Boost Unordered Translation (zh_Hans)/Doc / Modules / Root / Pages / Structures (adoc) — Chinese (Simplified Han script) @ Boost-Weblate

English

This algorithm has very low contention both at the lookup and actual insertion phases in exchange for the possibility that computations have to be started over if some other thread interferes in the process by performing a succesful insertion beginning at the same group. In practice, the start-over frequency is extremely small, measured in the range of parts per million for some of our benchmarks.

37 :150
	English A read-write spinlock for synchronized access to any element in the group. An atomic _insertion counter_ used for optimistic insertion as described below.
	Chinese (Simplified Han script) - 一个读写自旋锁，用于同步对组内任何元素的访问。 - 一个原子 _插入计数器_，用于下文所述的乐观插入。 53/1600 · 160 Needs editing
38 :154
	English By using atomic operations to access the group metadata, lookup is (group-level) lock-free up to the point where an actual comparison needs to be done with an element that has been previously SIMD-matched: only then is the group's spinlock used.
	Chinese (Simplified Han script) 通过使用原子操作访问组元数据，查找操作在（组级别）上是无锁的，直到需要与实际进行 SIMD 匹配的元素进行比较时才会使用组的自旋锁。 66/2450 · 245 Needs editing
39 :158
	English Insertion uses the following _optimistic algorithm_:
	Chinese (Simplified Han script) 插入操作使用以下 _乐观算法_： 16/520 · 52 Needs editing
40 :160
	English The value of the insertion counter for the initial group in the probe
	Chinese (Simplified Han script) 探测起始组的插入计数器值 12/690 · 69 Needs editing
41 :161
	English sequence is locally recorded (let's call this value `c0`).
	Chinese (Simplified Han script) 序列会被本地记录（我们称此值为 `c0`）。 22/580 · 58 Needs editing
42 :162
	English Lookup is as described above. If lookup finds no equivalent element,
	Chinese (Simplified Han script) 查找过程如上所述。如果查找未找到等效元素， 21/680 · 68 Needs editing
43 :163
	English search for an available slot for insertion successively locks/unlocks each group in the probing sequence.
	Chinese (Simplified Han script) 则会依次对探测序列中的每个组进行加锁/解锁，以搜索可用于插入的空槽位。 35/1050 · 105 Needs editing
44 :165
	English When an available slot is located, it is preemptively occupied (its
	Chinese (Simplified Han script) 当定位到一个可用槽位时，该槽位会被预先占用（其 23/670 · 67 Needs editing
45 :166
	English reduced hash value is set) and the insertion counter is atomically incremented: if no other thread has incremented the counter during the whole operation (which is checked by comparing with `c0`), then we're good to go and complete the insertion, otherwise we roll back and start over.
	Chinese (Simplified Han script) 缩减哈希值被设置），并且插入计数器被原子地递增：如果在整个操作过程中没有其他线程递增该计数器（通过与 `c0` 比较来检查），则插入操作可以顺利完成，否则将回滚并重新开始。 86/2850 · 285 Needs editing
46 :172
	English This algorithm has very low contention both at the lookup and actual insertion phases in exchange for the possibility that computations have to be started over if some other thread interferes in the process by performing a succesful insertion beginning at the same group. In practice, the start-over frequency is extremely small, measured in the range of parts per million for some of our benchmarks.
	Chinese (Simplified Han script) 该算法在查找和实际插入阶段都具有非常低的争用，代价是如果其他线程在同一个组上成功执行了插入操作，则当前计算可能需要重新开始。在实际应用中，重新开始的频率极低，根据我们的一些基准测试，其量级在百万分之一以内。 103/4000 · 400 Needs editing
47 :179
	English For more information on implementation rationale, read the xref:rationale.adoc#rationale_concurrent_containers[corresponding section].
	Chinese (Simplified Han script) 如需了解实现原理的更多内容，请参阅 xref:rationale.adoc#rationale_concurrent_containers [对应章节]。 77/1340 · 134 Needs editing
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