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1221 lines
43 KiB
1221 lines
43 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_WAIT_H |
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#define _LINUX_WAIT_H |
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/* |
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* Linux wait queue related types and methods |
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*/ |
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#include <linux/list.h> |
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#include <linux/stddef.h> |
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#include <linux/spinlock.h> |
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#include <asm/current.h> |
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#include <uapi/linux/wait.h> |
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typedef struct wait_queue_entry wait_queue_entry_t; |
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typedef int (*wait_queue_func_t)(struct wait_queue_entry *wq_entry, unsigned mode, int flags, void *key); |
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int default_wake_function(struct wait_queue_entry *wq_entry, unsigned mode, int flags, void *key); |
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/* wait_queue_entry::flags */ |
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#define WQ_FLAG_EXCLUSIVE 0x01 |
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#define WQ_FLAG_WOKEN 0x02 |
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#define WQ_FLAG_BOOKMARK 0x04 |
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#define WQ_FLAG_CUSTOM 0x08 |
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#define WQ_FLAG_DONE 0x10 |
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#define WQ_FLAG_PRIORITY 0x20 |
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/* |
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* A single wait-queue entry structure: |
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*/ |
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struct wait_queue_entry { |
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unsigned int flags; |
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void *private; |
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wait_queue_func_t func; |
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struct list_head entry; |
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}; |
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struct wait_queue_head { |
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spinlock_t lock; |
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struct list_head head; |
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}; |
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typedef struct wait_queue_head wait_queue_head_t; |
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struct task_struct; |
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/* |
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* Macros for declaration and initialisaton of the datatypes |
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*/ |
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#define __WAITQUEUE_INITIALIZER(name, tsk) { \ |
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.private = tsk, \ |
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.func = default_wake_function, \ |
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.entry = { NULL, NULL } } |
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#define DECLARE_WAITQUEUE(name, tsk) \ |
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struct wait_queue_entry name = __WAITQUEUE_INITIALIZER(name, tsk) |
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#define __WAIT_QUEUE_HEAD_INITIALIZER(name) { \ |
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.lock = __SPIN_LOCK_UNLOCKED(name.lock), \ |
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.head = LIST_HEAD_INIT(name.head) } |
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#define DECLARE_WAIT_QUEUE_HEAD(name) \ |
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struct wait_queue_head name = __WAIT_QUEUE_HEAD_INITIALIZER(name) |
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extern void __init_waitqueue_head(struct wait_queue_head *wq_head, const char *name, struct lock_class_key *); |
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#define init_waitqueue_head(wq_head) \ |
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do { \ |
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static struct lock_class_key __key; \ |
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\ |
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__init_waitqueue_head((wq_head), #wq_head, &__key); \ |
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} while (0) |
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#ifdef CONFIG_LOCKDEP |
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# define __WAIT_QUEUE_HEAD_INIT_ONSTACK(name) \ |
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({ init_waitqueue_head(&name); name; }) |
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# define DECLARE_WAIT_QUEUE_HEAD_ONSTACK(name) \ |
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struct wait_queue_head name = __WAIT_QUEUE_HEAD_INIT_ONSTACK(name) |
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#else |
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# define DECLARE_WAIT_QUEUE_HEAD_ONSTACK(name) DECLARE_WAIT_QUEUE_HEAD(name) |
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#endif |
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static inline void init_waitqueue_entry(struct wait_queue_entry *wq_entry, struct task_struct *p) |
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{ |
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wq_entry->flags = 0; |
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wq_entry->private = p; |
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wq_entry->func = default_wake_function; |
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} |
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static inline void |
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init_waitqueue_func_entry(struct wait_queue_entry *wq_entry, wait_queue_func_t func) |
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{ |
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wq_entry->flags = 0; |
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wq_entry->private = NULL; |
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wq_entry->func = func; |
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} |
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/** |
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* waitqueue_active -- locklessly test for waiters on the queue |
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* @wq_head: the waitqueue to test for waiters |
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* |
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* returns true if the wait list is not empty |
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* |
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* NOTE: this function is lockless and requires care, incorrect usage _will_ |
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* lead to sporadic and non-obvious failure. |
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* |
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* Use either while holding wait_queue_head::lock or when used for wakeups |
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* with an extra smp_mb() like:: |
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* |
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* CPU0 - waker CPU1 - waiter |
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* |
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* for (;;) { |
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* @cond = true; prepare_to_wait(&wq_head, &wait, state); |
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* smp_mb(); // smp_mb() from set_current_state() |
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* if (waitqueue_active(wq_head)) if (@cond) |
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* wake_up(wq_head); break; |
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* schedule(); |
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* } |
