11 bit fractions expand to 22 bits by the multiplies: this gives |
* a load-average precision of 10 bits integer + 11 bits fractional |
* - if you want to count load-averages more often, you need more |
* precision, or rounding will get you. With 2-second counting freq, |
* the EXP_n values would be 1981, 2034 and 2043 if still using only |
* 11 bit fractions. |
*/ |
extern unsigned long avenrun[]; /* Load averages */ |
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#define FSHIFT 11 /* nr of bits of precision */ |
#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ |
#define LOAD_FREQ (5*HZ) /* 5 sec intervals */ |
#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ |
#define EXP_5 2014 /* 1/exp(5sec/5min) */ |
#define EXP_15 2037 /* 1/exp(5sec/15min) */ |
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#define CALC_LOAD(load,exp,n) \ |
load *= exp; \ |
load += n*(FIXED_1-exp); \ |
load >>= FSHIFT; |
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#define CT_TO_SECS(x) ((x) / HZ) |
#define CT_TO_USECS(x) (((x) % HZ) * 1000000/HZ) |
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extern int nr_threads; |
extern int last_pid; |
DECLARE_PER_CPU(unsigned long, process_counts); |
extern int nr_processes(void); |
extern unsigned long nr_running(void); |
extern unsigned long nr_uninterruptible(void); |
extern unsigned long nr_iowait(void); |
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#include <linux/time.h> |
#include <linux/param.h> |
#include <linux/resource.h> |
#include <linux/timer.h> |
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#include <asm/processor.h> |
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#define TASK_RUNNING 0 |
#define TASK_INTERRUPTIBLE 1 |
#define TASK_UNINTERRUPTIBLE 2 |
#define TASK_STOPPED 4 |
#define TASK_ZOMBIE 8 |
#define TASK_DEAD 16 |
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#define __set_task_state(tsk, state_value) \ |
do { (tsk)->state = (state_value); } while (0) |
#define set_task_state(tsk, state_value) \ |
set_mb((tsk)->state, (state_value)) |
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#define __set_current_state(state_value) \ |
do { current->state = (state_value); } while (0) |
#define set_current_state(state_value) \ |
set_mb(current->state, (state_value)) |
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/* |
* Scheduling policies |
*/ |
#define SCHED_NORMAL 0 |
#define SCHED_FIFO 1 |
#define SCHED_RR 2 |
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struct sched_param { |
int sched_priority; |
}; |
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#ifdef __KERNEL__ |
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#include <linux/spinlock.h> |
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/* |
* This serializes "schedule()" and also protects |
* the run-queue from deletions/modifications (but |
* _adding_ to the beginning of the run-queue has |
* a separate lock). |
*/ |
extern rwlock_t tasklist_lock; |
extern spinlock_t mmlist_lock; |
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typedef struct task_struct task_t; |
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extern void sched_init(void); |
extern void init_idle(task_t *idle, int cpu); |
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extern void show_state(void); |
extern void show_regs(struct pt_regs *); |
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/* |
* TASK is a pointer to the task whose backtrace we want to see (or NULL for current |
* task), SP is the stack pointer of the first frame that should be shown in the back |
* trace (or NULL if the entire call-chain of the task should be shown). |
*/ |
extern void show_stack(struct task_struct *task, unsigned long *sp); |
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void io_schedule(void); |
long io_schedule_timeout(long timeout); |
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extern void cpu_init (void); |
extern void trap_init(void); |
extern void update_process_times(int user); |
extern void update_one_process(struct task_struct *p, unsigned long user, |
unsigned long system, int cpu); |
extern void scheduler_tick(int user_tick, int system); |
extern unsigned long cache_decay_ticks; |
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#define MAX_SCHEDULE_TIMEOUT LONG_MAX |
extern signed long FASTCALL(schedule_timeout(signed long timeout)); |
asmlinkage void schedule(void); |
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struct namespace; |
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/* Maximum number of active map areas.. This is a random (large) number */ |
#define MAX_MAP_COUNT (65536) |
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#include <linux/aio.h> |
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struct mm_struct { |
struct vm_area_struct * mmap; /* list of VMAs */ |
struct rb_root mm_rb; |
struct vm_area_struct * mmap_cache; /* last find_vma result */ |
unsigned long free_area_cache; /* first hole */ |
pgd_t * pgd; |
atomic_t mm_users; /* How many users with user space? */ |
atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ |
int map_count; /* number of VMAs */ |
struct rw_semaphore mmap_sem; |
spinlock_t page_table_lock; /* Protects task page tables and mm->rss */ |
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struct list_head mmlist; /* List of all active mm's. These are globally strung |
* together off init_mm.mmlist, and are protected |
* by mmlist_lock |
*/ |
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unsigned long start_code, end_code, start_data, end_data; |
unsigned long start_brk, brk, start_stack; |
unsigned long arg_start, arg_end, env_start, env_end; |
unsigned long rss, total_vm, locked_vm; |
unsigned long def_flags; |
cpumask_t cpu_vm_mask; |
unsigned long swap_address; |
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unsigned long saved_auxv[40]; /* for /proc/PID/auxv */ |
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unsigned dumpable:1; |
#ifdef CONFIG_HUGETLB_PAGE |
int used_hugetlb; |
#endif |
/* Architecture-specific MM context */ |
mm_context_t context; |
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/* coredumping support */ |
int core_waiters; |
struct completion *core_startup_done, core_done; |
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/* aio bits */ |
rwlock_t ioctx_list_lock; |
struct kioctx *ioctx_list; |
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struct kioctx default_kioctx; |
}; |
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extern int mmlist_nr; |
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struct sighand_struct { |
atomic_t count; |
struct k_sigaction action[_NSIG]; |
spinlock_t siglock; |
}; |
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/* |
* NOTE! "signal_struct" does not have it's own |
* locking, because a shared signal_struct always |
* implies a shared sighand_struct, so locking |
* sighand_struct is always a proper superset of |
* the locking of signal_struct. |
*/ |
struct signal_struct { |
atomic_t count; |
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/* current thread group signal load-balancing target: */ |
task_t *curr_target; |
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/* shared signal handling: */ |
