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Merge tsmith@bk-internal.mysql.com:/home/bk/mysql-5.0-opt

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into  ramayana.hindu.god:/home/tsmith/m/bk/maint/50
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tsmith@ramayana.hindu.god
2007-08-01 18:39:13 -06:00
parent 0233a79321 181da56554
commit 534c3f325d
179 changed files with 1817 additions and 6476 deletions
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39
sql/handler.h
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@@ -537,6 +537,29 @@ class handler :public Sql_alloc
*/
virtual int rnd_init(bool scan) =0;
virtual int rnd_end() { return 0; }
/**
Is not invoked for non-transactional temporary tables.
Tells the storage engine that we intend to read or write data
from the table. This call is prefixed with a call to handler::store_lock()
and is invoked only for those handler instances that stored the lock.
Calls to rnd_init/index_init are prefixed with this call. When table
IO is complete, we call external_lock(F_UNLCK).
A storage engine writer should expect that each call to
::external_lock(F_[RD|WR]LOCK is followed by a call to
::external_lock(F_UNLCK). If it is not, it is a bug in MySQL.
The name and signature originate from the first implementation
in MyISAM, which would call fcntl to set/clear an advisory
lock on the data file in this method.
@param lock_type F_RDLCK, F_WRLCK, F_UNLCK
@return non-0 in case of failure, 0 in case of success.
When lock_type is F_UNLCK, the return value is ignored.
*/
virtual int external_lock(THD *thd, int lock_type) { return 0; }
public:
const handlerton *ht; /* storage engine of this handler */
@@ -577,6 +600,7 @@ public:
uint raid_type,raid_chunks;
FT_INFO *ft_handler;
enum {NONE=0, INDEX, RND} inited;
bool locked;
bool auto_increment_column_changed;
bool implicit_emptied; /* Can be !=0 only if HEAP */
const COND *pushed_cond;
@@ -589,10 +613,11 @@ public:
create_time(0), check_time(0), update_time(0),
key_used_on_scan(MAX_KEY), active_index(MAX_KEY),
ref_length(sizeof(my_off_t)), block_size(0),
raid_type(0), ft_handler(0), inited(NONE), implicit_emptied(0),
raid_type(0), ft_handler(0), inited(NONE),
locked(FALSE), implicit_emptied(0),
pushed_cond(NULL)
{}
virtual ~handler(void) { /* TODO: DBUG_ASSERT(inited == NONE); */ }
virtual ~handler(void) { DBUG_ASSERT(locked == FALSE); /* TODO: DBUG_ASSERT(inited == NONE); */ }
virtual handler *clone(MEM_ROOT *mem_root);
int ha_open(const char *name, int mode, int test_if_locked);
void adjust_next_insert_id_after_explicit_value(ulonglong nr);
@@ -626,6 +651,12 @@ public:
virtual const char *index_type(uint key_number) { DBUG_ASSERT(0); return "";}
int ha_external_lock(THD *thd, int lock_type)
{
DBUG_ENTER("ha_external_lock");
locked= lock_type != F_UNLCK;
DBUG_RETURN(external_lock(thd, lock_type));
}
int ha_index_init(uint idx)
{
DBUG_ENTER("ha_index_init");
@@ -718,7 +749,6 @@ public:
virtual int extra_opt(enum ha_extra_function operation, ulong cache_size)
{ return extra(operation); }
virtual int reset() { return extra(HA_EXTRA_RESET); }
virtual int external_lock(THD *thd, int lock_type) { return 0; }
virtual void unlock_row() {}
virtual int start_stmt(THD *thd, thr_lock_type lock_type) {return 0;}
/*
@@ -866,6 +896,9 @@ public:
/* lock_count() can be more than one if the table is a MERGE */
virtual uint lock_count(void) const { return 1; }
/**
Is not invoked for non-transactional temporary tables.
*/
virtual THR_LOCK_DATA **store_lock(THD *thd,
THR_LOCK_DATA **to,
enum thr_lock_type lock_type)=0;