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Diffstat (limited to 'include/linux/sched.h')
| -rw-r--r-- | include/linux/sched.h | 1273 |
1 files changed, 1273 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h new file mode 100644 index 00000000000..a30e91f40da --- /dev/null +++ b/include/linux/sched.h @@ -0,0 +1,1273 @@ +#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 <linux/errno.h> +#include <linux/nodemask.h> + +#include <asm/system.h> +#include <asm/semaphore.h> +#include <asm/page.h> +#include <asm/ptrace.h> +#include <asm/mmu.h> +#include <asm/cputime.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> +#include <linux/topology.h> +#include <linux/seccomp.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_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 /* Unused, ignored */ +#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; + +extern unsigned long total_forks; +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_TRACED 8 +#define EXIT_ZOMBIE 16 +#define EXIT_DEAD 32 + +#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)) + +/* Task command name length */ +#define TASK_COMM_LEN 16 + +/* + * 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 sched_init_smp(void); +extern void init_idle(task_t *idle, int cpu); + +extern cpumask_t nohz_cpu_mask; + +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 scheduler_tick(void); + +/* Attach to any functions which should be ignored in wchan output. */ +#define __sched __attribute__((__section__(".sched.text"))) +/* Is this address in the __sched functions? */ +extern int in_sched_functions(unsigned long addr); + +#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 DEFAULT_MAX_MAP_COUNT 65536 + +extern int sysctl_max_map_count; + +#include <linux/aio.h> + +extern unsigned long +arch_get_unmapped_area(struct file *, unsigned long, unsigned long, + unsigned long, unsigned long); +extern unsigned long +arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, + unsigned long len, unsigned long pgoff, + unsigned long flags); +extern void arch_unmap_area(struct vm_area_struct *area); +extern void arch_unmap_area_topdown(struct vm_area_struct *area); + +#define set_mm_counter(mm, member, value) (mm)->_##member = (value) +#define get_mm_counter(mm, member) ((mm)->_##member) +#define add_mm_counter(mm, member, value) (mm)->_##member += (value) +#define inc_mm_counter(mm, member) (mm)->_##member++ +#define dec_mm_counter(mm, member) (mm)->_##member-- +typedef unsigned long mm_counter_t; + +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 (*get_unmapped_area) (struct file *filp, + unsigned long addr, unsigned long len, + unsigned long pgoff, unsigned long flags); + void (*unmap_area) (struct vm_area_struct *area); + unsigned long mmap_base; /* base of mmap area */ + 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 page tables and some counters */ + + struct list_head mmlist; /* List of maybe swapped 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 total_vm, locked_vm, shared_vm; + unsigned long exec_vm, stack_vm, reserved_vm, def_flags, nr_ptes; + + /* Special counters protected by the page_table_lock */ + mm_counter_t _rss; + mm_counter_t _anon_rss; + + unsigned long saved_auxv[42]; /* for /proc/PID/auxv */ + + unsigned dumpable:1; + cpumask_t cpu_vm_mask; + + /* Architecture-specific MM context */ + mm_context_t context; + + /* Token based thrashing protection. */ + unsigned long swap_token_time; + char recent_pagein; + + /* 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; + + unsigned long hiwater_rss; /* High-water RSS usage */ + unsigned long hiwater_vm; /* High-water virtual memory usage */ +}; + +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; + atomic_t live; + + wait_queue_head_t wait_chldexit; /* for wait4() */ + + /* 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_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; + unsigned int flags; /* see SIGNAL_* flags below */ + + /* POSIX.1b Interval Timers */ + struct list_head posix_timers; + + /* ITIMER_REAL timer for the process */ + struct timer_list real_timer; + unsigned long it_real_value, it_real_incr; + + /* ITIMER_PROF and ITIMER_VIRTUAL timers for the process */ + cputime_t it_prof_expires, it_virt_expires; + cputime_t it_prof_incr, it_virt_incr; + + /* job control IDs */ + pid_t pgrp; + pid_t tty_old_pgrp; + pid_t session; + /* boolean value for session group leader */ + int leader; + + struct tty_struct *tty; /* NULL if no tty */ + + /* + * Cumulative resource counters