The readers-writers problem has several variations, all involving priorities.This synchronization problem is referred to as the readers-writers problem. To ensure that these difficulties do not arise, we require that the writers have exclusive access to the shared database.However, if a writer and some other thread (either a reader or a writer) access the database simultaneously, there could be some synchronization issues.
If two readers access the shared data simultaneously, no adverse affects will result.Some of these processes may want only to read the database (readers), whereas others may want to update (that is, to read and write) the database (writers).A database is to be shared among several concurrent processes.Please use the below link for downloading source code.Next: The Dining-Philosophers Problem Up: Classic Problems of Synchronization Previous: The Bounded-Buffer Problem Printf("\nwriter%d finished writing\n",c) Printf("\nreader%d finished reading\n",c) Pthread_create(&w3,NULL,writer,(void *)b) Pthread_create(&r3,NULL,reader,(void *)a) Pthread_create(&w2,NULL,writer,(void *)b) Pthread_create(&r2,NULL,reader,(void *)a) Pthread_create(&w1,NULL,writer,(void *)b) Pthread_create(&w,NULL,writer,(void *)b) Pthread_create(&r1,NULL,reader,(void *)a) Pthread_create(&r,NULL,reader,(void *)a) Reader Writer problem using Reader Priority code can be found here. So we can say that it is a way in which we should handle the reader and writer. Only the read or write permission will be given based on these variables. We have declared two variables named as reading count and write count which will count the read and write to control the synchronization problem. Reader-writer code can be implemented in C on Linux. Here is the Source Code for writer priority using C under reader and writer problem. Readers-writers problem is Mutual Exclusion and Synchronization problem which can solve by semaphores and monitors.
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