P1 --> 1
P2 --> 1
P3 --> 1
P4 --> 1
Even 4 processes can be in safe with 5 resources. So upto 5 processes there will be no deadlock.
Consider the following transaction involving two bank accounts x and y.
Read (x); x: = x - 50; write(x); read(y); y: = y + 50; write(y)
The constraint that the sum of the accounts x and y should remain constant is that of
bind, listen, accept and recv are server side socket API functions. bind() associates a socket with a socket address structure, i.e. a specified local port number and IP address. listen() causes a bound TCP socket to enter listening state. accept() accepts a received incoming attempt to create a new TCP connection from the remote client, recv() is used to receive data from a remote socket. A server must first do bind() to tell operating system the port number on which it would be listing, then it must listen to receive incoming connection requests on the bound port number. Once a connection comes, the server accepts using accept(), then starts receiving data using recv().
Cookies are not piece of code, they are just strings typically in the form of key value pairs.
Cookies are data, stored in small text files, on your computer.
When a web server has sent a web page to a browser, the connection is shut down, and the server forgets everything about the user.
Cookies were invented to solve the problem "how to remember information about the user':
When a user visits a web page, his name can be stored in a cookie.
Next time the user visits the page, the cookie "remembers" his name.
Consider the following routing table at an IP router:
For each IP address in Group I identifythe correct choice of the next hop from Group II using the entries from the routing table above.
Group I i) 128.96.171.92 ii) 128.96.167.151 iii) 128.96.163.151 iv) 128.96.165.121 Group II a) Interface 0 b) Interface 1 c) R2 d) R3 e) R4
UDP data = 8880 bytes UDP header = 8 bytes IP Header = 20 bytes Total Size excluding IP Header = 8888 bytes. Number of fragments = ⌈ 8888 / 1480 ⌉ = 7 Refer the Kurose book slides on IP (Offset is always scaled by 8) Offset of last segment = (1480 * 6) / 8 = 1110
Consider a simple checkpointing protocol and the following set of operations in the log.
(start, T4); (write, T4, y, 2, 3); (start, T1); (commit, T4); (write, T1, z, 5, 7); (checkpoint); (start, T2); (write, T2, x, 1, 9); (commit, T2); (start, T3), (write, T3, z, 7, 2); If a crash happens now and the system tries to recover using both undo and redo operations, what are the contents of the undo list and the redo list?
Since T1 and T3 are not committed yet, they must be undone. The transaction T2 must be redone because it is after the latest checkpoint. A transaction symbolizes a unit of work performed within a database management system (or similar system) against a database, and treated in a coherent and reliable way independent of other transactions. A transaction generally represents any change in database. Transactions in a database environment have two main purposes: To provide reliable units of work that allow correct recovery from failures and keep a database consistent even in cases of system failure, when execution stops (completely or partially) and many operations upon a database remain uncompleted, with unclear status. To provide isolation between programs accessing a database concurrently. If this isolation is not provided, the programs' outcomes are possibly erroneous.
Full outer join of above two is So the full outer join contains e = (1, 5, 7), f = (3, 7, null), g = (4, null, 9).
Best fit allocates the smallest block among those that are large enough for the new process. So the memory blocks are allocated in below order. 357 ---> 400 210 ---> 250 468 ---> 500 491 ---> 600
Consider the intermediate code given below.
(1) i = 1 (2) j = 1 (3) t1 = 5 ∗ i (4) t2 = t1 + j (5) t3 = 4 ∗ t2 (6) t4 = t3 (7) a[t4] = -1 (8) j = j + 1 (9) if j<=5 goto (3) (10) i=i+1 (11) if i<5 goto (2) The number of nodes and edges in the control-flow-graph constructed for the above code, respectively, are
The above is the control flow graph.