for dead threads in the group, + * and for reaped dead child processes forked by this group. + * Live threads maintain their own counters and add to these + * in __exit_signal, except for the group leader. + */ + cputime_t utime, stime, cutime, cstime; + unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; + unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; + + /* + * Cumulative ns of scheduled CPU time for dead threads in the + * group, not including a zombie group leader. (This only differs + * from jiffies_to_ns(utime + stime) if sched_clock uses something + * other than jiffies.) + */ + unsigned long long sched_time; + + /* + * We don't bother to synchronize most readers of this at all, + * because there is no reader checking a limit that actually needs + * to get both rlim_cur and rlim_max atomically, and either one + * alone is a single word that can safely be read normally. + * getrlimit/setrlimit use task_lock(current->group_leader) to + * protect this instead of the siglock, because they really + * have no need to disable irqs. + */ + struct rlimit rlim[RLIM_NLIMITS]; + + struct list_head cpu_timers[3]; + + /* keep the process-shared keyrings here so that they do the right + * thing in threads created with CLONE_THREAD */ +#ifdef CONFIG_KEYS + struct key *session_keyring; /* keyring inherited over fork */ + struct key *process_keyring; /* keyring private to this process */ +#endif +}; + +/* + * Bits in flags field of signal_struct. + */ +#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ +#define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ +#define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ +#define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ + + +/* + * 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_USER_RT_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) (unlikely((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? */ + atomic_t sigpending; /* How many pending signals does this user have? */ + /* protected by mq_lock */ + unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ + unsigned long locked_shm; /* How many pages of mlocked shm ? */ + +#ifdef CONFIG_KEYS + struct key *uid_keyring; /* UID specific keyring */ + struct key *session_keyring; /* UID's default session keyring */ +#endif + + /* 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; + +#ifdef CONFIG_SCHEDSTATS +struct sched_info { + /* cumulative counters */ + unsigned long cpu_time, /* time spent on the cpu */ + run_delay, /* time spent waiting on a runqueue */ + pcnt; /* # of timeslices run on this cpu */ + + /* timestamps */ + unsigned long last_arrival, /* when we last ran on a cpu */ + last_queued; /* when we were last queued to run */ +}; + +extern struct file_operations proc_schedstat_operations; +#endif + +enum idle_type +{ + SCHED_IDLE, + NOT_IDLE, + NEWLY_IDLE, + MAX_IDLE_TYPES +}; + +/* + * sched-domains (multiprocessor balancing) declarations: + */ +#ifdef CONFIG_SMP +#define SCHED_LOAD_SCALE 128UL /* increase resolution of load */ + +#define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ +#define SD_BALANCE_NEWIDLE 2 /* Balance when about to become idle */ +#define SD_BALANCE_EXEC 4 /* Balance on exec */ +#define SD_WAKE_IDLE 8 /* Wake to idle CPU on task wakeup */ +#define SD_WAKE_AFFINE 16 /* Wake task to waking CPU */ +#define SD_WAKE_BALANCE 32 /* Perform balancing at task wakeup */ +#define SD_SHARE_CPUPOWER 64 /* Domain members share cpu power */ + +struct sched_group { + struct sched_group *next; /* Must be a circular list */ + cpumask_t cpumask; + + /* + * CPU power of this group, SCHED_LOAD_SCALE being max power for a + * single CPU. This is read only (except for setup, hotplug CPU). + */ + unsigned long cpu_power; +}; + +struct sched_domain { + /* These fields must be setup */ + struct sched_domain *parent; /* top domain must be null terminated */ + struct sched_group *groups; /* the balancing groups of the domain */ + cpumask_t span; /* span of all CPUs in this domain */ + unsigned long min_interval; /* Minimum balance interval ms */ + unsigned long max_interval; /* Maximum balance interval ms */ + unsigned int busy_factor; /* less balancing by factor if busy */ + unsigned int imbalance_pct; /* No balance until over watermark */ + unsigned long long cache_hot_time; /* Task considered cache hot (ns) */ + unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ + unsigned int per_cpu_gain; /* CPU % gained by adding domain cpus */ + int flags; /* See SD_* */ + + /* Runtime fields. */ + unsigned long last_balance; /* init to jiffies. units in jiffies */ + unsigned int balance_interval; /* initialise to 1. units in ms. */ + unsigned int nr_balance_failed; /* initialise to 0 */ + +#ifdef CONFIG_SCHEDSTATS + /* load_balance() stats */ + unsigned long lb_cnt[MAX_IDLE_TYPES]; + unsigned long lb_failed[MAX_IDLE_TYPES]; + unsigned long lb_balanced[MAX_IDLE_TYPES]; + unsigned long lb_imbalance[MAX_IDLE_TYPES]; + unsigned long lb_gained[MAX_IDLE_TYPES]; + unsigned long lb_hot_gained[MAX_IDLE_TYPES]; + unsigned long lb_nobusyg[MAX_IDLE_TYPES]; + unsigned long lb_nobusyq[MAX_IDLE_TYPES]; + + /* Active load balancing */ + unsigned long alb_cnt; + unsigned long alb_failed; + unsigned long alb_pushed; + + /* sched_balance_exec() stats */ + unsigned long sbe_attempts; + unsigned long sbe_pushed; + + /* try_to_wake_up() stats */ + unsigned long ttwu_wake_remote; + unsigned long ttwu_move_affine; + unsigned long ttwu_move_balance; +#endif +}; + +#ifdef ARCH_HAS_SCHED_DOMAIN +/* Useful helpers that arch setup code may use. Defined in kernel/sched.c */ +extern cpumask_t cpu_isolated_map; +extern void init_sched_build_groups(struct sched_group groups[], + cpumask_t span, int (*group_fn)(int cpu)); +extern void cpu_attach_domain(struct sched_domain *sd, int cpu); +#endif /* ARCH_HAS_SCHED_DOMAIN */ +#endif /* CONFIG_SMP */ + + +struct io_context; /* See blkdev.h */ +void exit_io_context(void); +struct cpuset; + +#define NGROUPS_SMALL 32 +#define NGROUPS_PER_BLOCK ((int)(PAGE_SIZE / sizeof(gid_t))) +struct group_info { + int ngroups; + atomic_t usage; + gid_t small_block[NGROUPS_SMALL]; + int nblocks; + gid_t *blocks[0]; +}; + +/* + * get_group_info() must be called with the owning task locked (via task_lock()) + * when task != current. The reason being that the vast majority of callers are + * looking at current->group_info, which can not be changed except by the + * current task. Changing current->group_info requires the task lock, too. + */ +#define get_group_info(group_info) do { \ + atomic_inc(&(group_info)->usage); \ +} while (0) + +#define put_group_info(group_info) do { \ + if (atomic_dec_and_test(&(group_info)->usage)) \ + groups_free(group_info); \ +} while (0) + +struct group_info *groups_alloc(int gidsetsize); +void groups_free(struct group_info *group_info); +int set_current_groups(struct group_info *group_info); +/* access the groups "array" with this macro */ +#define GROUP_AT(gi, i) \ + ((gi)->blocks[(i)/NGROUPS_PER_BLOCK][(i)%NGROUPS_PER_BLOCK]) + + +struct audit_context; /* See audit.c */ +struct mempolicy; + +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; + unsigned long long timestamp, last_ran; + unsigned long long sched_time; /* sched_clock time spent running */ + int activated; + + unsigned long policy; + cpumask_t cpus_allowed; + unsigned int time_slice, first_time_slice; + +#ifdef CONFIG_SCHEDSTATS + struct sched_info sched_info; +#endif + + struct list_head tasks; + /* + * ptrace_list/ptrace_children forms the list of my children + * that were stolen by a ptracer. + */ + struct list_head ptrace_children; + struct list_head ptrace_list; + + struct mm_struct *mm, *active_mm; + +/* task state */ + struct linux_binfmt *binfmt; + long exit_state; + int exit_code, exit_signal; + int pdeath_signal; /* The signal sent when the parent dies */ + /* ??? */ + unsigned long personality; + unsigned did_exec:1; + pid_t pid; + pid_t tgid; + /* + * 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 */ + /* + * children/sibling forms the list of my children plus the + * tasks I'm ptracing. + */ + 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 pids[PIDTYPE_MAX]; + + 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; + cputime_t utime, stime; + unsigned long nvcsw, nivcsw; /* context switch counts */ + struct timespec 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; + + cputime_t it_prof_expires, it_virt_expires; + unsigned long long it_sched_expires; + struct list_head cpu_timers[3]; + +/* process credentials */ + uid_t uid,euid,suid,fsuid; + gid_t gid,egid,sgid,fsgid; + struct group_info *group_info; + kernel_cap_t cap_effective, cap_inheritable, cap_permitted; + unsigned keep_capabilities:1; + struct user_struct *user; +#ifdef CONFIG_KEYS + struct key *thread_keyring; /* keyring private to this thread */ +#endif + int oomkilladj; /* OOM kill score adjustment (bit shift). */ + char comm[TASK_COMM_LEN]; +/* file system info */ + int link_count, total_link_count; +/* 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; + struct