void merge(int num_threads, int length, pivot_data *before_merge, int* merged){
//printf("In merge num_threads %d\n", num_threads);
int i;
for(i=0; i<num_threads; i++){
before_merge[i].ctr=0;
//printf("i %d length %d\n", i, before_merge[i].length);
}
//printf("length %d\n", length);
int ctr = 0;
pivot_data* dq;
PQueue *pq = pqueue_new(heap_compare_pivots, num_threads);
for(i=0; i<num_threads; i++){
pqueue_enqueue(pq, &before_merge[i]);
//printf("Enqueue %d\n", before_merge[i].pivots[0]);
}
while(pq->size != 0){
dq = (pivot_data*)pqueue_dequeue(pq);
//printf("Dequeue %d\n", dq->pivots[dq->ctr]);
merged[ctr++] = dq->pivots[dq->ctr++];
if(dq->ctr != dq->length){
pqueue_enqueue(pq, dq);
//printf("Enqueue %d\n", dq->pivots[dq->ctr]);
}
}
pqueue_delete(pq);
aligned_free(before_merge);
}
int main(int argc, char ** argv) {
int nElements, i, q, j;
struct {
char (*compare) (pq_element, pq_element);
uint8_t size;
uint8_t n_elements;
pq_element heap[10];
} pqt;
nElements = argc -1;
pqueue_init(&pqt, 10, compare);
for (j=0; j < 10; j++) {
pqt.heap[j] = -1;
}
for (i=0; i < nElements; i++) {
q = atoi(argv[i+1]);
printf("%d %d\n", q, pqueue_enqueue(&pqt, q));
for (j=0; j < 10; j++) {
printf("%d ", pqt.heap[j]);
}
printf("\n");
}
for (i=0; i < nElements; i++) {
printf("%d\n", pqueue_dequeue(&pqt));
}
for (j=0; j < 10; j++) {
printf("%d ", pqt.heap[j]);
}
printf("\n");
}
void mylib_barrier_calculate_pivots (struct barrier_node*b, int num_threads)
{
pthread_mutex_lock(&(b -> count_lock));
b -> count ++;
if (b -> count == num_threads) {
b -> count = 0;
//This code should be executed by only one thread.
int *merged_samples = (int*)malloc(sizeof(int)*num_threads*num_threads);
int i = 0 , k= 0;
PQueue*heap = pqueue_new(compare_heap_key,num_threads);
for(;i<num_threads;++i)
{
if(samples_arr[i].count > 0 )
{
pqueue_enqueue(heap,samples_arr + i);
}
}
struct sample_size*ptr;
while((ptr = pqueue_dequeue(heap)) != NULL)
{
merged_samples[k++] = ptr->addr[ptr->current_index++];
if(ptr->current_index < ptr->count)
{
pqueue_enqueue(heap,ptr);
}
}
if(DEBUG_1)
{
puts("In merged samples");
for(i=0;i<k;++i)
{
printf("%d ",merged_samples[i]);
}
}
//Find the p-1 pivots
pivots = (int*)malloc(sizeof(int) * (num_threads - 1));
int pby2 = num_threads/2 - 1;
for(i = 1;i < num_threads;++i)
{
int index = i*num_threads + pby2;
if(index >= k)
{
break;
}
//Store unique pivots only.
