int get_parcel(PQueue *parcels, Parcel *parcel)
{
Parcel *data;
if (pqueue_size(parcels) == 0)
{
/* Return that there are no parcels. */
return -1;
}
else
{
if (pqueue_extract(parcels, (void **)data) != 0)
{
/* Return that a parcel could not be retrieved. */
return -1;
}
else
{
/* Pass back the highest-priority parcel. */
memcpy(parcel, data, sizeof(Parcel));
free(data);
}
}
return 0;
}
/*
** Load the record ID rid and up to N-1 closest descendants into
** the "ok" table.
*/
void compute_descendants(int rid, int N) {
Bag seen;
PQueue queue;
Stmt ins;
Stmt q;
bag_init(&seen);
pqueue_init(&queue);
bag_insert(&seen, rid);
pqueue_insert(&queue, rid, 0.0, 0);
db_prepare(&ins, "INSERT OR IGNORE INTO ok VALUES(:rid)");
db_prepare(&q, "SELECT cid, mtime FROM plink WHERE pid=:rid");
while( (N--)>0 && (rid = pqueue_extract(&queue, 0))!=0 ) {
db_bind_int(&ins, ":rid", rid);
db_step(&ins);
db_reset(&ins);
db_bind_int(&q, ":rid", rid);
while( db_step(&q)==SQLITE_ROW ) {
int pid = db_column_int(&q, 0);
double mtime = db_column_double(&q, 1);
if( bag_insert(&seen, pid) ) {
pqueue_insert(&queue, pid, mtime, 0);
}
}
db_reset(&q);
}
bag_clear(&seen);
pqueue_clear(&queue);
db_finalize(&ins);
db_finalize(&q);
}
static int build_tree(int *freqs, BiTree **tree) {
BiTree *init,
*merge,
*left,
*right;
PQueue pqueue;
HuffNode *data;
int size,
c;
/*****************************************************************************
* *
* Initialize the priority queue of binary trees. *
* *
*****************************************************************************/
*tree = NULL;
pqueue_init(&pqueue, compare_freq, destroy_tree);
for (c = 0; c <= UCHAR_MAX; c++) {
if (freqs[c] != 0) {
/***********************************************************************
* *
* Set up a binary tree for the current symbol and its frequency. *
* *
***********************************************************************/
if ((init = (BiTree *)malloc(sizeof(BiTree))) == NULL) {
pqueue_destroy(&pqueue);
return -1;
}
bitree_init(init, free);
if ((data = (HuffNode *)malloc(sizeof(HuffNode))) == NULL) {
pqueue_destroy(&pqueue);
return -1;
}
data->symbol = c;
data->freq = freqs[c];
if (bitree_ins_left(init, NULL, data) != 0) {
free(data);
bitree_destroy(init);
free(init);
pqueue_destroy(&pqueue);
return -1;
}
/***********************************************************************
* *
* Insert the binary tree into the priority queue. *
* *
***********************************************************************/
if (pqueue_insert(&pqueue, init) != 0) {
bitree_destroy(init);
free(init);
pqueue_destroy(&pqueue);
return -1;
}
}
}
/*****************************************************************************
* *
* Build a Huffman tree by merging trees in the priority queue. *
* *
*****************************************************************************/
size = pqueue_size(&pqueue);
for (c = 1; c <= size - 1; c++) {
/**************************************************************************
* *
* Allocate storage for the next merged tree. *
* *
**************************************************************************/
if ((merge = (BiTree *)malloc(sizeof(BiTree))) == NULL) {
pqueue_destroy(&pqueue);
return -1;
}
/**************************************************************************
* *
* Extract the two trees whose root nodes have the smallest frequencies. *
* *
**************************************************************************/
if (pqueue_extract(&pqueue, (void **)&left) != 0) {
pqueue_destroy(&pqueue);
free(merge);
return -1;
}
if (pqueue_extract(&pqueue, (void **)&right) != 0) {
pqueue_destroy(&pqueue);
free(merge);
return -1;
}
/**************************************************************************
* *
* Allocate storage for the data in the root node of the merged tree. *
* *
**************************************************************************/
if ((data = (HuffNode *)malloc(sizeof(HuffNode))) == NULL) {
pqueue_destroy(&pqueue);
free(merge);
return -1;
}
memset(data, 0, sizeof(HuffNode));
/**************************************************************************
* *
* Sum the frequencies in the root nodes of the trees being merged. *
* *
**************************************************************************/
data->freq = ((HuffNode *)bitree_data(bitree_root(left)))->freq +
((HuffNode *)bitree_data(bitree_root(right)))->freq;
