Function report |
Source Code:kernel\locking\osq_lock.c |
Create Date:2022-07-28 09:51:16 |
Last Modify:2020-03-12 14:18:49 | Copyright©Brick |
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Annotation kernel can get tool activity | Download SCCT | Chinese |
Name:Get a stable @node->next pointer, either for unlock() or unqueue() purposes.* Can return NULL in case we were the last queued and we updated @lock instead.
Proto:static inline struct optimistic_spin_node *osq_wait_next(struct optimistic_spin_queue *lock, struct optimistic_spin_node *node, struct optimistic_spin_node *prev)
Type:struct optimistic_spin_node
Parameter:
Type | Parameter | Name |
---|---|---|
struct optimistic_spin_queue * | lock | |
struct optimistic_spin_node * | node | |
struct optimistic_spin_node * | prev |
46 | struct optimistic_spin_node * next = NULL |
47 | curr = We use the value 0 to represent "no CPU", thus the encoded value* will be the CPU number incremented by 1. |
55 | old = If prev Then coded CPU # + 1 value Else OSQ_UNLOCKED_VAL |
57 | cycle |
65 | Break |
78 | If next Then |
84 | cpu_relax() |
87 | Return next |
Name | Describe |
---|---|
osq_lock | |
osq_unlock |
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