MDEV-7728 - Improve xid cache scalability by using lock-free hash

XID cache is now based on lock-free hash.
Also fixed lf_hash_destroy() to call alloc destructor.

Note that previous implementation had race condition when thread was accessing
XA owned by different thread. This new implementation doesn't fix it either.

1 files changed, 6 insertions, 1 deletions

diff --git a/include/lf.h b/include/lf.h
index 88024bc4d67..19bdafce647 100644
--- a/include/lf.h
+++ b/include/lf.h
@@ -117,7 +117,12 @@ uint lf_alloc_pool_count(LF_ALLOCATOR *allocator);
 #define lf_alloc_free(PINS, PTR)       lf_pinbox_free((PINS), (PTR))
 #define lf_alloc_get_pins(A)           lf_pinbox_get_pins(&(A)->pinbox)
 #define lf_alloc_put_pins(PINS)        lf_pinbox_put_pins(PINS)
-#define lf_alloc_direct_free(ALLOC, ADDR) my_free((ADDR))
+#define lf_alloc_direct_free(ALLOC, ADDR) \
+  do {                                    \
+    if ((ALLOC)->destructor)              \
+      (ALLOC)->destructor((uchar*) ADDR); \
+    my_free(ADDR);                        \
+  } while(0)
 
 void *lf_alloc_new(LF_PINS *pins);