struct sigpending shared_pending; |
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/* thread group exit support */ |
int group_exit; |
int group_exit_code; |
/* overloaded: |
* - notify group_exit_task when ->count is equal to notify_count |
* - everyone except group_exit_task is stopped during signal delivery |
* of fatal signals, group_exit_task processes the signal. |
*/ |
struct task_struct *group_exit_task; |
int notify_count; |
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/* thread group stop support, overloads group_exit_code too */ |
int group_stop_count; |
}; |
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/* |
* Priority of a process goes from 0..MAX_PRIO-1, valid RT |
* priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL tasks are |
* in the range MAX_RT_PRIO..MAX_PRIO-1. Priority values |
* are inverted: lower p->prio value means higher priority. |
* |
* The MAX_RT_USER_PRIO value allows the actual maximum |
* RT priority to be separate from the value exported to |
* user-space. This allows kernel threads to set their |
* priority to a value higher than any user task. Note: |
* MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. |
*/ |
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#define MAX_USER_RT_PRIO 100 |
#define MAX_RT_PRIO MAX_USER_RT_PRIO |
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#define MAX_PRIO (MAX_RT_PRIO + 40) |
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#define rt_task(p) ((p)->prio < MAX_RT_PRIO) |
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/* |
* Some day this will be a full-fledged user tracking system.. |
*/ |
struct user_struct { |
atomic_t __count; /* reference count */ |
atomic_t processes; /* How many processes does this user have? */ |
atomic_t files; /* How many open files does this user have? */ |
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/* Hash table maintenance information */ |
struct list_head uidhash_list; |
uid_t uid; |
}; |
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extern struct user_struct *find_user(uid_t); |
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extern struct user_struct root_user; |
#define INIT_USER (&root_user) |
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typedef struct prio_array prio_array_t; |
struct backing_dev_info; |
struct reclaim_state; |
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/* POSIX.1b interval timer structure. */ |
struct k_itimer { |
struct list_head list; /* free/ allocate list */ |
spinlock_t it_lock; |
clockid_t it_clock; /* which timer type */ |
timer_t it_id; /* timer id */ |
int it_overrun; /* overrun on pending signal */ |
int it_overrun_last; /* overrun on last delivered signal */ |
int it_requeue_pending; /* waiting to requeue this timer */ |
int it_sigev_notify; /* notify word of sigevent struct */ |
int it_sigev_signo; /* signo word of sigevent struct */ |
sigval_t it_sigev_value; /* value word of sigevent struct */ |
unsigned long it_incr; /* interval specified in jiffies */ |
struct task_struct *it_process; /* process to send signal to */ |
struct timer_list it_timer; |
struct sigqueue *sigq; /* signal queue entry. */ |
}; |
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struct io_context; /* See blkdev.h */ |
void exit_io_context(void); |
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struct task_struct { |
volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ |
struct thread_info *thread_info; |
atomic_t usage; |
unsigned long flags; /* per process flags, defined below */ |
unsigned long ptrace; |
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int lock_depth; /* Lock depth */ |
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int prio, static_prio; |
struct list_head run_list; |
prio_array_t *array; |
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unsigned long sleep_avg; |
long interactive_credit; |
unsigned long long timestamp; |
int activated; |
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unsigned long policy; |
cpumask_t cpus_allowed; |
unsigned int time_slice, first_time_slice; |
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struct list_head tasks; |
struct list_head ptrace_children; |
struct list_head ptrace_list; |
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struct mm_struct *mm, *active_mm; |
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/* task state */ |
struct linux_binfmt *binfmt; |
int exit_code, exit_signal; |
int pdeath_signal; /* The signal sent when the parent dies */ |
/* ??? */ |
unsigned long personality; |
int did_exec:1; |
pid_t pid; |
pid_t __pgrp; /* Accessed via process_group() */ |
pid_t tty_old_pgrp; |
pid_t session; |
pid_t tgid; |
/* boolean value for session group leader */ |
int leader; |
/* |
* pointers to (original) parent process, youngest child, younger sibling, |
* older sibling, respectively. (p->father can be replaced with |
* p->parent->pid) |
*/ |
struct task_struct *real_parent; /* real parent process (when being debugged) */ |
struct task_struct *parent; /* parent process */ |
struct list_head children; /* list of my children */ |
struct list_head sibling; /* linkage in my parent's children list */ |
struct task_struct *group_leader; /* threadgroup leader */ |
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/* PID/PID hash table linkage. */ |
struct pid_link pids[PIDTYPE_MAX]; |
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wait_queue_head_t wait_chldexit; /* for wait4() */ |
struct completion *vfork_done; /* for vfork() */ |
int __user *set_child_tid; /* CLONE_CHILD_SETTID */ |
int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ |
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unsigned long rt_priority; |
unsigned long it_real_value, it_prof_value, it_virt_value; |
unsigned long it_real_incr, it_prof_incr, it_virt_incr; |
struct timer_list real_timer; |
struct list_head posix_timers; /* POSIX.1b Interval Timers */ |
unsigned long utime, stime, cutime, cstime; |
unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; /* context switch counts */ |
u64 start_time; |
/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
unsigned long min_flt, maj_flt, nswap, cmin_flt, cmaj_flt, cnswap; |
/* process credentials */ |
uid_t uid,euid,suid,fsuid; |
gid_t gid,egid,sgid,fsgid; |
int ngroups; |
gid_t groups[NGROUPS]; |
kernel_cap_t cap_effective, cap_inheritable, cap_permitted; |
int keep_capabilities:1; |
struct user_struct *user; |
/* limits */ |
struct rlimit rlim[RLIM_NLIMITS]; |
unsigned short used_math; |
char comm[16]; |
/* file system info */ |
int link_count, total_link_count; |
struct tty_struct *tty; /* NULL if no tty */ |
/* ipc stuff */ |
struct sysv_sem sysvsem; |
/* CPU-specific state of this task */ |
struct thread_struct thread; |
/* filesystem information */ |
struct fs_struct *fs; |
/* open file information */ |
struct files_struct *files; |
/* namespace */ |
struct namespace *namespace; |
/* signal handlers */ |
struct signal_struct *signal; |
struct sighand_struct *sighand; |
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sigset_t blocked, real_blocked; |
struct sigpending pending; |
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unsigned long sas_ss_sp; |
size_t sas_ss_size; |
int (*notifier)(void *priv); |
void *notifier_data; |
sigset_t *notifier_mask; |
