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Convert rtree code to use C11 atomics

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In the process, I changed the implementation of rtree_elm_acquire so that it
won't even try to CAS if its initial read (getting the extent + lock bit)
indicates that the CAS is doomed to fail.  This can significantly improve
performance under contention.
This commit is contained in:
David Goldblatt
2017-03-09 14:49:32 -08:00
committed by David Goldblatt
parent 3a2b183d5f
commit 21a68e2d22
3 changed files with 62 additions and 39 deletions
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15
include/jemalloc/internal/rtree_structs.h
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@@ -2,11 +2,8 @@
#define JEMALLOC_INTERNAL_RTREE_STRUCTS_H
struct rtree_elm_s {
union {
void *pun;
rtree_elm_t *child;
extent_t *extent;
};
/* Either "rtree_elm_t *child;" or "extent_t *extent;". */
atomic_p_t child_or_extent;
};
struct rtree_elm_witness_s {
@@ -41,11 +38,9 @@ struct rtree_ctx_s {
};
struct rtree_s {
union {
void *root_pun;
rtree_elm_t *root;
};
malloc_mutex_t init_lock;
/* An rtree_elm_t *. */
atomic_p_t root;
malloc_mutex_t init_lock;
};
#endif /* JEMALLOC_INTERNAL_RTREE_STRUCTS_H */