908 static const char *walLockName(int lockIdx){  in walLockName()  argument
909   if( lockIdx==WAL_WRITE_LOCK ){  in walLockName()
911   }else if( lockIdx==WAL_CKPT_LOCK ){  in walLockName()
913   }else if( lockIdx==WAL_RECOVER_LOCK ){  in walLockName()
918                      lockIdx-WAL_READ_LOCK(0));  in walLockName()
932 static int walLockShared(Wal *pWal, int lockIdx){  in walLockShared()  argument
935   rc = sqlite3OsShmLock(pWal->pDbFd, lockIdx, 1,  in walLockShared()
938             walLockName(lockIdx), rc ? "failed" : "ok"));  in walLockShared()
942 static void walUnlockShared(Wal *pWal, int lockIdx){  in walUnlockShared()  argument
944   (void)sqlite3OsShmLock(pWal->pDbFd, lockIdx, 1,  in walUnlockShared()
946   WALTRACE(("WAL%p: release SHARED-%s\n", pWal, walLockName(lockIdx)));  in walUnlockShared()
948 static int walLockExclusive(Wal *pWal, int lockIdx, int n){  in walLockExclusive()  argument
951   rc = sqlite3OsShmLock(pWal->pDbFd, lockIdx, n,  in walLockExclusive()
954             walLockName(lockIdx), n, rc ? "failed" : "ok"));  in walLockExclusive()
958 static void walUnlockExclusive(Wal *pWal, int lockIdx, int n){  in walUnlockExclusive()  argument
960   (void)sqlite3OsShmLock(pWal->pDbFd, lockIdx, n,  in walUnlockExclusive()
963              walLockName(lockIdx), n));  in walUnlockExclusive()
1947   int lockIdx,                    /* Offset of first byte to lock */  in walBusyLock()  argument
1952     rc = walLockExclusive(pWal, lockIdx, n);  in walBusyLock()