audit_context *audit_context; + seccomp_t seccomp; + +/* Thread group tracking */ + u32 parent_exec_id; + u32 self_exec_id; +/* Protection of (de-)allocation: mm, files, fs, tty, keyrings */ + 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. */ +/* + * current io wait handle: wait queue entry to use for io waits + * If this thread is processing aio, this points at the waitqueue + * inside the currently handled kiocb. It may be NULL (i.e. default + * to a stack based synchronous wait) if its doing sync IO. + */ + wait_queue_t *io_wait; +/* i/o counters(bytes read/written, #syscalls */ + u64 rchar, wchar, syscr, syscw; +#if defined(CONFIG_BSD_PROCESS_ACCT) + u64 acct_rss_mem1; /* accumulated rss usage */ + u64 acct_vm_mem1; /* accumulated virtual memory usage */ + clock_t acct_stimexpd; /* clock_t-converted stime since last update */ +#endif +#ifdef CONFIG_NUMA + struct mempolicy *mempolicy; + short il_next; +#endif +#ifdef CONFIG_CPUSETS + struct cpuset *cpuset; + nodemask_t mems_allowed; + int cpuset_mems_generation; +#endif +}; + +static inline pid_t process_group(struct task_struct *tsk) +{ + return tsk->signal->pgrp; +} + +/** + * pid_alive - check that a task structure is not stale + * @p: Task structure to be checked. + * + * Test if a process is not yet dead (at most zombie state) + * If pid_alive fails, then pointers within the task structure + * can be stale and must not be dereferenced. + */ +static inline int pid_alive(struct task_struct *p) +{ + return p->pids[PIDTYPE_PID].nr != 0; +} + +extern void free_task(struct task_struct *tsk); +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_FLUSHER 0x00001000 /* responsible for disk writeback */ +#define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ +#define PF_FREEZE 0x00004000 /* this task is being frozen for suspend now */ +#define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ +#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 */ +#define PF_BORROWED_MM 0x00400000 /* I am a kthread doing use_mm */ +#define PF_RANDOMIZE 0x00800000 /* randomize virtual address space */ + +/* + * Only the _current_ task can read/write to tsk->flags, but other + * tasks can access tsk->flags in readonly mode for example + * with tsk_used_math (like during threaded core dumping). + * There is however an exception to this rule during ptrace + * or during fork: the ptracer task is allowed to write to the + * child->flags of its traced child (same goes for fork, the parent + * can write to the child->flags), because we're guaranteed the + * child is not running and in turn not changing child->flags + * at the same time the parent does it. + */ +#define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) +#define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) +#define clear_used_math() clear_stopped_child_used_math(current) +#define set_used_math() set_stopped_child_used_math(current) +#define conditional_stopped_child_used_math(condition, child) \ + do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) +#define conditional_used_math(condition) \ + conditional_stopped_child_used_math(condition, current) +#define copy_to_stopped_child_used_math(child) \ + do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) +/* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ +#define tsk_used_math(p) ((p)->flags & PF_USED_MATH) +#define used_math() tsk_used_math(current) + +#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) +{ + if (!cpus_intersects(new_mask, cpu_online_map)) + return -EINVAL; + return 0; +} +#endif + +extern unsigned long long sched_clock(void); +extern unsigned long long current_sched_time(const task_t *current_task); + +/* sched_exec is called by processes performing an exec */ +#ifdef CONFIG_SMP +extern void sched_exec(void); +#else +#define sched_exec() {} +#endif + +#ifdef CONFIG_HOTPLUG_CPU +extern void idle_task_exit(void); +#else +static inline void idle_task_exit(void) {} +#endif + +extern void sched_idle_next(void); +extern void set_user_nice(task_t *p, long nice); +extern int task_prio(const task_t *p); +extern int task_nice(const task_t *p); +extern int task_curr(const task_t *p); +extern int idle_cpu(int cpu); +extern int sched_setscheduler(struct task_struct *, int, struct sched_param *); +extern task_t *idle_task(int cpu); + +void yield(void); + +/* + * The default (Linux) execution domain. + */ +extern struct exec_domain default_exec_domain; + +union thread_union { + struct thread_info thread_info; + unsigned long