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
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
/* 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 */
/*
** Functions to handle initializating and allocationg of all mysys & debug
** thread variables.
*/
#include "mysys_priv.h"
#include <m_string.h>
#ifdef THREAD
#ifdef USE_TLS
pthread_key(struct st_my_thread_var*, THR_KEY_mysys);
#else
pthread_key(struct st_my_thread_var, THR_KEY_mysys);
#endif
pthread_mutex_t THR_LOCK_malloc,THR_LOCK_open,THR_LOCK_keycache,
THR_LOCK_lock,THR_LOCK_isam,THR_LOCK_myisam,THR_LOCK_heap,
THR_LOCK_net, THR_LOCK_charset;
#ifndef HAVE_LOCALTIME_R
pthread_mutex_t LOCK_localtime_r;
#endif
#ifdef __WIN__
pthread_mutex_t THR_LOCK_thread;
#endif
/* FIXME Note. TlsAlloc does not set an auto destructor, so
the function my_thread_global_free must be called from
somewhere before final exit of the library */
my_bool my_thread_global_init(void)
{
if (pthread_key_create(&THR_KEY_mysys,free))
{
fprintf(stderr,"Can't initialize threads: error %d\n",errno);
exit(1);
}
pthread_mutex_init(&THR_LOCK_malloc,NULL);
pthread_mutex_init(&THR_LOCK_open,NULL);
pthread_mutex_init(&THR_LOCK_keycache,NULL);
pthread_mutex_init(&THR_LOCK_lock,NULL);
pthread_mutex_init(&THR_LOCK_isam,NULL);
pthread_mutex_init(&THR_LOCK_myisam,NULL);
pthread_mutex_init(&THR_LOCK_heap,NULL);
pthread_mutex_init(&THR_LOCK_net,NULL);
pthread_mutex_init(&THR_LOCK_charset,NULL);
#ifdef __WIN__
pthread_mutex_init(&THR_LOCK_thread,NULL);
#endif
#ifndef HAVE_LOCALTIME_R
pthread_mutex_init(&LOCK_localtime_r,NULL);
#endif
return my_thread_init();
}
void my_thread_global_end(void)
{
#if defined(USE_TLS)
(void) TlsFree(THR_KEY_mysys);
#endif
}
static long thread_id=0;
my_bool my_thread_init(void)
{
struct st_my_thread_var *tmp;
pthread_mutex_lock(&THR_LOCK_lock);
#if !defined(__WIN__) || defined(USE_TLS)
if (my_pthread_getspecific(struct st_my_thread_var *,THR_KEY_mysys))
{
pthread_mutex_unlock(&THR_LOCK_lock);
return 0; /* Safequard */
}
/* We must have many calloc() here because these are freed on
pthread_exit */
if (!(tmp=(struct st_my_thread_var *)
calloc(1,sizeof(struct st_my_thread_var))))
{
pthread_mutex_unlock(&THR_LOCK_lock);
return 1;
}
pthread_setspecific(THR_KEY_mysys,tmp);
#else
if (THR_KEY_mysys.id) /* Allready initialized */
{
pthread_mutex_unlock(&THR_LOCK_lock);
return 0;
}
tmp= &THR_KEY_mysys;
#endif
tmp->id= ++thread_id;
pthread_mutex_init(&tmp->mutex,NULL);
pthread_cond_init(&tmp->suspend, NULL);
pthread_mutex_unlock(&THR_LOCK_lock);
return 0;
}
void my_thread_end(void)
{
struct st_my_thread_var *tmp=my_thread_var;
if (tmp)
{
#if !defined(DBUG_OFF)
if (tmp->dbug)
{
free(tmp->dbug);
tmp->dbug=0;
}
#endif
#if !defined(__bsdi__) || defined(HAVE_mit_thread) /* bsdi dumps core here */
pthread_cond_destroy(&tmp->suspend);
#endif
pthread_mutex_destroy(&tmp->mutex);
#if !defined(__WIN__) || defined(USE_TLS)
free(tmp);
#endif
}
#if !defined(__WIN__) || defined(USE_TLS)
pthread_setspecific(THR_KEY_mysys,0);
#endif
}
struct st_my_thread_var *_my_thread_var(void)
{
struct st_my_thread_var *tmp=
my_pthread_getspecific(struct st_my_thread_var*,THR_KEY_mysys);
#if defined(USE_TLS)
/* This can only happen in a .DLL */
if (!tmp)
{
my_thread_init();
tmp=my_pthread_getspecific(struct st_my_thread_var*,THR_KEY_mysys);
}
#endif
return tmp;
}
/****************************************************************************
** Get name of current thread.
****************************************************************************/
#define UNKNOWN_THREAD -1
long my_thread_id()
{
#if defined(HAVE_PTHREAD_GETSEQUENCE_NP)
return pthread_getsequence_np(pthread_self());
#elif (defined(__sun) || defined(__sgi) || defined(__linux__)) && !defined(HAVE_mit_thread)
return pthread_self();
#else
return my_thread_var->id;
#endif
}
#ifdef DBUG_OFF
char *my_thread_name(void)
{
return "no_name";
}
#else
char *my_thread_name(void)
{
char name_buff[100];
struct st_my_thread_var *tmp=my_thread_var;
if (!tmp->name[0])
{
long id=my_thread_id();
sprintf(name_buff,"T@%ld", id);
strmake(tmp->name,name_buff,THREAD_NAME_SIZE);
}
return tmp->name;
}
#endif /* DBUG_OFF */
#endif /* THREAD */
|
