#include<stdio.h>
#include<pthread.h>
#include <semaphore.h>
#include<unistd.h>
#include <errno.h>
#include <string.h>
pthread_mutex_t mutex;
void *threadfun(void *arg)
{
printf("thread1 started\n");
pthread_mutex_lock(&mutex);
printf("thread1 after locking\n");
sleep(5);
printf("test\n");
pthread_mutex_unlock(&mutex);
return NULL;
}
void *threadfun1(void *arg)
{
int ret;
sleep(1);
ret = pthread_mutex_unlock(&mutex);
if(ret) {
printf("trying unlock error %d \n", ret);
sleep(5);
}
printf("thread2 started\n");
pthread_mutex_lock(&mutex);
printf("thread2 after locking\n");
pthread_mutex_unlock(&mutex);
return NULL;
}
int main()
{
pthread_t t1;
pthread_t t2;
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr,PTHREAD_MUTEX_ERRORCHECK);
pthread_mutex_init(&mutex,&attr);
pthread_create(&t1,NULL,threadfun,NULL);
pthread_create(&t2,NULL,threadfun1,NULL);
pthread_join(t1,NULL);
pthread_join(t2,NULL);
return 0;
}
