The following snippet of pseudo code for the producer consumer problem using semaphores has a logical error. Identify the location of the error, explain what can go wrong, and suggest a fix to eliminate the error. (Hint: you can assume that all down and up calls would be successful and not return an error code). semaphore m(1) // initialize counter to 1 semaphore s(0); // initialize counter to 0 Producer ============= sem_wait(&m) while (buffer full) { sem_post(&m); sem_wait(&s); } // insert item into the buffer sem_post(&s); sem_post(&m); Consumer ============== sem_wait(&m); while (buffer empty) { sem_post(&m); sem_wait(&s); } // remove an item from the buffer sem_post(&s); sem_post(&m);
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Write pseudocode that creates a child process, switches its…
Write pseudocode that creates a child process, switches its standard output (1) and standard error (2), and lets the child process execute a program whose name is provided as a command line argument. As an example, assume that helloworld binary’s main function is implemented as follows: int main(int argc, char **argv) { write(1,”HELLO”,6); write(2,”WORLD”,6); return 0; } Let’s assume that the binary of the code you will implement is called changingWorlds would be called as $ ./changingWorlds helloworld and after this the child process that will execute helloworld writes “HELLO” to file that was accessible through descriptor 2 in the parent process and writes “WORLD” to the file accessible through descriptor 1 in the parent process.
Firewalls are implemented using iptables rules and managed w…
Firewalls are implemented using iptables rules and managed with the iptables service or ______________service.
The____ command itself can display system activity continuo…
The____ command itself can display system activity continuously, at set intervals (every second or two), and display it on the screen.
Selecting ____________from the Authentication Configuration…
Selecting ____________from the Authentication Configuration window enables you to authenticate your users against a Microsoft Active Directory (AD) server
Any user can type _____________(with no options) to see what…
Any user can type _____________(with no options) to see what filesystems are currently running on the local Linux system.
To allow any form of writing to the vsftpd server, you must…
To allow any form of writing to the vsftpd server, you must have write__________ set in the vsftpd.conf file
The ______________ command provides a simple and straightfor…
The ______________ command provides a simple and straightforward method for changing account parameters.
NIS The___________________________ Service (NIS) was origina…
NIS The___________________________ Service (NIS) was originally created by Sun Microsystems to propagate information such as user accounts, host configuration, and other types of system information across many UNIX system.
FTP operates in a client/server model. An FTP server daemon…
FTP operates in a client/server model. An FTP server daemon listens for incoming requests (on TCP port 21) from FTP clients.