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Add/use adaptive spinning.

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Add spin_t and spin_{init,adaptive}(), which provide a simple
abstraction for adaptive spinning.

Adaptively spin during busy waits in bootstrapping and rtree node
initialization.
This commit is contained in:
Jason Evans 2016-10-13 14:47:50 -07:00
parent 9acd5cf178
commit e5effef428
6 changed files with 66 additions and 2 deletions
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5
src/rtree.c
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@ -136,12 +136,15 @@ rtree_node_init(tsdn_t *tsdn, rtree_t *rtree, unsigned level,
rtree_elm_t *node;
if (atomic_cas_p((void **)elmp, NULL, RTREE_NODE_INITIALIZING)) {
spin_t spinner;
/*
* Another thread is already in the process of initializing.
* Spin-wait until initialization is complete.
*/
spin_init(&spinner);
do {
CPU_SPINWAIT;
spin_adaptive(&spinner);
node = atomic_read_p((void **)elmp);
} while (node == RTREE_NODE_INITIALIZING);
} else {