C Program to Implement Readers Writers Problem [Semaphores,Mutex,Threads] [System Programming]

This is the C Program to implement readers writers problem in C
In computer science, the first and second readers-writers problems are examples of a common computing problem in concurrency. The two problems deal with situations in which many threads must access the same shared memory at one time, some reading and some writing, with the natural constraint that no process may access the share for reading or writing while another process is in the act of writing to it. (In particular, it is allowed for two or more readers to access the share at the same time.) A readers-writer lock is a data structure that solves one or more of the readers-writers problems.

#include
#include #include

sem_t mutex;
sem_t db;
int readercount=0;
pthread_t reader1,reader2,writer1,writer2;
void *reader(void *);
void *writer(void *);
main()
{
sem_init(&mutex,0,1);
sem_init(&db,0,1);
while(1)
{
pthread_create(&reader1,NULL,reader,"1");
pthread_create(&reader2,NULL,reader,"2");
pthread_create(&writer1,NULL,writer,"1");
pthread_create(&writer2,NULL,writer,"2");
}
}
void *reader(void *p)
{
printf("prevoius value %dn",mutex);
......

Full code on link below
}

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https://codekeep.io/code-snippet/readers-writers-problem