Homework Answers
The answer is NO for the questions E F G H. The thread based programme cannot include any of the output given in the question in the given order.
Explanation for the Answer of E F G H :
Initially value of J is set to 1 in main function and value of buffer string is set to "Blue" After creating the thread B using "pthread_create()" function the value of J is printed which is 1 at this point so current output becomes like this
OUTPUT
A: j=1
After the values of I is changed to 200 and value of J is changed to 2. Then the string buffer is printed. So current output becomes:
OUTPUT
A: j=1
A: buffer=Blue
Then value of J is changed to 4 and using the pthread_join function the control is sent to "tfuc" function. There value of J is changed to 0. And values of I and J is printed twice. So current output becomes
OUTPUT
A: j=1
A: buffer=Blue
B: i=200, j=0
B: i=200, j=0
Then value of J is changed to 3 and value of string buffer is changed to "red" and the thread exits and the programme returns to main function and terminates.
So none of the given output pattern matches with the output of the programme and hence the answer is NO for all of them.
FINAL OUTPUT:
- O 0 C:\Users\KIIT\Documents Untitled 1.exe A: j=1 A: buffer=Blue B: i=200, j=0 B: i=200, j=0 - - - - -- --- - - - - - -- - - - - - -- - Process exited after 2.678 seconds with return value 3221225477 Press any key to continue...
- O 0 C:\Users\KIIT\Documents Untitled 1.exe A: j=1 A: buffer=Blue B: i=200, j=0 B: i=200, j=0 - - - - -- --- - - - - - -- - - - - - -- - Process exited after 2.678 seconds with return value 3221225477 Press any key to continue...
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something like this
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thr_data[i].tid = i;
if ((rc = pthread_create(&thr[i], NULL, thr_func,
&thr_data[i]))) {
fprintf(stderr, "error: pthread_create, rc: %d\n", rc);
return EXIT_FAILURE;
::::::::: CODE :::::::::::::
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
int sharedVar = 0;
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
/* thread handler */
void *threadHandler(void *vargp)
{
int i = 0;
pthread_mutex_lock(&mutex);
...
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Pleas help I need to create and array to add to my code
something like this
for (i = 0; i < NUM_THREADS; ++i) {
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if ((rc = pthread_create(&thr[i], NULL, thr_func,
&thr_data[i]))) {
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return EXIT_FAILURE;
::::::::: CODE :::::::::::::
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pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
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