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psyced/world/net/queue.c

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// $Id: queue.c,v 1.19 2008/03/29 20:05:32 lynx Exp $ // vim:syntax=lpc
//
// the *better* queue
#include <net.h>
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#define Q_TOP 0
#define Q_BOTTOM 1
#define Q_SIZE 2
#define Q_MAX 3
#define Q_WIDTH 4
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//#define I_PRE 0
#ifdef I_PRE
# define I_DATA 1
# define I_NEXT 2
#else
# define I_DATA 0
# define I_NEXT 1
#endif
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volatile mapping q;
mapping qDebug() { return q; }
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static varargs int qInit(mixed name, int max, int stinkt) {
if (member(q, name)) return 0;
q[name, Q_MAX] = max;
return 1;
}
static int enqueue(mixed name, mixed item) {
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mixed *a, *n;
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P4(("queue:enqueue(%O.. in %O from %O\n",
name, ME, previous_object()))
if (q[name, Q_MAX] && (q[name, Q_SIZE] == q[name, Q_MAX])) {
P1(("queue %O has reached maximum size (enqueue(%O))\n", name, item))
return 0;
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}
#ifdef I_PRE
n = allocate(3);
#else
n = allocate(2);
#endif
n[I_DATA] = item;
if (a = q[name, Q_BOTTOM]) {
#ifdef I_PRE
n[I_PRE] = a;
#endif
q[name, Q_BOTTOM] = a[I_NEXT] = n;
} else
q[name, Q_BOTTOM] = q[name, Q_TOP] = n;
q[name, Q_SIZE]++;
return 1;
}
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static mixed qExists(varargs mixed *names) {
foreach(mixed name : names)
if (member(q, name)) return name;
return 0;
}
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static mixed qSize(varargs mixed *names) {
if (sizeof(names) == 1) {
return q[names[0], Q_SIZE];
}
foreach (mixed name : names)
if (q[name, Q_SIZE]) return name;
return 0;
}
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static int qRename(mixed old, mixed new) {
if (!member(q, old) || member(q, new)) return 0;
q += ([ new : q[old, Q_TOP]; q[old, Q_BOTTOM]; q[old, Q_SIZE];
q[old, Q_MAX] ]);
m_delete(q, old);
return 1;
}
static mixed shift(mixed name) {
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mixed *a
#ifdef I_PRE
, *b
#endif
;
if (a = q[name, Q_TOP]) {
if (a[I_NEXT]) {
#ifdef I_PRE
q[name, Q_TOP] = b = a[I_NEXT];
b[I_PRE] = 0;
#else
q[name, Q_TOP] = a[I_NEXT];
#endif
} else
q[name, Q_TOP] = q[name, Q_BOTTOM] = 0;
q[name, Q_SIZE]--;
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return a[I_DATA];
}
return 0;
}
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static int unshift(mixed name, mixed item) {
mixed *a, *n;
if (q[name, Q_MAX] && (q[name, Q_SIZE] == q[name, Q_MAX])) {
P1(("queue %O has maximum size (unshift(%O))\n", name, item))
return 0;
}
#ifdef I_PRE
n = allocate(3);
#else
n = allocate(2);
#endif
n[I_DATA] = item;
if (a = q[name, Q_TOP]) {
n[I_NEXT] = a;
#ifdef I_PRE
q[name, Q_TOP] = a[I_PRE] = n;
#else
q[name, Q_TOP] = n;
#endif
} else
q[name, Q_TOP] = q[name, Q_BOTTOM] = n;
q[name, Q_SIZE]++;
return 1;
}
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static int qDel(mixed name) {
ASSERT("qDel (mappingp(q))", mappingp(q), q)
m_delete(q, name);
return 1;
}
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static mapping qCreate() {
unless (mappingp(q) && widthof(q) == Q_WIDTH) q = m_allocate(0, Q_WIDTH);
P3(("qCreate in %O produces %O (%O)\n", ME, q, widthof(q)))
return q;
}
static mixed *qToArray(mixed name) {
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mixed *tmp, *cur;
int max;
ASSERT("qToArray (mappingp(q))", mappingp(q), q)
unless (member(q, name)) return 0;
tmp = allocate(max = q[name, Q_SIZE]);
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cur = q[name];
for (int i = 0; i < max; i++) {
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tmp[i] = cur[I_DATA];
cur = cur[I_NEXT];
}
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return tmp;
}