/**************************************************************************
* *
* Merge the two trees. *
* *
**************************************************************************/
if (bitree_merge(merge, left, right, data) != 0) {
pqueue_destroy(&pqueue);
free(merge);
return -1;
}
/**************************************************************************
* *
* Insert the merged tree into the priority queue and free the others. *
* *
**************************************************************************/
if (pqueue_insert(&pqueue, merge) != 0) {
pqueue_destroy(&pqueue);
bitree_destroy(merge);
free(merge);
return -1;
}
free(left);
free(right);
}
/*****************************************************************************
* *
* The last tree in the priority queue is the Huffman tree. *
* *
*****************************************************************************/
if (pqueue_extract(&pqueue, (void **)tree) != 0) {
pqueue_destroy(&pqueue);
return -1;
}
else {
pqueue_destroy(&pqueue);
}
return 0;
}
int fastmarch(float *time /* time */,
float *source /* source */,
int *list /* list */,
int *mask /* recv */,
float *data /* reco */,
float *rhs /* rhs */,
upgrad upg /* stencil */)
/*< run fast marching eikonal solver >*/
{
int its;
float xs[3], *p;
int npoints, i, j, k, count, length;
#ifdef _OPENMP
its = omp_get_thread_num();
#else
its = 0;
#endif
/* point t to time for pqueue operations */
t[its] = time;
/* source distance from origin */
xs[0] = source[0]-o[0];
xs[1] = source[1]-o[1];
xs[2] = source[2]-o[2];
/* initialize priority queue */
xn[its] = x[its];
x1[its] = x[its]+1;
count = 0;
length = 0;
/* fast marching */
for (npoints = neighbors_nearsource(time,xs);
npoints > 0;
npoints -= neighbours(time,i)) {
/* smallest value in queue */
p = pqueue_extract();
if (p == NULL) {
sf_warning("%s: shot (%g,%g,%g) heap exausted!",__FILE__,source[0],source[1],source[2]);
break;
}
i = p-time;
/* update wave front */
in[its][i] = SF_IN;
/* update stencil */
upgrad_set(upg,time,i,in[its],length);
length++;
/* update rhs */
k = list[0];
for (j=0; j < list[1]; j++) {
if (i == mask[j]) {
rhs[k+j] = data[j]-time[i];
count++;
break;
}
}
/* break for limited acquisition */
if (count == list[1]) break;
}
return(length);
}
int main(int argc, char **argv) {
PQueue pqueue;
void *data;
int intval[30],
i;
/*****************************************************************************
* *
* Initialize the priority queue. *
* *
*****************************************************************************/
pqueue_init(&pqueue, compare_int, NULL);
/*****************************************************************************
* *
* Perform some priority queue operations. *
* *
*****************************************************************************/
i = 0;
intval[i] = 5;
fprintf(stdout, "Inserting %03d\n", intval[i]);
if (pqueue_insert(&pqueue, &intval[i]) != 0)
return 1;
print_pqueue(&pqueue);
i++;
intval[i] = 10;
fprintf(stdout, "Inserting %03d\n", intval[i]);
if (pqueue_insert(&pqueue, &intval[i]) != 0)
return 1;
print_pqueue(&pqueue);
i++;
intval[i] = 20;
fprintf(stdout, "Inserting %03d\n", intval[i]);
if (pqueue_insert(&pqueue, &intval[i]) != 0)
return 1;
print_pqueue(&pqueue);
i++;
intval[i] = 1;
fprintf(stdout, "Inserting %03d\n", intval[i]);
if (pqueue_insert(&pqueue, &intval[i]) != 0)
return 1;
print_pqueue(&pqueue);
i++;
intval[i] = 25;
fprintf(stdout, "Inserting %03d\n", intval[i]);
if (pqueue_insert(&pqueue, &intval[i]) != 0)
return 1;
print_pqueue(&pqueue);
i++;
intval[i] = 22;
fprintf(stdout, "Inserting %03d\n", intval[i]);
if (pqueue_insert(&pqueue, &intval[i]) != 0)
return 1;
print_pqueue(&pqueue);
i++;
intval[i] = 12;
fprintf(stdout, "Inserting %03d\n", intval[i]);
if (pqueue_insert(&pqueue, &intval[i]) != 0)
return 1;
print_pqueue(&pqueue);
i++;
while (pqueue_size(&pqueue) > 0) {
fprintf(stdout, "Peeking at the highest priority element..Value=%03d\n",
*(int *)pqueue_peek(&pqueue));
if (pqueue_extract(&pqueue, (void **)&data) != 0)
return 1;
fprintf(stdout, "Extracting %03d\n", *(int *)data);
print_pqueue(&pqueue);
}
/*****************************************************************************
* *
* Destroy the priority queue. *
* *
*****************************************************************************/
fprintf(stdout, "Destroying the pqueue\n");
pqueue_destroy(&pqueue);
return 0;