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* finish_wait(&wq_head, &wait); |
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* |
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* Because without the explicit smp_mb() it's possible for the |
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* waitqueue_active() load to get hoisted over the @cond store such that we'll |
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* observe an empty wait list while the waiter might not observe @cond. |
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* |
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* Also note that this 'optimization' trades a spin_lock() for an smp_mb(), |
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* which (when the lock is uncontended) are of roughly equal cost. |
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*/ |
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static inline int waitqueue_active(struct wait_queue_head *wq_head) |
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{ |
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return !list_empty(&wq_head->head); |
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} |
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/** |
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* wq_has_single_sleeper - check if there is only one sleeper |
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* @wq_head: wait queue head |
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* |
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* Returns true of wq_head has only one sleeper on the list. |
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* |
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* Please refer to the comment for waitqueue_active. |
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*/ |
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static inline bool wq_has_single_sleeper(struct wait_queue_head *wq_head) |
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{ |
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return list_is_singular(&wq_head->head); |
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} |
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/** |
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* wq_has_sleeper - check if there are any waiting processes |
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* @wq_head: wait queue head |
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* |
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* Returns true if wq_head has waiting processes |
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* |
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* Please refer to the comment for waitqueue_active. |
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*/ |
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static inline bool wq_has_sleeper(struct wait_queue_head *wq_head) |
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{ |
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/* |
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* We need to be sure we are in sync with the |
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* add_wait_queue modifications to the wait queue. |
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* |
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* This memory barrier should be paired with one on the |
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* waiting side. |
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*/ |
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smp_mb(); |
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return waitqueue_active(wq_head); |
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} |
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extern void add_wait_queue(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry); |
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extern void add_wait_queue_exclusive(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry); |
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extern void add_wait_queue_priority(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry); |
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extern void remove_wait_queue(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry); |
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static inline void __add_wait_queue(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry) |
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{ |
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struct list_head *head = &wq_head->head; |
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struct wait_queue_entry *wq; |
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list_for_each_entry(wq, &wq_head->head, entry) { |
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if (!(wq->flags & WQ_FLAG_PRIORITY)) |
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break; |
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head = &wq->entry; |
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} |
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list_add(&wq_entry->entry, head); |
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} |
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/* |
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* Used for wake-one threads: |
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*/ |
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static inline void |
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__add_wait_queue_exclusive(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry) |
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{ |
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wq_entry->flags |= WQ_FLAG_EXCLUSIVE; |
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__add_wait_queue(wq_head, wq_entry); |
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} |
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static inline void __add_wait_queue_entry_tail(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry) |
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{ |
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list_add_tail(&wq_entry->entry, &wq_head->head); |
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} |
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static inline void |
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__add_wait_queue_entry_tail_exclusive(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry) |
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{ |
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wq_entry->flags |= WQ_FLAG_EXCLUSIVE; |
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__add_wait_queue_entry_tail(wq_head, wq_entry); |
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} |
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static inline void |
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__remove_wait_queue(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry) |
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{ |
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list_del(&wq_entry->entry); |
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} |
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void __wake_up(struct wait_queue_head *wq_head, unsigned int mode, int nr, void *key); |
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void __wake_up_locked_key(struct wait_queue_head *wq_head, unsigned int mode, void *key); |
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void __wake_up_locked_key_bookmark(struct wait_queue_head *wq_head, |
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unsigned int mode, void *key, wait_queue_entry_t *bookmark); |
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void __wake_up_sync_key(struct wait_queue_head *wq_head, unsigned int mode, void *key); |
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void __wake_up_locked_sync_key(struct wait_queue_head *wq_head, unsigned int mode, void *key); |
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void __wake_up_locked(struct wait_queue_head *wq_head, unsigned int mode, int nr); |
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void __wake_up_sync(struct wait_queue_head *wq_head, unsigned int mode); |
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void __wake_up_pollfree(struct wait_queue_head *wq_head); |