if(!total_pivots ||( pivots[total_pivots - 1] != merged_samples[index]))
{
pivots[total_pivots++] = merged_samples[index];
}
}
//free(merged_samples);
pthread_cond_broadcast(&(b -> ok_to_proceed));
}
else
while (pthread_cond_wait(&(b -> ok_to_proceed),
&(b -> count_lock)) != 0);
pthread_mutex_unlock(&(b -> count_lock));
}
graph_t kruskal(graph_t graph) {
graph_t result = graph_empty(graph_vertices_count(graph));
unsigned int L, R, num_edges = graph_edges_count(graph);
vertex_t l = NULL, r = NULL;
pqueue_t Q = pqueue_empty(num_edges);
union_find_t C = union_find_create(graph_vertices_count(graph));
edge_t E = NULL, *edges = graph_edges(graph);
for (unsigned int i = 0; i < num_edges; i++) {
pqueue_enqueue(Q, edges[i]);
}
free(edges);
edges = NULL;
while (!pqueue_is_empty(Q) && union_find_count(C) > 1) {
E = edge_copy(pqueue_fst(Q));
l = edge_left_vertex(E);
r = edge_right_vertex(E);
L = union_find_find(C, vertex_label(l));
R = union_find_find(C, vertex_label(r));
if (L != R) {
union_find_union(C, L, R);
E = edge_set_primary(E, true);
} else {
E = edge_set_primary(E, false);
}
result = graph_add_edge(result, E);
pqueue_dequeue(Q);
}
while (!pqueue_is_empty(Q)) {
E = edge_copy(pqueue_fst(Q));
pqueue_dequeue(Q);
E = edge_set_primary(E, false);
result = graph_add_edge(result, E);
}
Q = pqueue_destroy(Q);
C = union_find_destroy(C);
return result;
}
int main() {
unsigned int maxSize = 10;
pqueue_t pq = pqueue_empty(maxSize);
bool exit = false;
char *option = NULL;
unsigned int *u = calloc(1,sizeof(unsigned int));
unsigned int v;
do {
option = print_menu();
switch(*option) {
case ADD:
printf("\nPor favor ingrese el nodo: ");
if(!pqueue_is_full(pq)) {
scanf("%u",&v);
*u = v;
pqueue_enqueue(pq, *u);
printf("\nExito.\n");
} else {
printf("La cola esta llena\n");
}
break;
case SHOW:
if(!pqueue_is_empty(pq)) {
*u = pqueue_fst(pq);
printf("\nEl maximo es: %u\n",*u);
} else {
printf("La cola está vacia\n");
}
break;
case POP:
if(!pqueue_is_empty(pq)) {
pqueue_dequeue(pq);
printf("\nSe elimino correctamente\n");
}
break;
case EXIT:
exit = true;
break;
}
free(option);
option = NULL;
} while(!exit);
pq = pqueue_destroy(pq);
}
/*
* Checks all available alarms and runs their handlers
*/
void check_alarms() {
alarm_id a;
alarm_t alarm;
// Keep checking queue until we find an alarm that should not execute
while (pqueue_peek(alarm_pqueue, &a) == 0) {
alarm = (alarm_t) a;
if (time_ticks * PERIOD >= alarm->time) {
// Executes the alarm
pqueue_dequeue(alarm_pqueue, &a);
alarm = (alarm_t) a;
alarm->func(alarm->arg);
free(alarm); // Frees alarm after execution
} else {
break;
}
}
}
int main()
{
pqueue_t* q = pqueue_create();
if (q == NULL) {
fprintf(stderr, "Failed to create a pqueue.\n");
return EXIT_FAILURE;
}
size_t n = 100000;
interval_bound_t* xs = malloc(n * sizeof(interval_bound_t));
memset(xs, 0, n * sizeof(interval_bound_t));
size_t i;
for (i = 0; i < n; ++i) {
xs[i].start_min = 100000.0 * ((double) rand() / (double) RAND_MAX);
xs[i].end_max = xs[i].start_min + 1000.0 * ((double) rand() / (double) RAND_MAX);
xs[i].x_max = (double) rand() / (double) RAND_MAX;
pqueue_enqueue(q, &xs[i]);
}
sort_interval_bounds_asc(xs, n);
interval_bound_t x;
for (i = 0; i < n; ++i) {
if (!pqueue_dequeue(q, &x)) {
fprintf(stderr, "Pqueue was prematurely empty.\n");
return EXIT_FAILURE;
}
if (memcmp(&xs[i], &x, sizeof(interval_bound_t)) != 0) {
fprintf(stderr, "Pop number %zu was incorrect.\n", i);
return EXIT_FAILURE;
}
}
pqueue_free(q);
return EXIT_SUCCESS;
}
/**
* Solve given instance of the knapsack problem using a branch and bound
* approach.
