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Vsevolod [243]
2 years ago
11

In Section 8.5.4, we described a situation in which we prevent deadlock by ensuring that all locks are acquired in a certain ord

er. However, we also point out that deadlock is possible in this situation if two threads simultaneously invoke the transaction () function. Fix the transaction () function to prevent deadlocks.
Computers and Technology
1 answer:
ruslelena [56]2 years ago
4 0

Answer:

See Explaination

Explanation:

Separating this critical section into two sections:

void transaction(Account from, Account to, double amount)

{

Semaphore lock1, lock2;

lock1 = getLock(from);

lock2 = getLock(to);

wait(lock1);

withdraw(from, amount);

signal(lock1);

wait(lock2);

deposit(to, amount);

signal(lock2);

}

will be the best solution in the real world, because separating this critical section doesn't lead to any unwanted state between them (that is, there will never be a situation, where there is more money withdrawn, than it is possible).

The simple solution to leave the critical section in one piece, is to ensure that lock order is the same in all transactions. In this case you can sort the locks and choose the smaller one for locking first.

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Marta_Voda [28]
== is an operator that returns a boolean if both operand are equal.

1101 * 10 is 11010

11000 + 10 is 11010


11010 == 11010

Thus the output would be True.
5 0
2 years ago
What are the two main functions of user accounts in Active Directory? (Choose all that apply.) Allow users to access resources m
irina [24]

Answer:

method for user authentication to the network

Provide detailed information about a user

Explanation:

An in AD, a user account consists of all the information that includes user names, passwords, and groups. All these information defines a domain user in which a user account has membership access to. With the advanced features of Kerbos, mutual authentication in user accounts to a service is achieved.

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2 years ago
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CodeLab Question
castortr0y [4]

Answer:

Idk the language of code but here is how it would be done in python

myAlarm():

   arm = True

   code = "secret message"

myAlarm()

main():

deactivate = input(">>> ")

if deactivate = myAlarm.code:

  arm = False

Im still a little confused on the question.

(I am a game designer and I code daily)

3 0
2 years ago
Explain why each of the following names does or does not seem like a good variable name to represent a state sales tax rate.
tatyana61 [14]

a. stateTaxRate  - A good variable name because it represents what it holds, the state sales tax rate, without being too wordy. Also correctly capitalized in camelcase.

b. txRt  - A bad variable name because while short and simple, it is too hard to understand what the variable represents.

c. t  - A very bad variable name if you plan on using the variable often. Far too short and you will forget what it represents and is needed for.

d. stateSalesTaxRateValue  - A bad variable name because it is just too wordy. Cutting it down to A's variable name is much more reasonable

e. state tax rate  - A bad variable name and probably invalid because it has spaces in the name.

f. taxRate  - A good variable name if there are no other tax calculations other than state tax rate. Otherwise you would confuse state vs local tax rate or something, making it a bad variable name.

g. 1TaxRate  - A bad variable name because the number 1 has no reason being in the variable name. It doesn't add anything to the name.

h. moneyCharged - A bad variable name because it is not specific enough in explaining why the money is being charged and what for.

7 0
2 years ago
You work for a shipping company and your manager receives orders from various customers everyday some existing ,some new .your m
Gennadij [26K]

Answer:

It's good to consider this as a dictionary, with key-value pair, or as a two-dimensional array.

And in the first case, the code will be as below:

day_i={'Bob':'100', 'Alice':'100','Celia':'110','Bob':'200'}

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Explanation:

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6 0
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