escribe what changes would be necessary so that a process waiting to acquire a mutex lock would be blocked and placed into a waiting queue until the lock became available.
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Question P
The implementation of mutex locks provided in Section 5.5 suffers from busy waiting. Describe what changes would be necessary so that a process waiting to acquire a mutex lock would be blocked and placed into a waiting queue until the lock became available.
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- When constructing a mutex, what are the advantages of employing a busy wait technique over blocking? Answer options in a group It enables the use of a separate API call. It prevents lock contention and operations like storing process registers to memory. Is it possible to control the lock granularity?Home Alarm System company provides the security alarm and central monitoring system specializing for home usage. Every month, they will obtain the log file which record the series of input from all installed sensors. Given the faulty signal is 0001 and sample of logfile is 010100010100100010001101000, (a) Construct DFA diagram which will match the faulty signal and series in the log file.Which of the following statements is true for dealing with the deadlock problem: i. We can use the protocol to prevent, ensuring that the system will never enter a deadlocked i. state. ii. ii. We can allow the system to enter a deadlocked state, detect it, and recover. iii. iii. We can ignore the problem altogether and pretend that deadlocks never occur in the system iv. iv. We can use the protocol to avoid, ensuring that the system will never enter an unsafe and deadlock state. O a. i, ii O b.j O c. i,ii,iii O d. i,ii,iii,&iv
- If you have the following primitive flow table, after the merging step the merging flow table comprises ........... states only. Next State (X1 X2) Outputs Present State 00 01 11 10 Z1 Z2 a @ 6 C O O - 6 a 6 d O O C a e O O - d @ O 1 e 6 1 O 4 5 2 O OLL Ⓒ C CHome Alarm System company provides the security alarm and central monitoring system specializing for home usage. Every month, they will obtain the log file which record the series of input from all installed sensors. Given the faulty signal is 0001 and sample of logfile is 010100010100100010001101000, (a) Construct DFA diagram which will match the faulty signal and series in the log file. (a) o answer c fast plz (c) Convert DFA in (a) into a regular expression.One of the problems with the Internet email system is that sending forged emails is relatively straightforward, i.e., it is easy to send an email with a fake sender/from address. One solution to this problem would be for a domain’s mail servers to digitally sign any email originating from the domain. For this to be useful, the public key would need to be made available to clients to validate the signatures. It is proposed that the public keys of the mail servers will be verified and signed by a certification authority (same as SSL/TLS certificates) and distributed via a standardised URL for the domain, e.g., https://mybusiness.com/email.pubkey. (a) Explain how the client would obtain the public key and validate the email server’s digital signatures. (b) Discuss the problem of trusting the obtained public key and how this solution results in public keys that can/cannot be trusted. (c) Indicate whether you believe this approach could be used to prevent forged emails and explain why it…
- Consider the process track request are 98, 183, 37, 122, 14, 124, 14, 124, 65, 67 and the initial seek is 53. What is the total number of seeks for the C-Look algorithm?When does HOL blocking occur? Where does it happen, the input or the output?Give an example where the read one, write all available approach leads to anerroneous state.
- Suppose we are using a method of encryption that does as much as possible to hide any patterns of a file, including symbol frequencies. And suppose we also want to compress the same file. In terms of the compression performance (the size of compressed file), is it better to compress the file before encrypting it, or encrypt the file before compressing it? Briefly explain the reasonSuppose we're modelling an RC crane which is receiving a sequence of input commands, each of which is UP, DOWN, or BEEP. This crane has only two vertical positions, and starts in the high position. It should go into an ERROR end state if it is asked to go UP when it is in the high position or DOWN when it is in the low position. Once it is in the ERROR state, it stays in the ERROR state no matter what commands it receives. BEEP commands are legal at any point. Give a state diagram for this system, in which each edge corresponds to receiving a single command.What are the security implications associated with the "Object Graph" during serialization?