* TODO: the solution presented below represents a "rough" attempt and is not
* in anyway optimized.
* TODO: solution in terms of which items are picked along the optimal path
* could easily be recovered by associating with each node a bitvector
* encoding the decision made along the tree in order to arrive at that
* particular node (e.g., for the node encoding that we did not take
* the first item, but took the second and third items, the node's bit vector
* would be equal to 011)
*/
static char *
solve_knapsack_instance_bb(int n, int K, Item *items) {
PQueue *pq;
Node *u, *v;
Item tmp;
int maxvalue;
char *sol = malloc(128 * sizeof(char));
pq = pqueue_init(n, node_get_bound);
v = malloc(sizeof(Item));
if (!v) allocation_error();
v->level = -1;
v->value = 0;
v->weight = 0;
pqueue_enqueue(pq, (void *) v);
/* While priority queue is not empty ... */
while (pq->nElements > 1) {
pqueue_dequeue(pq, (void **) &v, NULL);
v->bound = bound(n, K, items, v);
DEBUG_PRINT("maxvalue: %d\t v->bound: %f", maxvalue, v->bound);
if (v->bound > maxvalue) {
/* Set u to be child that includes next item. */
/* Better solution: preallocate and dynamically grow
* array of Items to be used as nodes in search tree */
u = malloc(sizeof(Node));
if (!u) allocation_error();
u->level = v->level + 1;
u->weight = v->weight + items[u->level].weight;
u->value = v->value + items[u->level].value;
if (u->weight <= K && u->value > maxvalue)
maxvalue = u->value;
u->bound = bound(n, K, items, u);
if (u->bound > maxvalue)
pqueue_enqueue(pq, (void *) u);
else free(u);
/* Set u to be child that does not include next item */
u = malloc(sizeof(Node));
if (!u) allocation_error();
u->level = v->level + 1;
u->weight = v->weight;
u->value = v->value;
u->bound = bound(n, K, items, u);
if (u->bound > maxvalue)
pqueue_enqueue(pq, (void *) u);
else free(u);
free(v);
}
}
pqueue_free(pq);
sprintf(sol, "%d\n", maxvalue);
return sol;
}
END_TEST
START_TEST(test_pqueue_dequeue)
{
PriorityQueue *pq = pqueue_new();
ck_assert_msg(pq != NULL, "Priority queue should not be NULL.");
TreeNode *t = tree_new();
t->type = LEAF;
t->freq.v = 10;
t->freq.c = 'c';
t->left = NULL;
t->right = NULL;
pqueue_enqueue(pq, t);
ck_assert_int_eq(pqueue_size(pq), 1);
t = tree_new();
t->type = LEAF;
t->freq.v = 15;
t->freq.c = 'x';
t->left = NULL;
t->right = NULL;
pqueue_enqueue(pq, t);
ck_assert_int_eq(pqueue_size(pq), 2);
t = tree_new();
t->type = LEAF;
t->freq.v = 9;
t->freq.c = 'q';
t->left = NULL;
t->right = NULL;
pqueue_enqueue(pq, t);
ck_assert_int_eq(pqueue_size(pq), 3);
t = tree_new();
t->type = LEAF;
t->freq.v = 999;
t->freq.c = 'a';
t->left = NULL;
t->right = NULL;
pqueue_enqueue(pq, t);
ck_assert_int_eq(pqueue_size(pq), 4);
t = pqueue_dequeue(pq);
ck_assert_int_eq(t->freq.c, 'q');
ck_assert_int_eq(pqueue_size(pq), 3);
free(t);
t = pqueue_dequeue(pq);
ck_assert_int_eq(t->freq.c, 'c');
ck_assert_int_eq(pqueue_size(pq), 2);
free(t);
