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tc_contention_warning_reported transition to std::atomic

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This commit is contained in:
Sergey Vojtovich
2018-12-29 01:46:56 +04:00
parent 0f034e2e96
commit 3bdd93c10a
1 changed files with 3 additions and 3 deletions
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6
sql/table_cache.cc
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@ -57,7 +57,7 @@ ulong tdc_size; /**< Table definition cache threshold for LRU eviction. */
ulong tc_size; /**< Table cache threshold for LRU eviction. */ ulong tc_size; /**< Table cache threshold for LRU eviction. */
uint32 tc_instances; uint32 tc_instances;
uint32 tc_active_instances= 1; uint32 tc_active_instances= 1;
static uint32 tc_contention_warning_reported; static std::atomic<bool> tc_contention_warning_reported;
/** Data collections. */ /** Data collections. */
static LF_HASH tdc_hash; /**< Collection of TABLE_SHARE objects. */ static LF_HASH tdc_hash; /**< Collection of TABLE_SHARE objects. */
@ -187,8 +187,8 @@ struct Table_cache_instance
n_instances + 1); n_instances + 1);
} }
} }
else if (!my_atomic_fas32_explicit((int32*) &tc_contention_warning_reported, else if (!tc_contention_warning_reported.exchange(true,
1, MY_MEMORY_ORDER_RELAXED)) std::memory_order_relaxed))
{ {
sql_print_warning("Detected table cache mutex contention at instance %d: " sql_print_warning("Detected table cache mutex contention at instance %d: "
"%d%% waits. Additional table cache instance " "%d%% waits. Additional table cache instance "