*参照元 [#hb49f591] #backlinks *説明 [#o176a6d1] -パス: [[linux-2.6.33/kernel/workqueue.c]] -FIXME: これは何? --説明 **引数 [#t6eba761] -const char *name --ワークキューの名前。 -int singlethread -- -int freezeable -- -int rt -- -struct lock_class_key *key -- --[[linux-2.6.33/lock_class_key]] -const char *lock_name -- **返り値 [#nfef0904] -struct workqueue_struct * --ワークキューへのポインタ。失敗したときは NULL。 **参考 [#z031b8b9] *実装 [#ja84f510] struct workqueue_struct *__create_workqueue_key(const char *name, int singlethread, int freezeable, int rt, struct lock_class_key *key, const char *lock_name) { struct workqueue_struct *wq; struct cpu_workqueue_struct *cwq; int err = 0, cpu; - --[[linux-2.6.33/workqueue_struct]] - --[[linux-2.6.33/cpu_workqueue_struct]] wq = kzalloc(sizeof(*wq), GFP_KERNEL); if (!wq) return NULL; - --[[linux-2.6.33/GFP_KERNEL]] - --[[linux-2.6.33/kzalloc()]] wq->cpu_wq = alloc_percpu(struct cpu_workqueue_struct); if (!wq->cpu_wq) { kfree(wq); return NULL; } - --[[linux-2.6.33/alloc_percpu()]] wq->name = name; lockdep_init_map(&wq->lockdep_map, lock_name, key, 0); wq->singlethread = singlethread; wq->freezeable = freezeable; wq->rt = rt; INIT_LIST_HEAD(&wq->list); - --[[linux-2.6.33/lockdep_init_map()]] - --[[linux-2.6.33/INIT_LIST_HEAD()]] if (singlethread) { cwq = init_cpu_workqueue(wq, singlethread_cpu); err = create_workqueue_thread(cwq, singlethread_cpu); start_workqueue_thread(cwq, -1); -singlethread_cpu は、static 変数、int 型 - --[[linux-2.6.33/init_cpu_workqueue()]] - --[[linux-2.6.33/create_workqueue_thread()]] - --[[linux-2.6.33/start_workqueue_thread()]] } else { cpu_maps_update_begin(); - --[[linux-2.6.33/cpu_maps_update_begin()]] /* * We must place this wq on list even if the code below fails. * cpu_down(cpu) can remove cpu from cpu_populated_map before * destroy_workqueue() takes the lock, in that case we leak * cwq[cpu]->thread. */ spin_lock(&workqueue_lock); list_add(&wq->list, &workqueues); spin_unlock(&workqueue_lock); - --[[linux-2.6.33/spin_lock()]] - --[[linux-2.6.33/list_add()]] - --[[linux-2.6.33/spin_unlock()]] /* * We must initialize cwqs for each possible cpu even if we * are going to call destroy_workqueue() finally. Otherwise * cpu_up() can hit the uninitialized cwq once we drop the * lock. */ for_each_possible_cpu(cpu) { - --[[linux-2.6.33/for_each_possible_cpu()]] cwq = init_cpu_workqueue(wq, cpu); if (err || !cpu_online(cpu)) continue; - --[[linux-2.6.33/init_cpu_workqueue()]] - --[[linux-2.6.33/cpu_online()]] err = create_workqueue_thread(cwq, cpu); start_workqueue_thread(cwq, cpu); - --[[linux-2.6.33/create_workqueue_thread()]] - --[[linux-2.6.33/start_workqueue_thead()]] } cpu_maps_update_done(); - --[[linux-2.6.33/cpu_maps_update_done()]] } if (err) { destroy_workqueue(wq); wq = NULL; } - --[[linux-2.6.33/destroy_workqueue()]] return wq; } EXPORT_SYMBOL_GPL(__create_workqueue_key); -GPL ライセンスのモジュールにのみシンボルを公開する。 -GPL のモジュールにのみシンボルを公開する。 --[[linux-2.6.33/EXPORT_SYMBOL_GPL()]] *コメント [#z3ccee47]