SQLite

Check-in [7562f1fbed]
Login

Many hyperlinks are disabled.
Use anonymous login to enable hyperlinks.

Overview
Comment:Add more asserts to the mutex subsystem.
Downloads: Tarball | ZIP archive
Timelines: family | ancestors | descendants | both | mutexInitCmpSwap
Files: files | file ages | folders
SHA1: 7562f1fbede70b19bbbb928e0a534203528b5b65
User & Date: mistachkin 2015-09-12 03:35:55.815
Context
2015-09-12
03:40
Clarify the new mutex implementation reset logic in sqlite3_shutdown(). (check-in: f9a034834e user: mistachkin tags: mutexInitCmpSwap)
03:35
Add more asserts to the mutex subsystem. (check-in: 7562f1fbed user: mistachkin tags: mutexInitCmpSwap)
01:17
Fix typo in the Win32 implementation of sqlite3CompareAndSwap. (check-in: 31a26a1dd7 user: mistachkin tags: mutexInitCmpSwap)
Changes
Side-by-Side Diff Ignore Whitespace Patch
Changes to src/mutex.c.
︙
63
64
65
66
67
68
69

70
71
72
73
74
75
76

63
64
65
66
67
68
69
70
71
72
73
74
75
76
77








+








      pFrom = sqlite3DefaultMutex();
    }else{
      pFrom = sqlite3NoopMutex();
    }
    mutexCopy(&sqlite3GlobalConfig.mutex, pFrom);
    sqlite3MemoryBarrier();
  }
  assert( sqlite3GlobalConfig.mutex.xMutexInit );
  rc = sqlite3GlobalConfig.mutex.xMutexInit();

#ifdef SQLITE_DEBUG
  GLOBAL(int, mutexIsInit) = 1;
#endif

  return rc;
︙
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

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








+








+








+










+











+













+










+



+






** Retrieve a pointer to a static mutex or allocate a new dynamic one.
*/
sqlite3_mutex *sqlite3_mutex_alloc(int id){
#ifndef SQLITE_OMIT_AUTOINIT
  if( id<=SQLITE_MUTEX_RECURSIVE && sqlite3_initialize() ) return 0;
  if( id>SQLITE_MUTEX_RECURSIVE && sqlite3MutexInit() ) return 0;
#endif
  assert( sqlite3GlobalConfig.mutex.xMutexAlloc );
  return sqlite3GlobalConfig.mutex.xMutexAlloc(id);
}

sqlite3_mutex *sqlite3MutexAlloc(int id){
  if( !sqlite3GlobalConfig.bCoreMutex ){
    return 0;
  }
  assert( GLOBAL(int, mutexIsInit) );
  assert( sqlite3GlobalConfig.mutex.xMutexAlloc );
  return sqlite3GlobalConfig.mutex.xMutexAlloc(id);
}

/*
** Free a dynamic mutex.
*/
void sqlite3_mutex_free(sqlite3_mutex *p){
  if( p ){
    assert( sqlite3GlobalConfig.mutex.xMutexFree );
    sqlite3GlobalConfig.mutex.xMutexFree(p);
  }
}

/*
** Obtain the mutex p. If some other thread already has the mutex, block
** until it can be obtained.
*/
void sqlite3_mutex_enter(sqlite3_mutex *p){
  if( p ){
    assert( sqlite3GlobalConfig.mutex.xMutexEnter );
    sqlite3GlobalConfig.mutex.xMutexEnter(p);
  }
}

/*
** Obtain the mutex p. If successful, return SQLITE_OK. Otherwise, if another
** thread holds the mutex and it cannot be obtained, return SQLITE_BUSY.
*/
int sqlite3_mutex_try(sqlite3_mutex *p){
  int rc = SQLITE_OK;
  if( p ){
    assert( sqlite3GlobalConfig.mutex.xMutexTry );
    return sqlite3GlobalConfig.mutex.xMutexTry(p);
  }
  return rc;
}

/*
** The sqlite3_mutex_leave() routine exits a mutex that was previously
** entered by the same thread.  The behavior is undefined if the mutex 
** is not currently entered. If a NULL pointer is passed as an argument
** this function is a no-op.
*/
void sqlite3_mutex_leave(sqlite3_mutex *p){
  if( p ){
    assert( sqlite3GlobalConfig.mutex.xMutexLeave );
    sqlite3GlobalConfig.mutex.xMutexLeave(p);
  }
}

#ifndef NDEBUG
/*
** The sqlite3_mutex_held() and sqlite3_mutex_notheld() routine are
** intended for use inside assert() statements.
*/
int sqlite3_mutex_held(sqlite3_mutex *p){
  assert( p==0 || sqlite3GlobalConfig.mutex.xMutexHeld );
  return p==0 || sqlite3GlobalConfig.mutex.xMutexHeld(p);
}
int sqlite3_mutex_notheld(sqlite3_mutex *p){
  assert( p==0 || sqlite3GlobalConfig.mutex.xMutexNotheld );
  return p==0 || sqlite3GlobalConfig.mutex.xMutexNotheld(p);
}
#endif

#endif /* !defined(SQLITE_MUTEX_OMIT) */