kernel/workqueue_internal.h

   1 /*
   2  * kernel/workqueue_internal.h
   3  *
   4  * Workqueue internal header file.  Only to be included by workqueue and
   5  * core kernel subsystems.
   6  */
   7 #ifndef _KERNEL_WORKQUEUE_INTERNAL_H
   8 #define _KERNEL_WORKQUEUE_INTERNAL_H
   9
  10 #include <linux/workqueue.h>
  11 #include <linux/kthread.h>
  12
  13 struct worker_pool;
  14
  15 /*
  16  * The poor guys doing the actual heavy lifting.  All on-duty workers are
  17  * either serving the manager role, on idle list or on busy hash.  For
  18  * details on the locking annotation (L, I, X...), refer to workqueue.c.
  19  *
  20  * Only to be used in workqueue and async.
  21  */
  22 struct worker {
  23         /* on idle list while idle, on busy hash table while busy */
  24         union {
  25                 struct list_head        entry;  /* L: while idle */
  26                 struct hlist_node       hentry; /* L: while busy */
  27         };
  28
  29         struct work_struct      *current_work;  /* L: work being processed */
  30         work_func_t             current_func;   /* L: current_work's fn */
  31         struct pool_workqueue   *current_pwq; /* L: current_work's pwq */
  32         bool                    desc_valid;     /* ->desc is valid */
  33         struct list_head        scheduled;      /* L: scheduled works */
  34
  35         /* 64 bytes boundary on 64bit, 32 on 32bit */
  36
  37         struct task_struct      *task;          /* I: worker task */
  38         struct worker_pool      *pool;          /* I: the associated pool */
  39                                                 /* L: for rescuers */
  40         struct list_head        node;           /* A: anchored at pool->workers */
  41                                                 /* A: runs through worker->node */
  42
  43         unsigned long           last_active;    /* L: last active timestamp */
  44         unsigned int            flags;          /* X: flags */
  45         int                     id;             /* I: worker id */
  46
  47         /*
  48          * Opaque string set with work_set_desc().  Printed out with task
  49          * dump for debugging - WARN, BUG, panic or sysrq.
  50          */
  51         char                    desc[WORKER_DESC_LEN];
  52
  53         /* used only by rescuers to point to the target workqueue */
  54         struct workqueue_struct *rescue_wq;     /* I: the workqueue to rescue */
  55 };
  56
  57 /**
  58  * current_wq_worker - return struct worker if %current is a workqueue worker
  59  */
  60 static inline struct worker *current_wq_worker(void)
  61 {
  62         if (current->flags & PF_WQ_WORKER)
  63                 return kthread_data(current);
  64         return NULL;
  65 }
  66
  67 /*
  68  * Scheduler hooks for concurrency managed workqueue.  Only to be used from
  69  * sched/core.c and workqueue.c.
  70  */
  71 void wq_worker_waking_up(struct task_struct *task, int cpu);
  72 struct task_struct *wq_worker_sleeping(struct task_struct *task);
  73
  74 #endif /* _KERNEL_WORKQUEUE_INTERNAL_H */