Commit c206f3b9 authored by thek@adventure.(none)'s avatar thek@adventure.(none)
Browse files

Bug #30768 query cache patch for bug #21074 crashes on windows 

"pthread_mutex_trylock" isn't implemented correctly for the Windows platform.

This temporary patch reverts the patch for bug#21074 for Windows until
pthread_mutex_trylock is properly implemented.
parent 461f559a

sql/sql_cache.cc

+6 −0
Original line number Diff line number Diff line
@@ -1032,12 +1032,14 @@ Query_cache::send_result_to_client(THD *thd, char *sql, uint query_length) 
  Query_cache_block_table *block_table, *block_table_end;

  ulong tot_length;

  Query_cache_query_flags flags;

#ifndef __WIN__

  const uint spin_treshold= 50000;

  const double lock_time_treshold= 0.1; /* Time in seconds */

  uint spin_count= 0;

  int lock_status= 0;

  ulong new_time= 0;

  ulong stop_time= 0;

#endif



  DBUG_ENTER("Query_cache::send_result_to_client");
@@ -1085,6 +1087,9 @@ Query_cache::send_result_to_client(THD *thd, char *sql, uint query_length) 
    }

  }



#ifdef __WIN__

  STRUCT_LOCK(&structure_guard_mutex);

#else

  stop_time= my_clock()+(ulong)lock_time_treshold*CLOCKS_PER_SEC;

  while ((lock_status= pthread_mutex_trylock(&structure_guard_mutex)) == EBUSY

         && spin_count < spin_treshold
@@ -1107,6 +1112,7 @@ Query_cache::send_result_to_client(THD *thd, char *sql, uint query_length) 
    thd->lex->safe_to_cache_query= FALSE; 

    goto err;

  }

#endif



  if (query_cache_size == 0 || flush_in_progress)

  {