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#define wake_up(x) __wake_up(x, TASK_NORMAL, 1, NULL) |
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#define wake_up_nr(x, nr) __wake_up(x, TASK_NORMAL, nr, NULL) |
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#define wake_up_all(x) __wake_up(x, TASK_NORMAL, 0, NULL) |
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#define wake_up_locked(x) __wake_up_locked((x), TASK_NORMAL, 1) |
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#define wake_up_all_locked(x) __wake_up_locked((x), TASK_NORMAL, 0) |
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#define wake_up_interruptible(x) __wake_up(x, TASK_INTERRUPTIBLE, 1, NULL) |
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#define wake_up_interruptible_nr(x, nr) __wake_up(x, TASK_INTERRUPTIBLE, nr, NULL) |
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#define wake_up_interruptible_all(x) __wake_up(x, TASK_INTERRUPTIBLE, 0, NULL) |
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#define wake_up_interruptible_sync(x) __wake_up_sync((x), TASK_INTERRUPTIBLE) |
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/* |
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* Wakeup macros to be used to report events to the targets. |
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*/ |
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#define poll_to_key(m) ((void *)(__force uintptr_t)(__poll_t)(m)) |
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#define key_to_poll(m) ((__force __poll_t)(uintptr_t)(void *)(m)) |
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#define wake_up_poll(x, m) \ |
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__wake_up(x, TASK_NORMAL, 1, poll_to_key(m)) |
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#define wake_up_locked_poll(x, m) \ |
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__wake_up_locked_key((x), TASK_NORMAL, poll_to_key(m)) |
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#define wake_up_interruptible_poll(x, m) \ |
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__wake_up(x, TASK_INTERRUPTIBLE, 1, poll_to_key(m)) |
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#define wake_up_interruptible_sync_poll(x, m) \ |
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__wake_up_sync_key((x), TASK_INTERRUPTIBLE, poll_to_key(m)) |
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#define wake_up_interruptible_sync_poll_locked(x, m) \ |
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__wake_up_locked_sync_key((x), TASK_INTERRUPTIBLE, poll_to_key(m)) |
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/** |
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* wake_up_pollfree - signal that a polled waitqueue is going away |
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* @wq_head: the wait queue head |
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* |
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* In the very rare cases where a ->poll() implementation uses a waitqueue whose |
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* lifetime is tied to a task rather than to the 'struct file' being polled, |
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* this function must be called before the waitqueue is freed so that |
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* non-blocking polls (e.g. epoll) are notified that the queue is going away. |
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* |
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* The caller must also RCU-delay the freeing of the wait_queue_head, e.g. via |
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* an explicit synchronize_rcu() or call_rcu(), or via SLAB_TYPESAFE_BY_RCU. |
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*/ |
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static inline void wake_up_pollfree(struct wait_queue_head *wq_head) |
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{ |
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/* |
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* For performance reasons, we don't always take the queue lock here. |
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* Therefore, we might race with someone removing the last entry from |
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* the queue, and proceed while they still hold the queue lock. |
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* However, rcu_read_lock() is required to be held in such cases, so we |
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* can safely proceed with an RCU-delayed free. |
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*/ |
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if (waitqueue_active(wq_head)) |
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__wake_up_pollfree(wq_head); |
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} |
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#define ___wait_cond_timeout(condition) \ |
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({ \ |
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bool __cond = (condition); \ |
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if (__cond && !__ret) \ |
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__ret = 1; \ |
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__cond || !__ret; \ |
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}) |
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#define ___wait_is_interruptible(state) \ |
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(!__builtin_constant_p(state) || \ |
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(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) |
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extern void init_wait_entry(struct wait_queue_entry *wq_entry, int flags); |
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/* |
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* The below macro ___wait_event() has an explicit shadow of the __ret |
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* variable when used from the wait_event_*() macros. |
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* |
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* This is so that both can use the ___wait_cond_timeout() construct |
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* to wrap the condition. |
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* |
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* The type inconsistency of the wait_event_*() __ret variable is also |
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* on purpose; we use long where we can return timeout values and int |
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* otherwise. |
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*/ |
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#define ___wait_event(wq_head, condition, state, exclusive, ret, cmd) \ |
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({ \ |
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__label__ __out; \ |
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struct wait_queue_entry __wq_entry; \ |
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long __ret = ret; /* explicit shadow */ \ |
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\ |
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init_wait_entry(&__wq_entry, exclusive ? WQ_FLAG_EXCLUSIVE : 0); \ |
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for (;;) { \ |
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long __int = prepare_to_wait_event(&wq_head, &__wq_entry, state);\ |
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\ |
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if (condition) \ |
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break; \ |
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\ |
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if (___wait_is_interruptible(state) && __int) { \ |
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__ret = __int; \ |
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goto __out; \ |
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} \ |
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\ |
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cmd; \ |
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} \ |
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finish_wait(&wq_head, &__wq_entry); \ |
