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#ifndef PRIO_QUEUE_H #define PRIO_QUEUE_H /* * A priority queue implementation, primarily for keeping track of * commits in the 'date-order' so that we process them from new to old * as they are discovered, but can be used to hold any pointer to * struct. The caller is responsible for supplying a function to * compare two "things". * * Alternatively, this data structure can also be used as a LIFO stack * by specifying NULL as the comparison function. */ /* * Compare two "things", one and two; the third parameter is cb_data * in the prio_queue structure. The result is returned as a sign of * the return value, being the same as the sign of the result of * subtracting "two" from "one" (i.e. negative if "one" sorts earlier * than "two"). */ typedef int (*prio_queue_compare_fn)(const void *one, const void *two, void *cb_data); struct prio_queue { prio_queue_compare_fn compare; void *cb_data; int alloc, nr; void **array; }; /* * Add the "thing" to the queue. */ extern void prio_queue_put(struct prio_queue *, void *thing); /* * Extract the "thing" that compares the smallest out of the queue, * or NULL. If compare function is NULL, the queue acts as a LIFO * stack. */ extern void *prio_queue_get(struct prio_queue *); extern void clear_prio_queue(struct prio_queue *); /* Reverse the LIFO elements */ extern void prio_queue_reverse(struct prio_queue *); #endif /* PRIO_QUEUE_H */
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