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void *security; |
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/* Thread group tracking */ |
u32 parent_exec_id; |
u32 self_exec_id; |
/* Protection of (de-)allocation: mm, files, fs, tty */ |
spinlock_t alloc_lock; |
/* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */ |
spinlock_t proc_lock; |
/* context-switch lock */ |
spinlock_t switch_lock; |
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/* journalling filesystem info */ |
void *journal_info; |
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/* VM state */ |
struct reclaim_state *reclaim_state; |
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struct dentry *proc_dentry; |
struct backing_dev_info *backing_dev_info; |
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struct io_context *io_context; |
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unsigned long ptrace_message; |
siginfo_t *last_siginfo; /* For ptrace use. */ |
}; |
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static inline pid_t process_group(struct task_struct *tsk) |
{ |
return tsk->group_leader->__pgrp; |
} |
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extern void __put_task_struct(struct task_struct *tsk); |
#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
#define put_task_struct(tsk) \ |
do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0) |
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/* |
* Per process flags |
*/ |
#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ |
/* Not implemented yet, only for 486*/ |
#define PF_STARTING 0x00000002 /* being created */ |
#define PF_EXITING 0x00000004 /* getting shut down */ |
#define PF_DEAD 0x00000008 /* Dead */ |
#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ |
#define PF_DUMPCORE 0x00000200 /* dumped core */ |
#define PF_SIGNALED 0x00000400 /* killed by a signal */ |
#define PF_MEMALLOC 0x00000800 /* Allocating memory */ |
#define PF_MEMDIE 0x00001000 /* Killed for out-of-memory */ |
#define PF_FLUSHER 0x00002000 /* responsible for disk writeback */ |
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#define PF_FREEZE 0x00004000 /* this task should be frozen for suspend */ |
#define PF_IOTHREAD 0x00008000 /* this thread is needed for doing I/O to swap */ |
#define PF_FROZEN 0x00010000 /* frozen for system suspend */ |
#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ |
#define PF_KSWAPD 0x00040000 /* I am kswapd */ |
#define PF_SWAPOFF 0x00080000 /* I am in swapoff */ |
#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
#define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */ |
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#ifdef CONFIG_SMP |
extern int set_cpus_allowed(task_t *p, cpumask_t new_mask); |
#else |
static inline int set_cpus_allowed(task_t *p, cpumask_t new_mask) |
{ |
return 0; |
} |
#endif |
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extern unsigned long long sched_clock(void); |
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#ifdef CONFIG_NUMA |
extern void sched_balance_exec(void); |
extern void node_nr_running_init(void); |
#else |
#define sched_balance_exec() {} |
#define node_nr_running_init() {} |
#endif |
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extern void set_user_nice(task_t *p, long nice); |
extern int task_prio(task_t *p); |
extern int task_nice(task_t *p); |
extern int task_curr(task_t *p); |
extern int idle_cpu(int cpu); |
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void yield(void); |
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/* |
* The default (Linux) execution domain. |
*/ |
extern struct exec_domain default_exec_domain; |
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#ifndef INIT_THREAD_SIZE |
# define INIT_THREAD_SIZE 2048*sizeof(long) |
#endif |
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union thread_union { |
struct thread_info thread_info; |
unsigned long stack[INIT_THREAD_SIZE/sizeof(long)]; |
}; |
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#ifndef __HAVE_ARCH_KSTACK_END |
static inline int kstack_end(void *addr) |
{ |
/* Reliable end of stack detection: |
* Some APM bios versions misalign the stack |
*/ |
return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); |
} |
#endif |
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extern union thread_union init_thread_union; |
extern struct task_struct init_task; |
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extern struct mm_struct init_mm; |
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extern struct task_struct *find_task_by_pid(int pid); |
extern void set_special_pids(pid_t session, pid_t pgrp); |
extern void __set_special_pids(pid_t session, pid_t pgrp); |
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/* per-UID process charging. */ |
extern struct user_struct * alloc_uid(uid_t); |
extern void free_uid(struct user_struct *); |
extern void switch_uid(struct user_struct *); |
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#include <asm/current.h> |
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extern unsigned long itimer_ticks; |
extern unsigned long itimer_next; |
extern void do_timer(struct pt_regs *); |
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extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state)); |
extern int FASTCALL(wake_up_process(struct task_struct * tsk)); |
#ifdef CONFIG_SMP |
extern void FASTCALL(kick_process(struct task_struct * tsk)); |
#else |
static inline void kick_process(struct task_struct *tsk) { } |
#endif |
extern void FASTCALL(wake_up_forked_process(struct task_struct * tsk)); |
extern void FASTCALL(sched_exit(task_t * p)); |
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asmlinkage long sys_wait4(pid_t pid,unsigned int * stat_addr, int options, struct rusage * ru); |
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extern int in_group_p(gid_t); |
extern int in_egroup_p(gid_t); |
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extern void proc_caches_init(void); |
extern void flush_signals(struct task_struct *); |
extern void flush_signal_handlers(struct task_struct *, int force_default); |
extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); |
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static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) |
{ |
unsigned long flags; |
int ret; |
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spin_lock_irqsave(&tsk->sighand->siglock, flags); |
ret = dequeue_signal(tsk, mask, info); |
spin_unlock_irqrestore(&tsk->sighand->siglock, flags); |
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return ret; |
} |
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extern void block_all_signals(int (*notifier)(void *priv), void *priv, |
sigset_t *mask); |
extern void unblock_all_signals(void); |
extern void release_task(struct task_struct * p); |
extern int send_sig_info(int, struct siginfo *, struct task_struct *); |
extern int send_group_sig_info(int, struct siginfo *, struct task_struct *); |
extern int force_sig_info(int, struct siginfo *, struct task_struct *); |
extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp); |
extern int kill_pg_info(int, struct siginfo *, pid_t); |
extern int kill_sl_info(int, struct siginfo *, pid_t); |
