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#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int m;
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
void*
fn_t1(void* arg)
{
int xrand;
while (1) {
pthread_mutex_lock(&mutex);
if (m >= 1 && m <= 5) {
xrand = (rand() % 10) + 1;
printf("Thread 1: (m = %d, xrand = %d)\n", m, xrand);
m = xrand;
pthread_cond_signal(&cond);
} else {
pthread_cond_wait(&cond, &mutex);
}
pthread_mutex_unlock(&mutex);
}
pthread_exit(NULL);
}
void*
fn_t2(void* arg)
{
int xrand;
while (1) {
pthread_mutex_lock(&mutex);
if (m >= 6 && m <= 10) {
xrand = (rand() % 10) + 1;
printf("\t\t\tThread 2: (m = %d, xrand = %d)\n", m, xrand);
m = xrand;
pthread_cond_signal(&cond);
} else {
pthread_cond_wait(&cond, &mutex);
}
pthread_mutex_unlock(&mutex);
}
pthread_exit(NULL);
}
int
main()
{
pthread_t th[2];
srand(time(NULL));
m = (rand() % 10) + 1;
pthread_create(&th[0], NULL, (void*)&fn_t1, NULL);
pthread_create(&th[1], NULL, (void*)&fn_t2, NULL);
pthread_join(th[0], NULL);
pthread_join(th[1], NULL);
return 0;
}
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