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 41 unsigned long last_active; /* L: last active timestamp */ 42 unsigned int flags; /* X: flags */ 43 int id; /* I: worker id */ 44 45 /* 46 * Opaque string set with work_set_desc(). Printed out with task 47 * dump for debugging - WARN, BUG, panic or sysrq. 48 */ 49 char desc[WORKER_DESC_LEN]; 50 51 /* used only by rescuers to point to the target workqueue */ 52 struct workqueue_struct *rescue_wq; /* I: the workqueue to rescue */ 53 }; 54 55 /** 56 * current_wq_worker - return struct worker if %current is a workqueue worker 57 */ 58 static inline struct worker *current_wq_worker(void) 59 { 60 if (current->flags & PF_WQ_WORKER) 61 return kthread_data(current); 62 return NULL; 63 } 64 65 /* 66 * Scheduler hooks for concurrency managed workqueue. Only to be used from 67 * sched/core.c and workqueue.c. 68 */ 69 void wq_worker_waking_up(struct task_struct *task, int cpu); 70 struct task_struct *wq_worker_sleeping(struct task_struct *task, int cpu); 71 72 #endif /* _KERNEL_WORKQUEUE_INTERNAL_H */ 73