extern int kill_proc_info(int, struct siginfo *, pid_t); |
extern void notify_parent(struct task_struct *, int); |
extern void do_notify_parent(struct task_struct *, int); |
extern void force_sig(int, struct task_struct *); |
extern void force_sig_specific(int, struct task_struct *); |
extern int send_sig(int, struct task_struct *, int); |
extern void zap_other_threads(struct task_struct *p); |
extern int kill_pg(pid_t, int, int); |
extern int kill_sl(pid_t, int, int); |
extern int kill_proc(pid_t, int, int); |
extern struct sigqueue *sigqueue_alloc(void); |
extern void sigqueue_free(struct sigqueue *); |
extern int send_sigqueue(int, struct sigqueue *, struct task_struct *); |
extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *); |
extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *); |
extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); |
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/* These can be the second arg to send_sig_info/send_group_sig_info. */ |
#define SEND_SIG_NOINFO ((struct siginfo *) 0) |
#define SEND_SIG_PRIV ((struct siginfo *) 1) |
#define SEND_SIG_FORCED ((struct siginfo *) 2) |
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/* True if we are on the alternate signal stack. */ |
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static inline int on_sig_stack(unsigned long sp) |
{ |
return (sp - current->sas_ss_sp < current->sas_ss_size); |
} |
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static inline int sas_ss_flags(unsigned long sp) |
{ |
return (current->sas_ss_size == 0 ? SS_DISABLE |
: on_sig_stack(sp) ? SS_ONSTACK : 0); |
} |
|
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#ifdef CONFIG_SECURITY |
/* code is in security.c */ |
extern int capable(int cap); |
#else |
static inline int capable(int cap) |
{ |
if (cap_raised(current->cap_effective, cap)) { |
current->flags |= PF_SUPERPRIV; |
return 1; |
} |
return 0; |
} |
#endif |
|
/* |
* Routines for handling mm_structs |
*/ |
extern struct mm_struct * mm_alloc(void); |
|
/* mmdrop drops the mm and the page tables */ |
extern inline void FASTCALL(__mmdrop(struct mm_struct *)); |
static inline void mmdrop(struct mm_struct * mm) |
{ |
if (atomic_dec_and_test(&mm->mm_count)) |
__mmdrop(mm); |
} |
|
/* mmput gets rid of the mappings and all user-space */ |
extern void mmput(struct mm_struct *); |
/* Grab a reference to the mm if its not already going away */ |
extern struct mm_struct *mmgrab(struct mm_struct *); |
/* Remove the current tasks stale references to the old mm_struct */ |
extern void mm_release(struct task_struct *, struct mm_struct *); |
|
extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); |
extern void flush_thread(void); |
extern void exit_thread(void); |
|
extern void exit_mm(struct task_struct *); |
extern void exit_files(struct task_struct *); |
extern void exit_signal(struct task_struct *); |
extern void __exit_signal(struct task_struct *); |
extern void exit_sighand(struct task_struct *); |
extern void __exit_sighand(struct task_struct *); |
extern void exit_itimers(struct task_struct *); |
|
extern NORET_TYPE void do_group_exit(int); |
|
extern void reparent_to_init(void); |
extern void daemonize(const char *, ...); |
extern int allow_signal(int); |
extern int disallow_signal(int); |
extern task_t *child_reaper; |
|
extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); |
extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); |
extern struct task_struct * copy_process(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); |
|
#ifdef CONFIG_SMP |
extern void wait_task_inactive(task_t * p); |
#else |
#define wait_task_inactive(p) do { } while (0) |
#endif |
|
#define remove_parent(p) list_del_init(&(p)->sibling) |
#define add_parent(p, parent) list_add_tail(&(p)->sibling,&(parent)->children) |
|
#define REMOVE_LINKS(p) do { \ |
if (thread_group_leader(p)) \ |
list_del_init(&(p)->tasks); \ |
remove_parent(p); \ |
} while (0) |
|
#define SET_LINKS(p) do { \ |
if (thread_group_leader(p)) \ |
list_add_tail(&(p)->tasks,&init_task.tasks); \ |
add_parent(p, (p)->parent); \ |
} while (0) |
|
#define next_task(p) list_entry((p)->tasks.next, struct task_struct, tasks) |
#define prev_task(p) list_entry((p)->tasks.prev, struct task_struct, tasks) |
|
#define for_each_process(p) \ |
for (p = &init_task ; (p = next_task(p)) != &init_task ; ) |
|
/* |
* Careful: do_each_thread/while_each_thread is a double loop so |
* 'break' will not work as expected - use goto instead. |
*/ |
#define do_each_thread(g, t) \ |
for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do |
|
#define while_each_thread(g, t) \ |
while ((t = next_thread(t)) != g) |
|
extern task_t * FASTCALL(next_thread(task_t *p)); |
|
#define thread_group_leader(p) (p->pid == p->tgid) |
|
static inline int thread_group_empty(task_t *p) |
{ |
struct pid *pid = p->pids[PIDTYPE_TGID].pidptr; |
|
return pid->task_list.next->next == &pid->task_list; |
} |
|
#define delay_group_leader(p) \ |
(thread_group_leader(p) && !thread_group_empty(p)) |
|
extern void unhash_process(struct task_struct *p); |
|
/* Protects ->fs, ->files, ->mm, and synchronises with wait4(). |
* Nests both inside and outside of read_lock(&tasklist_lock). |
* It must not be nested with write_lock_irq(&tasklist_lock), |
* neither inside nor outside. |
*/ |
static inline void task_lock(struct task_struct *p) |
{ |
spin_lock(&p->alloc_lock); |
} |
|
static inline void task_unlock(struct task_struct *p) |
{ |
spin_unlock(&p->alloc_lock); |
} |
|
/** |
* get_task_mm - acquire a reference to the task's mm |
* |
* Returns %NULL if the task has no mm. User must release |
* the mm via mmput() after use. |
*/ |
static inline struct mm_struct * get_task_mm(struct task_struct * task) |
{ |
struct mm_struct * mm; |
|
task_lock(task); |
mm = task->mm; |
if (mm) |
mm = mmgrab(mm); |
task_unlock(task); |
|
return mm; |
} |
|
|
/* set thread flags in other task's structures |
* - see asm/thread_info.h for TIF_xxxx flags available |
*/ |
static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) |
{ |
set_ti_thread_flag(tsk->thread_info,flag); |
} |
|
static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) |
{ |
clear_ti_thread_flag(tsk->thread_info,flag); |
} |
|
static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) |
{ |
return test_and_set_ti_thread_flag(tsk->thread_info,flag); |
} |
|
static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) |
{ |
return test_and_clear_ti_thread_flag(tsk->thread_info,flag); |
} |
|
static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) |
{ |
return test_ti_thread_flag(tsk->thread_info,flag); |
} |
|
static inline void set_tsk_need_resched(struct task_struct *tsk) |
{ |
set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); |
} |
|
static inline void clear_tsk_need_resched(struct task_struct *tsk) |
{ |
clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); |
} |
|
static inline int signal_pending(struct task_struct *p) |
{ |
return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); |
} |
|
static inline int need_resched(void) |
{ |
return unlikely(test_thread_flag(TIF_NEED_RESCHED)); |
} |
|
extern void __cond_resched(void); |
static inline void cond_resched(void) |
{ |
if (need_resched()) |
__cond_resched(); |
} |
|
/* |
* cond_resched_lock() - if a reschedule is pending, drop the given lock, |
