Sem_init is not working on Mac OSX 10.6.4(Snow Leopard)

I am writing code that will solve readers writers problem but when i use sem_init to initialise unnamed semaphore,
it returns -1 my code is
sem_t sem;
main()
     int ret;
     ret = sem_init(&sem, 0, 1);
     printf("Return  %d\n", ret);
Is there any mistake with my code please let me know.If not provide me with suggestions to solve this problem?

@etresoft Thanks. I get my solution by sem_unlink before sem_init or sem_open
But why mac developers had done such unimplemented stuff. It becomes difficult to even get one simple
example to understand the concept or to get started?

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