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__out: __ret; \ |
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}) |
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#define __wait_event(wq_head, condition) \ |
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(void)___wait_event(wq_head, condition, TASK_UNINTERRUPTIBLE, 0, 0, \ |
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schedule()) |
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/** |
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* wait_event - sleep until a condition gets true |
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* @wq_head: the waitqueue to wait on |
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* @condition: a C expression for the event to wait for |
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* |
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* The process is put to sleep (TASK_UNINTERRUPTIBLE) until the |
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* @condition evaluates to true. The @condition is checked each time |
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* the waitqueue @wq_head is woken up. |
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* |
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* wake_up() has to be called after changing any variable that could |
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* change the result of the wait condition. |
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*/ |
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#define wait_event(wq_head, condition) \ |
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do { \ |
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might_sleep(); \ |
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if (condition) \ |
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break; \ |
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__wait_event(wq_head, condition); \ |
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} while (0) |
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#define __io_wait_event(wq_head, condition) \ |
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(void)___wait_event(wq_head, condition, TASK_UNINTERRUPTIBLE, 0, 0, \ |
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io_schedule()) |
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/* |
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* io_wait_event() -- like wait_event() but with io_schedule() |
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*/ |
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#define io_wait_event(wq_head, condition) \ |
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do { \ |
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might_sleep(); \ |
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if (condition) \ |
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break; \ |
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__io_wait_event(wq_head, condition); \ |
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} while (0) |
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#define __wait_event_freezable(wq_head, condition) \ |
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___wait_event(wq_head, condition, (TASK_INTERRUPTIBLE|TASK_FREEZABLE), \ |
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0, 0, schedule()) |
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/** |
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* wait_event_freezable - sleep (or freeze) until a condition gets true |
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* @wq_head: the waitqueue to wait on |
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* @condition: a C expression for the event to wait for |
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* |
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* The process is put to sleep (TASK_INTERRUPTIBLE -- so as not to contribute |
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* to system load) until the @condition evaluates to true. The |
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* @condition is checked each time the waitqueue @wq_head is woken up. |
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* |
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* wake_up() has to be called after changing any variable that could |
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* change the result of the wait condition. |
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*/ |
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#define wait_event_freezable(wq_head, condition) \ |
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({ \ |
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int __ret = 0; \ |
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might_sleep(); \ |
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if (!(condition)) \ |
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__ret = __wait_event_freezable(wq_head, condition); \ |
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__ret; \ |
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}) |
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#define __wait_event_timeout(wq_head, condition, timeout) \ |
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___wait_event(wq_head, ___wait_cond_timeout(condition), \ |
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TASK_UNINTERRUPTIBLE, 0, timeout, \ |
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__ret = schedule_timeout(__ret)) |
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/** |
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* wait_event_timeout - sleep until a condition gets true or a timeout elapses |
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* @wq_head: the waitqueue to wait on |
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* @condition: a C expression for the event to wait for |
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* @timeout: timeout, in jiffies |
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* |
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* The process is put to sleep (TASK_UNINTERRUPTIBLE) until the |
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* @condition evaluates to true. The @condition is checked each time |
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* the waitqueue @wq_head is woken up. |
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* |
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* wake_up() has to be called after changing any variable that could |
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* change the result of the wait condition. |
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* |
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* Returns: |
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* 0 if the @condition evaluated to %false after the @timeout elapsed, |
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* 1 if the @condition evaluated to %true after the @timeout elapsed, |
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* or the remaining jiffies (at least 1) if the @condition evaluated |
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* to %true before the @timeout elapsed. |
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*/ |
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#define wait_event_timeout(wq_head, condition, timeout) \ |
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({ \ |
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long __ret = timeout; \ |
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might_sleep(); \ |
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if (!___wait_cond_timeout(condition)) \ |
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__ret = __wait_event_timeout(wq_head, condition, timeout); \ |
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__ret; \ |
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}) |
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#define __wait_event_freezable_timeout(wq_head, condition, timeout) \ |
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___wait_event(wq_head, ___wait_cond_timeout(condition), \ |
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(TASK_INTERRUPTIBLE|TASK_FREEZABLE), 0, timeout, \ |
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__ret = schedule_timeout(__ret)) |
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|
