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#ifndef FIFO_H
#define FIFO_H
typedef struct fifo Fifo;
typedef void (*FifoUserFreeFunction) (void *item_data);
Fifo* fifo_new(void);
void fifo_free(Fifo* self, FifoUserFreeFunction data_free);
void fifo_push(Fifo* self, void* data);
void* fifo_pop(Fifo* self);
void* fifo_peek_first(Fifo *queue);
void* fifo_peek_last(Fifo *queue);
#endif // FIFO_H