本文整理汇总了C#中Btree类的典型用法代码示例。如果您正苦于以下问题：C#Btree类的具体用法？C#Btree怎么用？C#Btree使用的例子？这里精选的类代码示例或许可以为您提供帮助。 示例1:sqlite3BtreeEnter /* **EnteramutexonthegivenBTreeobject. ** **Iftheobjectisnotsharable,thennomutexiseverrequired **andthisroutineisano-op.Theunderlyingmutexisnon-recursive. **ButwekeepareferencecountinBtree.wantToLocksothebehavior **ofthisinterfaceisrecursive. ** **Toavoiddeadlocks,multipleBtreesarelockedinthesameorder **byalldatabaseconnections.Thep->pNextisalistofother **BtreesbelongingtothesamedatabaseconnectionasthepBtree **whichneedtobelockedafterp.Ifwecannotgetalockon **p,thenfirstunlockalloftheothersonp->pNext,thenwait **forthelocktobecomeavailableonp,thenrelockallofthe **subsequentBtreesthatdesirealock. */ voidsqlite3BtreeEnter(Btree*p) { Btree*pLater; /*SomebasicsanitycheckingontheBtree.ThelistofBtrees **connectedbypNextandpPrevshouldbeinsortedorderby **Btree.pBtvalue.Allelementsofthelistshouldbelongto **thesameconnection.OnlysharedBtreesareonthelist.*/ assert(p->pNext==0||p->pNext->pBt>p->pBt); assert(p->pPrev==0||p->pPrev->pBtpBt); assert(p->pNext==0||p->pNext->db==p->db); assert(p->pPrev==0||p->pPrev->db==p->db); assert(p->sharable||(p->pNext==0&&p->pPrev==0)); /*Checkforlockingconsistency*/ assert(!p->locked||p->wantToLock>0); assert(p->sharable||p->wantToLock==0); /*Weshouldalreadyholdalockonthedatabaseconnection*/ assert(sqlite3_mutex_held(p->db->mutex)); /*Unlessthedatabaseissharableandunlocked,thenBtShared.db **shouldalreadybesetcorrectly.*/ assert((p->locked==0&&p->sharable)||p->pBt->db==p->db); if(!p->sharable)return; p->wantToLock++; if(p->locked)return; /*Inmostcases,weshouldbeabletoacquirethelockwe **wantwithouthavingtogothroughttheascendinglock **procedurethatfollows.Justbesurenottoblock. */ if(sqlite3_mutex_try(p->pBt->mutex)==SQLITE_OK){ p->pBt->db=p->db; p->locked=1; return; } /*Toavoiddeadlock,firstreleasealllockswithalarger **BtSharedaddress.Thenacquireourlock.Thenreacquire **theotherBtSharedlocksthatweusedtoholdinascending **order. */ for(pLater=p->pNext;pLater;pLater=pLater->pNext){ assert(pLater->sharable); assert(pLater->pNext==0||pLater->pNext->pBt>pLater->pBt); assert(!pLater->locked||pLater->wantToLock>0); if(pLater->locked){ unlockBtreeMutex(pLater); } } lockBtreeMutex(p); for(pLater=p->pNext;pLater;pLater=pLater->pNext){ if(pLater->wantToLock){ lockBtreeMutex(pLater); } } }
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