diff options
Diffstat (limited to 'include/linux/kthread.h')
| -rw-r--r-- | include/linux/kthread.h | 88 |
1 files changed, 78 insertions, 10 deletions
diff --git a/include/linux/kthread.h b/include/linux/kthread.h index e691b6a23f72..a6e82a69c363 100644 --- a/include/linux/kthread.h +++ b/include/linux/kthread.h @@ -10,6 +10,17 @@ struct task_struct *kthread_create_on_node(int (*threadfn)(void *data), int node, const char namefmt[], ...); +/** + * kthread_create - create a kthread on the current node + * @threadfn: the function to run in the thread + * @data: data pointer for @threadfn() + * @namefmt: printf-style format string for the thread name + * @...: arguments for @namefmt. + * + * This macro will create a kthread on the current node, leaving it in + * the stopped state. This is just a helper for kthread_create_on_node(); + * see the documentation there for more details. + */ #define kthread_create(threadfn, data, namefmt, arg...) \ kthread_create_on_node(threadfn, data, NUMA_NO_NODE, namefmt, ##arg) @@ -44,7 +55,7 @@ bool kthread_should_stop(void); bool kthread_should_park(void); bool kthread_freezable_should_stop(bool *was_frozen); void *kthread_data(struct task_struct *k); -void *probe_kthread_data(struct task_struct *k); +void *kthread_probe_data(struct task_struct *k); int kthread_park(struct task_struct *k); void kthread_unpark(struct task_struct *k); void kthread_parkme(void); @@ -57,16 +68,23 @@ extern int tsk_fork_get_node(struct task_struct *tsk); * Simple work processor based on kthread. * * This provides easier way to make use of kthreads. A kthread_work - * can be queued and flushed using queue/flush_kthread_work() + * can be queued and flushed using queue/kthread_flush_work() * respectively. Queued kthread_works are processed by a kthread * running kthread_worker_fn(). */ struct kthread_work; typedef void (*kthread_work_func_t)(struct kthread_work *work); +void kthread_delayed_work_timer_fn(unsigned long __data); + +enum { + KTW_FREEZABLE = 1 << 0, /* freeze during suspend */ +}; struct kthread_worker { + unsigned int flags; spinlock_t lock; struct list_head work_list; + struct list_head delayed_work_list; struct task_struct *task; struct kthread_work *current_work; }; @@ -75,11 +93,19 @@ struct kthread_work { struct list_head node; kthread_work_func_t func; struct kthread_worker *worker; + /* Number of canceling calls that are running at the moment. */ + int canceling; +}; + +struct kthread_delayed_work { + struct kthread_work work; + struct timer_list timer; }; #define KTHREAD_WORKER_INIT(worker) { \ .lock = __SPIN_LOCK_UNLOCKED((worker).lock), \ .work_list = LIST_HEAD_INIT((worker).work_list), \ + .delayed_work_list = LIST_HEAD_INIT((worker).delayed_work_list),\ } #define KTHREAD_WORK_INIT(work, fn) { \ @@ -87,46 +113,88 @@ struct kthread_work { .func = (fn), \ } +#define KTHREAD_DELAYED_WORK_INIT(dwork, fn) { \ + .work = KTHREAD_WORK_INIT((dwork).work, (fn)), \ + .timer = __TIMER_INITIALIZER(kthread_delayed_work_timer_fn, \ + 0, (unsigned long)&(dwork), \ + TIMER_IRQSAFE), \ + } + #define DEFINE_KTHREAD_WORKER(worker) \ struct kthread_worker worker = KTHREAD_WORKER_INIT(worker) #define DEFINE_KTHREAD_WORK(work, fn) \ struct kthread_work work = KTHREAD_WORK_INIT(work, fn) +#define DEFINE_KTHREAD_DELAYED_WORK(dwork, fn) \ + struct kthread_delayed_work dwork = \ + KTHREAD_DELAYED_WORK_INIT(dwork, fn) + /* * kthread_worker.lock needs its own lockdep class key when defined on * stack with lockdep enabled. Use the following macros in such cases. */ #ifdef CONFIG_LOCKDEP # define KTHREAD_WORKER_INIT_ONSTACK(worker) \ - ({ init_kthread_worker(&worker); worker; }) + ({ kthread_init_worker(&worker); worker; }) # define DEFINE_KTHREAD_WORKER_ONSTACK(worker) \ struct kthread_worker worker = KTHREAD_WORKER_INIT_ONSTACK(worker) #else # define DEFINE_KTHREAD_WORKER_ONSTACK(worker) DEFINE_KTHREAD_WORKER(worker) #endif -extern void __init_kthread_worker(struct kthread_worker *worker, +extern void __kthread_init_worker(struct kthread_worker *worker, const char *name, struct lock_class_key *key); -#define init_kthread_worker(worker) \ +#define kthread_init_worker(worker) \ do { \ static struct lock_class_key __key; \ - __init_kthread_worker((worker), "("#worker")->lock", &__key); \ + __kthread_init_worker((worker), "("#worker")->lock", &__key); \ } while (0) -#define init_kthread_work(work, fn) \ +#define kthread_init_work(work, fn) \ do { \ memset((work), 0, sizeof(struct kthread_work)); \ INIT_LIST_HEAD(&(work)->node); \ (work)->func = (fn); \ } while (0) +#define kthread_init_delayed_work(dwork, fn) \ + do { \ + kthread_init_work(&(dwork)->work, (fn)); \ + __setup_timer(&(dwork)->timer, \ + kthread_delayed_work_timer_fn, \ + (unsigned long)(dwork), \ + TIMER_IRQSAFE); \ + } while (0) + int kthread_worker_fn(void *worker_ptr); -bool queue_kthread_work(struct kthread_worker *worker, +__printf(2, 3) +struct kthread_worker * +kthread_create_worker(unsigned int flags, const char namefmt[], ...); + +struct kthread_worker * +kthread_create_worker_on_cpu(int cpu, unsigned int flags, + const char namefmt[], ...); + +bool kthread_queue_work(struct kthread_worker *worker, struct kthread_work *work); -void flush_kthread_work(struct kthread_work *work); -void flush_kthread_worker(struct kthread_worker *worker); + +bool kthread_queue_delayed_work(struct kthread_worker *worker, + struct kthread_delayed_work *dwork, + unsigned long delay); + +bool kthread_mod_delayed_work(struct kthread_worker *worker, + struct kthread_delayed_work *dwork, + unsigned long delay); + +void kthread_flush_work(struct kthread_work *work); +void kthread_flush_worker(struct kthread_worker *worker); + +bool kthread_cancel_work_sync(struct kthread_work *work); +bool kthread_cancel_delayed_work_sync(struct kthread_delayed_work *work); + +void kthread_destroy_worker(struct kthread_worker *worker); #endif /* _LINUX_KTHREAD_H */ |