extmod/moduheapq: Revert change for adhoc relative-time queue support.
Now that specialized utimeq module has been implenented, revert previous
adhoc changes to uheapq.
This reverts commit 0cbc07227c.
This commit is contained in:
Paul Sokolovsky
parent
efa206d955
commit
ffe807f349
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@ -28,12 +28,9 @@
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#include "py/objlist.h"
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#include "py/runtime0.h"
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#include "py/runtime.h"
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#include "py/smallint.h"
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#if MICROPY_PY_UHEAPQ
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#define MODULO MICROPY_PY_UTIME_TICKS_PERIOD
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// the algorithm here is modelled on CPython's heapq.py
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STATIC mp_obj_list_t *get_heap(mp_obj_t heap_in) {
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@ -43,33 +40,12 @@ STATIC mp_obj_list_t *get_heap(mp_obj_t heap_in) {
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return MP_OBJ_TO_PTR(heap_in);
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}
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STATIC bool time_less_than(mp_obj_t item, mp_obj_t parent) {
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if (!MP_OBJ_IS_TYPE(item, &mp_type_tuple) || !MP_OBJ_IS_TYPE(parent, &mp_type_tuple)) {
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mp_raise_TypeError("");
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}
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mp_obj_tuple_t *item_p = MP_OBJ_TO_PTR(item);
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mp_obj_tuple_t *parent_p = MP_OBJ_TO_PTR(parent);
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mp_uint_t item_tm = MP_OBJ_SMALL_INT_VALUE(item_p->items[0]);
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mp_uint_t parent_tm = MP_OBJ_SMALL_INT_VALUE(parent_p->items[0]);
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mp_uint_t res = parent_tm - item_tm;
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if ((mp_int_t)res < 0) {
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res += MODULO;
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}
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return res < (MODULO / 2);
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}
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STATIC void heap_siftdown(mp_obj_list_t *heap, mp_uint_t start_pos, mp_uint_t pos, bool timecmp) {
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STATIC void heap_siftdown(mp_obj_list_t *heap, mp_uint_t start_pos, mp_uint_t pos) {
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mp_obj_t item = heap->items[pos];
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while (pos > start_pos) {
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mp_uint_t parent_pos = (pos - 1) >> 1;
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mp_obj_t parent = heap->items[parent_pos];
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bool lessthan;
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if (MP_UNLIKELY(timecmp)) {
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lessthan = time_less_than(item, parent);
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} else {
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lessthan = (mp_binary_op(MP_BINARY_OP_LESS, item, parent) == mp_const_true);
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}
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if (lessthan) {
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if (mp_binary_op(MP_BINARY_OP_LESS, item, parent) == mp_const_true) {
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heap->items[pos] = parent;
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pos = parent_pos;
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} else {
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@ -79,43 +55,32 @@ STATIC void heap_siftdown(mp_obj_list_t *heap, mp_uint_t start_pos, mp_uint_t po
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heap->items[pos] = item;
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}
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STATIC void heap_siftup(mp_obj_list_t *heap, mp_uint_t pos, bool timecmp) {
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STATIC void heap_siftup(mp_obj_list_t *heap, mp_uint_t pos) {
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mp_uint_t start_pos = pos;
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mp_uint_t end_pos = heap->len;
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mp_obj_t item = heap->items[pos];
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for (mp_uint_t child_pos = 2 * pos + 1; child_pos < end_pos; child_pos = 2 * pos + 1) {
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// choose right child if it's <= left child
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if (child_pos + 1 < end_pos) {
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bool lessthan;
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if (MP_UNLIKELY(timecmp)) {
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lessthan = time_less_than(heap->items[child_pos], heap->items[child_pos + 1]);
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} else {
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lessthan = (mp_binary_op(MP_BINARY_OP_LESS, heap->items[child_pos], heap->items[child_pos + 1]) == mp_const_true);
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}
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if (!lessthan) {
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if (child_pos + 1 < end_pos && mp_binary_op(MP_BINARY_OP_LESS, heap->items[child_pos], heap->items[child_pos + 1]) == mp_const_false) {
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child_pos += 1;
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}
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}
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// bubble up the smaller child
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heap->items[pos] = heap->items[child_pos];
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pos = child_pos;
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}
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heap->items[pos] = item;
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heap_siftdown(heap, start_pos, pos, timecmp);
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heap_siftdown(heap, start_pos, pos);
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}
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STATIC mp_obj_t mod_uheapq_heappush(size_t n_args, const mp_obj_t *args) {
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mp_obj_t heap_in = args[0];
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STATIC mp_obj_t mod_uheapq_heappush(mp_obj_t heap_in, mp_obj_t item) {
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mp_obj_list_t *heap = get_heap(heap_in);
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mp_obj_list_append(heap_in, args[1]);
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bool is_timeq = (n_args > 2 && args[2] == mp_const_true);
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heap_siftdown(heap, 0, heap->len - 1, is_timeq);
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mp_obj_list_append(heap_in, item);
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heap_siftdown(heap, 0, heap->len - 1);
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_uheapq_heappush_obj, 2, 3, mod_uheapq_heappush);
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STATIC MP_DEFINE_CONST_FUN_OBJ_2(mod_uheapq_heappush_obj, mod_uheapq_heappush);
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STATIC mp_obj_t mod_uheapq_heappop(size_t n_args, const mp_obj_t *args) {
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mp_obj_t heap_in = args[0];
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STATIC mp_obj_t mod_uheapq_heappop(mp_obj_t heap_in) {
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mp_obj_list_t *heap = get_heap(heap_in);
