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When a user is created in Linux using the useradd command, the <em>immediate state</em> of the created account is locked.
- The useradd command can be invoked in other to create a new user account using the following command
sudo useradd fast_user
<em>#fast_user</em><em> </em><em>is</em><em> </em><em>the</em><em> </em><em>name</em><em> </em><em>of</em><em> </em><em>the</em><em> </em><em>account</em><em> </em><em>created</em><em> </em>
- At this point, the account has been created but it will be locked until the required login details are set. This can be achieved using the line ;
sudo passwd fast_user
Therefore, an account created using the useradd command is in a locked state.
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Answer:
Explanation:
Following are the Semaphores:
Customers: Counts waiting customers;
Barbers: Number of idle barbers (0 or 1)
mutex: Used for mutual exclusion.
Cutting: Ensures that the barber won’t cut another customer’s hair before the previous customer leaves
Shared data variable:
count_cust: Counts waiting customers. ------------copy of customers. As value of semaphores can’t access directly.
// shared data
semaphore customers = 0; semaphore barbers = 0; semaphore cutting = 0; semaphore mutex = 1;
int count_cust= 0;
void barber() {
while(true) { //shop is always open
wait(customers); //sleep when there are no waiting customers
wait(mutex); //mutex for accessing customers1
count_cust= count_cust-1; //customer left
signal(barbers);
signal(mutex);
cut_hair();
}
}
void customer() {
wait(mutex); //mutex for accessing count_cust
if (count_cust< n) {
count_cust= count_cust+1; //new customer
signal(customers); signal(mutex);
wait(barbers); //wait for available barbers get_haircut();
}
else { //do nothing (leave) when all chairs are used. signal(mutex);
}
}
cut_hair(){ waiting(cutting);
}
get_haircut(){
get hair cut for some time; signal(cutting);
}
Answer:
Push notification services.
Explanation:
Push notification services can be used to deliver important messages on mobile devices in an efficient and timely manner. The different mobile platforms such as android, iOS have their services which makes it easy for Jabez to send the messages to users with a specific brand and type of mobile device. The messages will pop up on the mobile device of the user, whether the app or the website associated with notifications is running or not.
Answer:
. According to the Department of Commerce, 34.0% percent of single moms in the US qualified as poor.
Explanation:
