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, int cpu); 73 74 #endif /* _KERNEL_WORKQUEUE_INTERNAL_H */ 75