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makkiz [27]
2 years ago
3

Some semaphore implementations provide a function getValue() that returns the current value of a semaphore. This function may, f

or instance, be invoked prior to calling wait() so that a process will only call wait() if the value of the semaphore is > 0, thereby preventing blocking while waiting for the semaphore. For example:
if (getValue(&sem)>0
wait(&sem);

What is the problem in this approach?
Computers and Technology
1 answer:
Sindrei [870]2 years ago
5 0

Answer and Explanation:

The values of the semaphore can always be 0 for a particular process A, because whenever process A checks the

value by using getValue(&sem), some process B can be using the semaphore, after process B releases and puts

the value to 1, some other process C can get that semaphore by seeing the value > 0 and decrements its value

to 0 again. Now If the process A comes again It will see the value to be 0 again and this can go on ....

process A will never get the semaphore.

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Which bus slot provides highest video performance​
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Answer:

The best slot to use for video cards is the PCI-Express x16 slot. The next best is the AGP slot. The next best is a PCI-Express x1 slot but video cards which fit that slot are very hard to find as of late 2006. The worst choice for a video card is a PCI slot.

4 0
2 years ago
1. The precious metals needed to make computer chips, graphic cards, and transistors are found in only a small population of cou
dexar [7]

Answer:

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2 years ago
Define a structure type auto_t to represent an automobile. Include components for the make and model (strings), the odometer rea
yulyashka [42]

Answer:

see explaination

Explanation:

#include <stdio.h>

#include <string.h>

#define BUFSIZE 1000

struct auto_t scan_auto(char *);

struct date_t {

char day[2];

char month[2];

char year[4];

};

struct tank_t {

char tankCapacity[10];

char currentFuelLevel[10];

};

struct auto_t {

char make[50];

char model[50];

char odometerReading[10];

struct date_t manufactureDate;

struct date_t purchaseDate;

struct tank_t gasTank;

};

int main(int argc, char *argv[]) {

/* the first command-line parameter is in argv[1]

(arg[0] is the name of the program) */

FILE *fp = fopen(argv[1], "r"); /* "r" = open for reading */

char buff[BUFSIZE]; /* a buffer to hold what you read in */

struct auto_t newAuto;

/* read in one line, up to BUFSIZE-1 in length */

while(fgets(buff, BUFSIZE - 1, fp) != NULL)

{

/* buff has one line of the file, do with it what you will... */

newAuto = scan_auto(buff);

printf("%s\n", newAuto.make);

}

fclose(fp); /* close the file */

}

struct auto_t scan_auto(char *line) {

int spacesCount = 0;

int i, endOfMake, endOfModel, endOfOdometer;

for (i = 0; i < sizeof(line); i++) {

if (line[i] == ' ') {

spacesCount++;

if (spacesCount == 1) {

endOfMake = i;

}

else if (spacesCount == 2) {

endOfModel = i;

}

else if (spacesCount == 3) {

endOfOdometer = i;

}

}

}

struct auto_t newAuto;

int count = 0;

for (i = 0; i < endOfMake; i++) {

newAuto.make[count++] = line[i];

}

newAuto.make[count] = '\0';

count = 0;

for (i = endOfMake+1; i < endOfModel; i++) {

newAuto.model[count++] = line[i];

}

newAuto.model[count] = '\0';

count = 0;

for (i = endOfModel+1; i < endOfOdometer; i++) {

newAuto.odometerReading[count++] = line[i];

}

newAuto.odometerReading[count] = '\0';

return newAuto;

}

8 0
2 years ago
You resurrected an old worksheet. It appears to contain most of the information that you need, but not all of it. Which step sho
vagabundo [1.1K]

Answer:

The answer is "check the worksheet is not read only"

Explanation:

The read only mode is used for read the file data, and it doesn't allows the user to update the file, and for updating the worksheet we should check iut does not open in the read-only mode.

If it is open, then we close it and for close we goto the office button and click on the tools option after that goto general setting, in this there is a check box for turn off the read-only mode.

 

8 0
2 years ago
Which of the following statements regarding critical paths is true? a. On a specific project, there can be multiple critical pat
iVinArrow [24]

Answer:

Option a

Explanation:

The Critical Path Method is the arrangement of booked exercises that decides the term of the task. These planned exercises must be performed if the venture is to be viewed as a triumph.

Therefore, options b, c, d and e can't be true because:

b. Activities in the Critical Path Method has no or zero slack.

c. The duration of the critical path in CPM determined on the basis of the latest activity and the earliest initiation.

d. The CPM method schedules the activity of the longest duration.

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2 years ago
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