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Merge adventure.(none):/home/thek/Development/cpp/bug21074/my51-bug21074

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into  adventure.(none):/home/thek/Development/cpp/mysql-5.1-runtime
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thek@adventure.(none) 2007-05-23 12:55:11 +02:00
commit 0eaa615245
2 changed files with 43 additions and 51 deletions
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15
sql/set_var.cc
View File

@ -933,12 +933,19 @@ static void fix_net_retry_count(THD *thd __attribute__((unused)),
static void fix_query_cache_size(THD *thd, enum_var_type type)
{
#ifdef HAVE_QUERY_CACHE
ulong requested= query_cache_size;
query_cache.resize(query_cache_size);
if (requested != query_cache_size)
ulong new_cache_size= query_cache.resize(query_cache_size);
/*
Note: query_cache_size is a global variable reflecting the
requested cache size. See also query_cache_size_arg
*/
if (query_cache_size != new_cache_size)
push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
ER_WARN_QC_RESIZE, ER(ER_WARN_QC_RESIZE),
requested, query_cache_size);
query_cache_size, new_cache_size);
query_cache_size= new_cache_size;
#endif
}

79
sql/sql_cache.cc
View File

@ -632,7 +632,7 @@ void query_cache_insert(NET *net, const char *packet, ulong length)
DUMP(&query_cache);
BLOCK_LOCK_WR(query_block);
DBUG_PRINT("qcache", ("insert packet %lu bytes long",length));
DBUG_PRINT("qcache", ("insert parequestedcket %lu bytes long",length));
/*
On success STRUCT_UNLOCK(&query_cache.structure_guard_mutex) will be
@ -799,12 +799,26 @@ ulong Query_cache::resize(ulong query_cache_size_arg)
DBUG_PRINT("qcache", ("from %lu to %lu",query_cache_size,
query_cache_size_arg));
DBUG_ASSERT(initialized);
STRUCT_LOCK(&structure_guard_mutex);
free_cache();
query_cache_size= query_cache_size_arg;
::query_cache_size= init_cache();
while (flush_in_progress)
pthread_cond_wait(&COND_flush_finished, &structure_guard_mutex);
flush_in_progress= TRUE;
STRUCT_UNLOCK(&structure_guard_mutex);
DBUG_RETURN(::query_cache_size);
free_cache();
query_cache_size= query_cache_size_arg;
ulong new_query_cache_size= init_cache();
DBUG_EXECUTE("check_querycache",check_integrity(0););
STRUCT_LOCK(&structure_guard_mutex);
flush_in_progress= FALSE;
pthread_cond_signal(&COND_flush_finished);
STRUCT_UNLOCK(&structure_guard_mutex);
DBUG_RETURN(new_query_cache_size);
}
@ -1585,6 +1599,7 @@ ulong Query_cache::init_cache()
int align;
DBUG_ENTER("Query_cache::init_cache");
approx_additional_data_size = (sizeof(Query_cache) +
sizeof(gptr)*(def_query_hash_size+
def_table_hash_size));
@ -1763,58 +1778,28 @@ void Query_cache::make_disabled()
mem_bin_num= mem_bin_steps= 0;
queries_in_cache= 0;
first_block= 0;
total_blocks= 0;
tables_blocks= 0;
DBUG_VOID_RETURN;
}
/*
free_cache() - free all resources allocated by the cache.
SYNOPSIS
free_cache()
DESCRIPTION
This function frees all resources allocated by the cache. You
have to call init_cache() before using the cache again.
/**
@class Query_cache
@brief Free all resources allocated by the cache.
@details This function frees all resources allocated by the cache. You
have to call init_cache() before using the cache again. This function requires
the structure_guard_mutex to be locked.
*/
void Query_cache::free_cache()
{
DBUG_ENTER("Query_cache::free_cache");
if (query_cache_size > 0)
flush_cache();
/*
There may be two free_cache() calls in progress, because we
release 'structure_guard_mutex' in flush_cache(). When the second
flush_cache() wakes up from the wait on 'COND_flush_finished', the
first call to free_cache() has done its job. So we have to test
'query_cache_size > 0' the second time to see if the cache wasn't
reset by other thread, or if it was reset and was re-enabled then.
If the cache was reset, then we have nothing to do here.
*/
if (query_cache_size > 0)
{
#ifndef DBUG_OFF
if (bins[0].free_blocks == 0)
{
wreck(__LINE__,"no free memory found in (bins[0].free_blocks");
DBUG_VOID_RETURN;
}
#endif
/* Becasue we did a flush, all cache memory must be in one this block */
bins[0].free_blocks->destroy();
total_blocks--;
#ifndef DBUG_OFF
if (free_memory != query_cache_size)
DBUG_PRINT("qcache", ("free memory %lu (should be %lu)",
free_memory , query_cache_size));
#endif
my_free((gptr) cache, MYF(MY_ALLOW_ZERO_PTR));
make_disabled();
hash_free(&queries);
hash_free(&tables);
}
my_free((gptr) cache, MYF(MY_ALLOW_ZERO_PTR));
make_disabled();
hash_free(&queries);
hash_free(&tables);
DBUG_VOID_RETURN;
}