/* * tsh - A tiny shell program with job control * * */
#include
#include
#include
#include
#include
#include
#include
#include
#include
/* Misc manifest constants */
#define MAXLINE 1024 /* max line size */
#define MAXARGS 128 /* max args on a command line */
#define MAXJOBS 16 /* max jobs at any point in time */
#define MAXJID 1< ST : ctrl-z * ST -> FG : fg command * ST -> BG : bg command * BG -> FG : fg command * At most 1 job can be in the FG state. */
/* Global variables */ extern char **environ; /* defined in libc */ char prompt[] = "tsh> "; /* command line prompt (DO NOT CHANGE) */ int verbose = 0; /* if true, print additional output */ int nextjid = 1;
…show more content…
oid handler_t(int); handler_t *Signal(int signum, handler_t *handler);
/* * main - The shell's main routine */ int main(int argc, char **argv)
{
char c; char cmdline[MAXLINE]; int emit_prompt = 1; /* emit prompt (default) */
/* Redirect stderr to stdout (so that driver will get all output * on the pipe connected to stdout) */ dup2(1, 2);
/* Parse the command line */ while ((c = getopt(argc, argv, "hvp")) != EOF) { switch (c) { case 'h': /* print help message */ usage(); break; case 'v': /* emit additional diagnostic info */ verbose = 1; break; case 'p': /* don't print a prompt */ emit_prompt = 0; /* handy for automatic testing */ break; default: usage(); } }
/* Install the signal handlers */
/* These are the ones you will need to implement */ Signal(SIGINT, sigint_handler); /* ctrl-c */ Signal(SIGTSTP, sigtstp_handler); /* ctrl-z */ Signal(SIGCHLD, sigchld_handler); /* Terminated or stopped child */
/* This one provides a clean way to kill the shell */ Signal(SIGQUIT, sigquit_handler);
/* Initialize the job list */ initjobs(jobs);
/* Execute the shell's read/eval loop */ while (1) {
/* Read command line */ if (emit_prompt) { printf("%s", prompt); fflush(stdout); } if ((fgets(cmdline, MAXLINE, stdin) == NULL) && ferror(stdin))
What key sequence can you use to repeat the last command, which was used to print the file?
#include #include #include // #define NUM_THREADS 2 /* create thread argument struct for thr_func() */ typedef struct _thread_data_t { int tid; double stuff; } thread_data_t; /* thread function */ void *thr_func(void *arg) { thread_data_t *data = (thread_data_t *)arg; printf("Time Interval \t Arrival Threads \t working Threads \t Finish Threads \n"); pthread_exit(NULL); } int main(int argc, char **argv) { int NUM_THREADS ; int Arrival_Time; int cpu_Time; printf("Enter the total number of threads (1 to 50):\t"); scanf("%i",NUM_THREADS,"\n"); pthread_t thr[NUM_THREADS]; int i, rc; /* create a thread_data_t argument array */ thread_data_t thr_data[NUM_THREADS]; /* create threads */ for (i = 0; i <
3.8) Short term scheduler or CPU scheduler: selects a process from the processes (that are in memory) that are ready to execute and allocates the CPU to it.
3.1 Using the program shown in Figure 3.30 explain what the output will be at Line A.
Off course I had a challenge in the processing time, because of interruption from my system and my function in fact not well processing for on my coding system either way. The steps that must be performed the program has stopped solve my solutions; this was one of the challenge I had in the unit. But overall it is amazing unit of the beginning of
Chase, Jacobs and Aquilano pose questions such as, “How many paint defects are there in the finish of a car? [and] Have we improved our painting process by installing a new sprayer?” These questions are meant to investigate and apply different techniques that we can use to improve the quality of life. Quality control not only applies to manufacturing techniques, it can also be applied to everyday life. This discussion will focus on a specific method of quality control called statistical process control that will ensure my morning process is effective.
For each task, list one question you have about what to submit and/or what each of the prompts is asking.
While the command is executing, the shell waits for the process to finish. Or sleeps
I propose that our company consider implementing Linux for our servers and workstations. There are many excellent reasons to employ Linux as the operating system of choice for our company: Linux is ‘tried and true’; is used by many large companies, such as Google©, Amazon©, Facebook©, and many of the cloud service providers; is less expensive; more reliable and stable; has extensive free community support; uses memory and CPU resources more efficiently; is reasonably easy and quick to install; and is much less vulnerable to viruses and malware than the Microsoft Windows© operating system. Linux can be used on almost any type or brand of computer or server, including older models. I will demonstrate that Linux is a viable and less expensive alternative to Windows and will perform well in our server and workstation environments.
outside, it's more like TOPS-10, except that the prompt is a @ instead of a
A business like ours that offers online services, it is very vital run an operating system that properly meets the needs of our kind of business operations. Such an Operating system gives our business opportunities to render services uniquely. It makes our organization to have its own way of dealing with its customers giving us a good reputation on the market. For a business operating system to be more effective, it must go beyond the people who are doing and managing the work. As a result of transcending beyond, it makes the system to be more valuable. Since online business operates without the being physically present, it makes the customers to be free and interact with the system. In addition, partners such as financial organization who
Taking ti as process time; PTi as set of precede task; STi as set of succeed task, value of ct and an upper bound on
5. When the processing is complete the CPU reloads the previously suspended program’s registers/commands/data, and processing continues from where it left off.
Ah come on. Sergei looked at his watch. 17:58. So close to the end of his shift. Screwing a single screw into engines, with no explanation what it does. Over and over and over. 10 hours a day. 8:00 to 18:00. No breaks. No lunch. No anything. Day after day after day. Of course, the next person in the assembly line didn't screw in the same screw. They screw in a different screw over and over again for 10 hours a day. Speaking of people next to him in the assembly line, that idiot next to him is blabbing about nothing again. "Oh, look! It's almost the end of our shift! That makes me sad," said the person before him in the assembly line, whose name Sergei does not know, nor does he care. Sergei looked around at the familiar, VERY familiar,
parameter lpm_hint = "UNUSED"; input clock; input clken; input aclr; input [lpm_widtha-1:0] dataa; input [lpm_widthb-1:0] datab; input [lpm_widths-1:0] sum; output [lpm_widthp-1:0] result;