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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/* For use with thr_locks */
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#ifndef DRIZZLED_THR_LOCK_H
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#define DRIZZLED_THR_LOCK_H
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#include <boost/thread/mutex.hpp>
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#include <boost/thread/shared_mutex.hpp>
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#include <boost/thread/condition_variable.hpp>
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* For use with thr_lock:s */
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#include <mysys/my_pthread.h>
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#include <mysys/definitions.h>
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extern uint32_t locks_immediate,locks_waited ;
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extern pthread_mutex_t THR_LOCK_lock;
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extern uint64_t max_write_lock_count;
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extern uint64_t table_lock_wait_timeout;
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enum thr_lock_type { TL_IGNORE=-1,
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TL_READ_WITH_SHARED_LOCKS,
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/* READ, Don't allow concurrent insert */
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Write lock, but allow other threads to read / write.
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Used by BDB tables in MySQL to mark that someone is
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reading/writing to the table.
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Write lock, but allow other threads to read.
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Used by ALTER TABLE in MySQL to allow readers
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to use the table until ALTER TABLE is finished.
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WRITE lock used by concurrent insert. Will allow
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READ, if one could use concurrent insert on table.
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TL_WRITE_CONCURRENT_INSERT,
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parser only! Late bound low_priority flag.
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At open_tables() becomes thd->update_lock_default.
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/* Normal WRITE lock */
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/* Abort new lock request with an error */
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enum enum_thr_lock_result { THR_LOCK_SUCCESS= 0, THR_LOCK_ABORTED= 1,
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THR_LOCK_WAIT_TIMEOUT= 2, THR_LOCK_DEADLOCK= 3 };
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extern bool thr_lock_inited;
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extern enum thr_lock_type thr_upgraded_concurrent_insert_lock;
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A description of the thread which owns the lock. The address
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of an instance of this structure is used to uniquely identify the thread.
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typedef struct st_thr_lock_info
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my_thread_id thread_id;
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uint32_t n_cursors;
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Lock owner identifier. Globally identifies the lock owner within the
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structure is used as id.
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typedef struct st_thr_lock_owner
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THR_LOCK_INFO *info;
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struct THR_LOCK_DATA;
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struct THR_LOCK_DATA {
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typedef struct st_thr_lock_data {
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THR_LOCK_OWNER *owner;
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struct THR_LOCK_DATA *next,**prev;
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struct THR_LOCK *lock;
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boost::condition_variable_any *cond;
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struct st_thr_lock_data *next,**prev;
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struct st_thr_lock *lock;
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enum thr_lock_type type;
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void *status_param; /* Param to status functions */
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void init(THR_LOCK *lock,
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void *status_param= NULL);
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/* A helper type for transactional locking. */
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struct st_table_lock_info
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enum thr_lock_type lock_type;
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bool lock_transactional;
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struct st_lock_list {
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THR_LOCK_DATA *data,**last;
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typedef struct st_thr_lock {
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pthread_mutex_t mutex;
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struct st_lock_list read_wait;
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struct st_lock_list read;
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struct st_lock_list write_wait;
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/* write_lock_count is incremented for write locks and reset on read locks */
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uint32_t write_lock_count;
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uint32_t read_no_write_count;
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read_no_write_count(0)
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bool abort_locks_for_thread(uint64_t thread);
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boost::mutex *native_handle()
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void (*get_status)(void*, int); /* When one gets a lock */
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void (*copy_status)(void*,void*);
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void (*update_status)(void*); /* Before release of write */
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void (*restore_status)(void*); /* Before release of read */
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bool (*check_status)(void *);
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bool init_thr_lock(void); /* Must be called once/thread */
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#define thr_lock_owner_init(owner, info_arg) (owner)->info= (info_arg)
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void thr_lock_info_init(THR_LOCK_INFO *info);
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void thr_lock_init(THR_LOCK *lock);
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enum enum_thr_lock_result thr_multi_lock(Session &session, THR_LOCK_DATA **data,
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void thr_lock_delete(THR_LOCK *lock);
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void thr_lock_data_init(THR_LOCK *lock,THR_LOCK_DATA *data,
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enum enum_thr_lock_result thr_lock(THR_LOCK_DATA *data,
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THR_LOCK_OWNER *owner,
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enum thr_lock_type lock_type);
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void thr_unlock(THR_LOCK_DATA *data);
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enum enum_thr_lock_result thr_multi_lock(THR_LOCK_DATA **data,
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uint32_t count, THR_LOCK_OWNER *owner);
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void thr_multi_unlock(THR_LOCK_DATA **data,uint32_t count);
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} /* namespace drizzled */
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#endif /* DRIZZLED_THR_LOCK_H */
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void thr_abort_locks(THR_LOCK *lock, bool upgrade_lock);
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bool thr_abort_locks_for_thread(THR_LOCK *lock, my_thread_id thread);
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bool thr_upgrade_write_delay_lock(THR_LOCK_DATA *data);
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void thr_downgrade_write_lock(THR_LOCK_DATA *data,
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enum thr_lock_type new_lock_type);
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bool thr_reschedule_write_lock(THR_LOCK_DATA *data);
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#endif /* _thr_lock_h */