When consuming a priority queue, it can be convenient to inspect
the next object that will be dequeued without actually dequeueing
it. Our existing library did not have such a 'peek' operation, so
add it as prio_queue_peek().
Add a reference-level comparison in t/helper/test-prio-queue.c
so this method is exercised by t0009-prio-queue.sh. Further, add
a test that checks the behavior when the compare function is NULL
(i.e. the queue becomes a stack).
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Traditionally we used a singly linked list of commits to hold a set
of in-flight commits while traversing history. The most typical use
of the list is to add commits that are newly discovered to it, keep
the list sorted by commit timestamp, pick up the newest one from the
list, and keep digging. The cost of keeping the singly linked list
sorted is nontrivial, and this typical use pattern better matches a
priority queue.
Introduce a prio-queue structure, that can be used either as a LIFO
stack, or a priority queue. This will be used in the next patch to
hold in-flight commits during sort-in-topological-order.
Tests and the idea to make it usable for any "void *" pointers to
"things" are by Jeff King. Bugs are mine.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
