1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA */
/* For use with thr_lock:s */
#ifndef _thr_lock_h
#define _thr_lock_h
#ifdef __cplusplus
extern "C" {
#endif
#include <my_pthread.h>
#include <my_list.h>
struct st_thr_lock;
enum thr_lock_type { TL_IGNORE=-1,
TL_UNLOCK, TL_READ, TL_READ_HIGH_PRIORITY,
TL_READ_NO_INSERT,
TL_WRITE_ALLOW_WRITE, TL_WRITE_ALLOW_READ,
TL_WRITE_CONCURRENT_INSERT,
TL_WRITE_DELAYED, TL_WRITE_LOW_PRIORITY, TL_WRITE,
TL_WRITE_ONLY};
extern ulong max_write_lock_count;
extern my_bool thr_lock_inited;
typedef struct st_thr_lock_data {
pthread_t thread;
struct st_thr_lock_data *next,**prev;
struct st_thr_lock *lock;
pthread_cond_t *cond;
enum thr_lock_type type;
ulong thread_id;
void *status_param; /* Param to status functions */
} THR_LOCK_DATA;
struct st_lock_list {
THR_LOCK_DATA *data,**last;
};
typedef struct st_thr_lock {
LIST list;
pthread_mutex_t mutex;
struct st_lock_list read_wait;
struct st_lock_list read;
struct st_lock_list write_wait;
struct st_lock_list write;
/* write_lock_count is incremented for write locks and reset on read locks */
ulong write_lock_count;
uint read_no_write_count;
void (*get_status)(void*); /* When one gets a lock */
void (*copy_status)(void*,void*);
void (*update_status)(void*); /* Before release of write */
my_bool (*check_status)(void *);
} THR_LOCK;
my_bool init_thr_lock(void); /* Must be called once/thread */
void thr_lock_init(THR_LOCK *lock);
void thr_lock_delete(THR_LOCK *lock);
void thr_lock_data_init(THR_LOCK *lock,THR_LOCK_DATA *data,
void *status_param);
int thr_lock(THR_LOCK_DATA *data,enum thr_lock_type lock_type);
void thr_unlock(THR_LOCK_DATA *data);
int thr_multi_lock(THR_LOCK_DATA **data,uint count);
void thr_multi_unlock(THR_LOCK_DATA **data,uint count);
void thr_abort_locks(THR_LOCK *lock);
void thr_print_locks(void); /* For debugging */
my_bool thr_upgrade_write_delay_lock(THR_LOCK_DATA *data);
my_bool thr_reschedule_write_lock(THR_LOCK_DATA *data);
#ifdef __cplusplus
}
#endif
#endif /* _thr_lock_h */
|
