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pandora-build v0.100 - Fixes several bugs found by cb1kenobi. Add several thoughts from folks at LCA.

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drizzled/thr_lock.h
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   along with this program; if not, write to the Free Software
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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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#ifndef _thr_lock_h
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#define _thr_lock_h
 
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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 <pthread.h>
 
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#ifdef  __cplusplus
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extern "C" {
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#endif
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#include <mysys/my_pthread.h>
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#include <mysys/my_list.h>
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struct st_thr_lock;
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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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extern bool thr_lock_inited;
 
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enum thr_lock_type { TL_IGNORE=-1,
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                     TL_UNLOCK,                 /* UNLOCK ANY LOCK */
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                     TL_READ,                   /* Read lock */
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                     TL_READ_WITH_SHARED_LOCKS,
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                     /* High prior. than TL_WRITE. Allow concurrent insert */
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                     TL_READ_HIGH_PRIORITY,
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                     /* READ, Don't allow concurrent insert */
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                     TL_READ_NO_INSERT,
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                     /* 
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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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                      */
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                     TL_WRITE_ALLOW_WRITE,
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                     /*
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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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                     */
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                     TL_WRITE_ALLOW_READ,
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                     /*
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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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                     */
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                     TL_WRITE_CONCURRENT_INSERT,
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                     /* Write used by INSERT DELAYED.  Allows READ locks */
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                     TL_WRITE_DELAYED,
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                     /* 
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                       parser only! Late bound low_priority flag. 
 
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                     /* UNLOCK ANY LOCK */
 
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                     TL_UNLOCK,
 
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                     /* Read lock */
 
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                     TL_READ,
 
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                     TL_READ_WITH_SHARED_LOCKS,
 
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                     /* READ, Don't allow concurrent insert */
 
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                     TL_READ_NO_INSERT,
 
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                     /*
 
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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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                     */
 
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                     TL_WRITE_ALLOW_WRITE,
 
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                     /*
 
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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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                     */
 
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                     TL_WRITE_ALLOW_READ,
 
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                     /*
 
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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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                     */
 
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                     TL_WRITE_CONCURRENT_INSERT,
 
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                     /*
 
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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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                     */
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                     TL_WRITE_DEFAULT,
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                     /* WRITE lock that has lower priority than TL_READ */
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                     TL_WRITE_LOW_PRIORITY,
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                     /* Normal WRITE lock */
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                     TL_WRITE,
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                     /* Abort new lock request with an error */
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                     TL_WRITE_ONLY};
 
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                     /* Normal WRITE lock */
 
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                     TL_WRITE,
 
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                     /* Abort new lock request with an error */
 
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                     TL_WRITE_ONLY};
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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 ulong max_write_lock_count;
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extern ulong table_lock_wait_timeout;
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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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/*
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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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{
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  pthread_t thread;
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  my_thread_id thread_id;
 
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  uint64_t thread_id;
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  uint32_t n_cursors;
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} THR_LOCK_INFO;
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};
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typedef struct st_thr_lock {
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  LIST list;
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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;
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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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  uint read_no_write_count;
 
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  uint32_t read_no_write_count;
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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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} THR_LOCK;
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extern LIST *thr_lock_thread_list;
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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_delete(THR_LOCK *lock);
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void thr_lock_data_init(THR_LOCK *lock,THR_LOCK_DATA *data,
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                        void *status_param);
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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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                                         uint count, THR_LOCK_OWNER *owner);
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void thr_multi_unlock(THR_LOCK_DATA **data,uint count);
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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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                                         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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void thr_abort_locks(THR_LOCK *lock);
 
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bool thr_abort_locks_for_thread(THR_LOCK *lock, uint64_t thread);
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#ifdef  __cplusplus
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}
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#endif
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#endif /* _thr_lock_h */
 
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#endif /* DRIZZLED_THR_LOCK_H */