* call schedule, and on return reacquire the lock. |
* |
* This works OK both with and without CONFIG_PREEMPT. We do strange low-level |
* operations here to prevent schedule() from being called twice (once via |
* spin_unlock(), once by hand). |
*/ |
static inline void cond_resched_lock(spinlock_t * lock) |
{ |
if (need_resched()) { |
_raw_spin_unlock(lock); |
preempt_enable_no_resched(); |
__cond_resched(); |
spin_lock(lock); |
} |
} |
|
/* Reevaluate whether the task has signals pending delivery. |
This is required every time the blocked sigset_t changes. |
callers must hold sighand->siglock. */ |
|
extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t)); |
extern void recalc_sigpending(void); |
|
extern void signal_wake_up(struct task_struct *t, int resume_stopped); |
|
/* |
* Wrappers for p->thread_info->cpu access. No-op on UP. |
*/ |
#ifdef CONFIG_SMP |
|
static inline unsigned int task_cpu(struct task_struct *p) |
{ |
return p->thread_info->cpu; |
} |
|
static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) |
{ |
p->thread_info->cpu = cpu; |
} |
|
#else |
|
static inline unsigned int task_cpu(struct task_struct *p) |
{ |
return 0; |
} |
|
static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) |
{ |
} |
|
#endif /* CONFIG_SMP */ |
|
#endif /* __KERNEL__ */ |
|
#endif |
#ifndef _LINUX_SCHED_H |
#define _LINUX_SCHED_H |
|
#include <asm/param.h> /* for HZ */ |
|
#include <linux/config.h> |
#include <linux/capability.h> |
#include <linux/threads.h> |
#include <linux/kernel.h> |
#include <linux/types.h> |
#include <linux/timex.h> |
#include <linux/jiffies.h> |
#include <linux/rbtree.h> |
#include <linux/thread_info.h> |
#include <linux/cpumask.h> |
|
#include <asm/system.h> |
#include <asm/semaphore.h> |
#include <asm/page.h> |
#include <asm/ptrace.h> |
#include <asm/mmu.h> |
|
#include <linux/smp.h> |
#include <linux/sem.h> |
#include <linux/signal.h> |
#include <linux/securebits.h> |
#include <linux/fs_struct.h> |
#include <linux/compiler.h> |
#include <linux/completion.h> |
#include <linux/pid.h> |
#include <linux/percpu.h> |
|
struct exec_domain; |
|
/* |
* cloning flags: |
*/ |
#define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ |
#define CLONE_VM 0x00000100 /* set if VM shared between processes */ |
#define CLONE_FS 0x00000200 /* set if fs info shared between processes */ |
#define CLONE_FILES 0x00000400 /* set if open files shared between processes */ |
#define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */ |
#define CLONE_IDLETASK 0x00001000 /* set if new pid should be 0 (kernel only)*/ |
#define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */ |
#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ |
#define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */ |
#define CLONE_THREAD 0x00010000 /* Same thread group? */ |
#define CLONE_NEWNS 0x00020000 /* New namespace group? */ |
#define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */ |
#define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */ |
#define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */ |
#define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */ |
#define CLONE_DETACHED 0x00400000 /* Not used - CLONE_THREAD implies detached uniquely */ |
#define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */ |
#define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */ |
#define CLONE_STOPPED 0x02000000 /* Start in stopped state */ |
|
/* |
* List of flags we want to share for kernel threads, |
* if only because they are not used by them anyway. |
*/ |
#define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) |
|
/* |
* These are the constant used to fake the fixed-point load-average |
* counting. Some notes: |
* - 11 bit fractions expand to 22 bits by the multiplies: this gives |
* a load-average precision of 10 bits integer + 11 bits fractional |
* - if you want to count load-averages more often, you need more |
* precision, or rounding will get you. With 2-second counting freq, |
* the EXP_n values would be 1981, 2034 and 2043 if still using only |
* 11 bit fractions. |
*/ |
extern unsigned long avenrun[]; /* Load averages */ |
|
#define FSHIFT 11 /* nr of bits of precision */ |
#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ |
#define LOAD_FREQ (5*HZ) /* 5 sec intervals */ |
#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ |
#define EXP_5 2014 /* 1/exp(5sec/5min) */ |
#define EXP_15 2037 /* 1/exp(5sec/15min) */ |
|
#define CALC_LOAD(load,exp,n) \ |
load *= exp; \ |
load += n*(FIXED_1-exp); \ |
load >>= FSHIFT; |
|
#define CT_TO_SECS(x) ((x) / HZ) |
#define CT_TO_USECS(x) (((x) % HZ) * 1000000/HZ) |
|
extern int nr_threads; |
extern int last_pid; |
DECLARE_PER_CPU(unsigned long, process_counts); |
extern int nr_processes(void); |
extern unsigned long nr_running(void); |
extern unsigned long nr_uninterruptible(void); |
extern unsigned long nr_iowait(void); |
|
#include <linux/time.h> |
#include <linux/param.h> |
#include <linux/resource.h> |
#include <linux/timer.h> |
|
#include <asm/processor.h> |
|
#define TASK_RUNNING 0 |
#define TASK_INTERRUPTIBLE 1 |
#define TASK_UNINTERRUPTIBLE 2 |
#define TASK_STOPPED 4 |
#define TASK_ZOMBIE 8 |
#define TASK_DEAD 16 |
|
#define __set_task_state(tsk, state_value) \ |
do { (tsk)->state = (state_value); } while (0) |
#define set_task_state(tsk, state_value) \ |
set_mb((tsk)->state, (state_value)) |
|
#define __set_current_state(state_value) \ |
do { current->state = (state_value); } while (0) |
#define set_current_state(state_value) \ |
set_mb(current->state, (state_value)) |
|
/* |
* Scheduling policies |
*/ |
#define SCHED_NORMAL 0 |
#define SCHED_FIFO 1 |
#define SCHED_RR 2 |
|
struct sched_param { |
int sched_priority; |
}; |
|
#ifdef __KERNEL__ |
|
#include <linux/spinlock.h> |
|
/* |
* This serializes "schedule()" and also protects |
* the run-queue from deletions/modifications (but |
* _adding_ to the beginning of the run-queue has |
* a separate lock). |
*/ |
extern rwlock_t tasklist_lock; |
extern spinlock_t mmlist_lock; |
|
typedef struct task_struct task_t; |
|
extern void sched_init(void); |
extern void init_idle(task_t *idle, int cpu); |
|
extern void show_state(void); |
extern void show_regs(struct pt_regs *); |
|
/* |
* TASK is a pointer to the task whose backtrace we want to see (or NULL for current |
* task), SP is the stack pointer of the first frame that should be shown in the back |
* trace (or NULL if the entire call-chain of the task should be shown). |
*/ |
extern void show_stack(struct task_struct *task, unsigned long *sp); |
|
void io_schedule(void); |
long io_schedule_timeout(long timeout); |
|
extern void cpu_init (void); |
extern void trap_init(void); |
extern void update_process_times(int user); |
extern void update_one_process(struct task_struct *p, unsigned long user, |
unsigned long system, int cpu); |
extern void scheduler_tick(int user_tick, int system); |
extern unsigned long cache_decay_ticks; |
|
|
#define MAX_SCHEDULE_TIMEOUT LONG_MAX |
extern signed long FASTCALL(schedule_timeout(signed long timeout)); |
asmlinkage void schedule(void); |
|
struct namespace; |
|
/* Maximum number of active map areas.. This is a random (large) number */ |
#define MAX_MAP_COUNT (65536) |
|
#include <linux/aio.h> |
|
struct mm_struct { |
struct vm_area_struct * mmap; /* list of VMAs */ |