stack[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; + +#define find_task_by_pid(nr) find_task_by_pid_type(PIDTYPE_PID, nr) +extern struct task_struct *find_task_by_pid_type(int type, 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); +static inline struct user_struct *get_uid(struct user_struct *u) +{ + atomic_inc(&u->__count); + return u; +} +extern void free_uid(struct user_struct *); +extern void switch_uid(struct user_struct *); + +#include <asm/current.h> + +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)); +extern void FASTCALL(wake_up_new_task(struct task_struct * tsk, + unsigned long clone_flags)); +#ifdef CONFIG_SMP + extern void kick_process(struct task_struct *tsk); +#else + static inline void kick_process(struct task_struct *tsk) { } +#endif +extern void FASTCALL(sched_fork(task_t * p)); +extern void FASTCALL(sched_exit(task_t * p)); + +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_sigsegv(int, 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_proc_info(int, struct siginfo *, pid_t); +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 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 a task's mm, if it is not already going away */ +extern struct mm_struct *get_task_mm(struct task_struct *task); +/* 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 signal_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 *); +task_t *fork_idle(int); + +extern void set_task_comm(struct task_struct *tsk, char *from); +extern void get_task_comm(char *to, struct task_struct *tsk); + +#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(const task_t *p)); + +#define thread_group_leader(p) (p->pid == p->tgid) + +static inline int thread_group_empty(task_t *p) +{ + return list_empty(&p->pids[PIDTYPE_TGID].pid_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, ->ptrace, ->group_info, ->comm, keyring + * subscriptions and synchronises with wait4(). Also used in procfs. + * + * 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); +} + +/* 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)); +} + +/* + * cond_resched() and cond_resched_lock(): latency reduction via + * explicit rescheduling in places that are safe. The return + * value indicates whether a reschedule was done in fact. + * cond_resched_lock() will drop the spinlock before scheduling, + * cond_resched_softirq() will enable bhs before scheduling. + */ +extern int cond_resched(void); +extern int cond_resched_lock(spinlock_t * lock); +extern int cond_resched_softirq(void); + +/* + * Does a critical section need to be broken due to another + * task waiting?: + */ +#if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP) +# define need_lockbreak(lock) ((lock)->break_lock) +#else +# define need_lockbreak(lock) 0 +#endif + +/* + * Does a critical section need to be broken due to another + * task waiting or preemption being signalled: + */ +static inline int lock_need_resched(spinlock_t *lock) +{ + if (need_lockbreak(lock) || need_resched()) + return 1; + return 0; +} + +/* 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(const 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(const struct task_struct *p) +{ + return 0; +} + +static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) +{ +} + +#endif /* CONFIG_SMP */ + +#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT +extern void arch_pick_mmap_layout(struct mm_struct *mm); +#else +static inline void arch_pick_mmap_layout(struct mm_struct *mm) +{ + mm->mmap_base = TASK_UNMAPPED_BASE; + mm->get_unmapped_area = arch_get_unmapped_area; + mm->unmap_area = arch_unmap_area; +} +#endif + +extern long sched_setaffinity(pid_t pid, cpumask_t new_mask); +extern long sched_getaffinity(pid_t pid, cpumask_t *mask); + +#ifdef CONFIG_MAGIC_SYSRQ + +extern void normalize_rt_tasks(void); + +#endif + +/* try_to_freeze + * + * Checks whether we need to enter the refrigerator + * and returns 1 if we did so. + */ +#ifdef CONFIG_PM +extern void refrigerator(unsigned long); +extern int freeze_processes(void); +extern void thaw_processes(void); + +static inline int try_to_freeze(unsigned long refrigerator_flags) +{ + if (unlikely(current->flags & PF_FREEZE)) { + refrigerator(refrigerator_flags); + return 1; + } else + return 0; +} +#else +static inline void refrigerator(unsigned long flag) {} +static inline int freeze_processes(void) { BUG(); return 0; } +static inline void thaw_processes(void) {} + +static inline int try_to_freeze(unsigned long refrigerator_flags) +{ + return 0; +} +#endif /* CONFIG_PM */ +#endif /* __KERNEL__ */ + +#endif |