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/* |
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* like wait_event_timeout() -- except it uses TASK_INTERRUPTIBLE to avoid |
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* increasing load and is freezable. |
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*/ |
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#define wait_event_freezable_timeout(wq_head, condition, timeout) \ |
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({ \ |
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long __ret = timeout; \ |
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might_sleep(); \ |
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if (!___wait_cond_timeout(condition)) \ |
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__ret = __wait_event_freezable_timeout(wq_head, condition, timeout); \ |
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__ret; \ |
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}) |
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#define __wait_event_exclusive_cmd(wq_head, condition, cmd1, cmd2) \ |
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(void)___wait_event(wq_head, condition, TASK_UNINTERRUPTIBLE, 1, 0, \ |
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cmd1; schedule(); cmd2) |
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/* |
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* Just like wait_event_cmd(), except it sets exclusive flag |
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*/ |
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#define wait_event_exclusive_cmd(wq_head, condition, cmd1, cmd2) \ |
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do { \ |
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if (condition) \ |
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break; \ |
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__wait_event_exclusive_cmd(wq_head, condition, cmd1, cmd2); \ |
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} while (0) |
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|
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#define __wait_event_cmd(wq_head, condition, cmd1, cmd2) \ |
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(void)___wait_event(wq_head, condition, TASK_UNINTERRUPTIBLE, 0, 0, \ |
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cmd1; schedule(); cmd2) |
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|
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/** |
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* wait_event_cmd - sleep until a condition gets true |
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* @wq_head: the waitqueue to wait on |
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* @condition: a C expression for the event to wait for |
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* @cmd1: the command will be executed before sleep |
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* @cmd2: the command will be executed after sleep |
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* |
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* The process is put to sleep (TASK_UNINTERRUPTIBLE) until the |
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* @condition evaluates to true. The @condition is checked each time |
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* the waitqueue @wq_head is woken up. |
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* |
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* wake_up() has to be called after changing any variable that could |
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* change the result of the wait condition. |
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*/ |
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#define wait_event_cmd(wq_head, condition, cmd1, cmd2) \ |
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do { \ |
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if (condition) \ |
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break; \ |
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__wait_event_cmd(wq_head, condition, cmd1, cmd2); \ |
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} while (0) |
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|
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#define __wait_event_interruptible(wq_head, condition) \ |
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___wait_event(wq_head, condition, TASK_INTERRUPTIBLE, 0, 0, \ |
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schedule()) |
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|
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/** |
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* wait_event_interruptible - sleep until a condition gets true |
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* @wq_head: the waitqueue to wait on |
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* @condition: a C expression for the event to wait for |
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* |
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* The process is put to sleep (TASK_INTERRUPTIBLE) until the |
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* @condition evaluates to true or a signal is received. |
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* The @condition is checked each time the waitqueue @wq_head is woken up. |
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* |
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* wake_up() has to be called after changing any variable that could |
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* change the result of the wait condition. |
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* |
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* The function will return -ERESTARTSYS if it was interrupted by a |
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* signal and 0 if @condition evaluated to true. |
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*/ |
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#define wait_event_interruptible(wq_head, condition) \ |
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({ \ |
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int __ret = 0; \ |
|
might_sleep(); \ |
|
if (!(condition)) \ |
|
__ret = __wait_event_interruptible(wq_head, condition); \ |
|
__ret; \ |
|
}) |
|
|
|
#define __wait_event_interruptible_timeout(wq_head, condition, timeout) \ |
|
___wait_event(wq_head, ___wait_cond_timeout(condition), \ |
|
TASK_INTERRUPTIBLE, 0, timeout, \ |
|
__ret = schedule_timeout(__ret)) |
|
|
|
/** |
|
* wait_event_interruptible_timeout - sleep until a condition gets true or a timeout elapses |
|
* @wq_head: the waitqueue to wait on |
|
* @condition: a C expression for the event to wait for |
|
* @timeout: timeout, in jiffies |
|
* |
|
* The process is put to sleep (TASK_INTERRUPTIBLE) until the |
|
* @condition evaluates to true or a signal is received. |
|
* The @condition is checked each time the waitqueue @wq_head is woken up. |
|
* |
|
* wake_up() has to be called after changing any variable that could |
|
* change the result of the wait condition. |
|
* |
|
* Returns: |
|
* 0 if the @condition evaluated to %false after the @timeout elapsed, |
|
* 1 if the @condition evaluated to %true after the @timeout elapsed, |
|
* the remaining jiffies (at least 1) if the @condition evaluated |
|
* to %true before the @timeout elapsed, or -%ERESTARTSYS if it was |
|
* interrupted by a signal. |
|
*/ |
|
#define wait_event_interruptible_timeout(wq_head, condition, timeout) \ |
|
({ \ |
|
long __ret = timeout; \ |
|
might_sleep(); \ |
|
if (!___wait_cond_timeout(condition)) \ |
|
__ret = __wait_event_interruptible_timeout(wq_head, \ |
|
condition, timeout); \ |
|
__ret; \ |
|
}) |
|
|
|
#define __wait_event_hrtimeout(wq_head, condition, timeout, state) \ |
|
({ \ |
|
int __ret = 0; \ |
|
struct hrtimer_sleeper __t; \ |
|
\ |
|
hrtimer_init_sleeper_on_stack(&__t, CLOCK_MONOTONIC, \ |
|
HRTIMER_MODE_REL); \ |
|
if ((timeout) != KTIME_MAX) { \ |
|
hrtimer_set_expires_range_ns(&__t.timer, timeout, \ |
|
current->timer_slack_ns); \ |
|
hrtimer_sleeper_start_expires(&__t, HRTIMER_MODE_REL); \ |
|
} \ |
|
\ |
|
__ret = ___wait_event(wq_head, condition, state, 0, 0, \ |
|
if (!__t.task) { \ |
|
__ret = -ETIME; \ |
|
break; \ |
|
} \ |
|
schedule()); \ |
|
\ |
|
hrtimer_cancel(&__t.timer); \ |
|
destroy_hrtimer_on_stack(&__t.timer); \ |
