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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/extent.c
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@ -195,7 +195,8 @@ ph_gen(, extent_heap_, extent_heap_t, extent_t, ph_link, extent_snad_comp)
bool
extents_init(tsdn_t *tsdn, extents_t *extents, extent_state_t state,
bool delay_coalesce) {
if (malloc_mutex_init(&extents->mtx, "extents", WITNESS_RANK_EXTENTS)) {
if (malloc_mutex_init(&extents->mtx, "extents", WITNESS_RANK_EXTENTS,
malloc_mutex_rank_exclusive)) {
return true;
}
for (unsigned i = 0; i < NPSIZES+1; i++) {