Question A.1: What will the code in Figure most likely print? Explain briefly your answer. You can assume that all system call invocations are successful.
Question A.1: What will the code in Figure most likely print? Explain briefly your answer. You can assume that all system call invocations are successful.
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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Question A.1: What will the code in Figure most likely print? Explain briefly your answer. You can assume that all system call invocations are successful.
![#include <pthread.h>
#include <unistd.h>
#include <stdio.h>
int accounts [2];
pthread_mutex_t lock[2];
pthread_t tid1, tid2;
struct Transact {
int from;
int to;
int amount;
};
struct Transact ti = {.from = 0, .to = 1, .amount = 10};
{.from = 1, .to = 0, .amount = 20};
struct Transact t2
void *transfer (void *in) {
struct Transact trs = *(struct Transact*)in;
pthread_mutex_lock(&lock[trs.from]);
sleep(1);
pthread_mutex_lock(&lock[trs.to]);
accounts [trs.from]-=trs.amount;
accounts [trs.to]+=trs.amount;
pthread_mutex_unlock(&lock[trs.to]);
pthread_mutex_unlock(&lock[trs.from]);
pthread_exit(0);
int main(void) {
pthread_mutex_init(&lock[0], NULL);
pthread_mutex_init(&lock[1], NULL);
accounts [0] = 100;
accounts[1] = 100;
pthread_create(&tid1, NULL, transfer, (void*)&t1);
pthread_create (&tid2, NULL, transfer, (void*) &t2);
pthread_join(tid1, NULL);
pthread_join(tid2, NULL);
printf("%d\n", accounts[0]);](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe7070e3b-2574-4556-8552-55e9d71eb1bb%2F11814647-ebde-48a0-98f6-95f4f432fc23%2Fdkd5vb9_processed.png&w=3840&q=75)
Transcribed Image Text:#include <pthread.h>
#include <unistd.h>
#include <stdio.h>
int accounts [2];
pthread_mutex_t lock[2];
pthread_t tid1, tid2;
struct Transact {
int from;
int to;
int amount;
};
struct Transact ti = {.from = 0, .to = 1, .amount = 10};
{.from = 1, .to = 0, .amount = 20};
struct Transact t2
void *transfer (void *in) {
struct Transact trs = *(struct Transact*)in;
pthread_mutex_lock(&lock[trs.from]);
sleep(1);
pthread_mutex_lock(&lock[trs.to]);
accounts [trs.from]-=trs.amount;
accounts [trs.to]+=trs.amount;
pthread_mutex_unlock(&lock[trs.to]);
pthread_mutex_unlock(&lock[trs.from]);
pthread_exit(0);
int main(void) {
pthread_mutex_init(&lock[0], NULL);
pthread_mutex_init(&lock[1], NULL);
accounts [0] = 100;
accounts[1] = 100;
pthread_create(&tid1, NULL, transfer, (void*)&t1);
pthread_create (&tid2, NULL, transfer, (void*) &t2);
pthread_join(tid1, NULL);
pthread_join(tid2, NULL);
printf("%d\n", accounts[0]);
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