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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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6
src/jemalloc.c
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@@ -235,7 +235,8 @@ _init_init_lock(void) {
* doing anything.
*/
if (!init_lock_initialized) {
malloc_mutex_init(&init_lock, "init", WITNESS_RANK_INIT);
malloc_mutex_init(&init_lock, "init", WITNESS_RANK_INIT,
malloc_mutex_rank_exclusive);
}
init_lock_initialized = true;
}
@@ -1237,7 +1238,8 @@ malloc_init_hard_a0_locked() {
if (tcache_boot(TSDN_NULL)) {
return true;
}
if (malloc_mutex_init(&arenas_lock, "arenas", WITNESS_RANK_ARENAS)) {
if (malloc_mutex_init(&arenas_lock, "arenas", WITNESS_RANK_ARENAS,
malloc_mutex_rank_exclusive)) {
return true;
}
/*