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Allow mutexes to take a lock ordering enum at construction.

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This lets us specify whether and how mutexes of the same rank are allowed to be
acquired.  Currently, we only allow two polices (only a single mutex at a given
rank at a time, and mutexes acquired in ascending order), but we can plausibly
allow more (e.g. the "release uncontended mutexes before blocking").
This commit is contained in:
David Goldblatt 2017-05-15 15:38:15 -07:00 • committed by David Goldblatt
parent 6e62c62862
commit 26c792e61a
12 changed files with 75 additions and 30 deletions
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3
src/base.c
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@ -238,7 +238,8 @@ base_new(tsdn_t *tsdn, unsigned ind, extent_hooks_t *extent_hooks) {
&gap_size, base_size, base_alignment);
base->ind = ind;
atomic_store_p(&base->extent_hooks, extent_hooks, ATOMIC_RELAXED);
if (malloc_mutex_init(&base->mtx, "base", WITNESS_RANK_BASE)) {
if (malloc_mutex_init(&base->mtx, "base", WITNESS_RANK_BASE,
malloc_mutex_rank_exclusive)) {
base_unmap(extent_hooks, ind, block, block->size);
return NULL;
}