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
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
|
/* 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., 51 Franklin Street, Fifth Floor, Boston,
MA 02111-1301, USA */
/* This makes a wrapper for mutex handling to make it easier to debug mutex */
#include <my_global.h>
#if defined(HAVE_LINUXTHREADS) && !defined (__USE_UNIX98)
#define __USE_UNIX98 /* To get rw locks under Linux */
#endif
#include <m_string.h>
#if defined(THREAD) && defined(SAFE_MUTEX)
#undef SAFE_MUTEX /* Avoid safe_mutex redefinitions */
#include <my_pthread.h>
#ifndef DO_NOT_REMOVE_THREAD_WRAPPERS
/* Remove wrappers */
#undef pthread_mutex_init
#undef pthread_mutex_lock
#undef pthread_mutex_unlock
#undef pthread_mutex_destroy
#undef pthread_cond_wait
#undef pthread_cond_timedwait
#ifdef HAVE_NONPOSIX_PTHREAD_MUTEX_INIT
#define pthread_mutex_init(a,b) my_pthread_mutex_init((a),(b))
#endif
#endif /* DO_NOT_REMOVE_THREAD_WRAPPERS */
int safe_mutex_init(safe_mutex_t *mp,
const pthread_mutexattr_t *attr __attribute__((unused)))
{
bzero((char*) mp,sizeof(*mp));
pthread_mutex_init(&mp->global,MY_MUTEX_INIT_ERRCHK);
pthread_mutex_init(&mp->mutex,attr);
return 0;
}
int safe_mutex_lock(safe_mutex_t *mp,const char *file, uint line)
{
int error;
pthread_mutex_lock(&mp->global);
if (mp->count > 0 && pthread_equal(pthread_self(),mp->thread))
{
fprintf(stderr,"safe_mutex: Trying to lock mutex at %s, line %d, when the mutex was already locked at %s, line %d\n",
file,line,mp->file,mp->line);
fflush(stderr);
abort();
}
pthread_mutex_unlock(&mp->global);
error=pthread_mutex_lock(&mp->mutex);
if (error || (error=pthread_mutex_lock(&mp->global)))
{
fprintf(stderr,"Got error %d when trying to lock mutex at %s, line %d\n",
error, file, line);
fflush(stderr);
abort();
}
if (mp->count++)
{
fprintf(stderr,"safe_mutex: Error in thread libray: Got mutex at %s, line %d more than 1 time\n", file,line);
fflush(stderr);
abort();
}
mp->thread=pthread_self();
mp->file= (char*) file;
mp->line=line;
pthread_mutex_unlock(&mp->global);
return error;
}
int safe_mutex_unlock(safe_mutex_t *mp,const char *file, uint line)
{
int error;
pthread_mutex_lock(&mp->global);
if (mp->count == 0)
{
fprintf(stderr,"safe_mutex: Trying to unlock mutex that wasn't locked at %s, line %d\n Last used at %s, line: %d\n",
file,line,mp->file ? mp->file : "",mp->line);
fflush(stderr);
abort();
}
if (!pthread_equal(pthread_self(),mp->thread))
{
fprintf(stderr,"safe_mutex: Trying to unlock mutex at %s, line %d that was locked by another thread at: %s, line: %d\n",
file,line,mp->file,mp->line);
fflush(stderr);
abort();
}
mp->count--;
#ifdef _WIN32
pthread_mutex_unlock(&mp->mutex);
error=0;
#else
error=pthread_mutex_unlock(&mp->mutex);
if (error)
{
fprintf(stderr,"safe_mutex: Got error: %d when trying to unlock mutex at %s, line %d\n", error, file, line);
fflush(stderr);
abort();
}
#endif /* _WIN32 */
pthread_mutex_unlock(&mp->global);
return error;
}
int safe_cond_wait(pthread_cond_t *cond, safe_mutex_t *mp, const char *file,
uint line)
{
int error;
pthread_mutex_lock(&mp->global);
if (mp->count == 0)
{
fprintf(stderr,"safe_mutex: Trying to cond_wait on a unlocked mutex at %s, line %d\n",file,line);
fflush(stderr);
abort();
}
if (!pthread_equal(pthread_self(),mp->thread))
{
fprintf(stderr,"safe_mutex: Trying to cond_wait on a mutex at %s, line %d that was locked by another thread at: %s, line: %d\n",
file,line,mp->file,mp->line);
fflush(stderr);
abort();
}
if (mp->count-- != 1)
{
fprintf(stderr,"safe_mutex: Count was %d on locked mutex at %s, line %d\n",
mp->count+1, file, line);
fflush(stderr);
abort();
}
pthread_mutex_unlock(&mp->global);
error=pthread_cond_wait(cond,&mp->mutex);
pthread_mutex_lock(&mp->global);
if (error)
{
fprintf(stderr,"safe_mutex: Got error: %d when doing a safe_mutex_wait at %s, line %d\n", error, file, line);
fflush(stderr);
abort();
}
if (mp->count++)
{
fprintf(stderr,
"safe_mutex: Count was %d in thread %lx when locking mutex at %s, line %d\n",
mp->count-1, my_thread_id(), file, line);
fflush(stderr);
abort();
}
mp->thread=pthread_self();
mp->file= (char*) file;
mp->line=line;
pthread_mutex_unlock(&mp->global);
return error;
}
int safe_cond_timedwait(pthread_cond_t *cond, safe_mutex_t *mp,
struct timespec *abstime,
const char *file, uint line)
{
int error;
pthread_mutex_lock(&mp->global);
if (mp->count != 1 || !pthread_equal(pthread_self(),mp->thread))
{
fprintf(stderr,"safe_mutex: Trying to cond_wait at %s, line %d on a not hold mutex\n",file,line);
fflush(stderr);
abort();
}
mp->count--; /* Mutex will be released */
pthread_mutex_unlock(&mp->global);
error=pthread_cond_timedwait(cond,&mp->mutex,abstime);
#ifdef EXTRA_DEBUG
if (error && (error != EINTR && error != ETIMEDOUT))
{
fprintf(stderr,"safe_mutex: Got error: %d when doing a safe_mutex_timedwait at %s, line %d\n", error, file, line);
}
#endif
pthread_mutex_lock(&mp->global);
if (mp->count++)
{
fprintf(stderr,
"safe_mutex: Count was %d in thread %lx when locking mutex at %s, line %d (error: %d)\n",
mp->count-1, my_thread_id(), file, line, error);
fflush(stderr);
abort();
}
mp->thread=pthread_self();
mp->file= (char*) file;
mp->line=line;
pthread_mutex_unlock(&mp->global);
return error;
}
int safe_mutex_destroy(safe_mutex_t *mp, const char *file, uint line)
{
int error=0;
if (mp->count != 0)
{
fprintf(stderr,"safe_mutex: Trying to destroy a mutex that was locked at %s, line %d at %s, line %d\n",
mp->file,mp->line, file, line);
fflush(stderr);
abort();
}
#ifdef _WIN32
pthread_mutex_destroy(&mp->global);
pthread_mutex_destroy(&mp->mutex);
#else
if (pthread_mutex_destroy(&mp->global))
error=1;
if (pthread_mutex_destroy(&mp->mutex))
error=1;
#endif
return error;
}
#endif /* THREAD && SAFE_MUTEX */
|