|
__ret; \ |
|
}) |
|
|
|
/** |
|
* wait_event_hrtimeout - sleep until a condition gets true or a timeout elapses |
|
* @wq_head: the waitqueue to wait on |
|
* @condition: a C expression for the event to wait for |
|
* @timeout: timeout, as a ktime_t |
|
* |
|
* The process is put to sleep (TASK_UNINTERRUPTIBLE) until the |
|
* @condition evaluates to true or a signal is received. |
|
* The @condition is checked each time the waitqueue @wq_head is woken up. |
|
* |
|
* wake_up() has to be called after changing any variable that could |
|
* change the result of the wait condition. |
|
* |
|
* The function returns 0 if @condition became true, or -ETIME if the timeout |
|
* elapsed. |
|
*/ |
|
#define wait_event_hrtimeout(wq_head, condition, timeout) \ |
|
({ \ |
|
int __ret = 0; \ |
|
might_sleep(); \ |
|
if (!(condition)) \ |
|
__ret = __wait_event_hrtimeout(wq_head, condition, timeout, \ |
|
TASK_UNINTERRUPTIBLE); \ |
|
__ret; \ |
|
}) |
|
|
|
/** |
|
* wait_event_interruptible_hrtimeout - sleep until a condition gets true or a timeout elapses |
|
* @wq: the waitqueue to wait on |
|
* @condition: a C expression for the event to wait for |
|
* @timeout: timeout, as a ktime_t |
|
* |
|
* The process is put to sleep (TASK_INTERRUPTIBLE) until the |
|
* @condition evaluates to true or a signal is received. |
|
* The @condition is checked each time the waitqueue @wq is woken up. |
|
* |
|
* wake_up() has to be called after changing any variable that could |
|
* change the result of the wait condition. |
|
* |
|
* The function returns 0 if @condition became true, -ERESTARTSYS if it was |
|
* interrupted by a signal, or -ETIME if the timeout elapsed. |
|
*/ |
|
#define wait_event_interruptible_hrtimeout(wq, condition, timeout) \ |
|
({ \ |
|
long __ret = 0; \ |
|
might_sleep(); \ |
|
if (!(condition)) \ |
|
__ret = __wait_event_hrtimeout(wq, condition, timeout, \ |
|
TASK_INTERRUPTIBLE); \ |
|
__ret; \ |
|
}) |
|
|
|
#define __wait_event_interruptible_exclusive(wq, condition) \ |
|
___wait_event(wq, condition, TASK_INTERRUPTIBLE, 1, 0, \ |
|
schedule()) |
|
|
|
#define wait_event_interruptible_exclusive(wq, condition) \ |
|
({ \ |
|
int __ret = 0; \ |
|
might_sleep(); \ |
|
if (!(condition)) \ |
|
__ret = __wait_event_interruptible_exclusive(wq, condition); \ |
|
__ret; \ |
|
}) |
|
|
|
#define __wait_event_killable_exclusive(wq, condition) \ |
|
___wait_event(wq, condition, TASK_KILLABLE, 1, 0, \ |
|
schedule()) |
|
|
|
#define wait_event_killable_exclusive(wq, condition) \ |
|
({ \ |
|
int __ret = 0; \ |
|
might_sleep(); \ |
|
if (!(condition)) \ |
|
__ret = __wait_event_killable_exclusive(wq, condition); \ |
|
__ret; \ |
|
}) |
|
|
|
|
|
#define __wait_event_freezable_exclusive(wq, condition) \ |
|
___wait_event(wq, condition, (TASK_INTERRUPTIBLE|TASK_FREEZABLE), 1, 0,\ |
|
schedule()) |
|
|
|
#define wait_event_freezable_exclusive(wq, condition) \ |
|
({ \ |
|
int __ret = 0; \ |
|
might_sleep(); \ |
|
if (!(condition)) \ |
|
__ret = __wait_event_freezable_exclusive(wq, condition); \ |
|
__ret; \ |
|
}) |
|
|
|
/** |
|
* wait_event_idle - wait for a condition without contributing to system load |
|
* @wq_head: the waitqueue to wait on |
|
* @condition: a C expression for the event to wait for |
|
* |
|
* The process is put to sleep (TASK_IDLE) until the |
|
* @condition evaluates to true. |
|
* The @condition is checked each time the waitqueue @wq_head is woken up. |
|
* |
|
* wake_up() has to be called after changing any variable that could |
|
* change the result of the wait condition. |
|
* |
|
*/ |
|
#define wait_event_idle(wq_head, condition) \ |
|
do { \ |
|
might_sleep(); \ |
|
if (!(condition)) \ |
|
___wait_event(wq_head, condition, TASK_IDLE, 0, 0, schedule()); \ |
|
} while (0) |
|
|
|
/** |
|
* wait_event_idle_exclusive - wait for a condition with contributing to system load |
|
* @wq_head: the waitqueue to wait on |
|
* @condition: a C expression for the event to wait for |
|
* |
|
* The process is put to sleep (TASK_IDLE) until the |
|
* @condition evaluates to true. |
|
* The @condition is checked each time the waitqueue @wq_head is woken up. |
|
* |
|
* The process is put on the wait queue with an WQ_FLAG_EXCLUSIVE flag |
|
* set thus if other processes wait on the same list, when this |
|
* process is woken further processes are not considered. |
|
* |
|
* wake_up() has to be called after changing any variable that could |
|
* change the result of the wait condition. |
|
* |
|
*/ |
|
#define wait_event_idle_exclusive(wq_head, condition) \ |
|
do { \ |
|
might_sleep(); \ |
|
if (!(condition)) \ |
|
___wait_event(wq_head, condition, TASK_IDLE, 1, 0, schedule()); \ |
|
} while (0) |
|
|
|
#define __wait_event_idle_timeout(wq_head, condition, timeout) \ |
|
___wait_event(wq_head, ___wait_cond_timeout(condition), \ |
|
TASK_IDLE, 0, timeout, \ |
|
__ret = schedule_timeout(__ret)) |
|
|
|
/** |
|
* wait_event_idle_timeout - sleep without load until a condition becomes true or a timeout elapses |
|
* @wq_head: the waitqueue to wait on |
|
* @condition: a C expression for the event to wait for |
|
* @timeout: timeout, in jiffies |
|
* |
|
* The process is put to sleep (TASK_IDLE) until the |
|
* @condition evaluates to true. The @condition is checked each time |
|
* the waitqueue @wq_head is woken up. |
|
* |
|
* wake_up() has to be called after changing any variable that could |
|
* change the result of the wait condition. |
|
* |
|
* Returns: |
|
* 0 if the @condition evaluated to %false after the @timeout elapsed, |
|
* 1 if the @condition evaluated to %true after the @timeout elapsed, |
|
* or the remaining jiffies (at least 1) if the @condition evaluated |
|
* to %true before the @timeout elapsed. |
|
*/ |
|
#define wait_event_idle_timeout(wq_head, condition, timeout) \ |
|
({ \ |
|
long __ret = timeout; \ |
|
might_sleep(); \ |
|
if (!___wait_cond_timeout(condition)) \ |
|
__ret = __wait_event_idle_timeout(wq_head, condition, timeout); \ |
|
__ret; \ |
|
}) |
|
|
|
#define __wait_event_idle_exclusive_timeout(wq_head, condition, timeout) \ |
|
___wait_event(wq_head, ___wait_cond_timeout(condition), \ |
|
TASK_IDLE, 1, timeout, \ |
|
__ret = schedule_timeout(__ret)) |
|
|
|
/** |
|
* wait_event_idle_exclusive_timeout - sleep without load until a condition becomes true or a timeout elapses |
|
* @wq_head: the waitqueue to wait on |
|
* @condition: a C expression for the event to wait for |
|
* @timeout: timeout, in jiffies |
|
* |
|
* The process is put to sleep (TASK_IDLE) until the |
|
* @condition evaluates to true. The @condition is checked each time |
|
* the waitqueue @wq_head is woken up. |
|
* |
|
* The process is put on the wait queue with an WQ_FLAG_EXCLUSIVE flag |
|
* set thus if other processes wait on the same list, when this |
|
* process is woken further processes are not considered. |
|
* |
|
* wake_up() has to be called after changing any variable that could |
|
* change the result of the wait condition. |
|
* |
|
* Returns: |
|
* 0 if the @condition evaluated to %false after the @timeout elapsed, |
|
* 1 if the @condition evaluated to %true after the @timeout elapsed, |
|
* or the remaining jiffies (at least 1) if the @condition evaluated |
|
* to %true before the @timeout elapsed. |
|
*/ |
|
#define wait_event_idle_exclusive_timeout(wq_head, condition, timeout) \ |
|
({ \ |
|
long __ret = timeout; \ |
|
might_sleep(); \ |
|
if (!___wait_cond_timeout(condition)) \ |
|
__ret = __wait_event_idle_exclusive_timeout(wq_head, condition, timeout);\ |
|
__ret; \ |
|
}) |
|
|
|
extern int do_wait_intr(wait_queue_head_t *, wait_queue_entry_t *); |
|
extern int do_wait_intr_irq(wait_queue_head_t *, wait_queue_entry_t *); |
|
|
|
#define __wait_event_interruptible_locked(wq, condition, exclusive, fn) \ |
|
({ \ |
|
int __ret; \ |
|
DEFINE_WAIT(__wait); \ |
|
if (exclusive) \ |
|
__wait.flags |= WQ_FLAG_EXCLUSIVE; \ |
|
do { \ |
|
__ret = fn(&(wq), &__wait); \ |
|
if (__ret) \ |
|
break; \ |
|
} while (!(condition)); \ |
|
__remove_wait_queue(&(wq), &__wait); \ |
|
__set_current_state(TASK_RUNNING); \ |
|
__ret; \ |
|
}) |
|
|
|
|
|
/** |
|
* wait_event_interruptible_locked - sleep until a condition gets true |
|
* @wq: the waitqueue to wait on |
|
* @condition: a C expression for the event to wait for |
|
* |
|
* The process is put to sleep (TASK_INTERRUPTIBLE) until the |
|
* @condition evaluates to true or a signal is received. |
|
* The @condition is checked each time the waitqueue @wq is woken up. |
|
* |
|
