#include<pthread.h>
#include<stdio.h>
#include<string.h>
#include<unistd.h>
pthread_rwlock_t rwlock = PTHREAD_RWLOCK_INITIALIZER;
struct data {
int n;
char name[10];
}obj;
void *writethread(void *arg)
{
printf("write thread started\n");
pthread_rwlock_wrlock(&rwlock);
strcpy(obj.name, "hi");
obj.n = 1;
pthread_rwlock_unlock(&rwlock);
printf("writing done\n");
return NULL;
}
void *read1thread(void *arg)
{
sleep(3);
printf("read 1 thread started \n");
pthread_rwlock_rdlock(&rwlock);
printf("%s\n", obj.name);
printf("%d\n", obj.n);
pthread_rwlock_unlock(&rwlock);
printf("thread 2 release mutex object\n");
return NULL;
}
void *read2thread(void *arg)
{
sleep(5);
printf("read 2 thread started \n");
pthread_rwlock_rdlock(&rwlock);
printf("%s\n", obj.name);
printf("%d\n", obj.n);
pthread_rwlock_unlock(&rwlock);
printf("thread 3 release mutex object\n");
return NULL;
}
int main()
{
pthread_t t1, t2, t3;
void *res;
pthread_create(&t1,NULL,writethread,NULL);
pthread_create(&t2,NULL,read1thread,NULL);
pthread_create(&t3,NULL,read2thread,NULL);
pthread_join(t1, &res);
pthread_join(t2, &res);
pthread_join(t3, &res);
return 0;
}
