基于Linux的源代码

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;
    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;
    unsigned long it_real_value, it_real_incr;
    cputime_t it_virt_value, it_virt_incr;
    cputime_t it_prof_value, it_prof_incr;
    struct timer_list real_timer;
    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;
/* 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 *session_keyring;    /* keyring inherited over fork */
    struct key *process_keyring;    /* keyring private to this process (CLONE_THREAD) */
    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;

/* 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
};

 __wait_event_interruptible_timeout(wq, condition, ret)        do {                                        DEFINE_WAIT(__wait);                                                                for (;;) {                                    prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE);            if (condition)                                    break;                                if (!signal_pending(current)) {                            ret = schedule_timeout(ret);                        if (!ret)                                    break;                                continue;                            }                                    ret = -ERESTARTSYS;                            break;                                }                                    finish_wait(&wq, &__wait);                    } while (0)

　 #define SCHED_NORMAL            0
 　#define SCHED_FIFO              1
  #define SCHED_RR                2
  #define SCHED_BATCH             3
　#define SCHED_IDLE              5