}
/*
** Propagate the tag given by tagid to the children of pid.
**
** This routine assumes that tagid is a tag that should be
** propagated and that the tag is already present in pid.
**
** If tagtype is 2 then the tag is being propagated from an
** ancestor node. If tagtype is 0 it means a propagating tag is
** being blocked.
*/
static void tag_propagate(
int pid, /* Propagate the tag to children of this node */
int tagid, /* Tag to propagate */
int tagType, /* 2 for a propagating tag. 0 for an antitag */
int origId, /* Artifact of tag, when tagType==2 */
const char *zValue, /* Value of the tag. Might be NULL */
double mtime /* Timestamp on the tag */
){
PQueue queue; /* Queue of check-ins to be tagged */
Stmt s; /* Query the children of :pid to which to propagate */
Stmt ins; /* INSERT INTO tagxref */
Stmt eventupdate; /* UPDATE event */
assert( tagType==0 || tagType==2 );
pqueue_init(&queue);
pqueue_insert(&queue, pid, 0.0, 0);
/* Query for children of :pid to which to propagate the tag.
** Three returns: (1) rid of the child. (2) timestamp of child.
** (3) True to propagate or false to block.
*/
db_prepare(&s,
"SELECT cid, plink.mtime,"
" coalesce(srcid=0 AND tagxref.mtime<:mtime, %d) AS doit"
" FROM plink LEFT JOIN tagxref ON cid=rid AND tagid=%d"
" WHERE pid=:pid AND isprim",
tagType==2, tagid
);
db_bind_double(&s, ":mtime", mtime);
if( tagType==2 ){
/* Set the propagated tag marker on checkin :rid */
db_prepare(&ins,
"REPLACE INTO tagxref(tagid, tagtype, srcid, origid, value, mtime, rid)"
"VALUES(%d,2,0,%d,%Q,:mtime,:rid)",
tagid, origId, zValue
);
db_bind_double(&ins, ":mtime", mtime);
}else{
/* Remove all references to the tag from checkin :rid */
zValue = 0;
db_prepare(&ins,
"DELETE FROM tagxref WHERE tagid=%d AND rid=:rid", tagid
);
}
if( tagid==TAG_BGCOLOR ){
db_prepare(&eventupdate,
"UPDATE event SET bgcolor=%Q WHERE objid=:rid", zValue
);
}
while( (pid = pqueue_extract(&queue, 0))!=0 ){
db_bind_int(&s, ":pid", pid);
while( db_step(&s)==SQLITE_ROW ){
int doit = db_column_int(&s, 2);
if( doit ){
int cid = db_column_int(&s, 0);
double mtime = db_column_double(&s, 1);
pqueue_insert(&queue, cid, mtime, 0);
db_bind_int(&ins, ":rid", cid);
db_step(&ins);
db_reset(&ins);
if( tagid==TAG_BGCOLOR ){
db_bind_int(&eventupdate, ":rid", cid);
db_step(&eventupdate);
db_reset(&eventupdate);
}
if( tagid==TAG_BRANCH ){
leaf_eventually_check(cid);
}
}
}
db_reset(&s);
}
pqueue_clear(&queue);
db_finalize(&ins);
db_finalize(&s);
if( tagid==TAG_BGCOLOR ){
db_finalize(&eventupdate);
}
}
