118 lines
3.8 KiB
C
118 lines
3.8 KiB
C
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/* Copyright (C) 2000 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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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., 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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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <my_pthread.h>
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#include <my_list.h>
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struct st_thr_lock;
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extern ulong locks_immediate,locks_waited ;
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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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/* 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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extern ulong max_write_lock_count;
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extern my_bool thr_lock_inited;
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extern enum thr_lock_type thr_upgraded_concurrent_insert_lock;
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typedef struct st_thr_lock_data {
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pthread_t thread;
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struct st_thr_lock_data *next,**prev;
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struct st_thr_lock *lock;
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pthread_cond_t *cond;
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enum thr_lock_type type;
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ulong thread_id;
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void *status_param; /* Param to status functions */
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} THR_LOCK_DATA;
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struct st_lock_list {
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THR_LOCK_DATA *data,**last;
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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_wait;
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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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ulong write_lock_count;
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uint read_no_write_count;
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void (*get_status)(void*); /* 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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my_bool (*check_status)(void *);
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} THR_LOCK;
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my_bool init_thr_lock(void); /* Must be called once/thread */
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void thr_lock_init(THR_LOCK *lock);
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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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int thr_lock(THR_LOCK_DATA *data,enum thr_lock_type lock_type);
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void thr_unlock(THR_LOCK_DATA *data);
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int thr_multi_lock(THR_LOCK_DATA **data,uint count);
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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);
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void thr_abort_locks_for_thread(THR_LOCK *lock, pthread_t thread);
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void thr_print_locks(void); /* For debugging */
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my_bool thr_upgrade_write_delay_lock(THR_LOCK_DATA *data);
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my_bool thr_reschedule_write_lock(THR_LOCK_DATA *data);
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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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