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if (heap->len == 0) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_IndexError, "empty heap"));
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@ -125,17 +90,16 @@ STATIC mp_obj_t mod_uheapq_heappop(size_t n_args, const mp_obj_t *args) {
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heap->items[0] = heap->items[heap->len];
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heap->items[heap->len] = MP_OBJ_NULL; // so we don't retain a pointer
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if (heap->len) {
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bool is_timeq = (n_args > 1 && args[1] == mp_const_true);
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heap_siftup(heap, 0, is_timeq);
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heap_siftup(heap, 0);
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}
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return item;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_uheapq_heappop_obj, 1, 2, mod_uheapq_heappop);
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_uheapq_heappop_obj, mod_uheapq_heappop);
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STATIC mp_obj_t mod_uheapq_heapify(mp_obj_t heap_in) {
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mp_obj_list_t *heap = get_heap(heap_in);
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for (mp_uint_t i = heap->len / 2; i > 0;) {
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heap_siftup(heap, --i, false);
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heap_siftup(heap, --i);
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}
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return mp_const_none;
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}
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@ -1,94 +0,0 @@
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# Test adhoc extension to uheapq to support wraparound
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# time (utime.ticks_ms() style) task queue.
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from utime import ticks_add, ticks_diff
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import uheapq as heapq
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DEBUG = 0
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MAX = ticks_add(0, -1)
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MODULO_HALF = MAX // 2 + 1
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if DEBUG:
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def dprint(*v):
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print(*v)
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else:
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def dprint(*v):
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pass
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# Try not to crash on invalid data
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h = []
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heapq.heappush(h, 1)
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try:
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heapq.heappush(h, 2, True)
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assert False
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except TypeError:
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pass
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heapq.heappush(h, 2)
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try:
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heapq.heappop(h, True)
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assert False
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except TypeError:
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pass
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def pop_all(h):
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l = []
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while h:
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l.append(heapq.heappop(h, True))
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dprint(l)
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return l
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def add(h, v):
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heapq.heappush(h, (v, None), True)
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h = []
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add(h, 0)
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add(h, MAX)
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add(h, MAX - 1)
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add(h, 101)
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add(h, 100)
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add(h, MAX - 2)
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dprint(h)
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l = pop_all(h)
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for i in range(len(l) - 1):
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diff = ticks_diff(l[i + 1][0], l[i][0])
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assert diff > 0
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def edge_case(edge, offset):
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h = []
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add(h, ticks_add(0, offset))
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add(h, ticks_add(edge, offset))
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dprint(h)
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l = pop_all(h)
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diff = ticks_diff(l[1][0], l[0][0])
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dprint(diff, diff > 0)
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return diff
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dprint("===")
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diff = edge_case(MODULO_HALF - 1, 0)
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assert diff == MODULO_HALF - 1
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assert edge_case(MODULO_HALF - 1, 100) == diff
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assert edge_case(MODULO_HALF - 1, -100) == diff
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# We expect diff to be always positive, per the definition of heappop() which should return
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# the smallest value.
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# This is the edge case where this invariant breaks, due to assymetry of two's-complement
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# range - there's one more negative integer than positive, so heappushing values like below
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# will then make ticks_diff() return the minimum negative value. We could make heappop
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# return them in a different order, but ticks_diff() result would be the same. Conclusion:
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# never add to a heap values where (a - b) == MODULO_HALF (and which are >= MODULO_HALF
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# ticks apart in real time of course).
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dprint("===")
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diff = edge_case(MODULO_HALF, 0)
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assert diff == -MODULO_HALF
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assert edge_case(MODULO_HALF, 100) == diff
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assert edge_case(MODULO_HALF, -100) == diff
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dprint("===")
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diff = edge_case(MODULO_HALF + 1, 0)
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assert diff == MODULO_HALF - 1
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assert edge_case(MODULO_HALF + 1, 100) == diff
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assert edge_case(MODULO_HALF + 1, -100) == diff
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print("OK")
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@ -1 +0,0 @@
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OK
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