Try switching the joins pthread_join(tid2, NULL); pthread_join(tid1, NULL); Do you see any difference? Please report if and why you do or do not see any difference in terms of the randomness in the result of the shared resource. In the inc_dec_resource() function, implement mutual exclusion (pthread_mutex_lock) to ensure that the result becomes 0 every time when you execute your program. Put your updated code in the report (highlighted) and show your screenshot of the execution by running the script three time using $ time ./shared_resource_mutex. Hint: Your loop is incrementing/decrementing the resource which should be protected by each thread while it is executing that portion. #include #include #define iterations 300000000 long long shared_resource = 0; pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; // Thread function to modify shared resource void* inc_dec_resource(void* arg){ //get the pointer from main thread and dereference it to put the value in resource_value int resource_value = (int ) arg; for(int i=0; i < iterations; i++){ shared_resource += resource_value; } pthread_exit(NULL); } int main(void){ // Thread 1 to increment shared resource pthread_t tid1, tid2; int value1 = 1; pthread_create(&tid1, NULL, inc_dec_resource, &value1); // Thread 2 to increment shared resource int value2 = -1; pthread_create(&tid2, NULL, inc_dec_resource, &value2); pthread_join(tid1, NULL); pthread_join(tid2, NULL); printf("Shared resource value: %lld\n", shared_resource); return 0;

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Related questions

Question

Try switching the joins

pthread_join(tid2, NULL);

pthread_join(tid1, NULL);

Do you see any difference? Please report if and why you do or do not see any difference in terms of the randomness in the result of the shared resource.

In the inc_dec_resource() function, implement mutual exclusion (pthread_mutex_lock) to ensure that the result becomes 0 every time when you execute your program. Put your updated code in the report (highlighted) and show your screenshot of the execution by running the script three time using $ time ./shared_resource_mutex. Hint: Your loop is incrementing/decrementing the resource which should be protected by each thread while it is executing that portion.

#include <stdio.h>

#include <pthread.h>

#define iterations 300000000

long long shared_resource = 0;

pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;

// Thread function to modify shared resource

void* inc_dec_resource(void* arg){

//get the pointer from main thread and dereference it to put the value in resource_value

int resource_value = *(int *) arg;

for(int i=0; i < iterations; i++){

shared_resource += resource_value;

}