* It must be called with wq.lock being held. This spinlock is |
|
* unlocked while sleeping but @condition testing is done while lock |
|
* is held and when this macro exits the lock is held. |
|
* |
|
* The lock is locked/unlocked using spin_lock()/spin_unlock() |
|
* functions which must match the way they are locked/unlocked outside |
|
* of this macro. |
|
* |
|
* wake_up_locked() has to be called after changing any variable that could |
|
* change the result of the wait condition. |
|
* |
|
* The function will return -ERESTARTSYS if it was interrupted by a |
|
* signal and 0 if @condition evaluated to true. |
|
*/ |
|
#define wait_event_interruptible_locked(wq, condition) \ |
|
((condition) \ |
|
? 0 : __wait_event_interruptible_locked(wq, condition, 0, do_wait_intr)) |
|
|
|
/** |
|
* wait_event_interruptible_locked_irq - sleep until a condition gets true |
|
* @wq: the waitqueue to wait on |
|
* @condition: a C expression for the event to wait for |
|
* |
|
* The process is put to sleep (TASK_INTERRUPTIBLE) until the |
|
* @condition evaluates to true or a signal is received. |
|
* The @condition is checked each time the waitqueue @wq is woken up. |
|
* |
|
* It must be called with wq.lock being held. This spinlock is |
|
* unlocked while sleeping but @condition testing is done while lock |
|
* is held and when this macro exits the lock is held. |
|
* |
|
* The lock is locked/unlocked using spin_lock_irq()/spin_unlock_irq() |
|
* functions which must match the way they are locked/unlocked outside |
|
* of this macro. |
|
* |
|
* wake_up_locked() has to be called after changing any variable that could |
|
* change the result of the wait condition. |
|
* |
|
* The function will return -ERESTARTSYS if it was interrupted by a |
|
* signal and 0 if @condition evaluated to true. |
|
*/ |
|
#define wait_event_interruptible_locked_irq(wq, condition) \ |
|
((condition) \ |
|
? 0 : __wait_event_interruptible_locked(wq, condition, 0, do_wait_intr_irq)) |
|
|
|
/** |
|
* wait_event_interruptible_exclusive_locked - sleep exclusively until a condition gets true |
|
* @wq: the waitqueue to wait on |
|
* @condition: a C expression for the event to wait for |
|
* |
|
* The process is put to sleep (TASK_INTERRUPTIBLE) until the |
|
* @condition evaluates to true or a signal is received. |
|
* The @condition is checked each time the waitqueue @wq is woken up. |
|
* |
|
* It must be called with wq.lock being held. This spinlock is |
|
* unlocked while sleeping but @condition testing is done while lock |
|
* is held and when this macro exits the lock is held. |
|
* |
|
* The lock is locked/unlocked using spin_lock()/spin_unlock() |
|
* functions which must match the way they are locked/unlocked outside |
|
* of this macro. |
|
* |
|
* The process is put on the wait queue with an WQ_FLAG_EXCLUSIVE flag |
|
* set thus when other process waits process on the list if this |
|
* process is awaken further processes are not considered. |
|
* |
|
* wake_up_locked() has to be called after changing any variable that could |
|
* change the result of the wait condition. |
|
* |
|
* The function will return -ERESTARTSYS if it was interrupted by a |
|
* signal and 0 if @condition evaluated to true. |
|
*/ |
|
#define wait_event_interruptible_exclusive_locked(wq, condition) \ |
|
((condition) \ |
|
? 0 : __wait_event_interruptible_locked(wq, condition, 1, do_wait_intr)) |
|
|
|
/** |
|
* wait_event_interruptible_exclusive_locked_irq - sleep until a condition gets true |
|
* @wq: the waitqueue to wait on |
|
* @condition: a C expression for the event to wait for |
|
* |
|
* The process is put to sleep (TASK_INTERRUPTIBLE) until the |
|
* @condition evaluates to true or a signal is received. |
|
* The @condition is checked each time the waitqueue @wq is woken up. |
|
* |
|
* It must be called with wq.lock being held. This spinlock is |
|
* unlocked while sleeping but @condition testing is done while lock |
|
* is held and when this macro exits the lock is held. |
|
* |
|
* The lock is locked/unlocked using spin_lock_irq()/spin_unlock_irq() |
|
* functions which must match the way they are locked/unlocked outside |
|
* of this macro. |
|
* |
|
* The process is put on the wait queue with an WQ_FLAG_EXCLUSIVE flag |
|
* set thus when other process waits process on the list if this |
|
* process is awaken further processes are not considered. |
|
* |
|
* wake_up_locked() has to be called after changing any variable that could |
|
* change the result of the wait condition. |
|
* |
|
* The function will return -ERESTARTSYS if it was interrupted by a |
|
* signal and 0 if @condition evaluated to true. |
|
*/ |
|
#define wait_event_interruptible_exclusive_locked_irq(wq, condition) \ |
|
((condition) \ |
|
? 0 : __wait_event_interruptible_locked(wq, condition, 1, do_wait_intr_irq)) |
|
|
|
|
|
#define __wait_event_killable(wq, condition) \ |
|
___wait_event(wq, condition, TASK_KILLABLE, 0, 0, schedule()) |
|
|
|
/** |
|
* wait_event_killable - sleep until a condition gets true |
|
* @wq_head: the waitqueue to wait on |
|
* @condition: a C expression for the event to wait for |
|
* |
|
* The process is put to sleep (TASK_KILLABLE) until the |
|
* @condition evaluates to true or a signal is received. |
|
* The @condition is checked each time the waitqueue @wq_head is woken up. |
|
* |
|
* wake_up() has to be called after changing any variable that could |
|
* change the result of the wait condition. |
|
* |
|
* The function will return -ERESTARTSYS if it was interrupted by a |
|
* signal and 0 if @condition evaluated to true. |
|
*/ |
|
#define wait_event_killable(wq_head, condition) \ |
|
({ \ |
|
int __ret = 0; \ |
|
might_sleep(); \ |
|
if (!(condition)) \ |
|
__ret = __wait_event_killable(wq_head, condition); \ |
|
__ret; \ |
|
}) |
|
|
|
#define __wait_event_state(wq, condition, state) \ |
|
___wait_event(wq, condition, state, 0, 0, schedule()) |
|
|
|
/** |
|
* wait_event_state - sleep until a condition gets true |
|
* @wq_head: the waitqueue to wait on |
|
* @condition: a C expression for the event to wait for |
|
* @state: state to sleep in |
|
* |
|
* The process is put to sleep (@state) until the @condition evaluates to true |
|
* or a signal is received (when allowed by @state). The @condition is checked |
|
* each time the waitqueue @wq_head is woken up. |
|
* |
|
* wake_up() has to be called after changing any variable that could |
|
* change the result of the wait condition. |
|
* |
|
* The function will return -ERESTARTSYS if it was interrupted by a signal |
|
* (when allowed by @state) and 0 if @condition evaluated to true. |
|
*/ |
|
#define wait_event_state(wq_head, condition, state) \ |
|
({ \ |
|
int __ret = 0; \ |
|
might_sleep(); \ |
|
if (!(condition)) \ |
|
__ret = __wait_event_state(wq_head, condition, state); \ |
|
__ret; \ |
|
}) |
|
|
|
#define __wait_event_killable_timeout(wq_head, condition, timeout) \ |
|
___wait_event(wq_head, ___wait_cond_timeout(condition), \ |
|
TASK_KILLABLE, 0, timeout, \ |
|
__ret = schedule_timeout(__ret)) |
|
|
|
/** |
|
* wait_event_killable_timeout - sleep until a condition gets true or a timeout elapses |
|
* @wq_head: the waitqueue to wait on |
|
* @condition: a C expression for the event to wait for |
|
* @timeout: timeout, in jiffies |
|
* |
|
* The process is put to sleep (TASK_KILLABLE) until the |
|
* @condition evaluates to true or a kill signal is received. |
|
* The @condition is checked each time the waitqueue @wq_head is woken up. |
|
* |
|
* wake_up() has to be called after changing any variable that could |
|
* change the result of the wait condition. |
|
* |
|
* Returns: |
|
* 0 if the @condition evaluated to %false after the @timeout elapsed, |
|
* 1 if the @condition evaluated to %true after the @timeout elapsed, |
|
* the remaining jiffies (at least 1) if the @condition evaluated |
|
* to %true before the @timeout elapsed, or -%ERESTARTSYS if it was |
|
* interrupted by a kill signal. |
|
* |
|
* Only kill signals interrupt this process. |
|
*/ |
|
#define wait_event_killable_timeout(wq_head, condition, timeout) \ |
|
({ \ |
|
long __ret = timeout; \ |
|
might_sleep(); \ |
|
if (!___wait_cond_timeout(condition)) \ |
|
__ret = __wait_event_killable_timeout(wq_head, \ |
|
condition, timeout); \ |
|
__ret; \ |
|
}) |
|
|
|
|
|
#define __wait_event_lock_irq(wq_head, condition, lock, cmd) \ |
|
(void)___wait_event(wq_head, condition, TASK_UNINTERRUPTIBLE, 0, 0, \ |
|
spin_unlock_irq(&lock); \ |
|
cmd; \ |
|
schedule(); \ |
|
spin_lock_irq(&lock)) |
|
|
|
/** |
|
