uas_thread_2

yudiwibisono

Jun 22nd, 2022

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// kunci jawaban uas thread
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
int counter1=0,counter2=5;
const int LIMIT1 = 5;
const int LIMIT2 = 10;
int data[10];
pthread_mutex_t lock;
void *fung1(void *vargp)
{
printf("\n Thread isian 1 mulai\n");
while (counter1<LIMIT1) {
//
// sebelum lock, di bagian ini bisa pindah ke thread lain
//
for (int i = 0; i<=1000;i++) {printf("x");} //code contoh, nanti x,y,a,b bisa diprint tidak berurutan
pthread_mutex_lock(&lock); //lock, dijamin tdk akan pindah ke thread lain
printf("Mengisi 1 di posisi %d \n",counter1);
data[counter1] = 1;
counter1++;
pthread_mutex_unlock(&lock); //unlock
//
// setelah lock, di bagian ini bisa pindah ke thread lain
//
for (int i = 0; i<=1000;i++) {printf("y");} //code contoh, nanti x,y,a,b bisa diprint tidak berurutan
}
return NULL;
}
void *fung2(void *vargp)
{
printf("\n Thread isian 2 mulai\n");
while (counter2<LIMIT2) {
//
// sebelum lock, di bagian ini bisa pindah ke thread lain
//
for (int i = 0; i<=1000;i++) {printf("a");} //code contoh, nanti x,y,a,b bisa diprint tidak berurutan
pthread_mutex_lock(&lock); //lock, dijamin tdk akan pindah ke thread lain
printf("Mengisi 2 di posisi %d \n",counter2);
data[counter2] = 2;
counter2++;
pthread_mutex_unlock(&lock); //unlock
//
// setelah lock, di bagian ini bisa pindah ke thread lain
//
for (int i = 0; i<=1000;i++) {printf("b");} //code contoh, nanti x,y,a,b bisa diprint tidak berurutan
}
return NULL;
}
int main()
{
pthread_t t1,t2;
//init mutex
if (pthread_mutex_init(&lock, NULL) != 0)
{
printf("\n mutex init gagal\n");
return 1;
}
pthread_create(&t1, NULL, fung1, NULL);
pthread_create(&t2, NULL, fung2, NULL);
pthread_join(t1, NULL);
pthread_join(t2, NULL);
//pengisian selesai, print data
for (int i=0;i<=9;i++) {
printf("data ke %d = %d\n",i,data[i]);
}
//destroy mutex
pthread_mutex_destroy(&lock);
exit(0);
}

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