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Add locks for sequence's to ensure that there is only one writer or many readers

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This is needed for MyISAM and other storage engines which normally
relies on THR_LOCK's to ensure that one is not writing the same block
one could be reading from.
This commit is contained in:
Monty
2017-05-29 16:08:11 +03:00
parent d7e3120da8
commit 7e5bd1500f
6 changed files with 97 additions and 48 deletions
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18
sql/sql_sequence.h
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@@ -40,7 +40,7 @@ class sequence_definition :public Sql_alloc
public:
sequence_definition():
min_value(1), max_value(LONGLONG_MAX-1), start(1), increment(1),
cache(1000), round(0), cycle(0), used_fields(0)
cache(1000), round(0), restart(0), cycle(0), used_fields(0)
{}
longlong reserved_until;
longlong min_value;
@@ -49,9 +49,9 @@ public:
longlong increment;
longlong cache;
ulonglong round;
longlong restart; // alter sequence restart value
bool cycle;
uint used_fields; // Which fields where used in CREATE
longlong restart; // alter sequence restart value
bool check_and_adjust(bool set_reserved_until);
void store_fields(TABLE *table);
@@ -93,14 +93,10 @@ public:
~SEQUENCE();
int read_initial_values(TABLE *table);
int read_stored_values();
void lock()
{
mysql_mutex_lock(&mutex);
}
void unlock()
{
mysql_mutex_unlock(&mutex);
}
void write_lock(TABLE *table);
void write_unlock(TABLE *table);
void read_lock(TABLE *table);
void read_unlock(TABLE *table);
void copy(sequence_definition *seq)
{
sequence_definition::operator= (*seq);
@@ -135,7 +131,7 @@ public:
private:
TABLE *table;
mysql_mutex_t mutex;
mysql_rwlock_t mutex;
};