struct rb_root mm_rb; |
struct vm_area_struct * mmap_cache; /* last find_vma result */ |
unsigned long free_area_cache; /* first hole */ |
pgd_t * pgd; |
atomic_t mm_users; /* How many users with user space? */ |
atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ |
int map_count; /* number of VMAs */ |
struct rw_semaphore mmap_sem; |
spinlock_t page_table_lock; /* Protects task page tables and mm->rss */ |
|
struct list_head mmlist; /* List of all active mm's. These are globally strung |
* together off init_mm.mmlist, and are protected |
* by mmlist_lock |
*/ |
|
unsigned long start_code, end_code, start_data, end_data; |
unsigned long start_brk, brk, start_stack; |
unsigned long arg_start, arg_end, env_start, env_end; |
unsigned long rss, total_vm, locked_vm; |
unsigned long def_flags; |
cpumask_t cpu_vm_mask; |
unsigned long swap_address; |
|
unsigned long saved_auxv[40]; /* for /proc/PID/auxv */ |
|
unsigned dumpable:1; |
#ifdef CONFIG_HUGETLB_PAGE |
int used_hugetlb; |
#endif |
/* Architecture-specific MM context */ |
mm_context_t context; |
|
/* coredumping support */ |
int core_waiters; |
struct completion *core_startup_done, core_done; |
|
/* aio bits */ |
rwlock_t ioctx_list_lock; |
struct kioctx *ioctx_list; |
|
struct kioctx default_kioctx; |
}; |
|
extern int mmlist_nr; |
|
struct sighand_struct { |
atomic_t count; |
struct k_sigaction action[_NSIG]; |
spinlock_t siglock; |
}; |
|
/* |
* NOTE! "signal_struct" does not have it's own |
* locking, because a shared signal_struct always |
* implies a shared sighand_struct, so locking |
* sighand_struct is always a proper superset of |
* the locking of signal_struct. |
*/ |
struct signal_struct { |
atomic_t count; |
|
/* current thread group signal load-balancing target: */ |
task_t *curr_target; |
|
/* shared signal handling: */ |
struct sigpending shared_pending; |
|
/* thread group exit support */ |
int group_exit; |
int group_exit_code; |
/* overloaded: |
* - notify group_exit_task when ->count is equal to notify_count |
* - everyone except group_exit_task is stopped during signal delivery |
* of fatal signals, group_exit_task processes the signal. |
*/ |
struct task_struct *group_exit_task; |
int notify_count; |
|
/* thread group stop support, overloads group_exit_code too */ |
int group_stop_count; |
}; |
|
/* |
* Priority of a process goes from 0..MAX_PRIO-1, valid RT |
* priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL tasks are |
* in the range MAX_RT_PRIO..MAX_PRIO-1. Priority values |
* are inverted: lower p->prio value means higher priority. |
* |
* The MAX_RT_USER_PRIO value allows the actual maximum |
* RT priority to be separate from the value exported to |
* user-space. This allows kernel threads to set their |
* priority to a value higher than any user task. Note: |
* MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. |
*/ |
|
#define MAX_USER_RT_PRIO 100 |
#define MAX_RT_PRIO MAX_USER_RT_PRIO |
|
#define MAX_PRIO (MAX_RT_PRIO + 40) |
|
#define rt_task(p) ((p)->prio < MAX_RT_PRIO) |
|
/* |
* Some day this will be a full-fledged user tracking system.. |
*/ |
struct user_struct { |
atomic_t __count; /* reference count */ |
atomic_t processes; /* How many processes does this user have? */ |
atomic_t files; /* How many open files does this user have? */ |
|
/* Hash table maintenance information */ |
struct list_head uidhash_list; |
uid_t uid; |
}; |
|
extern struct user_struct *find_user(uid_t); |
|
extern struct user_struct root_user; |
#define INIT_USER (&root_user) |
|
typedef struct prio_array prio_array_t; |
struct backing_dev_info; |
struct reclaim_state; |
|
/* POSIX.1b interval timer structure. */ |
struct k_itimer { |
struct list_head list; /* free/ allocate list */ |
spinlock_t it_lock; |
clockid_t it_clock; /* which timer type */ |
timer_t it_id; /* timer id */ |
int it_overrun; /* overrun on pending signal */ |
int it_overrun_last; /* overrun on last delivered signal */ |
int it_requeue_pending; /* waiting to requeue this timer */ |
int it_sigev_notify; /* notify word of sigevent struct */ |
int it_sigev_signo; /* signo word of sigevent struct */ |
sigval_t it_sigev_value; /* value word of sigevent struct */ |
unsigned long it_incr; /* interval specified in jiffies */ |
struct task_struct *it_process; /* process to send signal to */ |
struct timer_list it_timer; |
struct sigqueue *sigq; /* signal queue entry. */ |
}; |
|
|
struct io_context; /* See blkdev.h */ |
void exit_io_context(void); |
|
struct task_struct { |
volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ |
struct thread_info *thread_info; |
atomic_t usage; |
unsigned long flags; /* per process flags, defined below */ |
unsigned long ptrace; |
|
int lock_depth; /* Lock depth */ |
|
int prio, static_prio; |
struct list_head run_list; |
prio_array_t *array; |
|
unsigned long sleep_avg; |
long interactive_credit; |
unsigned long long timestamp; |
int activated; |
|
unsigned long policy; |
cpumask_t cpus_allowed; |
unsigned int time_slice, first_time_slice; |
|
struct list_head tasks; |
struct list_head ptrace_children; |
struct list_head ptrace_list; |
|
struct mm_struct *mm, *active_mm; |
|
/* task state */ |
struct linux_binfmt *binfmt; |
int exit_code, exit_signal; |
int pdeath_signal; /* The signal sent when the parent dies */ |
/* ??? */ |
unsigned long personality; |
int did_exec:1; |
pid_t pid; |
pid_t __pgrp; /* Accessed via process_group() */ |
pid_t tty_old_pgrp; |
pid_t session; |
pid_t tgid; |
/* boolean value for session group leader */ |
int leader; |
/* |
* pointers to (original) parent process, youngest child, younger sibling, |
* older sibling, respectively. (p->father can be replaced with |
* p->parent->pid) |
*/ |
struct task_struct *real_parent; /* real parent process (when being debugged) */ |
struct task_struct *parent; /* parent process */ |
struct list_head children; /* list of my children */ |
struct list_head sibling; /* linkage in my parent's children list */ |
struct task_struct *group_leader; /* threadgroup leader */ |
|
/* PID/PID hash table linkage. */ |
struct pid_link pids[PIDTYPE_MAX]; |
|
wait_queue_head_t wait_chldexit; /* for wait4() */ |
struct completion *vfork_done; /* for vfork() */ |
int __user *set_child_tid; /* CLONE_CHILD_SETTID */ |
int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ |
|
unsigned long rt_priority; |
unsigned long it_real_value, it_prof_value, it_virt_value; |
unsigned long it_real_incr, it_prof_incr, it_virt_incr; |
struct timer_list real_timer; |
struct list_head posix_timers; /* POSIX.1b Interval Timers */ |
unsigned long utime, stime, cutime, cstime; |
unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; /* context switch counts */ |
u64 start_time; |
/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
unsigned long min_flt, maj_flt, nswap, cmin_flt, cmaj_flt, cnswap; |
/* process credentials */ |
uid_t uid,euid,suid,fsuid; |
gid_t gid,egid,sgid,fsgid; |
int ngroups; |
gid_t groups[NGROUPS]; |
kernel_cap_t cap_effective, cap_inheritable, cap_permitted; |
int keep_capabilities:1; |
struct user_struct *user; |
/* limits */ |
struct rlimit rlim[RLIM_NLIMITS]; |
unsigned short used_math; |
char comm[16]; |
/* file system info */ |
int link_count, total_link_count; |
struct tty_struct *tty; /* NULL if no tty */ |
/* ipc stuff */ |
