27 static void lockBtreeMutex(Btree *p){  in lockBtreeMutex()  argument
28   assert( p->locked==0 );  in lockBtreeMutex()
29   assert( sqlite3_mutex_notheld(p->pBt->mutex) );  in lockBtreeMutex()
30   assert( sqlite3_mutex_held(p->db->mutex) );  in lockBtreeMutex()
32   sqlite3_mutex_enter(p->pBt->mutex);  in lockBtreeMutex()
33   p->pBt->db = p->db;  in lockBtreeMutex()
34   p->locked = 1;  in lockBtreeMutex()
41 static void SQLITE_NOINLINE unlockBtreeMutex(Btree *p){  in unlockBtreeMutex()  argument
42   BtShared *pBt = p->pBt;  in unlockBtreeMutex()
43   assert( p->locked==1 );  in unlockBtreeMutex()
45   assert( sqlite3_mutex_held(p->db->mutex) );  in unlockBtreeMutex()
46   assert( p->db==pBt->db );  in unlockBtreeMutex()
49   p->locked = 0;  in unlockBtreeMutex()
53 static void SQLITE_NOINLINE btreeLockCarefully(Btree *p);
71 void sqlite3BtreeEnter(Btree *p){  in sqlite3BtreeEnter()  argument
76   assert( p->pNext==0 || p->pNext->pBt>p->pBt );  in sqlite3BtreeEnter()
77   assert( p->pPrev==0 || p->pPrev->pBt<p->pBt );  in sqlite3BtreeEnter()
78   assert( p->pNext==0 || p->pNext->db==p->db );  in sqlite3BtreeEnter()
79   assert( p->pPrev==0 || p->pPrev->db==p->db );  in sqlite3BtreeEnter()
80   assert( p->sharable || (p->pNext==0 && p->pPrev==0) );  in sqlite3BtreeEnter()
83   assert( !p->locked || p->wantToLock>0 );  in sqlite3BtreeEnter()
84   assert( p->sharable || p->wantToLock==0 );  in sqlite3BtreeEnter()
87   assert( sqlite3_mutex_held(p->db->mutex) );  in sqlite3BtreeEnter()
91   assert( (p->locked==0 && p->sharable) || p->pBt->db==p->db );  in sqlite3BtreeEnter()
93   if( !p->sharable ) return;  in sqlite3BtreeEnter()
94   p->wantToLock++;  in sqlite3BtreeEnter()
95   if( p->locked ) return;  in sqlite3BtreeEnter()
96   btreeLockCarefully(p);  in sqlite3BtreeEnter()
105 static void SQLITE_NOINLINE btreeLockCarefully(Btree *p){  in btreeLockCarefully()  argument
112   if( sqlite3_mutex_try(p->pBt->mutex)==SQLITE_OK ){  in btreeLockCarefully()
113     p->pBt->db = p->db;  in btreeLockCarefully()
114     p->locked = 1;  in btreeLockCarefully()
123   for(pLater=p->pNext; pLater; pLater=pLater->pNext){  in btreeLockCarefully()
131   lockBtreeMutex(p);  in btreeLockCarefully()
132   for(pLater=p->pNext; pLater; pLater=pLater->pNext){  in btreeLockCarefully()
143 void sqlite3BtreeLeave(Btree *p){  in sqlite3BtreeLeave()  argument
144   assert( sqlite3_mutex_held(p->db->mutex) );  in sqlite3BtreeLeave()
145   if( p->sharable ){  in sqlite3BtreeLeave()
146     assert( p->wantToLock>0 );  in sqlite3BtreeLeave()
147     p->wantToLock--;  in sqlite3BtreeLeave()
148     if( p->wantToLock==0 ){  in sqlite3BtreeLeave()
149       unlockBtreeMutex(p);  in sqlite3BtreeLeave()
161 int sqlite3BtreeHoldsMutex(Btree *p){  in sqlite3BtreeHoldsMutex()  argument
162   assert( p->sharable==0 || p->locked==0 || p->wantToLock>0 );  in sqlite3BtreeHoldsMutex()
163   assert( p->sharable==0 || p->locked==0 || p->db==p->pBt->db );  in sqlite3BtreeHoldsMutex()
164   assert( p->sharable==0 || p->locked==0 || sqlite3_mutex_held(p->pBt->mutex) );  in sqlite3BtreeHoldsMutex()
165   assert( p->sharable==0 || p->locked==0 || sqlite3_mutex_held(p->db->mutex) );  in sqlite3BtreeHoldsMutex()
167   return (p->sharable==0 || p->locked);  in sqlite3BtreeHoldsMutex()
189   Btree *p;  in btreeEnterAll()  local
192     p = db->aDb[i].pBt;  in btreeEnterAll()
193     if( p && p->sharable ){  in btreeEnterAll()
194       sqlite3BtreeEnter(p);  in btreeEnterAll()
205   Btree *p;  in btreeLeaveAll()  local
208     p = db->aDb[i].pBt;  in btreeLeaveAll()
209     if( p ) sqlite3BtreeLeave(p);  in btreeLeaveAll()
229     Btree *p;  in sqlite3BtreeHoldsAllMutexes()  local
230     p = db->aDb[i].pBt;  in sqlite3BtreeHoldsAllMutexes()
231     if( p && p->sharable &&  in sqlite3BtreeHoldsAllMutexes()
232          (p->wantToLock==0 || !sqlite3_mutex_held(p->pBt->mutex)) ){  in sqlite3BtreeHoldsAllMutexes()
253   Btree *p;  in sqlite3SchemaMutexHeld()  local
260   p = db->aDb[iDb].pBt;  in sqlite3SchemaMutexHeld()
261   assert( p!=0 );  in sqlite3SchemaMutexHeld()
262   return p->sharable==0 || p->locked==1;  in sqlite3SchemaMutexHeld()
277 void sqlite3BtreeEnter(Btree *p){  in sqlite3BtreeEnter()  argument
278   p->pBt->db = p->db;  in sqlite3BtreeEnter()
283     Btree *p = db->aDb[i].pBt;  in sqlite3BtreeEnterAll()  local
284     if( p ){  in sqlite3BtreeEnterAll()
285       p->pBt->db = p->db;  in sqlite3BtreeEnterAll()