68478 static const char *walLockName(int lockIdx){  argument
68479   if( lockIdx==WAL_WRITE_LOCK ){
68481   }else if( lockIdx==WAL_CKPT_LOCK ){
68483   }else if( lockIdx==WAL_RECOVER_LOCK ){
68488                      lockIdx-WAL_READ_LOCK(0));
68502 static int walLockShared(Wal *pWal, int lockIdx){  argument
68505   rc = sqlite3OsShmLock(pWal->pDbFd, lockIdx, 1,
68508             walLockName(lockIdx), rc ? "failed" : "ok"));
68511   if( rc==SQLITE_OK ) pWal->lockMask |= (1 << lockIdx);
68515 static void walUnlockShared(Wal *pWal, int lockIdx){  argument
68517   (void)sqlite3OsShmLock(pWal->pDbFd, lockIdx, 1,
68520   pWal->lockMask &= ~(1 << lockIdx);
68522   WALTRACE(("WAL%p: release SHARED-%s\n", pWal, walLockName(lockIdx)));
68524 static int walLockExclusive(Wal *pWal, int lockIdx, int n){  argument
68527   rc = sqlite3OsShmLock(pWal->pDbFd, lockIdx, n,
68530             walLockName(lockIdx), n, rc ? "failed" : "ok"));
68534     pWal->lockMask |= (((1<<n)-1) << (SQLITE_SHM_NLOCK+lockIdx));
68539 static void walUnlockExclusive(Wal *pWal, int lockIdx, int n){  argument
68541   (void)sqlite3OsShmLock(pWal->pDbFd, lockIdx, n,
68544   pWal->lockMask &= ~(((1<<n)-1) << (SQLITE_SHM_NLOCK+lockIdx));
68547              walLockName(lockIdx), n));
69528   int lockIdx,                    /* Offset of first byte to lock */  argument
69533     rc = walLockExclusive(pWal, lockIdx, n);