struct sysv_sem sysvsem; |
/* CPU-specific state of this task */ |
struct thread_struct thread; |
/* filesystem information */ |
struct fs_struct *fs; |
/* open file information */ |
struct files_struct *files; |
/* namespace */ |
struct namespace *namespace; |
/* signal handlers */ |
struct signal_struct *signal; |
struct sighand_struct *sighand; |
|
sigset_t blocked, real_blocked; |
struct sigpending pending; |
|
unsigned long sas_ss_sp; |
size_t sas_ss_size; |
int (*notifier)(void *priv); |
void *notifier_data; |
sigset_t *notifier_mask; |
|
void *security; |
|
/* Thread group tracking */ |
u32 parent_exec_id; |
u32 self_exec_id; |
/* Protection of (de-)allocation: mm, files, fs, tty */ |
spinlock_t alloc_lock; |
/* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */ |
spinlock_t proc_lock; |
/* context-switch lock */ |
spinlock_t switch_lock; |
|
/* journalling filesystem info */ |
void *journal_info; |
|
/* VM state */ |
struct reclaim_state *reclaim_state; |
|
struct dentry *proc_dentry; |
struct backing_dev_info *backing_dev_info; |
|
struct io_context *io_context; |
|
unsigned long ptrace_message; |
siginfo_t *last_siginfo; /* For ptrace use. */ |
}; |
|
static inline pid_t process_group(struct task_struct *tsk) |
{ |
return tsk->group_leader->__pgrp; |
} |
|
extern void __put_task_struct(struct task_struct *tsk); |
#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
#define put_task_struct(tsk) \ |
do { if (atomic_dec_and_test(&(tsk)->usage)) __put_task_struct(tsk); } while(0) |
|
/* |
* Per process flags |
*/ |
#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ |
/* Not implemented yet, only for 486*/ |
#define PF_STARTING 0x00000002 /* being created */ |
#define PF_EXITING 0x00000004 /* getting shut down */ |
#define PF_DEAD 0x00000008 /* Dead */ |
#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ |
#define PF_DUMPCORE 0x00000200 /* dumped core */ |
#define PF_SIGNALED 0x00000400 /* killed by a signal */ |
#define PF_MEMALLOC 0x00000800 /* Allocating memory */ |
#define PF_MEMDIE 0x00001000 /* Killed for out-of-memory */ |
#define PF_FLUSHER 0x00002000 /* responsible for disk writeback */ |
|
#define PF_FREEZE 0x00004000 /* this task should be frozen for suspend */ |
#define PF_IOTHREAD 0x00008000 /* this thread is needed for doing I/O to swap */ |
#define PF_FROZEN 0x00010000 /* frozen for system suspend */ |
#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ |
#define PF_KSWAPD 0x00040000 /* I am kswapd */ |
#define PF_SWAPOFF 0x00080000 /* I am in swapoff */ |
#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
#define PF_SYNCWRITE 0x00200000 /* I am doing a sync write */ |
|
#ifdef CONFIG_SMP |
extern int set_cpus_allowed(task_t *p, cpumask_t new_mask); |
#else |
static inline int set_cpus_allowed(task_t *p, cpumask_t new_mask) |
{ |
return 0; |
} |
#endif |
|
extern unsigned long long sched_clock(void); |
|
#ifdef CONFIG_NUMA |
extern void sched_balance_exec(void); |
extern void node_nr_running_init(void); |
#else |
#define sched_balance_exec() {} |
#define node_nr_running_init() {} |
#endif |
|
extern void set_user_nice(task_t *p, long nice); |
extern int task_prio(task_t *p); |
extern int task_nice(task_t *p); |
extern int task_curr(task_t *p); |
extern int idle_cpu(int cpu); |
|
void yield(void); |
|
/* |
* The default (Linux) execution domain. |
*/ |
extern struct exec_domain default_exec_domain; |
|
#ifndef INIT_THREAD_SIZE |
# define INIT_THREAD_SIZE 2048*sizeof(long) |
#endif |
|
union thread_union { |
struct thread_info thread_info; |
unsigned long stack[INIT_THREAD_SIZE/sizeof(long)]; |
}; |
|
#ifndef __HAVE_ARCH_KSTACK_END |
static inline int kstack_end(void *addr) |
{ |
/* Reliable end of stack detection: |
* Some APM bios versions misalign the stack |
*/ |
return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); |
} |
#endif |
|
extern union thread_union init_thread_union; |
extern struct task_struct init_task; |
|
extern struct mm_struct init_mm; |
|
extern struct task_struct *find_task_by_pid(int pid); |
extern void set_special_pids(pid_t session, pid_t pgrp); |
extern void __set_special_pids(pid_t session, pid_t pgrp); |
|
/* per-UID process charging. */ |
extern struct user_struct * alloc_uid(uid_t); |
extern void free_uid(struct user_struct *); |
extern void switch_uid(struct user_struct *); |
|
#include <asm/current.h> |
|
extern unsigned long itimer_ticks; |
extern unsigned long itimer_next; |
extern void do_timer(struct pt_regs *); |
|
extern int FASTCALL(wake_up_state(struct task_struct * tsk, unsigned int state)); |
extern int FASTCALL(wake_up_process(struct task_struct * tsk)); |
#ifdef CONFIG_SMP |
extern void FASTCALL(kick_process(struct task_struct * tsk)); |
#else |
static inline void kick_process(struct task_struct *tsk) { } |
#endif |
extern void FASTCALL(wake_up_forked_process(struct task_struct * tsk)); |
extern void FASTCALL(sched_exit(task_t * p)); |
|
asmlinkage long sys_wait4(pid_t pid,unsigned int * stat_addr, int options, struct rusage * ru); |
|
extern int in_group_p(gid_t); |
extern int in_egroup_p(gid_t); |
|
extern void proc_caches_init(void); |
extern void flush_signals(struct task_struct *); |
extern void flush_signal_handlers(struct task_struct *, int force_default); |
extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); |
|
static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) |
{ |
unsigned long flags; |
int ret; |
|
spin_lock_irqsave(&tsk->sighand->siglock, flags); |
ret = dequeue_signal(tsk, mask, info); |
spin_unlock_irqrestore(&tsk->sighand->siglock, flags); |
|
return ret; |
} |
|
extern void block_all_signals(int (*notifier)(void *priv), void *priv, |
sigset_t *mask); |
extern void unblock_all_signals(void); |
extern void release_task(struct task_struct * p); |
extern int send_sig_info(int, struct siginfo *, struct task_struct *); |
extern int send_group_sig_info(int, struct siginfo *, struct task_struct *); |
extern int force_sig_info(int, struct siginfo *, struct task_struct *); |
extern int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp); |
extern int kill_pg_info(int, struct siginfo *, pid_t); |
extern int kill_sl_info(int, struct siginfo *, pid_t); |
extern int kill_proc_info(int, struct siginfo *, pid_t); |
extern void notify_parent(struct task_struct *, int); |
extern void do_notify_parent(struct task_struct *, int); |
extern void force_sig(int, struct task_struct *); |
extern void force_sig_specific(int, struct task_struct *); |
extern int send_sig(int, struct task_struct *, int); |
extern void zap_other_threads(struct task_struct *p); |
extern int kill_pg(pid_t, int, int); |
extern int kill_sl(pid_t, int, int); |
extern int kill_proc(pid_t, int, int); |
extern struct sigqueue *sigqueue_alloc(void); |
extern void sigqueue_free(struct sigqueue *); |
extern int send_sigqueue(int, struct sigqueue *, struct task_struct *); |
extern int send_group_sigqueue(int, struct sigqueue *, struct task_struct *); |
extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *); |
extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); |
|
/* These can be the second arg to send_sig_info/send_group_sig_info. */ |
#define SEND_SIG_NOINFO ((struct siginfo *) 0) |
#define SEND_SIG_PRIV ((struct siginfo *) 1) |
#define SEND_SIG_FORCED ((struct siginfo *) 2) |
|
/* True if we are on the alternate signal stack. */ |
