diff --git a/mysql-test/r/query_cache_debug.result b/mysql-test/r/query_cache_debug.result index 30996e5e86b..50a3a02fe4d 100644 --- a/mysql-test/r/query_cache_debug.result +++ b/mysql-test/r/query_cache_debug.result @@ -123,16 +123,20 @@ SET DEBUG_SYNC="now WAIT_FOR parked1_1"; ** On THD2: Insert a result into the cache. This attempt will be blocked ** because of a debug hook placed just before the mutex lock after which ** the first part of the result set is written. -SET DEBUG_SYNC="wait_in_query_cache_insert SIGNAL parked2 WAIT_FOR go2"; +SET DEBUG_SYNC="wait_in_query_cache_insert SIGNAL parked2 WAIT_FOR go2 EXECUTE 1"; SELECT SQL_CACHE * FROM t2 UNION SELECT * FROM t3; +=================================== Connection default +** Assert that the SELECT-stmt thread reaches the sync point. +SET DEBUG_SYNC="now WAIT_FOR parked2"; +** +** =================================== Connection thd3 ** On THD3: Insert another result into the cache and block on the same ** debug hook. -SET DEBUG_SYNC="wait_in_query_cache_insert SIGNAL parked3 WAIT_FOR go3"; -SELECT SQL_CACHE * FROM t4 UNION SELECT * FROM t5;; +SET DEBUG_SYNC="wait_in_query_cache_insert SIGNAL parked3 WAIT_FOR go3 EXECUTE 1"; +SELECT SQL_CACHE * FROM t4 UNION SELECT * FROM t5; =================================== Connection default -** Assert that the two SELECT-stmt threads to reach the hook. -SET DEBUG_SYNC="now WAIT_FOR parked2"; +** Assert that the SELECT-stmt thread reaches the sync point. SET DEBUG_SYNC="now WAIT_FOR parked3"; ** ** diff --git a/mysql-test/t/query_cache_debug.test b/mysql-test/t/query_cache_debug.test index 77e714aa6f5..2f85813d1ef 100644 --- a/mysql-test/t/query_cache_debug.test +++ b/mysql-test/t/query_cache_debug.test @@ -170,20 +170,26 @@ connection thd2; --echo ** On THD2: Insert a result into the cache. This attempt will be blocked --echo ** because of a debug hook placed just before the mutex lock after which --echo ** the first part of the result set is written. -SET DEBUG_SYNC="wait_in_query_cache_insert SIGNAL parked2 WAIT_FOR go2"; +SET DEBUG_SYNC="wait_in_query_cache_insert SIGNAL parked2 WAIT_FOR go2 EXECUTE 1"; --send SELECT SQL_CACHE * FROM t2 UNION SELECT * FROM t3 +connection default; +--echo =================================== Connection default +--echo ** Assert that the SELECT-stmt thread reaches the sync point. +SET DEBUG_SYNC="now WAIT_FOR parked2"; +--echo ** +--echo ** + connection thd3; --echo =================================== Connection thd3 --echo ** On THD3: Insert another result into the cache and block on the same --echo ** debug hook. -SET DEBUG_SYNC="wait_in_query_cache_insert SIGNAL parked3 WAIT_FOR go3"; ---send SELECT SQL_CACHE * FROM t4 UNION SELECT * FROM t5; +SET DEBUG_SYNC="wait_in_query_cache_insert SIGNAL parked3 WAIT_FOR go3 EXECUTE 1"; +--send SELECT SQL_CACHE * FROM t4 UNION SELECT * FROM t5 connection default; --echo =================================== Connection default ---echo ** Assert that the two SELECT-stmt threads to reach the hook. -SET DEBUG_SYNC="now WAIT_FOR parked2"; +--echo ** Assert that the SELECT-stmt thread reaches the sync point. SET DEBUG_SYNC="now WAIT_FOR parked3"; --echo ** --echo ** diff --git a/sql/sql_cache.cc b/sql/sql_cache.cc index 8c3abdbf1b0..9876c46bbb3 100644 --- a/sql/sql_cache.cc +++ b/sql/sql_cache.cc @@ -384,6 +384,22 @@ TODO list: #endif +/** + Macro that executes the requested action at a synchronization point + only if the thread has a associated THD session. +*/ +#if defined(ENABLED_DEBUG_SYNC) +#define QC_DEBUG_SYNC(name) \ + do { \ + THD *thd= current_thd; \ + if (thd) \ + DEBUG_SYNC(thd, name); \ + } while (0) +#else +#define QC_DEBUG_SYNC(name) +#endif + + /** Thread state to be used when the query cache lock needs to be acquired. Sets the thread state name in the constructor, resets on destructor. @@ -879,7 +895,7 @@ Query_cache::insert(Query_cache_tls *query_cache_tls, if (is_disabled() || query_cache_tls->first_query_block == NULL) DBUG_VOID_RETURN; - DEBUG_SYNC(current_thd, "wait_in_query_cache_insert"); + QC_DEBUG_SYNC("wait_in_query_cache_insert"); if (try_lock()) DBUG_VOID_RETURN; @@ -1975,7 +1991,7 @@ void Query_cache::flush() if (is_disabled()) DBUG_VOID_RETURN; - DEBUG_SYNC(current_thd, "wait_in_query_cache_flush1"); + QC_DEBUG_SYNC("wait_in_query_cache_flush1"); lock_and_suspend(); if (query_cache_size > 0) @@ -2315,7 +2331,7 @@ void Query_cache::free_cache() void Query_cache::flush_cache() { - DEBUG_SYNC(current_thd, "wait_in_query_cache_flush2"); + QC_DEBUG_SYNC("wait_in_query_cache_flush2"); my_hash_reset(&queries); while (queries_blocks != 0)