Question

Pleas help I need to create and array to add to my code

something like this

for (i = 0; i < NUM_THREADS; ++i) {
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);
   for (i = 0; i < 6; i++)
       sharedVar++;
   printf("Thread [%ld] has finished\n", pthread_self());
   pthread_mutex_unlock(&mutex);
}

int main()
{
   pthread_t thread_id[10];
   int i ;
   /* create thread array */
   for (i = 0; i < 10; i++)
   {
       pthread_create(&thread_id[i], NULL, threadHandler, NULL);
   }
   /* wait for exit thread */
   pthread_join(thread_id[0], NULL);
   pthread_join(thread_id[1], NULL);
   pthread_join(thread_id[2], NULL);
   pthread_join(thread_id[3], NULL);
   pthread_join(thread_id[4], NULL);
   pthread_join(thread_id[5], NULL);
   pthread_join(thread_id[6], NULL);
   pthread_join(thread_id[7], NULL);
   pthread_join(thread_id[8], NULL);
   pthread_join(thread_id[9], NULL);
   /* print shared variable */
   printf("Shared Variable - %d\n", sharedVar);

}

I need this output

printf("Final shared valu 71 return EXIT_SUCCESS; 73 ) Thread ID(O) has finished Thread ID(1) has finished Thread ID(4) has finished Thread ID(3) has finished Thread ID(2) has finished Thread ID(6) has finished Thread ID(6) has finished Thread ID(7) has finished Thread ID(8) has finished Thread ID(9) has finished Final shared value: 270 Program ended with exit code: el All Output

Answer 1

SOURCE CODE:

*Please follow the comments to better understand the code.

**Please look at the Screenshot below and use this code to copy-paste.

***The code in the below screenshot is neatly indented for better understanding.

#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);
for (i = 0; i < 6; i++)
sharedVar++;
// print the name of the thread here.
printf("Thread ID(%d) has finished\n",(char*)vargp);
pthread_mutex_unlock(&mutex);
}

int main()
{
pthread_t thread_id[10];
int i ;
/* create thread array */
for (i = 0; i < 10; i++)
{
// Here set the name of the thread
char *name = (char*)i;
// pass the name here
pthread_create(&thread_id[i], NULL, threadHandler, name);
}
/* wait for exit thread */
pthread_join(thread_id[0], NULL);
pthread_join(thread_id[1], NULL);
pthread_join(thread_id[2], NULL);
pthread_join(thread_id[3], NULL);
pthread_join(thread_id[4], NULL);
pthread_join(thread_id[5], NULL);
pthread_join(thread_id[6], NULL);
pthread_join(thread_id[7], NULL);
pthread_join(thread_id[8], NULL);
pthread_join(thread_id[9], NULL);
/* print shared variable */
printf("Shared Variable - %d\n", sharedVar);

}

ها main.c #include <stdio.h> 2 #include <stdlib.h> 3 #include <unistd.h> 4 #include <pthread.h> 5 6 int sharedvar = 0; 7 pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; 8 /* thread handler */ 9 void *threadHandler(void *vargp) 10 { 11 int i = 0; 12 pthread_mutex_lock(&mutex); 13 for (i = 0; i < 6; i++) 14 sharedvar++; 15 // print the name of the thread here. 16 printf("Thread ID(%) has finished\n",(char*)vargp); 17 pthread_mutex_unlock(&mutex); 18 19 20 int main() 21 { 22 pthread_t thread_id[10]; 23 int i; 24 /* create thread array */ 25 for (i = 0; i < 10; i++) 26 27 // Here set the name of the thread 28 char *name = (char*)i; 29 // pass the name here 30 pthread_create(&thread_id[i], NULL, threadHandler, name); 31 } 32 /* wait for exit thread */ 33 pthread_join(thread_id[0], NULL); 34 pthread_join(thread_id[1], NULL); 35 pthread_join(thread_id[2], NULL); 36 pthread_join(thread_id[3], NULL); 37 pthread_join(thread_id[4], NULL); 38 pthread_join(thread_id[5], NULL); 39 pthread_join(thread_id[6], NULL); 40 pthread_join(thread_id[7], NULL); 41 pthread_join(thread_id[8], NULL); 42 pthread_join(thread_id[9], NULL); 43 /* print shared variable */ 44 printf("shared Variable - %d\n", sharedvar); 45 46 } { 47

OUTPUT:

Thread ID(0) has finished Thread ID(3) has finished Thread ID(2) has finished Thread ID(5) has finished Thread ID(6) has finished Thread ID(7) has finished Thread ID(8) has finished Thread ID(9) has finished Thread ID(1) has finished Thread ID(4) has finished Shared Variable - 60 ... Program finished with exit code o Press ENTER to exit console.]

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