|
static inline int on_sig_stack(unsigned long sp) |
{ |
return (sp - current->sas_ss_sp < current->sas_ss_size); |
} |
|
static inline int sas_ss_flags(unsigned long sp) |
{ |
return (current->sas_ss_size == 0 ? SS_DISABLE |
: on_sig_stack(sp) ? SS_ONSTACK : 0); |
} |
|
|
#ifdef CONFIG_SECURITY |
/* code is in security.c */ |
extern int capable(int cap); |
#else |
static inline int capable(int cap) |
{ |
if (cap_raised(current->cap_effective, cap)) { |
current->flags |= PF_SUPERPRIV; |
return 1; |
} |
return 0; |
} |
#endif |
|
/* |
* Routines for handling mm_structs |
*/ |
extern struct mm_struct * mm_alloc(void); |
|
/* mmdrop drops the mm and the page tables */ |
extern inline void FASTCALL(__mmdrop(struct mm_struct *)); |
static inline void mmdrop(struct mm_struct * mm) |
{ |
if (atomic_dec_and_test(&mm->mm_count)) |
__mmdrop(mm); |
} |
|
/* mmput gets rid of the mappings and all user-space */ |
extern void mmput(struct mm_struct *); |
/* Grab a reference to the mm if its not already going away */ |
extern struct mm_struct *mmgrab(struct mm_struct *); |
/* Remove the current tasks stale references to the old mm_struct */ |
extern void mm_release(struct task_struct *, struct mm_struct *); |
|
extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); |
extern void flush_thread(void); |
extern void exit_thread(void); |
|
extern void exit_mm(struct task_struct *); |
extern void exit_files(struct task_struct *); |
extern void exit_signal(struct task_struct *); |
extern void __exit_signal(struct task_struct *); |
extern void exit_sighand(struct task_struct *); |
extern void __exit_sighand(struct task_struct *); |
extern void exit_itimers(struct task_struct *); |
|
extern NORET_TYPE void do_group_exit(int); |
|
extern void reparent_to_init(void); |
extern void daemonize(const char *, ...); |
extern int allow_signal(int); |
extern int disallow_signal(int); |
extern task_t *child_reaper; |
|
extern int do_execve(char *, char __user * __user *, char __user * __user *, struct pt_regs *); |
extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); |
extern struct task_struct * copy_process(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); |
|
#ifdef CONFIG_SMP |
extern void wait_task_inactive(task_t * p); |
#else |
#define wait_task_inactive(p) do { } while (0) |
#endif |
|
#define remove_parent(p) list_del_init(&(p)->sibling) |
#define add_parent(p, parent) list_add_tail(&(p)->sibling,&(parent)->children) |
|
#define REMOVE_LINKS(p) do { \ |
if (thread_group_leader(p)) \ |
list_del_init(&(p)->tasks); \ |
remove_parent(p); \ |
} while (0) |
|
#define SET_LINKS(p) do { \ |
if (thread_group_leader(p)) \ |
list_add_tail(&(p)->tasks,&init_task.tasks); \ |
add_parent(p, (p)->parent); \ |
} while (0) |
|
#define next_task(p) list_entry((p)->tasks.next, struct task_struct, tasks) |
#define prev_task(p) list_entry((p)->tasks.prev, struct task_struct, tasks) |
|
#define for_each_process(p) \ |
for (p = &init_task ; (p = next_task(p)) != &init_task ; ) |
|
/* |
* Careful: do_each_thread/while_each_thread is a double loop so |
* 'break' will not work as expected - use goto instead. |
*/ |
#define do_each_thread(g, t) \ |
for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do |
|
#define while_each_thread(g, t) \ |
while ((t = next_thread(t)) != g) |
|
extern task_t * FASTCALL(next_thread(task_t *p)); |
|
#define thread_group_leader(p) (p->pid == p->tgid) |
|
static inline int thread_group_empty(task_t *p) |
{ |
struct pid *pid = p->pids[PIDTYPE_TGID].pidptr; |
|
return pid->task_list.next->next == &pid->task_list; |
} |
|
#define delay_group_leader(p) \ |
(thread_group_leader(p) && !thread_group_empty(p)) |
|
extern void unhash_process(struct task_struct *p); |
|
/* Protects ->fs, ->files, ->mm, and synchronises with wait4(). |
* Nests both inside and outside of read_lock(&tasklist_lock). |
* It must not be nested with write_lock_irq(&tasklist_lock), |
* neither inside nor outside. |
*/ |
static inline void task_lock(struct task_struct *p) |
{ |
spin_lock(&p->alloc_lock); |
} |
|
static inline void task_unlock(struct task_struct *p) |
{ |
spin_unlock(&p->alloc_lock); |
} |
|
/** |
* get_task_mm - acquire a reference to the task's mm |
* |
* Returns %NULL if the task has no mm. User must release |
* the mm via mmput() after use. |
*/ |
static inline struct mm_struct * get_task_mm(struct task_struct * task) |
{ |
struct mm_struct * mm; |
|
task_lock(task); |
mm = task->mm; |
if (mm) |
mm = mmgrab(mm); |
task_unlock(task); |
|
return mm; |
} |
|
|
/* set thread flags in other task's structures |
* - see asm/thread_info.h for TIF_xxxx flags available |
*/ |
static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) |
{ |
set_ti_thread_flag(tsk->thread_info,flag); |
} |
|
static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) |
{ |
clear_ti_thread_flag(tsk->thread_info,flag); |
} |
|
static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) |
{ |
return test_and_set_ti_thread_flag(tsk->thread_info,flag); |
} |
|
static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) |
{ |
return test_and_clear_ti_thread_flag(tsk->thread_info,flag); |
} |
|
static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) |
{ |
return test_ti_thread_flag(tsk->thread_info,flag); |
} |
|
static inline void set_tsk_need_resched(struct task_struct *tsk) |
{ |
set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); |
} |
|
static inline void clear_tsk_need_resched(struct task_struct *tsk) |
{ |
clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); |
} |
|
static inline int signal_pending(struct task_struct *p) |
{ |
return 0; //**unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); |
} |
|
static inline int need_resched(void) |
{ |
return unlikely(test_thread_flag(TIF_NEED_RESCHED)); |
} |
|
extern void __cond_resched(void); |
static inline void cond_resched(void) |
{ |
if (need_resched()) |
__cond_resched(); |
} |
|
/* |
* cond_resched_lock() - if a reschedule is pending, drop the given lock, |
* call schedule, and on return reacquire the lock. |
* |
* This works OK both with and without CONFIG_PREEMPT. We do strange low-level |
* operations here to prevent schedule() from being called twice (once via |
* spin_unlock(), once by hand). |
*/ |
static inline void cond_resched_lock(spinlock_t * lock) |
{ |
if (need_resched()) { |
_raw_spin_unlock(lock); |
preempt_enable_no_resched(); |
__cond_resched(); |
spin_lock(lock); |
} |
} |
|
/* Reevaluate whether the task has signals pending delivery. |
This is required every time the blocked sigset_t changes. |
callers must hold sighand->siglock. */ |
|
extern FASTCALL(void recalc_sigpending_tsk(struct task_struct *t)); |
extern void recalc_sigpending(void); |
|
extern void signal_wake_up(struct task_struct *t, int resume_stopped); |
|
/* |
* Wrappers for p->thread_info->cpu access. No-op on UP. |
*/ |
#ifdef CONFIG_SMP |
|
static inline unsigned int task_cpu(struct task_struct *p) |
{ |
return p->thread_info->cpu; |
} |
|
static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) |
{ |
p->thread_info->cpu = cpu; |
} |
|
#else |
|
static inline unsigned int task_cpu(struct task_struct *p) |
{ |
return 0; |
} |
|
static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) |
{ |
} |
|
#endif /* CONFIG_SMP */ |
|
#endif /* __KERNEL__ */ |
|
#endif |