* wait_event_lock_irq_cmd - sleep until a condition gets true. The |
|
* condition is checked under the lock. This |
|
* is expected to be called with the lock |
|
* taken. |
|
* @wq_head: the waitqueue to wait on |
|
* @condition: a C expression for the event to wait for |
|
* @lock: a locked spinlock_t, which will be released before cmd |
|
* and schedule() and reacquired afterwards. |
|
* @cmd: a command which is invoked outside the critical section before |
|
* sleep |
|
* |
|
* The process is put to sleep (TASK_UNINTERRUPTIBLE) until the |
|
* @condition evaluates to true. The @condition is checked each time |
|
* the waitqueue @wq_head is woken up. |
|
* |
|
* wake_up() has to be called after changing any variable that could |
|
* change the result of the wait condition. |
|
* |
|
* This is supposed to be called while holding the lock. The lock is |
|
* dropped before invoking the cmd and going to sleep and is reacquired |
|
* afterwards. |
|
*/ |
|
#define wait_event_lock_irq_cmd(wq_head, condition, lock, cmd) \ |
|
do { \ |
|
if (condition) \ |
|
break; \ |
|
__wait_event_lock_irq(wq_head, condition, lock, cmd); \ |
|
} while (0) |
|
|
|
/** |
|
* wait_event_lock_irq - sleep until a condition gets true. The |
|
* condition is checked under the lock. This |
|
* is expected to be called with the lock |
|
* taken. |
|
* @wq_head: the waitqueue to wait on |
|
* @condition: a C expression for the event to wait for |
|
* @lock: a locked spinlock_t, which will be released before schedule() |
|
* and reacquired afterwards. |
|
* |
|
* The process is put to sleep (TASK_UNINTERRUPTIBLE) until the |
|
* @condition evaluates to true. The @condition is checked each time |
|
* the waitqueue @wq_head is woken up. |
|
* |
|
* wake_up() has to be called after changing any variable that could |
|
* change the result of the wait condition. |
|
* |
|
* This is supposed to be called while holding the lock. The lock is |
|
* dropped before going to sleep and is reacquired afterwards. |
|
*/ |
|
#define wait_event_lock_irq(wq_head, condition, lock) \ |
|
do { \ |
|
if (condition) \ |
|
break; \ |
|
__wait_event_lock_irq(wq_head, condition, lock, ); \ |
|
} while (0) |
|
|
|
|
|
#define __wait_event_interruptible_lock_irq(wq_head, condition, lock, cmd) \ |
|
___wait_event(wq_head, condition, TASK_INTERRUPTIBLE, 0, 0, \ |
|
spin_unlock_irq(&lock); \ |
|
cmd; \ |
|
schedule(); \ |
|
spin_lock_irq(&lock)) |
|
|
|
/** |
|
* wait_event_interruptible_lock_irq_cmd - sleep until a condition gets true. |
|
* The condition is checked under the lock. This is expected to |
|
* be called with the lock taken. |
|
* @wq_head: the waitqueue to wait on |
|
* @condition: a C expression for the event to wait for |
|
* @lock: a locked spinlock_t, which will be released before cmd and |
|
* schedule() and reacquired afterwards. |
|
* @cmd: a command which is invoked outside the critical section before |
|
* sleep |
|
* |
|
* The process is put to sleep (TASK_INTERRUPTIBLE) until the |
|
* @condition evaluates to true or a signal is received. The @condition is |
|
* checked each time the waitqueue @wq_head is woken up. |
|
* |
|
* wake_up() has to be called after changing any variable that could |
|
* change the result of the wait condition. |
|
* |
|
* This is supposed to be called while holding the lock. The lock is |
|
* dropped before invoking the cmd and going to sleep and is reacquired |
|
* afterwards. |
|
* |
|
* The macro will return -ERESTARTSYS if it was interrupted by a signal |
|
* and 0 if @condition evaluated to true. |
|
*/ |
|
#define wait_event_interruptible_lock_irq_cmd(wq_head, condition, lock, cmd) \ |
|
({ \ |
|
int __ret = 0; \ |
|
if (!(condition)) \ |
|
__ret = __wait_event_interruptible_lock_irq(wq_head, \ |
|
condition, lock, cmd); \ |
|
__ret; \ |
|
}) |
|
|
|
/** |
|
* wait_event_interruptible_lock_irq - sleep until a condition gets true. |
|
* The condition is checked under the lock. This is expected |
|
* to be called with the lock taken. |
|
* @wq_head: the waitqueue to wait on |
|
* @condition: a C expression for the event to wait for |
|
* @lock: a locked spinlock_t, which will be released before schedule() |
|
* and reacquired afterwards. |
|
* |
|
* The process is put to sleep (TASK_INTERRUPTIBLE) until the |
|
* @condition evaluates to true or signal is received. The @condition is |
|
* checked each time the waitqueue @wq_head is woken up. |
|
* |
|
* wake_up() has to be called after changing any variable that could |
|
* change the result of the wait condition. |
|
* |
|
* This is supposed to be called while holding the lock. The lock is |
|
* dropped before going to sleep and is reacquired afterwards. |
|
* |
|
* The macro will return -ERESTARTSYS if it was interrupted by a signal |
|
* and 0 if @condition evaluated to true. |
|
*/ |
|
#define wait_event_interruptible_lock_irq(wq_head, condition, lock) \ |
|
({ \ |
|
int __ret = 0; \ |
|
if (!(condition)) \ |
|
__ret = __wait_event_interruptible_lock_irq(wq_head, \ |
|
condition, lock,); \ |
|
__ret; \ |
|
}) |
|
|
|
#define __wait_event_lock_irq_timeout(wq_head, condition, lock, timeout, state) \ |
|
___wait_event(wq_head, ___wait_cond_timeout(condition), \ |
|
state, 0, timeout, \ |
|
spin_unlock_irq(&lock); \ |
|
__ret = schedule_timeout(__ret); \ |
|
spin_lock_irq(&lock)); |
|
|
|
/** |
|
* wait_event_interruptible_lock_irq_timeout - sleep until a condition gets |
|
* true or a timeout elapses. The condition is checked under |
|
* the lock. This is expected to be called with the lock taken. |
|
* @wq_head: the waitqueue to wait on |
|
* @condition: a C expression for the event to wait for |
|
* @lock: a locked spinlock_t, which will be released before schedule() |
|
* and reacquired afterwards. |
|
* @timeout: timeout, in jiffies |
|
* |
|
* The process is put to sleep (TASK_INTERRUPTIBLE) until the |
|
* @condition evaluates to true or signal is received. The @condition is |
|
* checked each time the waitqueue @wq_head is woken up. |
|
* |
|
* wake_up() has to be called after changing any variable that could |
|
* change the result of the wait condition. |
|
* |
|
* This is supposed to be called while holding the lock. The lock is |
|
* dropped before going to sleep and is reacquired afterwards. |
|
* |
|
* The function returns 0 if the @timeout elapsed, -ERESTARTSYS if it |
|
* was interrupted by a signal, and the remaining jiffies otherwise |
|
* if the condition evaluated to true before the timeout elapsed. |
|
*/ |
|
#define wait_event_interruptible_lock_irq_timeout(wq_head, condition, lock, \ |
|
timeout) \ |
|
({ \ |
|
long __ret = timeout; \ |
|
if (!___wait_cond_timeout(condition)) \ |
|
__ret = __wait_event_lock_irq_timeout( \ |
|
wq_head, condition, lock, timeout, \ |
|
TASK_INTERRUPTIBLE); \ |
|
__ret; \ |
|
}) |
|
|
|
#define wait_event_lock_irq_timeout(wq_head, condition, lock, timeout) \ |
|
({ \ |
|
long __ret = timeout; \ |
|
if (!___wait_cond_timeout(condition)) \ |
|
__ret = __wait_event_lock_irq_timeout( \ |
|
wq_head, condition, lock, timeout, \ |
|
TASK_UNINTERRUPTIBLE); \ |
|
__ret; \ |
|
}) |
|
|
|
/* |
|
* Waitqueues which are removed from the waitqueue_head at wakeup time |
|
*/ |
|
void prepare_to_wait(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry, int state); |
|
bool prepare_to_wait_exclusive(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry, int state); |
|
long prepare_to_wait_event(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry, int state); |
|
void finish_wait(struct wait_queue_head *wq_head, struct wait_queue_entry *wq_entry); |
|
long wait_woken(struct wait_queue_entry *wq_entry, unsigned mode, long timeout); |
|
int woken_wake_function(struct wait_queue_entry *wq_entry, unsigned mode, int sync, void *key); |
|
int autoremove_wake_function(struct wait_queue_entry *wq_entry, unsigned mode, int sync, void *key); |
|
|
|
#define DEFINE_WAIT_FUNC(name, function) \ |
|
struct wait_queue_entry name = { \ |
|
.private = current, \ |
|
.func = function, \ |
|
.entry = LIST_HEAD_INIT((name).entry), \ |
|
} |
|
|
|
#define DEFINE_WAIT(name) DEFINE_WAIT_FUNC(name, autoremove_wake_function) |
|
|
|
#define init_wait(wait) \ |
|
do { \ |
|
(wait)->private = current; \ |
|
(wait)->func = autoremove_wake_function; \ |
|
INIT_LIST_HEAD(&(wait)->entry); \ |
|
(wait)->flags = 0; \ |
|
} while (0) |
|
|
|
typedef int (*task_call_f)(struct task_struct *p, void *arg); |
|
extern int task_call_func(struct task_struct *p, task_call_f func, void *arg); |
|
|
|
#endif /* _LINUX_WAIT_H */
|
|
|