t = pqueue_dequeue(pq);
ck_assert_int_eq(t->freq.c, 'x');
ck_assert_int_eq(pqueue_size(pq), 1);
free(t);
t = pqueue_dequeue(pq);
ck_assert_int_eq(t->freq.c, 'a');
ck_assert_int_eq(pqueue_size(pq), 0);
free(t);
pqueue_free(pq);
}
int main(){
setup();
puts("5-item enqueue");
pqueue_enqueue(pq, u[5]);
puts("");
puts("PriorityQueue: ");
for(int i=0; i<pqueue_len(pq); i++){
print(pq->nodes[i]);
}
puts("");
puts("9-item enqueue");
pqueue_enqueue(pq, u[9]);
puts("");
puts("PriorityQueue: ");
for(int i=0; i<pqueue_len(pq); i++){
print(pq->nodes[i]);
}
puts("");
puts("3-item enqueue");
pqueue_enqueue(pq, u[3]);
puts("");
puts("PriorityQueue: ");
for(int i=0; i<pqueue_len(pq); i++){
print(pq->nodes[i]);
}
puts("");
puts("0-item enqueue");
pqueue_enqueue(pq, u[0]);
puts("");
puts("PriorityQueue: ");
for(int i=0; i<pqueue_len(pq); i++){
print(pq->nodes[i]);
}
puts("");
puts("8-item enqueue");
pqueue_enqueue(pq, u[8]);
puts("");
puts("PriorityQueue: ");
for(int i=0; i<pqueue_len(pq); i++){
print(pq->nodes[i]);
}
puts("");
void *data = NULL;
puts("dequeue");
pqueue_dequeue(pq, &data);
print(data);
puts("");
puts("PriorityQueue: ");
for(int i=0; i<pqueue_len(pq); i++){
print(pq->nodes[i]);
}
puts("");
puts("dequeue");
pqueue_dequeue(pq, &data);
print(data);
puts("");
puts("PriorityQueue: ");
for(int i=0; i<pqueue_len(pq); i++){
print(pq->nodes[i]);
}
puts("");
puts("6-item enqueue");
pqueue_enqueue(pq, u[6]);
puts("");
puts("PriorityQueue: ");
for(int i=0; i<pqueue_len(pq); i++){
print(pq->nodes[i]);
}
puts("");
enddown();
return 0;
}
graph_t kruskal(graph_t graph) {
/* Computes a MST of the given graph.
*
* This function returns a copy of the input graph in which
* only the edges of the MST are marked as primary. The
* remaining edges are marked as secondary.
*
* The input graph does not change.
*
*/
graph_t mst;
union_find_t uf;
pqueue_t pq;
edge_t *edges;
edge_t e;
unsigned int left, right, n, m;
/* Inicialización */
n = graph_vertices_count(graph);
m = graph_edges_count(graph);
mst = graph_empty(n);
uf = union_find_create(n);
pq = pqueue_empty(m);
/* Llenar `pq` */
edges = graph_edges(graph);
for (unsigned int j = 0; j < m; j++) {
pqueue_enqueue(pq, edges[j]);
}
/* Ahora las aristas están en `pq` */
free(edges);
edges = NULL;
/* Principal */
while (!pqueue_is_empty(pq) && union_find_count(uf) > 1) {
e = edge_copy(pqueue_fst(pq));
left = vertex_label(edge_left_vertex(e));
right = vertex_label(edge_right_vertex(e));
left = union_find_find(uf, left);
right = union_find_find(uf, right);
if (!union_find_connected(uf, left, right)) {
e = edge_set_primary(e, true);
union_find_union(uf, left, right);
} else {
e = edge_set_primary(e, false);
}
mst = graph_add_edge(mst, e);
pqueue_dequeue(pq);
}
/* Agregar aristas restantes como secundarias */
while (!pqueue_is_empty(pq)) {
e = edge_copy(pqueue_fst(pq));
e = edge_set_primary(e, false);
mst = graph_add_edge(mst, e);
pqueue_dequeue(pq);
