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Functions |
| void | init_waitqueue_head (wait_queue_head_t *q) |
| | EXPORT_SYMBOL (init_waitqueue_head) |
| void | add_wait_queue (wait_queue_head_t *q, wait_queue_t *wait) |
| | EXPORT_SYMBOL (add_wait_queue) |
| void | add_wait_queue_exclusive (wait_queue_head_t *q, wait_queue_t *wait) |
| | EXPORT_SYMBOL (add_wait_queue_exclusive) |
| void | remove_wait_queue (wait_queue_head_t *q, wait_queue_t *wait) |
| | EXPORT_SYMBOL (remove_wait_queue) |
| void | prepare_to_wait (wait_queue_head_t *q, wait_queue_t *wait, int state) |
| | EXPORT_SYMBOL (prepare_to_wait) |
| void | prepare_to_wait_exclusive (wait_queue_head_t *q, wait_queue_t *wait, int state) |
| | EXPORT_SYMBOL (prepare_to_wait_exclusive) |
| void | finish_wait (wait_queue_head_t *q, wait_queue_t *wait) |
| | EXPORT_SYMBOL (finish_wait) |
| void | abort_exclusive_wait (wait_queue_head_t *q, wait_queue_t *wait, unsigned int mode, void *key) |
| | EXPORT_SYMBOL (abort_exclusive_wait) |
| int | autoremove_wake_function (wait_queue_t *wait, unsigned mode, int sync, void *key) |
| | EXPORT_SYMBOL (autoremove_wake_function) |
| int | wake_bit_function (wait_queue_t *wait, unsigned mode, int sync, void *arg) |
| | EXPORT_SYMBOL (wake_bit_function) |
| int __sched | __wait_on_bit (wait_queue_head_t *wq, struct wait_bit_queue *q, int(*action)(void *), unsigned mode) |
| | EXPORT_SYMBOL (__wait_on_bit) |
| int __sched | out_of_line_wait_on_bit (void *word, int bit, int(*action)(void *), unsigned mode) |
| | EXPORT_SYMBOL (out_of_line_wait_on_bit) |
| int __sched | __wait_on_bit_lock (wait_queue_head_t *wq, struct wait_bit_queue *q, int(*action)(void *), unsigned mode) |
| | EXPORT_SYMBOL (__wait_on_bit_lock) |
| int __sched | out_of_line_wait_on_bit_lock (void *word, int bit, int(*action)(void *), unsigned mode) |
| | EXPORT_SYMBOL (out_of_line_wait_on_bit_lock) |
| void | __wake_up_bit (wait_queue_head_t *wq, void *word, int bit) |
| | EXPORT_SYMBOL (__wake_up_bit) |
| void | wake_up_bit (void *word, int bit) |
| | wake_up_bit - wake up a waiter on a bit : the word being waited on, a kernel virtual address : the bit of the word being waited on
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| | EXPORT_SYMBOL (wake_up_bit) |
| wait_queue_head_t * | bit_waitqueue (void *word, int bit) |
| | EXPORT_SYMBOL (bit_waitqueue) |
| void wake_up_bit |
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void * |
word, |
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int |
bit | |
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wake_up_bit - wake up a waiter on a bit : the word being waited on, a kernel virtual address : the bit of the word being waited on
There is a standard hashed waitqueue table for generic use. This is the part of the hashtable's accessor API that wakes up waiters on a bit. For instance, if one were to have waiters on a bitflag, one would call wake_up_bit() after clearing the bit.
In order for this to function properly, as it uses waitqueue_active() internally, some kind of memory barrier must be done prior to calling this. Typically, this will be smp_mb__after_clear_bit(), but in some cases where bitflags are manipulated non-atomically under a lock, one may need to use a less regular barrier, such fs/inode.c's smp_mb(), because spin_unlock() does not guarantee a memory barrier.
Definition at line 282 of file wait.c.
