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 #include <linux/preempt.h> 13 14 struct worker_pool; 15 16 /* 17 * The poor guys doing the actual heavy lifting. All on-duty workers are 18 * either serving the manager role, on idle list or on busy hash. For 19 * details on the locking annotation (L, I, X...), refer to workqueue.c. 20 * 21 * Only to be used in workqueue and async. 22 */ 23 struct worker { 24 /* on idle list while idle, on busy hash table while busy */ 25 union { 26 struct list_head entry; /* L: while idle */ 27 struct hlist_node hentry; /* L: while busy */ 28 }; 29 30 struct work_struct *current_work; /* L: work being processed */ 31 work_func_t current_func; /* L: current_work's fn */ 32 struct pool_workqueue *current_pwq; /* L: current_work's pwq */ 33 bool desc_valid; /* ->desc is valid */ 34 struct list_head scheduled; /* L: scheduled works */ 35 36 /* 64 bytes boundary on 64bit, 32 on 32bit */ 37 38 struct task_struct *task; /* I: worker task */ 39 struct worker_pool *pool; /* I: the associated pool */ 40 /* L: for rescuers */ 41 struct list_head node; /* A: anchored at pool->workers */ 42 /* A: runs through worker->node */ 43 44 unsigned long last_active; /* L: last active timestamp */ 45 unsigned int flags; /* X: flags */ 46 int id; /* I: worker id */ 47 48 /* 49 * Opaque string set with work_set_desc(). Printed out with task 50 * dump for debugging - WARN, BUG, panic or sysrq. 51 */ 52 char desc[WORKER_DESC_LEN]; 53 54 /* used only by rescuers to point to the target workqueue */ 55 struct workqueue_struct *rescue_wq; /* I: the workqueue to rescue */ 56 }; 57 58 /** 59 * current_wq_worker - return struct worker if %current is a workqueue worker 60 */ current_wq_worker(void)61static inline struct worker *current_wq_worker(void) 62 { 63 if (in_task() && (current->flags & PF_WQ_WORKER)) 64 return kthread_data(current); 65 return NULL; 66 } 67 68 /* 69 * Scheduler hooks for concurrency managed workqueue. Only to be used from 70 * sched/core.c and workqueue.c. 71 */ 72 void wq_worker_waking_up(struct task_struct *task, int cpu); 73 struct task_struct *wq_worker_sleeping(struct task_struct *task); 74 75 #endif /* _KERNEL_WORKQUEUE_INTERNAL_H */ 76