}
/* Destroy */
uf = union_find_destroy(uf);
pq = pqueue_destroy(pq);
return (mst);
}
/* RFC2740 3.8.1. Calculating the shortest path tree for an area */
void ospf6_spf_calculation(u_int32_t router_id,
struct ospf6_route_table * result_table,
struct ospf6_area * oa, unsigned int hostnum)
{
struct pqueue * candidate_list;
struct ospf6_vertex * root, * v, * w;
int i;
int size;
caddr_t lsdesc;
struct ospf6_lsa * lsa;
if(IS_OSPF6_SIBLING_DEBUG_SPF)
{
zlog_debug("Starting spf calculation...");
}
/* initialize */
candidate_list = pqueue_create();
candidate_list->cmp = ospf6_vertex_cmp;
ospf6_spf_table_finish (result_table);
/* Install the calculating router itself as the root of the SPF tree */
/* construct root vertex */
lsa = ospf6_lsdb_lookup (htons (OSPF6_LSTYPE_ROUTER), htonl (0),
router_id, oa->lsdb);
if (lsa == NULL)
{
if(IS_OSPF6_SIBLING_DEBUG_SPF)
{
zlog_debug("Looking for type %d from lsdb %p with router id %d", htons(OSPF6_LSTYPE_ROUTER), oa->lsdb, router_id);
zlog_debug("No router LSAs present, quiting spf calculation");
}
return;
}
root = ospf6_vertex_create (lsa);
root->area = oa;
root->cost = 0;
root->hops = 0;
root->nexthop[0].ifindex = 0; /* loopbak I/F is better ... */
inet_pton (AF_INET6, "::1", &root->nexthop[0].address);
/* Actually insert root to the candidate-list as the only candidate */
pqueue_enqueue (root, candidate_list);
/* Iterate until candidate-list becomes empty */
while (candidate_list->size)
{
/* get closest candidate from priority queue */
v = pqueue_dequeue (candidate_list);
/* installing may result in merging or rejecting of the vertex */
if (ospf6_spf_install (v, result_table, hostnum) < 0)
continue;
/* For each LS description in the just-added vertex V's LSA */
size = (VERTEX_IS_TYPE (ROUTER, v) ?
sizeof (struct ospf6_router_lsdesc) :
sizeof (struct ospf6_network_lsdesc));
for (lsdesc = OSPF6_LSA_HEADER_END (v->lsa->header) + 4;
lsdesc + size <= OSPF6_LSA_END (v->lsa->header); lsdesc += size)
{
lsa = ospf6_lsdesc_lsa (lsdesc, v);
if (lsa == NULL)
continue;
if (! ospf6_lsdesc_backlink (lsa, lsdesc, v))
continue;
w = ospf6_vertex_create (lsa);
w->area = oa;
w->parent = v;
if (VERTEX_IS_TYPE (ROUTER, v))
{
w->cost = v->cost + ROUTER_LSDESC_GET_METRIC (lsdesc);
w->hops = v->hops + (VERTEX_IS_TYPE (NETWORK, w) ? 0 : 1);
}
else /* NETWORK */
{
w->cost = v->cost;
w->hops = v->hops + 1;
}
/* nexthop calculation */
if (w->hops == 0)
w->nexthop[0].ifindex = ROUTER_LSDESC_GET_IFID (lsdesc);
else if (w->hops == 1 && v->hops == 0)
ospf6_nexthop_calc (w, v, lsdesc);
else
{
for (i = 0; ospf6_nexthop_is_set (&v->nexthop[i]) &&
i < OSPF6_MULTI_PATH_LIMIT; i++)
ospf6_nexthop_copy (&w->nexthop[i], &v->nexthop[i]);
}
/* add new candidate to the candidate_list */
if (IS_OSPF6_SIBLING_DEBUG_SPF)
zlog_debug (" New candidate: %s hops %d cost %d",
w->name, w->hops, w->cost);
pqueue_enqueue (w, candidate_list);
}
}
pqueue_delete (candidate_list);
}