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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/jemalloc.c
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@ -1142,10 +1142,13 @@ malloc_init_hard_needed(void)
}
#ifdef JEMALLOC_THREADED_INIT
if (malloc_initializer != NO_INITIALIZER && !IS_INITIALIZER) {
spin_t spinner;
/* Busy-wait until the initializing thread completes. */
spin_init(&spinner);
do {
malloc_mutex_unlock(TSDN_NULL, &init_lock);
CPU_SPINWAIT;
spin_adaptive(&spinner);
malloc_mutex_lock(TSDN_NULL, &init_lock);
} while (!malloc_initialized());
return (false);